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net.bytebuddy.build.Plugin Maven / Gradle / Ivy
/*
* Copyright 2014 - Present Rafael Winterhalter
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.bytebuddy.build;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.ClassFileVersion;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.ClassFileLocator;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.dynamic.TypeResolutionStrategy;
import net.bytebuddy.dynamic.scaffold.inline.MethodNameTransformer;
import net.bytebuddy.implementation.LoadedTypeInitializer;
import net.bytebuddy.matcher.ElementMatcher;
import net.bytebuddy.pool.TypePool;
import net.bytebuddy.utility.CompoundList;
import net.bytebuddy.utility.FileSystem;
import net.bytebuddy.utility.StreamDrainer;
import net.bytebuddy.utility.nullability.AlwaysNull;
import net.bytebuddy.utility.nullability.MaybeNull;
import java.io.*;
import java.lang.annotation.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.URL;
import java.util.*;
import java.util.concurrent.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import static net.bytebuddy.matcher.ElementMatchers.none;
/**
*
* A plugin that allows for the application of Byte Buddy transformations during a build process. This plugin's
* transformation is applied to any type matching this plugin's type matcher. Plugin types must be public,
* non-abstract and must declare a public default constructor to work.
*
*
* A plugin is always used within the scope of a single plugin engine application and is disposed after closing. It might be used
* concurrently and must assure its own thread-safety if run outside of a {@link Plugin.Engine} or when using a parallel
* {@link Plugin.Engine.Dispatcher}.
*
*
* For discoverability, plugin class names can be stored in a file named META-INF/net.bytebuddy/build.plugins with the fully
* qualified class name of the plugin per line.
*
*/
public interface Plugin extends ElementMatcher, Closeable {
/**
* Applies this plugin.
*
* @param builder The builder to use as a basis for the applied transformation.
* @param typeDescription The type being transformed.
* @param classFileLocator A class file locator that can locate other types in the scope of the project.
* @return The supplied builder with additional transformations registered.
*/
DynamicType.Builder apply(DynamicType.Builder builder, TypeDescription typeDescription, ClassFileLocator classFileLocator);
/**
*
* A plugin that applies a preprocessor, i.e. causes a plugin engine's execution to defer all plugin applications until all types were discovered.
*
*
* Important : The registration of a single plugin with preprocessor causes the deferral of all plugins' application that are registered
* with a particular plugin engine. This will reduce parallel application if a corresponding {@link Engine.Dispatcher} is used and will increase
* the engine application's memory consumption. Any alternative application of a plugin outside of a {@link Plugin.Engine} might not be capable
* of preprocessing where the discovery callback is not invoked.
*
*/
interface WithPreprocessor extends Plugin {
/**
* Invoked upon the discovery of a type that is not explicitly ignored.
*
* @param typeDescription The discovered type.
* @param classFileLocator A class file locator that can locate other types in the scope of the project.
*/
void onPreprocess(TypeDescription typeDescription, ClassFileLocator classFileLocator);
}
/**
* Allows for the generation of types before a plugin is applied.
*/
interface WithInitialization extends Plugin {
/**
* Returns a mapping of classes that should be created before discovering any types.
*
* @param classFileLocator A class file locator that can locate other types in the scope of the project.
* @return A mapping of types to their binary representation.
*/
Map initialize(ClassFileLocator classFileLocator);
}
/**
* A factory for providing a build plugin.
*/
interface Factory {
/**
* Returns a plugin that can be used for a transformation and which is subsequently closed.
*
* @return The plugin to use for type transformations.
*/
Plugin make();
/**
* A simple factory that returns a preconstructed plugin instance.
*/
@HashCodeAndEqualsPlugin.Enhance
class Simple implements Factory {
/**
* The plugin to provide.
*/
private final Plugin plugin;
/**
* Creates a simple plugin factory.
*
* @param plugin The plugin to provide.
*/
public Simple(Plugin plugin) {
this.plugin = plugin;
}
/**
* {@inheritDoc}
*/
public Plugin make() {
return plugin;
}
}
/**
* A plugin factory that uses reflection for instantiating a plugin.
*/
@HashCodeAndEqualsPlugin.Enhance
class UsingReflection implements Factory {
/**
* The plugin type.
*/
private final Class type;
/**
* A list of argument providers that can be used for instantiating the plugin.
*/
private final List argumentResolvers;
/**
* Creates a plugin factory that uses reflection for creating a plugin.
*
* @param type The plugin type.
*/
public UsingReflection(Class type) {
this(type, Collections.emptyList());
}
/**
* Creates a plugin factory that uses reflection for creating a plugin.
*
* @param type The plugin type.
* @param argumentResolvers A list of argument providers that can be used for instantiating the plugin.
*/
protected UsingReflection(Class type, List argumentResolvers) {
this.type = type;
this.argumentResolvers = argumentResolvers;
}
/**
* Appends the supplied argument resolvers.
*
* @param argumentResolver A list of argument providers that can be used for instantiating the plugin.
* @return A new plugin factory that uses reflection for creating a plugin that also uses the supplied argument resolvers.
*/
public UsingReflection with(ArgumentResolver... argumentResolver) {
return with(Arrays.asList(argumentResolver));
}
/**
* Appends the supplied argument resolvers.
*
* @param argumentResolvers A list of argument providers that can be used for instantiating the plugin.
* @return A new plugin factory that uses reflection for creating a plugin that also uses the supplied argument resolvers.
*/
public UsingReflection with(List argumentResolvers) {
return new UsingReflection(type, CompoundList.of(argumentResolvers, this.argumentResolvers));
}
/**
* {@inheritDoc}
*/
@SuppressWarnings("unchecked")
public Plugin make() {
Instantiator instantiator = new Instantiator.Unresolved(type);
candidates:
for (Constructor constructor : type.getConstructors()) {
if (!constructor.isSynthetic()) {
List arguments = new ArrayList(constructor.getParameterTypes().length);
int index = 0;
for (Class type : constructor.getParameterTypes()) {
boolean resolved = false;
for (ArgumentResolver argumentResolver : argumentResolvers) {
ArgumentResolver.Resolution resolution = argumentResolver.resolve(index, type);
if (resolution.isResolved()) {
arguments.add(resolution.getArgument());
resolved = true;
break;
}
}
if (resolved) {
index += 1;
} else {
continue candidates;
}
}
instantiator = instantiator.replaceBy(new Instantiator.Resolved((Constructor) constructor, arguments));
}
}
return instantiator.instantiate();
}
/**
* An instantiator is responsible for invoking a plugin constructor reflectively.
*/
protected interface Instantiator {
/**
* Returns either this instantiator or the supplied instantiator, depending on the instances' states.
*
* @param instantiator The alternative instantiator.
* @return The dominant instantiator.
*/
Instantiator replaceBy(Resolved instantiator);
/**
* Instantiates the represented plugin.
*
* @return The instantiated plugin.
*/
Plugin instantiate();
/**
* An instantiator that is not resolved for creating an instance.
*/
@HashCodeAndEqualsPlugin.Enhance
class Unresolved implements Instantiator {
/**
* The type for which no constructor was yet resolved.
*/
private final Class type;
/**
* Creates a new unresolved constructor.
*
* @param type The type for which no constructor was yet resolved.
*/
protected Unresolved(Class type) {
this.type = type;
}
/**
* {@inheritDoc}
*/
public Instantiator replaceBy(Resolved instantiator) {
return instantiator;
}
/**
* {@inheritDoc}
*/
public Plugin instantiate() {
throw new IllegalStateException("No constructor resolvable for " + type);
}
}
/**
* Represents an ambiguously resolved instantiator.
*/
@HashCodeAndEqualsPlugin.Enhance
class Ambiguous implements Instantiator {
/**
* The left constructor.
*/
private final Constructor left;
/**
* The right constructor.
*/
private final Constructor right;
/**
* The resolved priority.
*/
private final int priority;
/**
* The resolved number of parameters.
*/
private final int parameters;
/**
* Creates a new ambiguous instantiator.
*
* @param left The left constructor.
* @param right The right constructor.
* @param priority The resolved priority.
* @param parameters The resolved number of parameters.
*/
protected Ambiguous(Constructor left, Constructor right, int priority, int parameters) {
this.left = left;
this.right = right;
this.priority = priority;
this.parameters = parameters;
}
/**
* {@inheritDoc}
*/
public Instantiator replaceBy(Resolved instantiator) {
Priority priority = instantiator.getConstructor().getAnnotation(Priority.class);
if ((priority == null ? Priority.DEFAULT : priority.value()) > this.priority) {
return instantiator;
} else if ((priority == null ? Priority.DEFAULT : priority.value()) < this.priority) {
return this;
} else if (instantiator.getConstructor().getParameterTypes().length > parameters) {
return instantiator;
} else {
return this;
}
}
/**
* {@inheritDoc}
*/
public Plugin instantiate() {
throw new IllegalStateException("Ambiguous constructors " + left + " and " + right);
}
}
/**
* An instantiator that is resolved for a given constructor with arguments.
*/
@HashCodeAndEqualsPlugin.Enhance
class Resolved implements Instantiator {
/**
* The represented constructor.
*/
private final Constructor constructor;
/**
* The constructor arguments.
*/
private final List arguments;
/**
* Creates a new resolved constructor.
*
* @param constructor The represented constructor.
* @param arguments The constructor arguments.
*/
protected Resolved(Constructor constructor, List arguments) {
this.constructor = constructor;
this.arguments = arguments;
}
/**
* Returns the resolved constructor.
*
* @return The resolved constructor.
*/
protected Constructor getConstructor() {
return constructor;
}
/**
* {@inheritDoc}
*/
public Instantiator replaceBy(Resolved instantiator) {
Priority left = constructor.getAnnotation(Priority.class), right = instantiator.getConstructor().getAnnotation(Priority.class);
int leftPriority = left == null ? Priority.DEFAULT : left.value(), rightPriority = right == null ? Priority.DEFAULT : right.value();
if (leftPriority > rightPriority) {
return this;
} else if (leftPriority < rightPriority) {
return instantiator;
} else if (constructor.getParameterTypes().length > instantiator.getConstructor().getParameterTypes().length) {
return this;
} else if (constructor.getParameterTypes().length < instantiator.getConstructor().getParameterTypes().length) {
return instantiator;
} else {
return new Ambiguous(constructor, instantiator.getConstructor(), leftPriority, constructor.getParameterTypes().length);
}
}
/**
* {@inheritDoc}
*/
public Plugin instantiate() {
try {
return constructor.newInstance(arguments.toArray(new Object[0]));
} catch (InstantiationException exception) {
throw new IllegalStateException("Failed to instantiate plugin via " + constructor, exception);
} catch (IllegalAccessException exception) {
throw new IllegalStateException("Failed to access " + constructor, exception);
} catch (InvocationTargetException exception) {
throw new IllegalStateException("Error during construction of" + constructor, exception.getTargetException());
}
}
}
}
/**
* Indicates that a constructor should be treated with a given priority if several constructors can be resolved.
*/
@Documented
@Target(ElementType.CONSTRUCTOR)
@Retention(RetentionPolicy.RUNTIME)
public @interface Priority {
/**
* The default priority that is assumed for non-annotated constructors.
*/
int DEFAULT = 0;
/**
* Indicates the priority of the annotated constructor.
*
* @return The priority of the annotated constructor.
*/
int value();
}
/**
* Allows to resolve arguments for a {@link Plugin} constructor.
*/
public interface ArgumentResolver {
/**
* Attempts the resolution of an argument for a given parameter.
*
* @param index The parameter's index.
* @param type The parameter's type.
* @return The resolution for the parameter.
*/
Resolution resolve(int index, Class type);
/**
* A resolution provided by an argument provider.
*/
interface Resolution {
/**
* Returns {@code true} if the represented argument is resolved successfully.
*
* @return {@code true} if the represented argument is resolved successfully.
*/
boolean isResolved();
/**
* Returns the resolved argument if the resolution was successful.
*
* @return The resolved argument if the resolution was successful.
*/
@MaybeNull
Object getArgument();
/**
* Represents an unresolved argument resolution.
*/
enum Unresolved implements Resolution {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public boolean isResolved() {
return false;
}
/**
* {@inheritDoc}
*/
public Object getArgument() {
throw new IllegalStateException("Cannot get the argument for an unresolved parameter");
}
}
/**
* Represents a resolved argument resolution.
*/
@HashCodeAndEqualsPlugin.Enhance
class Resolved implements Resolution {
/**
* The resolved argument which might be {@code null}.
*/
@MaybeNull
@HashCodeAndEqualsPlugin.ValueHandling(HashCodeAndEqualsPlugin.ValueHandling.Sort.REVERSE_NULLABILITY)
private final Object argument;
/**
* Creates a resolved argument resolution.
*
* @param argument The resolved argument which might be {@code null}.
*/
public Resolved(@MaybeNull Object argument) {
this.argument = argument;
}
/**
* {@inheritDoc}
*/
public boolean isResolved() {
return true;
}
/**
* {@inheritDoc}
*/
@MaybeNull
public Object getArgument() {
return argument;
}
}
}
/**
* An argument resolver that never resolves an argument.
*/
enum NoOp implements ArgumentResolver {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public Resolution resolve(int index, Class type) {
return Resolution.Unresolved.INSTANCE;
}
}
/**
* An argument resolver that resolves parameters for a given type.
*
* @param The type being resolved.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForType implements ArgumentResolver {
/**
* The type being resolved.
*/
private final Class type;
/**
* The instance to resolve for the represented type.
*/
private final T value;
/**
* Creates a new argument resolver for a given type.
*
* @param type The type being resolved.
* @param value The instance to resolve for the represented type.
*/
protected ForType(Class type, T value) {
this.type = type;
this.value = value;
}
/**
* Creates an argument resolver for a given type.
*
* @param type The type being resolved.
* @param value The instance to resolve for the represented type.
* @param The type being resolved.
* @return An appropriate argument resolver.
*/
public static ArgumentResolver of(Class type, S value) {
return new ForType(type, value);
}
/**
* {@inheritDoc}
*/
public Resolution resolve(int index, Class type) {
return type == this.type
? new Resolution.Resolved(value)
: Resolution.Unresolved.INSTANCE;
}
}
/**
* An argument resolver that resolves an argument for a specific parameter index.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForIndex implements ArgumentResolver {
/**
* A mapping of primitive types to their wrapper types.
*/
private static final Map, Class> WRAPPER_TYPES;
/*
* Creates the primitive to wrapper type mapping.
*/
static {
WRAPPER_TYPES = new HashMap, Class>();
WRAPPER_TYPES.put(boolean.class, Boolean.class);
WRAPPER_TYPES.put(byte.class, Byte.class);
WRAPPER_TYPES.put(short.class, Short.class);
WRAPPER_TYPES.put(char.class, Character.class);
WRAPPER_TYPES.put(int.class, Integer.class);
WRAPPER_TYPES.put(long.class, Long.class);
WRAPPER_TYPES.put(float.class, Float.class);
WRAPPER_TYPES.put(double.class, Double.class);
}
/**
* The index of the parameter to resolve.
*/
private final int index;
/**
* The value to resolve for the represented index.
*/
@MaybeNull
@HashCodeAndEqualsPlugin.ValueHandling(HashCodeAndEqualsPlugin.ValueHandling.Sort.REVERSE_NULLABILITY)
private final Object value;
/**
* Creates an argument resolver for a given index.
*
* @param index The index of the parameter to resolve.
* @param value The value to resolve for the represented index.
*/
public ForIndex(int index, @MaybeNull Object value) {
this.index = index;
this.value = value;
}
/**
* {@inheritDoc}
*/
public Resolution resolve(int index, Class type) {
if (this.index != index) {
return Resolution.Unresolved.INSTANCE;
} else if (type.isPrimitive()) {
return WRAPPER_TYPES.get(type).isInstance(value)
? new Resolution.Resolved(value)
: Resolution.Unresolved.INSTANCE;
} else {
return value == null || type.isInstance(value)
? new Resolution.Resolved(value)
: Resolution.Unresolved.INSTANCE;
}
}
/**
* An argument resolver that resolves an argument for a specific parameter index by attempting a conversion via
* invoking a static {@code valueOf} method on the target type, if it exists. As an exception, the {@code char}
* and {@link Character} types are resolved if the string value represents a single character.
*/
@HashCodeAndEqualsPlugin.Enhance
public static class WithDynamicType implements ArgumentResolver {
/**
* The index of the parameter to resolve.
*/
private final int index;
/**
* A string representation of the supplied value.
*/
@MaybeNull
@HashCodeAndEqualsPlugin.ValueHandling(HashCodeAndEqualsPlugin.ValueHandling.Sort.REVERSE_NULLABILITY)
private final String value;
/**
* Creates an argument resolver for a specific parameter index and attempts a dynamic resolution.
*
* @param index The index of the parameter to resolve.
* @param value A string representation of the supplied value.
*/
public WithDynamicType(int index, @MaybeNull String value) {
this.index = index;
this.value = value;
}
/**
* {@inheritDoc}
*/
public Resolution resolve(int index, Class type) {
if (this.index != index) {
return Resolution.Unresolved.INSTANCE;
} else if (type == char.class || type == Character.class) {
return value != null && value.length() == 1
? new Resolution.Resolved(value.charAt(0))
: Resolution.Unresolved.INSTANCE;
} else if (type == String.class) {
return new Resolution.Resolved(value);
} else if (type.isPrimitive()) {
type = WRAPPER_TYPES.get(type);
}
try {
Method valueOf = type.getMethod("valueOf", String.class);
return Modifier.isStatic(valueOf.getModifiers()) && type.isAssignableFrom(valueOf.getReturnType())
? new Resolution.Resolved(valueOf.invoke(null, value))
: Resolution.Unresolved.INSTANCE;
} catch (IllegalAccessException exception) {
throw new IllegalStateException(exception);
} catch (InvocationTargetException exception) {
throw new IllegalStateException(exception.getTargetException());
} catch (NoSuchMethodException ignored) {
return Resolution.Unresolved.INSTANCE;
}
}
}
}
}
}
}
/**
* A plugin engine allows the application of one or more plugins on class files found at a {@link Source} which are
* then transferred and consumed by a {@link Target}.
*/
interface Engine {
/**
* The module info class file.
*/
String MODULE_INFO = "module-info" + ClassFileLocator.CLASS_FILE_EXTENSION;
/**
* The package info class file.
*/
String PACKAGE_INFO = "package-info" + ClassFileLocator.CLASS_FILE_EXTENSION;
/**
* The name of the file that contains declares Byte Buddy plugins for discovery.
*/
String PLUGIN_FILE = "META-INF/net.bytebuddy/build.plugins";
/**
* Defines a new Byte Buddy instance for usage for type creation.
*
* @param byteBuddy The Byte Buddy instance to use.
* @return A new plugin engine that is equal to this engine but uses the supplied Byte Buddy instance.
*/
Engine with(ByteBuddy byteBuddy);
/**
* Defines a new type strategy which determines the transformation mode for any instrumented type.
*
* @param typeStrategy The type stategy to use.
* @return A new plugin engine that is equal to this engine but uses the supplied type strategy.
*/
Engine with(TypeStrategy typeStrategy);
/**
* Defines a new pool strategy that determines how types are being described.
*
* @param poolStrategy The pool strategy to use.
* @return A new plugin engine that is equal to this engine but uses the supplied pool strategy.
*/
Engine with(PoolStrategy poolStrategy);
/**
* Appends the supplied class file locator to be queried for class files additionally to any previously registered
* class file locators.
*
* @param classFileLocator The class file locator to append.
* @return A new plugin engine that is equal to this engine but with the supplied class file locator being appended.
*/
Engine with(ClassFileLocator classFileLocator);
/**
* Uses the supplied {@link ClassFileVersion} as a base for resolving multi-release jars, or {@code null}
* if multi-release jars should not be resolved but be treated as regular jar files. This property might
* not be applied if the underlying location mechanism does not supply manual resource resolution. Note that
* classes that are of newer class file versions than the specified version are not resolved and simply copied.
*
* @param classFileVersion The class file version to use or {@code null} if multi-release jars should be ignored.
* @return A new plugin engine that is equal to this engine but with the supplied class file version being used.
*/
Engine with(@MaybeNull ClassFileVersion classFileVersion);
/**
* Appends the supplied listener to this engine.
*
* @param listener The listener to append.
* @return A new plugin engine that is equal to this engine but with the supplied listener being appended.
*/
Engine with(Listener listener);
/**
* Replaces the error handlers of this plugin engine without applying any error handlers.
*
* @return A new plugin engine that is equal to this engine but without any error handlers being registered.
*/
Engine withoutErrorHandlers();
/**
* Replaces the error handlers of this plugin engine with the supplied error handlers.
*
* @param errorHandler The error handlers to apply.
* @return A new plugin engine that is equal to this engine but with only the supplied error handlers being applied.
*/
Engine withErrorHandlers(ErrorHandler... errorHandler);
/**
* Replaces the error handlers of this plugin engine with the supplied error handlers.
*
* @param errorHandlers The error handlers to apply.
* @return A new plugin engine that is equal to this engine but with only the supplied error handlers being applied.
*/
Engine withErrorHandlers(List errorHandlers);
/**
* Replaces the dispatcher factory of this plugin engine with a parallel dispatcher factory that uses the given amount of threads.
*
* @param threads The amount of threads to use.
* @return A new plugin engine that is equal to this engine but with a parallel dispatcher factory using the specified amount of threads.
*/
Engine withParallelTransformation(int threads);
/**
* Replaces the dispatcher factory of this plugin engine with the supplied dispatcher factory.
*
* @param dispatcherFactory The dispatcher factory to use.
* @return A new plugin engine that is equal to this engine but with the supplied dispatcher factory being used.
*/
Engine with(Dispatcher.Factory dispatcherFactory);
/**
* Ignores all types that are matched by this matcher or any previously registered ignore matcher.
*
* @param matcher The ignore matcher to append.
* @return A new plugin engine that is equal to this engine but which ignores any type that is matched by the supplied matcher.
*/
Engine ignore(ElementMatcher matcher);
/**
* Applies this plugin engine onto a given source and target.
*
* @param source The source which is treated as a folder or a jar file, if a folder does not exist.
* @param target The target which is treated as a folder or a jar file, if a folder does not exist.
* @param factory A list of plugin factories to a apply.
* @return A summary of the applied transformation.
* @throws IOException If an I/O error occurs.
*/
Summary apply(File source, File target, Plugin.Factory... factory) throws IOException;
/**
* Applies this plugin engine onto a given source and target.
*
* @param source The source which is treated as a folder or a jar file, if a folder does not exist.
* @param target The target which is treated as a folder or a jar file, if a folder does not exist.
* @param factories A list of plugin factories to a apply.
* @return A summary of the applied transformation.
* @throws IOException If an I/O error occurs.
*/
Summary apply(File source, File target, List factories) throws IOException;
/**
* Applies this plugin engine onto a given source and target.
*
* @param source The source to use.
* @param target The target to use.
* @param factory A list of plugin factories to a apply.
* @return A summary of the applied transformation.
* @throws IOException If an I/O error occurs.
*/
Summary apply(Source source, Target target, Plugin.Factory... factory) throws IOException;
/**
* Applies this plugin engine onto a given source and target.
*
* @param source The source to use.
* @param target The target to use.
* @param factories A list of plugin factories to a apply.
* @return A summary of the applied transformation.
* @throws IOException If an I/O error occurs.
*/
Summary apply(Source source, Target target, List factories) throws IOException;
/**
* A type strategy determines the transformation that is applied to a type description.
*/
interface TypeStrategy {
/**
* Creates a builder for a given type.
*
* @param byteBuddy The Byte Buddy instance to use.
* @param typeDescription The type being transformed.
* @param classFileLocator A class file locator for finding the type's class file.
* @return A dynamic type builder for the provided type.
*/
DynamicType.Builder builder(ByteBuddy byteBuddy, TypeDescription typeDescription, ClassFileLocator classFileLocator);
/**
* Default implementations for type strategies.
*/
enum Default implements TypeStrategy {
/**
* A type strategy that redefines a type's methods.
*/
REDEFINE {
/**
* {@inheritDoc}
*/
public DynamicType.Builder builder(ByteBuddy byteBuddy, TypeDescription typeDescription, ClassFileLocator classFileLocator) {
return byteBuddy.redefine(typeDescription, classFileLocator);
}
},
/**
* A type strategy that rebases a type's methods.
*/
REBASE {
/**
* {@inheritDoc}
*/
public DynamicType.Builder builder(ByteBuddy byteBuddy, TypeDescription typeDescription, ClassFileLocator classFileLocator) {
return byteBuddy.rebase(typeDescription, classFileLocator);
}
},
/**
* A type strategy that decorates a type.
*/
DECORATE {
/**
* {@inheritDoc}
*/
public DynamicType.Builder builder(ByteBuddy byteBuddy, TypeDescription typeDescription, ClassFileLocator classFileLocator) {
return byteBuddy.decorate(typeDescription, classFileLocator);
}
}
}
/**
* A type strategy that represents a given {@link EntryPoint} for a build tool.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForEntryPoint implements TypeStrategy {
/**
* The represented entry point.
*/
private final EntryPoint entryPoint;
/**
* A method name transformer to use for rebasements.
*/
private final MethodNameTransformer methodNameTransformer;
/**
* Creates a new type stratrgy for an entry point.
*
* @param entryPoint The represented entry point.
* @param methodNameTransformer A method name transformer to use for rebasements.
*/
public ForEntryPoint(EntryPoint entryPoint, MethodNameTransformer methodNameTransformer) {
this.entryPoint = entryPoint;
this.methodNameTransformer = methodNameTransformer;
}
/**
* {@inheritDoc}
*/
public DynamicType.Builder builder(ByteBuddy byteBuddy, TypeDescription typeDescription, ClassFileLocator classFileLocator) {
return entryPoint.transform(typeDescription, byteBuddy, classFileLocator, methodNameTransformer);
}
}
}
/**
* A pool strategy determines the creation of a {@link TypePool} for a plugin engine application.
*/
interface PoolStrategy {
/**
* Creates a type pool.
*
* @param classFileLocator The class file locator to use.
* @return An approptiate type pool.
*/
TypePool typePool(ClassFileLocator classFileLocator);
/**
* A default implementation of a pool strategy where type descriptions are resolved lazily.
*/
enum Default implements PoolStrategy {
/**
* Enables faster class file parsing that does not process debug information of a class file.
*/
FAST(TypePool.Default.ReaderMode.FAST),
/**
* Enables extended class file parsing that extracts parameter names from debug information, if available.
*/
EXTENDED(TypePool.Default.ReaderMode.EXTENDED);
/**
* This strategy's reader mode.
*/
private final TypePool.Default.ReaderMode readerMode;
/**
* Creates a default pool strategy.
*
* @param readerMode This strategy's reader mode.
*/
Default(TypePool.Default.ReaderMode readerMode) {
this.readerMode = readerMode;
}
/**
* {@inheritDoc}
*/
public TypePool typePool(ClassFileLocator classFileLocator) {
return new TypePool.Default.WithLazyResolution(new TypePool.CacheProvider.Simple(),
classFileLocator,
readerMode,
TypePool.ClassLoading.ofPlatformLoader());
}
}
/**
* A pool strategy that resolves type descriptions eagerly. This can avoid additional overhead if the
* majority of types is assumed to be resolved eventually.
*/
enum Eager implements PoolStrategy {
/**
* Enables faster class file parsing that does not process debug information of a class file.
*/
FAST(TypePool.Default.ReaderMode.FAST),
/**
* Enables extended class file parsing that extracts parameter names from debug information, if available.
*/
EXTENDED(TypePool.Default.ReaderMode.EXTENDED);
/**
* This strategy's reader mode.
*/
private final TypePool.Default.ReaderMode readerMode;
/**
* Creates an eager pool strategy.
*
* @param readerMode This strategy's reader mode.
*/
Eager(TypePool.Default.ReaderMode readerMode) {
this.readerMode = readerMode;
}
/**
* {@inheritDoc}
*/
public TypePool typePool(ClassFileLocator classFileLocator) {
return new TypePool.Default(new TypePool.CacheProvider.Simple(),
classFileLocator,
readerMode,
TypePool.ClassLoading.ofPlatformLoader());
}
}
}
/**
* An error handler that is used during a plugin engine application.
*/
interface ErrorHandler {
/**
* Invoked if an error occured during a plugin's application on a given type.
*
* @param typeDescription The type being matched or transformed.
* @param plugin The plugin being applied.
* @param throwable The throwable that caused the error.
*/
void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable);
/**
* Invoked after the application of all plugins was attempted if at least one error occured during handling a given type.
*
* @param typeDescription The type being transformed.
* @param throwables The throwables that caused errors during the application.
*/
void onError(TypeDescription typeDescription, List throwables);
/**
* Invoked at the end of the build if at least one type transformation failed.
*
* @param throwables A mapping of types that failed during transformation to the errors that were caught.
*/
void onError(Map> throwables);
/**
* Invoked at the end of the build if a plugin could not be closed.
*
* @param plugin The plugin that could not be closed.
* @param throwable The error that was caused when the plugin was attempted to be closed.
*/
void onError(Plugin plugin, Throwable throwable);
/**
* Invoked if a type transformation implied a live initializer.
*
* @param typeDescription The type that was transformed.
* @param definingType The type that implies the initializer which might be the type itself or an auxiliary type.
*/
void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType);
/**
* Invoked if a type could not be resolved.
*
* @param typeName The name of the unresolved type.
*/
void onUnresolved(String typeName);
/**
* Invoked when a manifest was found or found missing.
*
* @param manifest The located manifest or {@code null} if no manifest was found.
*/
void onManifest(@MaybeNull Manifest manifest);
/**
* Invoked if a resource that is not a class file is discovered.
*
* @param name The name of the discovered resource.
*/
void onResource(String name);
/**
* An implementation of an error handler that fails the plugin engine application.
*/
enum Failing implements ErrorHandler {
/**
* An error handler that fails the build immediatly on the first error.
*/
FAIL_FAST {
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
throw new IllegalStateException("Failed to transform " + typeDescription + " using " + plugin, throwable);
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, List throwables) {
throw new IllegalStateException("Failed to transform " + typeDescription + ": " + throwables);
}
/**
* {@inheritDoc}
*/
public void onError(Map> throwables) {
throw new IllegalStateException("Failed to transform at least one type: " + throwables);
}
},
/**
* An error handler that fails the build after applying all plugins if at least one plugin failed.
*/
FAIL_AFTER_TYPE {
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, List throwables) {
throw new IllegalStateException("Failed to transform " + typeDescription + ": " + throwables);
}
/**
* {@inheritDoc}
*/
public void onError(Map> throwables) {
throw new IllegalStateException("Failed to transform at least one type: " + throwables);
}
},
/**
* An error handler that fails the build after transforming all types if at least one plugin failed.
*/
FAIL_LAST {
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, List throwables) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(Map> throwables) {
throw new IllegalStateException("Failed to transform at least one type: " + throwables);
}
};
/**
* {@inheritDoc}
*/
public void onError(Plugin plugin, Throwable throwable) {
throw new IllegalStateException("Failed to close plugin " + plugin, throwable);
}
/**
* {@inheritDoc}
*/
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onUnresolved(String typeName) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onManifest(Manifest manifest) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onResource(String name) {
/* do nothing */
}
}
/**
* An error handler that enforces certain properties of the transformation.
*/
enum Enforcing implements ErrorHandler {
/**
* Enforces that all types could be resolved.
*/
ALL_TYPES_RESOLVED {
@Override
public void onUnresolved(String typeName) {
throw new IllegalStateException("Failed to resolve type description for " + typeName);
}
},
/**
* Enforces that no type has a live initializer.
*/
NO_LIVE_INITIALIZERS {
@Override
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription initializedType) {
throw new IllegalStateException("Failed to instrument " + typeDescription + " due to live initializer for " + initializedType);
}
},
/**
* Enforces that a source only produces class files.
*/
CLASS_FILES_ONLY {
@Override
public void onResource(String name) {
throw new IllegalStateException("Discovered a resource when only class files were allowed: " + name);
}
},
/**
* Enforces that a manifest is written to a target.
*/
MANIFEST_REQUIRED {
@Override
public void onManifest(@MaybeNull Manifest manifest) {
if (manifest == null) {
throw new IllegalStateException("Required a manifest but no manifest was found");
}
}
};
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, List throwables) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(Map> throwables) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(Plugin plugin, Throwable throwable) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onUnresolved(String typeName) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onManifest(@MaybeNull Manifest manifest) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onResource(String name) {
/* do nothing */
}
}
/**
* A compound error handler.
*/
class Compound implements ErrorHandler {
/**
* The error handlers that are represented by this instance.
*/
private final List errorHandlers;
/**
* Creates a new compound error handler.
*
* @param errorHandler The error handlers that are represented by this instance.
*/
public Compound(ErrorHandler... errorHandler) {
this(Arrays.asList(errorHandler));
}
/**
* Creates a new compound error handler.
*
* @param errorHandlers The error handlers that are represented by this instance.
*/
public Compound(List errorHandlers) {
this.errorHandlers = new ArrayList();
for (ErrorHandler errorHandler : errorHandlers) {
if (errorHandler instanceof Compound) {
this.errorHandlers.addAll(((Compound) errorHandler).errorHandlers);
} else if (!(errorHandler instanceof Listener.NoOp)) {
this.errorHandlers.add(errorHandler);
}
}
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
for (ErrorHandler errorHandler : errorHandlers) {
errorHandler.onError(typeDescription, plugin, throwable);
}
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, List throwables) {
for (ErrorHandler errorHandler : errorHandlers) {
errorHandler.onError(typeDescription, throwables);
}
}
/**
* {@inheritDoc}
*/
public void onError(Map> throwables) {
for (ErrorHandler errorHandler : errorHandlers) {
errorHandler.onError(throwables);
}
}
/**
* {@inheritDoc}
*/
public void onError(Plugin plugin, Throwable throwable) {
for (ErrorHandler errorHandler : errorHandlers) {
errorHandler.onError(plugin, throwable);
}
}
/**
* {@inheritDoc}
*/
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType) {
for (ErrorHandler errorHandler : errorHandlers) {
errorHandler.onLiveInitializer(typeDescription, definingType);
}
}
/**
* {@inheritDoc}
*/
public void onUnresolved(String typeName) {
for (ErrorHandler errorHandler : errorHandlers) {
errorHandler.onUnresolved(typeName);
}
}
/**
* {@inheritDoc}
*/
public void onManifest(@MaybeNull Manifest manifest) {
for (ErrorHandler errorHandler : errorHandlers) {
errorHandler.onManifest(manifest);
}
}
/**
* {@inheritDoc}
*/
public void onResource(String name) {
for (ErrorHandler errorHandler : errorHandlers) {
errorHandler.onResource(name);
}
}
}
}
/**
* A listener that is invoked upon any event during a plugin engine application.
*/
interface Listener extends ErrorHandler {
/**
* Invoked upon discovering a type but prior to its resolution.
*
* @param typeName The name of the discovered type.
*/
void onDiscovery(String typeName);
/**
* Invoked after a type was transformed using a specific plugin.
*
* @param typeDescription The type being transformed.
* @param plugin The plugin that was applied.
*/
void onTransformation(TypeDescription typeDescription, Plugin plugin);
/**
* Invoked after a type was transformed using at least one plugin.
*
* @param typeDescription The type being transformed.
* @param plugins A list of plugins that were applied.
*/
void onTransformation(TypeDescription typeDescription, List plugins);
/**
* Invoked if a type description is ignored by a given plugin. This callback is not invoked,
* if the ignore type matcher excluded a type from transformation.
*
* @param typeDescription The type being transformed.
* @param plugin The plugin that ignored the given type.
*/
void onIgnored(TypeDescription typeDescription, Plugin plugin);
/**
* Invoked if one or more plugins did not transform a type. This callback is also invoked if an
* ignore matcher excluded a type from transformation.
*
* @param typeDescription The type being transformed.
* @param plugins the plugins that ignored the type.
*/
void onIgnored(TypeDescription typeDescription, List plugins);
/**
* Invoked upon completing handling a type that was either transformed or ignored.
*
* @param typeDescription The type that was transformed.
*/
void onComplete(TypeDescription typeDescription);
/**
* A non-operational listener.
*/
enum NoOp implements Listener {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public void onDiscovery(String typeName) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onTransformation(TypeDescription typeDescription, Plugin plugin) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onTransformation(TypeDescription typeDescription, List plugins) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onIgnored(TypeDescription typeDescription, Plugin plugin) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onIgnored(TypeDescription typeDescription, List plugins) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, List throwables) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(Map> throwables) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(Plugin plugin, Throwable throwable) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onComplete(TypeDescription typeDescription) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onUnresolved(String typeName) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onManifest(@MaybeNull Manifest manifest) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onResource(String name) {
/* do nothing */
}
}
/**
* An adapter that implements all methods non-operational.
*/
abstract class Adapter implements Listener {
/**
* {@inheritDoc}
*/
public void onDiscovery(String typeName) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onTransformation(TypeDescription typeDescription, Plugin plugin) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onTransformation(TypeDescription typeDescription, List plugins) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onIgnored(TypeDescription typeDescription, Plugin plugin) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onIgnored(TypeDescription typeDescription, List plugins) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, List throwables) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(Map> throwables) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onError(Plugin plugin, Throwable throwable) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onComplete(TypeDescription typeDescription) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onUnresolved(String typeName) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onManifest(@MaybeNull Manifest manifest) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void onResource(String name) {
/* do nothing */
}
}
/**
* A listener that forwards significant events of a plugin engine application to a {@link PrintStream}.
*/
@HashCodeAndEqualsPlugin.Enhance
class StreamWriting extends Adapter {
/**
* The prefix that is appended to all written messages.
*/
protected static final String PREFIX = "[Byte Buddy]";
/**
* The print stream to delegate to.
*/
private final PrintStream printStream;
/**
* Creates a new stream writing listener.
*
* @param printStream The print stream to delegate to.
*/
public StreamWriting(PrintStream printStream) {
this.printStream = printStream;
}
/**
* Creates a stream writing listener that prints all events on {@link System#out}.
*
* @return A listener that writes events to the system output stream.
*/
public static StreamWriting toSystemOut() {
return new StreamWriting(System.out);
}
/**
* Creates a stream writing listener that prints all events on {@link System#err}.
*
* @return A listener that writes events to the system error stream.
*/
public static StreamWriting toSystemError() {
return new StreamWriting(System.err);
}
/**
* Returns a new listener that only prints transformation and error events.
*
* @return A new listener that only prints transformation and error events.
*/
public Listener withTransformationsOnly() {
return new WithTransformationsOnly(this);
}
/**
* Returns a new listener that only prints error events.
*
* @return A new listener that only prints error events.
*/
public Listener withErrorsOnly() {
return new WithErrorsOnly(this);
}
/**
* {@inheritDoc}
*/
public void onDiscovery(String typeName) {
printStream.printf(PREFIX + " DISCOVERY %s", typeName);
}
/**
* {@inheritDoc}
*/
public void onTransformation(TypeDescription typeDescription, Plugin plugin) {
printStream.printf(PREFIX + " TRANSFORM %s for %s", typeDescription, plugin);
}
/**
* {@inheritDoc}
*/
public void onIgnored(TypeDescription typeDescription, Plugin plugin) {
printStream.printf(PREFIX + " IGNORE %s for %s", typeDescription, plugin);
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
synchronized (printStream) {
printStream.printf(PREFIX + " ERROR %s for %s", typeDescription, plugin);
throwable.printStackTrace(printStream);
}
}
/**
* {@inheritDoc}
*/
public void onError(Plugin plugin, Throwable throwable) {
synchronized (printStream) {
printStream.printf(PREFIX + " ERROR %s", plugin);
throwable.printStackTrace(printStream);
}
}
/**
* {@inheritDoc}
*/
public void onUnresolved(String typeName) {
printStream.printf(PREFIX + " UNRESOLVED %s", typeName);
}
/**
* {@inheritDoc}
*/
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType) {
printStream.printf(PREFIX + " LIVE %s on %s", typeDescription, definingType);
}
/**
* {@inheritDoc}
*/
public void onComplete(TypeDescription typeDescription) {
printStream.printf(PREFIX + " COMPLETE %s", typeDescription);
}
/**
* {@inheritDoc}
*/
public void onManifest(@MaybeNull Manifest manifest) {
printStream.printf(PREFIX + " MANIFEST %b", manifest != null);
}
/**
* {@inheritDoc}
*/
public void onResource(String name) {
printStream.printf(PREFIX + " RESOURCE %s", name);
}
}
/**
* A decorator for another listener to only print transformation and error events.
*/
@HashCodeAndEqualsPlugin.Enhance
class WithTransformationsOnly extends Adapter {
/**
* The delegate to forward events to.
*/
private final Listener delegate;
/**
* Creates a new listener decorator that filter any event that is not related to transformation or errors.
*
* @param delegate The delegate to forward events to.
*/
public WithTransformationsOnly(Listener delegate) {
this.delegate = delegate;
}
@Override
public void onTransformation(TypeDescription typeDescription, Plugin plugin) {
delegate.onTransformation(typeDescription, plugin);
}
@Override
public void onTransformation(TypeDescription typeDescription, List plugins) {
delegate.onTransformation(typeDescription, plugins);
}
@Override
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
delegate.onError(typeDescription, plugin, throwable);
}
@Override
public void onError(TypeDescription typeDescription, List throwables) {
delegate.onError(typeDescription, throwables);
}
@Override
public void onError(Map> throwables) {
delegate.onError(throwables);
}
@Override
public void onError(Plugin plugin, Throwable throwable) {
delegate.onError(plugin, throwable);
}
}
/**
* A decorator for another listener to only print error events.
*/
@HashCodeAndEqualsPlugin.Enhance
class WithErrorsOnly extends Adapter {
/**
* The delegate to forward events to.
*/
private final Listener delegate;
/**
* Creates a new listener decorator that filter any event that is not related to errors.
*
* @param delegate The delegate to forward events to.
*/
public WithErrorsOnly(Listener delegate) {
this.delegate = delegate;
}
@Override
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
delegate.onError(typeDescription, plugin, throwable);
}
@Override
public void onError(TypeDescription typeDescription, List throwables) {
delegate.onError(typeDescription, throwables);
}
@Override
public void onError(Map> throwables) {
delegate.onError(throwables);
}
@Override
public void onError(Plugin plugin, Throwable throwable) {
delegate.onError(plugin, throwable);
}
}
/**
* A listener decorator that forwards events to an error handler if they are applicable.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForErrorHandler extends Adapter {
/**
* The error handler to delegate to.
*/
private final ErrorHandler errorHandler;
/**
* Creates a new listener representation for an error handler.
*
* @param errorHandler The error handler to delegate to.
*/
public ForErrorHandler(ErrorHandler errorHandler) {
this.errorHandler = errorHandler;
}
@Override
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
errorHandler.onError(typeDescription, plugin, throwable);
}
@Override
public void onError(TypeDescription typeDescription, List throwables) {
errorHandler.onError(typeDescription, throwables);
}
@Override
public void onError(Map> throwables) {
errorHandler.onError(throwables);
}
@Override
public void onError(Plugin plugin, Throwable throwable) {
errorHandler.onError(plugin, throwable);
}
@Override
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType) {
errorHandler.onLiveInitializer(typeDescription, definingType);
}
@Override
public void onUnresolved(String typeName) {
errorHandler.onUnresolved(typeName);
}
@Override
public void onManifest(@MaybeNull Manifest manifest) {
errorHandler.onManifest(manifest);
}
@Override
public void onResource(String name) {
errorHandler.onResource(name);
}
}
/**
* A compound listener.
*/
@HashCodeAndEqualsPlugin.Enhance
class Compound implements Listener {
/**
* A list of listeners that are represented by this compound instance.
*/
private final List listeners;
/**
* Creates a new compound listener.
*
* @param listener A list of listeners that are represented by this compound instance.
*/
public Compound(Listener... listener) {
this(Arrays.asList(listener));
}
/**
* Creates a new compound listener.
*
* @param listeners A list of listeners that are represented by this compound instance.
*/
public Compound(List listeners) {
this.listeners = new ArrayList();
for (Listener listener : listeners) {
if (listener instanceof Listener.Compound) {
this.listeners.addAll(((Listener.Compound) listener).listeners);
} else if (!(listener instanceof NoOp)) {
this.listeners.add(listener);
}
}
}
/**
* {@inheritDoc}
*/
public void onDiscovery(String typeName) {
for (Listener listener : listeners) {
listener.onDiscovery(typeName);
}
}
/**
* {@inheritDoc}
*/
public void onTransformation(TypeDescription typeDescription, Plugin plugin) {
for (Listener listener : listeners) {
listener.onTransformation(typeDescription, plugin);
}
}
/**
* {@inheritDoc}
*/
public void onTransformation(TypeDescription typeDescription, List plugins) {
for (Listener listener : listeners) {
listener.onTransformation(typeDescription, plugins);
}
}
/**
* {@inheritDoc}
*/
public void onIgnored(TypeDescription typeDescription, Plugin plugin) {
for (Listener listener : listeners) {
listener.onIgnored(typeDescription, plugin);
}
}
/**
* {@inheritDoc}
*/
public void onIgnored(TypeDescription typeDescription, List plugins) {
for (Listener listener : listeners) {
listener.onIgnored(typeDescription, plugins);
}
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, Plugin plugin, Throwable throwable) {
for (Listener listener : listeners) {
listener.onError(typeDescription, plugin, throwable);
}
}
/**
* {@inheritDoc}
*/
public void onError(TypeDescription typeDescription, List throwables) {
for (Listener listener : listeners) {
listener.onError(typeDescription, throwables);
}
}
/**
* {@inheritDoc}
*/
public void onError(Map> throwables) {
for (Listener listener : listeners) {
listener.onError(throwables);
}
}
/**
* {@inheritDoc}
*/
public void onError(Plugin plugin, Throwable throwable) {
for (Listener listener : listeners) {
listener.onError(plugin, throwable);
}
}
/**
* {@inheritDoc}
*/
public void onLiveInitializer(TypeDescription typeDescription, TypeDescription definingType) {
for (Listener listener : listeners) {
listener.onLiveInitializer(typeDescription, definingType);
}
}
/**
* {@inheritDoc}
*/
public void onComplete(TypeDescription typeDescription) {
for (Listener listener : listeners) {
listener.onComplete(typeDescription);
}
}
/**
* {@inheritDoc}
*/
public void onUnresolved(String typeName) {
for (Listener listener : listeners) {
listener.onUnresolved(typeName);
}
}
/**
* {@inheritDoc}
*/
public void onManifest(@MaybeNull Manifest manifest) {
for (Listener listener : listeners) {
listener.onManifest(manifest);
}
}
/**
* {@inheritDoc}
*/
public void onResource(String name) {
for (Listener listener : listeners) {
listener.onResource(name);
}
}
}
}
/**
* A source for a plugin engine provides binary elements to consider for transformation.
*/
interface Source {
/**
* Initiates reading from a source.
*
* @return The origin to read from.
* @throws IOException If an I/O error occurs.
*/
Origin read() throws IOException;
/**
* An origin for elements.
*/
interface Origin extends Iterable, Closeable {
/**
* Indicates that no manifest exists.
*/
@AlwaysNull
Manifest NO_MANIFEST = null;
/**
* Returns the manifest file of the source location or {@code null} if no manifest exists.
*
* @return This source's manifest or {@code null}.
* @throws IOException If an I/O error occurs.
*/
@MaybeNull
Manifest getManifest() throws IOException;
/**
* Creates a class file locator for the represented source. If the class file locator needs to be closed,
* it is the responsibility of this origin to close the locator or its underlying resources.
*
* @param classFileVersion The class file version to consider for multi-release jars or {@code null}
* if multi-release jars should not be considered.
* @return A class file locator for locating class files of this instance.
* @throws IOException If an I/O exception occurs.
*/
ClassFileLocator toClassFileLocator(@MaybeNull ClassFileVersion classFileVersion) throws IOException;
/**
* An origin implementation for a jar file.
*/
class ForJarFile implements Origin {
/**
* The represented file.
*/
private final JarFile file;
/**
* Creates a new origin for a jar file.
*
* @param file The represented file.
*/
public ForJarFile(JarFile file) {
this.file = file;
}
/**
* {@inheritDoc}
*/
@MaybeNull
public Manifest getManifest() throws IOException {
return file.getManifest();
}
/**
* {@inheritDoc}
*/
public ClassFileLocator toClassFileLocator(@MaybeNull ClassFileVersion classFileVersion) throws IOException {
return classFileVersion == null
? new ClassFileLocator.ForJarFile(file)
: ClassFileLocator.ForJarFile.of(file, classFileVersion);
}
/**
* {@inheritDoc}
*/
public void close() throws IOException {
file.close();
}
/**
* {@inheritDoc}
*/
public Iterator iterator() {
return new JarFileIterator(file.entries());
}
/**
* An iterator for jar file entries.
*/
protected class JarFileIterator implements Iterator {
/**
* The represented enumeration.
*/
private final Enumeration enumeration;
/**
* Creates a new jar file iterator.
*
* @param enumeration The represented enumeration.
*/
protected JarFileIterator(Enumeration enumeration) {
this.enumeration = enumeration;
}
/**
* {@inheritDoc}
*/
public boolean hasNext() {
return enumeration.hasMoreElements();
}
/**
* {@inheritDoc}
*/
public Element next() {
return new Element.ForJarEntry(file, enumeration.nextElement());
}
/**
* {@inheritDoc}
*/
public void remove() {
throw new UnsupportedOperationException("remove");
}
}
}
/**
* An origin that forwards all invocations to a delegate where an {@link ElementMatcher} is applied prior to iteration.
*/
@HashCodeAndEqualsPlugin.Enhance
class Filtering implements Origin {
/**
* The origin to which invocations are delegated.
*/
private final Origin delegate;
/**
* The element matcher being used to filter elements.
*/
private final ElementMatcher matcher;
/**
* {@code true} if the manifest should be retained.
*/
private final boolean manifest;
/**
* Creates a new filtering origin that retains the delegated origin's manifest.
*
* @param delegate The origin to which invocations are delegated.
* @param matcher The element matcher being used to filter elements.
*/
public Filtering(Origin delegate, ElementMatcher matcher) {
this(delegate, matcher, true);
}
/**
* Creates a new filtering origin.
*
* @param delegate The origin to which invocations are delegated.
* @param matcher The element matcher being used to filter elements.
* @param manifest {@code true} if the manifest should be retained.
*/
public Filtering(Origin delegate, ElementMatcher matcher, boolean manifest) {
this.delegate = delegate;
this.matcher = matcher;
this.manifest = manifest;
}
/**
* {@inheritDoc}
*/
@MaybeNull
public Manifest getManifest() throws IOException {
return manifest ? delegate.getManifest() : NO_MANIFEST;
}
/**
* {@inheritDoc}
*/
public ClassFileLocator toClassFileLocator(@MaybeNull ClassFileVersion classFileVersion) throws IOException {
return delegate.toClassFileLocator(classFileVersion);
}
/**
* {@inheritDoc}
*/
public Iterator iterator() {
return new FilteringIterator(delegate.iterator(), matcher);
}
/**
* {@inheritDoc}
*/
public void close() throws IOException {
delegate.close();
}
/**
* An iterator that applies a filter to observed elements.
*/
private static class FilteringIterator implements Iterator {
/**
* The underlying iterator.
*/
private final Iterator iterator;
/**
* The element matcher being used to filter elements.
*/
private final ElementMatcher matcher;
/**
* The current element or {@code null} if no further elements are available.
*/
@MaybeNull
private Element current;
/**
* Creates a new filtering iterator.
*
* @param iterator The underlying iterator.
* @param matcher The element matcher being used to filter elements.
*/
private FilteringIterator(Iterator iterator, ElementMatcher matcher) {
this.iterator = iterator;
this.matcher = matcher;
Element element;
while (iterator.hasNext()) {
element = iterator.next();
if (matcher.matches(element)) {
current = element;
break;
}
}
}
/**
* {@inheritDoc}
*/
public boolean hasNext() {
return current != null;
}
/**
* {@inheritDoc}
*/
public Element next() {
if (current == null) {
throw new NoSuchElementException();
}
try {
return current;
} finally {
current = null;
Element element;
while (iterator.hasNext()) {
element = iterator.next();
if (matcher.matches(element)) {
current = element;
break;
}
}
}
}
/**
* {@inheritDoc}
*/
public void remove() {
iterator.remove();
}
}
}
}
/**
* Represents a binary element found in a source location.
*/
interface Element {
/**
* Returns the element's relative path and name.
*
* @return The element's path and name.
*/
String getName();
/**
* Returns an input stream to read this element's binary information.
*
* @return An input stream that represents this element's binary information.
* @throws IOException If an I/O error occurs.
*/
InputStream getInputStream() throws IOException;
/**
* Resolves this element to a more specialized form if possible. Doing so allows for performance
* optimizations if more specialized formats are available.
*
* @param type The requested spezialized type.
* @param The requested spezialized type.
* @return The resolved element or {@code null} if a transformation is impossible.
*/
@MaybeNull
T resolveAs(Class type);
/**
* An element representation for a byte array.
*/
@SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "The array is not modified by class contract.")
@HashCodeAndEqualsPlugin.Enhance
class ForByteArray implements Element {
/**
* The element's name.
*/
private final String name;
/**
* The element's binary representation.
*/
private final byte[] binaryRepresentation;
/**
* Creates an element that is represented by a byte array.
*
* @param name The element's name.
* @param binaryRepresentation The element's binary representation.
*/
public ForByteArray(String name, byte[] binaryRepresentation) {
this.name = name;
this.binaryRepresentation = binaryRepresentation;
}
/**
* {@inheritDoc}
*/
public String getName() {
return name;
}
/**
* {@inheritDoc}
*/
public InputStream getInputStream() {
return new ByteArrayInputStream(binaryRepresentation);
}
/**
* {@inheritDoc}
*/
@AlwaysNull
public T resolveAs(Class type) {
return null;
}
}
/**
* An element representation for a file.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForFile implements Element {
/**
* The root folder of the represented source.
*/
private final File root;
/**
* The file location of the represented file that is located within the root directory.
*/
private final File file;
/**
* Creates an element representation for a file.
*
* @param root The root folder of the represented source.
* @param file The file location of the represented file that is located within the root directory.
*/
public ForFile(File root, File file) {
this.root = root;
this.file = file;
}
/**
* {@inheritDoc}
*/
public String getName() {
return root.getAbsoluteFile().toURI().relativize(file.getAbsoluteFile().toURI()).getPath();
}
/**
* {@inheritDoc}
*/
public InputStream getInputStream() throws IOException {
return new FileInputStream(file);
}
/**
* {@inheritDoc}
*/
@MaybeNull
@SuppressWarnings("unchecked")
public T resolveAs(Class type) {
return File.class.isAssignableFrom(type)
? (T) file
: null;
}
}
/**
* Represents a jar file entry as an element.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForJarEntry implements Element {
/**
* The source's underlying jar file.
*/
private final JarFile file;
/**
* The entry that is represented by this element.
*/
private final JarEntry entry;
/**
* Creates a new element representation for a jar file entry.
*
* @param file The source's underlying jar file.
* @param entry The entry that is represented by this element.
*/
public ForJarEntry(JarFile file, JarEntry entry) {
this.file = file;
this.entry = entry;
}
/**
* {@inheritDoc}
*/
public String getName() {
return entry.getName();
}
/**
* {@inheritDoc}
*/
public InputStream getInputStream() throws IOException {
return file.getInputStream(entry);
}
/**
* {@inheritDoc}
*/
@MaybeNull
@SuppressWarnings("unchecked")
public T resolveAs(Class type) {
return JarEntry.class.isAssignableFrom(type)
? (T) entry
: null;
}
}
}
/**
* An empty source that does not contain any elements or a manifest.
*/
enum Empty implements Source, Origin {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public Origin read() {
return this;
}
/**
* {@inheritDoc}
*/
public ClassFileLocator toClassFileLocator(@MaybeNull ClassFileVersion classFileVersion) {
return ClassFileLocator.NoOp.INSTANCE;
}
/**
* {@inheritDoc}
*/
@MaybeNull
public Manifest getManifest() {
return NO_MANIFEST;
}
/**
* {@inheritDoc}
*/
public Iterator iterator() {
return Collections.emptySet().iterator();
}
/**
* {@inheritDoc}
*/
public void close() {
/* do nothing */
}
}
/**
* A compound source that combines multiple sources into a single representation.
*/
@HashCodeAndEqualsPlugin.Enhance
class Compound implements Source {
/**
* The represented sources.
*/
private final Collection sources;
/**
* Creates a new compound source.
*
* @param sources The represented sources.
*/
public Compound(Collection sources) {
this.sources = sources;
}
/**
* {@inheritDoc}
*/
public Source.Origin read() throws IOException {
if (sources.isEmpty()) {
return Empty.INSTANCE;
} else if (sources.size() == 1) {
return sources.iterator().next().read();
}
List origins = new ArrayList(sources.size());
try {
for (Source source : sources) {
origins.add(source.read());
}
} catch (IOException exception) {
for (Source.Origin origin : origins) {
origin.close();
}
throw exception;
}
return new Origin(origins);
}
/**
* Implements a compound {@link Source.Origin}.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class Origin implements Source.Origin {
/**
* A list of represented origins.
*/
private final List origins;
/**
* Creates a new compound origin.
*
* @param origins A list of represented origins.
*/
protected Origin(List origins) {
this.origins = origins;
}
/**
* {@inheritDoc}
*/
public Manifest getManifest() throws IOException {
for (Source.Origin origin : origins) {
Manifest manifest = origin.getManifest();
if (manifest != null) {
return manifest;
}
}
return NO_MANIFEST;
}
/**
* {@inheritDoc}
*/
public ClassFileLocator toClassFileLocator(@MaybeNull ClassFileVersion classFileVersion) throws IOException {
List classFileLocators = new ArrayList(origins.size());
for (Source.Origin origin : origins) {
classFileLocators.add(origin.toClassFileLocator(classFileVersion));
}
return new ClassFileLocator.Compound(classFileLocators);
}
/**
* {@inheritDoc}
*/
public Iterator iterator() {
return new CompoundIterator(origins);
}
/**
* {@inheritDoc}
*/
public void close() throws IOException {
for (Source.Origin origin : origins) {
origin.close();
}
}
/**
* A compound iterator that combines several iterables.
*/
protected static class CompoundIterator implements Iterator {
/**
* The current iterator or {@code null} if no such iterator is defined.
*/
@MaybeNull
private Iterator current;
/**
* A backlog of iterables to still consider.
*/
private final List> backlog;
/**
* Creates a compound iterator.
*
* @param iterables The iterables to consider.
*/
protected CompoundIterator(List> iterables) {
backlog = iterables;
forward();
}
/**
* {@inheritDoc}
*/
public boolean hasNext() {
return current != null && current.hasNext();
}
/**
* {@inheritDoc}
*/
public Element next() {
try {
if (current != null) {
return current.next();
} else {
throw new NoSuchElementException();
}
} finally {
forward();
}
}
/**
* Forwards the iterator to the next relevant iterable.
*/
private void forward() {
while ((current == null || !current.hasNext()) && !backlog.isEmpty()) {
current = backlog.remove(0).iterator();
}
}
/**
* {@inheritDoc}
*/
public void remove() {
throw new UnsupportedOperationException("remove");
}
}
}
}
/**
* A source that represents a collection of in-memory resources that are represented as byte arrays.
*/
@HashCodeAndEqualsPlugin.Enhance
class InMemory implements Source, Origin {
/**
* A mapping of resource names to their binary representation.
*/
private final Map storage;
/**
* Creates a new in-memory source.
*
* @param storage A mapping of resource names to their binary representation.
*/
public InMemory(Map storage) {
this.storage = storage;
}
/**
* Represents a collection of types as an in-memory source.
*
* @param type The types to represent.
* @return A source representing the supplied types.
*/
public static Source ofTypes(Class... type) {
return ofTypes(Arrays.asList(type));
}
/**
* Represents a collection of types as an in-memory source.
*
* @param types The types to represent.
* @return A source representing the supplied types.
*/
public static Source ofTypes(Collection> types) {
return ofTypes(types, Collections.>>emptyMap());
}
/**
* Represents a collection of types as an in-memory source.
*
* @param types The types to represent.
* @param versionedTypes A versioned mapping of types to represent.
* @return A source representing the supplied types.
*/
public static Source ofTypes(Collection> types, Map>> versionedTypes) {
Map> versionedBinaryRepresentations = new HashMap>();
for (Map.Entry>> entry : versionedTypes.entrySet()) {
Map binaryRepresentations = new HashMap();
for (Class type : entry.getValue()) {
binaryRepresentations.put(TypeDescription.ForLoadedType.of(type), ClassFileLocator.ForClassLoader.read(type));
}
versionedBinaryRepresentations.put(entry.getKey(), binaryRepresentations);
}
Map binaryRepresentations = new HashMap();
for (Class type : types) {
binaryRepresentations.put(TypeDescription.ForLoadedType.of(type), ClassFileLocator.ForClassLoader.read(type));
}
return ofTypes(binaryRepresentations, versionedBinaryRepresentations);
}
/**
* Represents a map of type names to their binary representation as an in-memory source.
*
* @param binaryRepresentations A mapping of type names to their binary representation.
* @return A source representing the supplied types.
*/
public static Source ofTypes(Map binaryRepresentations) {
return ofTypes(binaryRepresentations, Collections.>emptyMap());
}
/**
* Represents a map of type names to their binary representation as an in-memory source.
*
* @param binaryRepresentations A mapping of type names to their binary representation.
* @param versionedBinaryRepresentations A versioned mapping of type names to their binary representation.
* @return A source representing the supplied types.
*/
public static Source ofTypes(
Map binaryRepresentations,
Map> versionedBinaryRepresentations
) {
Map storage = new HashMap();
for (Map.Entry entry : binaryRepresentations.entrySet()) {
storage.put(entry.getKey().getInternalName() + ClassFileLocator.CLASS_FILE_EXTENSION, entry.getValue());
}
for (Map.Entry> versioned : versionedBinaryRepresentations.entrySet()) {
for (Map.Entry entry : versioned.getValue().entrySet()) {
storage.put(ClassFileLocator.META_INF_VERSIONS
+ versioned.getKey().getJavaVersion()
+ "/"
+ entry.getKey().getInternalName()
+ ClassFileLocator.CLASS_FILE_EXTENSION, entry.getValue());
}
}
return new InMemory(storage);
}
/**
* {@inheritDoc}
*/
public Origin read() {
return this;
}
/**
* {@inheritDoc}
*/
public ClassFileLocator toClassFileLocator(@MaybeNull ClassFileVersion classFileVersion) {
return ClassFileLocator.Simple.ofResources(storage);
}
/**
* {@inheritDoc}
*/
@MaybeNull
public Manifest getManifest() throws IOException {
byte[] binaryRepresentation = storage.get(JarFile.MANIFEST_NAME);
if (binaryRepresentation == null) {
return NO_MANIFEST;
} else {
return new Manifest(new ByteArrayInputStream(binaryRepresentation));
}
}
/**
* {@inheritDoc}
*/
public Iterator iterator() {
return new MapEntryIterator(storage.entrySet().iterator());
}
/**
* {@inheritDoc}
*/
public void close() {
/* do nothing */
}
/**
* An iterator that represents map entries as sources.
*/
protected static class MapEntryIterator implements Iterator {
/**
* The represented iterator.
*/
private final Iterator> iterator;
/**
* Creates a new map entry iterator.
*
* @param iterator The represented iterator.
*/
protected MapEntryIterator(Iterator> iterator) {
this.iterator = iterator;
}
/**
* {@inheritDoc}
*/
public boolean hasNext() {
return iterator.hasNext();
}
/**
* {@inheritDoc}
*/
public Element next() {
Map.Entry entry = iterator.next();
return new Element.ForByteArray(entry.getKey(), entry.getValue());
}
/**
* {@inheritDoc}
*/
public void remove() {
throw new UnsupportedOperationException("remove");
}
}
}
/**
* Represents the contents of a folder as class files.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForFolder implements Source, Origin {
/**
* The folder to represent.
*/
private final File folder;
/**
* Creates a new source representation for a given folder.
*
* @param folder The folder to represent.
*/
public ForFolder(File folder) {
this.folder = folder;
}
/**
* Initializes a reading from this source.
*
* @return A source that represents the resource of this origin.
*/
public Origin read() {
return this;
}
/**
* {@inheritDoc}
*/
public ClassFileLocator toClassFileLocator(@MaybeNull ClassFileVersion classFileVersion) throws IOException {
return classFileVersion == null
? new ClassFileLocator.ForFolder(folder)
: ClassFileLocator.ForFolder.of(folder, classFileVersion);
}
/**
* {@inheritDoc}
*/
@MaybeNull
public Manifest getManifest() throws IOException {
File file = new File(folder, JarFile.MANIFEST_NAME);
if (file.exists()) {
InputStream inputStream = new FileInputStream(file);
try {
return new Manifest(inputStream);
} finally {
inputStream.close();
}
} else {
return NO_MANIFEST;
}
}
/**
* {@inheritDoc}
*/
public Iterator iterator() {
return new FolderIterator(folder);
}
/**
* {@inheritDoc}
*/
public void close() {
/* do nothing */
}
/**
* An iterator that exposes all files within a folder structure as elements.
*/
protected class FolderIterator implements Iterator {
/**
* A list of files and folders to process with the next processed file at the end of the list.
*/
private final List files;
/**
* Creates a new iterator representation for all files within a folder.
*
* @param folder The root folder.
*/
protected FolderIterator(File folder) {
files = new ArrayList(Collections.singleton(folder));
File candidate;
do {
candidate = files.remove(files.size() - 1);
File[] file = candidate.listFiles();
if (file != null) {
files.addAll(Arrays.asList(file));
}
} while (!files.isEmpty() && (files.get(files.size() - 1).isDirectory() || files.get(files.size() - 1).equals(new File(folder, JarFile.MANIFEST_NAME))));
}
/**
* {@inheritDoc}
*/
public boolean hasNext() {
return !files.isEmpty();
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "IT_NO_SUCH_ELEMENT", justification = "Exception is thrown by invoking removeFirst on an empty list.")
public Element next() {
try {
return new Element.ForFile(folder, files.remove(files.size() - 1));
} finally {
while (!files.isEmpty() && (files.get(files.size() - 1).isDirectory() || files.get(files.size() - 1).equals(new File(folder, JarFile.MANIFEST_NAME)))) {
File folder = files.remove(files.size() - 1);
File[] file = folder.listFiles();
if (file != null) {
files.addAll(Arrays.asList(file));
}
}
}
}
/**
* {@inheritDoc}
*/
public void remove() {
throw new UnsupportedOperationException("remove");
}
}
}
/**
* Represents a jar file as a source.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForJarFile implements Source {
/**
* The jar file being represented by this source.
*/
private final File file;
/**
* Creates a new source for a jar file.
*
* @param file The jar file being represented by this source.
*/
public ForJarFile(File file) {
this.file = file;
}
/**
* {@inheritDoc}
*/
public Origin read() throws IOException {
return new Origin.ForJarFile(new JarFile(file, false));
}
}
/**
* A source that applies a filter upon iterating elements.
*/
@HashCodeAndEqualsPlugin.Enhance
class Filtering implements Source {
/**
* The source to which invocations are delegated.
*/
private final Source delegate;
/**
* The element matcher being used to filter elements.
*/
private final ElementMatcher matcher;
/**
* {@code true} if the manifest should be retained.
*/
private final boolean manifest;
/**
* Creates a new filtering source that retains the manifest of the delegated source.
*
* @param delegate The source to which invocations are delegated.
* @param matcher The element matcher being used to filter elements.
*/
public Filtering(Source delegate, ElementMatcher matcher) {
this(delegate, matcher, true);
}
/**
* Creates a new filtering source.
*
* @param delegate The source to which invocations are delegated.
* @param matcher The element matcher being used to filter elements.
* @param manifest {@code true} if the manifest should be retained.
*/
public Filtering(Source delegate, ElementMatcher matcher, boolean manifest) {
this.delegate = delegate;
this.matcher = matcher;
this.manifest = manifest;
}
/**
* Wraps a source to exclude elements that are above the specified Java version.
*
* @param delegate The delegate source.
* @param classFileVersion The latest multi-release Java version to retain from the source.
* @return A source that applies an appropriate filter.
*/
public static Source dropMultiReleaseClassFilesAbove(Source delegate, ClassFileVersion classFileVersion) {
return new Filtering(delegate, new MultiReleaseVersionMatcher(classFileVersion), true);
}
/**
* {@inheritDoc}
*/
public Origin read() throws IOException {
return new Origin.Filtering(delegate.read(), matcher, manifest);
}
/**
* An element matcher that filters multi-release files above a given version.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class MultiReleaseVersionMatcher implements ElementMatcher {
/**
* The latest version to consider.
*/
private final ClassFileVersion classFileVersion;
/**
* Creates a multi-release version matcher.
*
* @param classFileVersion The latest class file version to consider.
*/
protected MultiReleaseVersionMatcher(ClassFileVersion classFileVersion) {
this.classFileVersion = classFileVersion;
}
/**
* {@inheritDoc}
*/
public boolean matches(@MaybeNull Element target) {
if (target == null) {
return true;
}
String name = target.getName();
if (name.startsWith("/")) {
name = name.substring(1);
}
if (name.startsWith(ClassFileLocator.META_INF_VERSIONS)) {
int version;
try {
version = Integer.parseInt(name.substring(
ClassFileLocator.META_INF_VERSIONS.length(),
name.indexOf('/', ClassFileLocator.META_INF_VERSIONS.length())));
} catch (NumberFormatException ignored) {
return true;
}
return version <= classFileVersion.getJavaVersion();
}
return true;
}
}
}
}
/**
* A target for a plugin engine represents a sink container for all elements that are supplied by a {@link Source}.
*/
interface Target {
/**
* Initializes this target prior to writing.
*
* @param manifest The manifest for the target or {@code null} if no manifest was found.
* @return The sink to write to.
* @throws IOException If an I/O error occurs.
*/
Sink write(@MaybeNull Manifest manifest) throws IOException;
/**
* A sink represents an active writing process.
*/
interface Sink extends Closeable {
/**
* Stores the supplied binary representation of types in this sink.
*
* @param binaryRepresentations The binary representations to store.
* @throws IOException If an I/O error occurs.
*/
void store(Map binaryRepresentations) throws IOException;
/**
* Stores the supplied binary representation of types in this sink.
*
* @param classFileVersion The version of the multi-release jar file, which should at least be {@code 8} as previous
* versions are not recognized by regular class loaders.
* @param binaryRepresentations The binary representations to store.
* @throws IOException If an I/O error occurs.
*/
void store(ClassFileVersion classFileVersion, Map binaryRepresentations) throws IOException;
/**
* Retains the supplied element in its original form.
*
* @param element The element to retain.
* @throws IOException If an I/O error occurs.
*/
void retain(Source.Element element) throws IOException;
/**
* Implements a sink for a jar file.
*/
class ForJarOutputStream implements Sink {
/**
* The output stream to write to.
*/
private final JarOutputStream outputStream;
/**
* Creates a new sink for a jar file.
*
* @param outputStream The output stream to write to.
*/
public ForJarOutputStream(JarOutputStream outputStream) {
this.outputStream = outputStream;
}
/**
* {@inheritDoc}
*/
public void store(Map binaryRepresentations) throws IOException {
for (Map.Entry entry : binaryRepresentations.entrySet()) {
outputStream.putNextEntry(new JarEntry(entry.getKey().getInternalName() + ClassFileLocator.CLASS_FILE_EXTENSION));
outputStream.write(entry.getValue());
outputStream.closeEntry();
}
}
/**
* {@inheritDoc}
*/
public void store(ClassFileVersion classFileVersion, Map binaryRepresentations) throws IOException {
for (Map.Entry entry : binaryRepresentations.entrySet()) {
outputStream.putNextEntry(new JarEntry(ClassFileLocator.META_INF_VERSIONS
+ classFileVersion.getJavaVersion()
+ "/"
+ entry.getKey().getInternalName()
+ ClassFileLocator.CLASS_FILE_EXTENSION));
outputStream.write(entry.getValue());
outputStream.closeEntry();
}
}
/**
* {@inheritDoc}
*/
public void retain(Source.Element element) throws IOException {
JarEntry entry = element.resolveAs(JarEntry.class);
outputStream.putNextEntry(entry == null
? new JarEntry(element.getName())
: entry);
InputStream inputStream = element.getInputStream();
try {
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, length);
}
} finally {
inputStream.close();
}
outputStream.closeEntry();
}
/**
* {@inheritDoc}
*/
public void close() throws IOException {
outputStream.close();
}
}
}
/**
* A sink that discards any entry.
*/
enum Discarding implements Target, Sink {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public Sink write(@MaybeNull Manifest manifest) {
return this;
}
/**
* {@inheritDoc}
*/
public void store(Map binaryRepresentations) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void store(ClassFileVersion classFileVersion, Map binaryRepresentations) throws IOException {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void retain(Source.Element element) {
/* do nothing */
}
/**
* {@inheritDoc}
*/
public void close() {
/* do nothing */
}
}
/**
* A sink that stores all elements in a memory map.
*/
@HashCodeAndEqualsPlugin.Enhance
class InMemory implements Target, Sink {
/**
* The map for storing all elements being received.
*/
@HashCodeAndEqualsPlugin.Identity
private final Map storage;
/**
* Creates a new in-memory storage.
*/
public InMemory() {
this(new HashMap());
}
/**
* Creates a new in-memory storage.
*
* @param storage The map for storing all elements being received.
*/
public InMemory(Map storage) {
this.storage = storage;
}
/**
* {@inheritDoc}
*/
public Sink write(@MaybeNull Manifest manifest) throws IOException {
if (manifest != null) {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
try {
manifest.write(outputStream);
} finally {
outputStream.close();
}
storage.put(JarFile.MANIFEST_NAME, outputStream.toByteArray());
}
return this;
}
/**
* {@inheritDoc}
*/
public void store(Map binaryRepresentations) {
for (Map.Entry entry : binaryRepresentations.entrySet()) {
storage.put(entry.getKey().getInternalName() + ClassFileLocator.CLASS_FILE_EXTENSION, entry.getValue());
}
}
/**
* {@inheritDoc}
*/
public void store(ClassFileVersion classFileVersion, Map binaryRepresentations) throws IOException {
for (Map.Entry entry : binaryRepresentations.entrySet()) {
storage.put(ClassFileLocator.META_INF_VERSIONS
+ classFileVersion.getJavaVersion()
+ "/"
+ entry.getKey().getInternalName()
+ ClassFileLocator.CLASS_FILE_EXTENSION, entry.getValue());
}
}
/**
* {@inheritDoc}
*/
public void retain(Source.Element element) throws IOException {
String name = element.getName();
if (!name.endsWith("/")) {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
try {
InputStream inputStream = element.getInputStream();
try {
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, length);
}
} finally {
inputStream.close();
}
} finally {
outputStream.close();
}
storage.put(element.getName(), outputStream.toByteArray());
}
}
/**
* {@inheritDoc}
*/
public void close() {
/* do nothing */
}
/**
* Returns the in-memory storage.
*
* @return The in-memory storage.
*/
public Map getStorage() {
return storage;
}
/**
* Returns the in-memory storage as a type-map where all non-class files are discarded.
*
* @return The in-memory storage as a type map.
*/
public Map toTypeMap() {
Map binaryRepresentations = new HashMap();
for (Map.Entry entry : storage.entrySet()) {
if (entry.getKey().endsWith(ClassFileLocator.CLASS_FILE_EXTENSION) && !entry.getKey().startsWith(ClassFileLocator.META_INF_VERSIONS)) {
binaryRepresentations.put(entry.getKey()
.substring(0, entry.getKey().length() - ClassFileLocator.CLASS_FILE_EXTENSION.length())
.replace('/', '.'), entry.getValue());
}
}
return binaryRepresentations;
}
/**
* Returns the in-memory storage as a type-map where all non-class files are discarded.
*
* @param classFileVersion The class file version to consider when encountering multi-release class files.
* @return The in-memory storage as a type map.
*/
public Map toTypeMap(ClassFileVersion classFileVersion) {
Map binaryRepresentations = new HashMap();
Map versions = new HashMap();
for (Map.Entry entry : storage.entrySet()) {
if (entry.getKey().endsWith(ClassFileLocator.CLASS_FILE_EXTENSION)) {
String suffix;
int version;
if (entry.getKey().startsWith(ClassFileLocator.META_INF_VERSIONS)) {
suffix = entry.getKey().substring(entry.getKey().indexOf('/', ClassFileLocator.META_INF_VERSIONS.length()) + 1);
try {
int candidate = Integer.parseInt(entry.getKey().substring(ClassFileLocator.META_INF_VERSIONS.length(), entry.getKey().indexOf('/', ClassFileLocator.META_INF_VERSIONS.length())));
if (candidate < 7 || candidate > classFileVersion.getJavaVersion()) {
continue;
}
version = candidate;
} catch (NumberFormatException ignored) {
continue;
}
} else {
suffix = entry.getKey();
version = 0;
}
Integer current = versions.get(suffix);
if (current == null || current < version) {
versions.put(suffix, version);
binaryRepresentations.put(suffix
.substring(0, suffix.length() - ClassFileLocator.CLASS_FILE_EXTENSION.length())
.replace('/', '.'), entry.getValue());
}
}
}
return binaryRepresentations;
}
}
/**
* Represents a folder as the target for a plugin engine's application.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForFolder implements Target, Sink {
/**
* The folder that is represented by this instance.
*/
private final File folder;
/**
* Creates a new target for a folder.
*
* @param folder The folder that is represented by this instance.
*/
public ForFolder(File folder) {
this.folder = folder;
}
/**
* Stores binary representations to a folder.
*
* @param folder The base folder.
* @param binaryRepresentations The binary representations to store.
* @throws IOException If an I/O exception occurs.
*/
private static void doStore(File folder, Map binaryRepresentations) throws IOException {
for (Map.Entry entry : binaryRepresentations.entrySet()) {
File target = new File(folder, entry.getKey().getInternalName() + ClassFileLocator.CLASS_FILE_EXTENSION);
if (!target.getParentFile().isDirectory() && !target.getParentFile().mkdirs()) {
throw new IOException("Could not create directory: " + target.getParent());
}
OutputStream outputStream = new FileOutputStream(target);
try {
outputStream.write(entry.getValue());
} finally {
outputStream.close();
}
}
}
/**
* {@inheritDoc}
*/
public Sink write(@MaybeNull Manifest manifest) throws IOException {
if (manifest != null) {
File target = new File(folder, JarFile.MANIFEST_NAME);
if (!target.getParentFile().isDirectory() && !target.getParentFile().mkdirs()) {
throw new IOException("Could not create directory: " + target.getParent());
}
OutputStream outputStream = new FileOutputStream(target);
try {
manifest.write(outputStream);
} finally {
outputStream.close();
}
}
return this;
}
/**
* {@inheritDoc}
*/
public void store(Map binaryRepresentations) throws IOException {
doStore(folder, binaryRepresentations);
}
/**
* {@inheritDoc}
*/
public void store(ClassFileVersion classFileVersion, Map binaryRepresentations) throws IOException {
doStore(new File(folder, ClassFileLocator.META_INF_VERSIONS + classFileVersion.getJavaVersion()), binaryRepresentations);
}
/**
* {@inheritDoc}
*/
public void retain(Source.Element element) throws IOException {
String name = element.getName();
if (!name.endsWith("/")) {
File target = new File(folder, name), resolved = element.resolveAs(File.class);
if (!target.getCanonicalPath().startsWith(folder.getCanonicalPath() + File.separatorChar)) {
throw new IllegalArgumentException(target + " is not a subdirectory of " + folder);
} else if (!target.getParentFile().isDirectory() && !target.getParentFile().mkdirs()) {
throw new IOException("Could not create directory: " + target.getParent());
} else if (resolved != null && !resolved.equals(target)) {
FileSystem.getInstance().copy(resolved, target);
} else if (!target.equals(resolved)) {
InputStream inputStream = element.getInputStream();
try {
OutputStream outputStream = new FileOutputStream(target);
try {
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, length);
}
} finally {
outputStream.close();
}
} finally {
inputStream.close();
}
}
}
}
/**
* {@inheritDoc}
*/
public void close() {
/* do nothing */
}
}
/**
* Represents a jar file as a target.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForJarFile implements Target {
/**
* The jar file that is represented by this target.
*/
private final File file;
/**
* Creates a new target for a jar file.
*
* @param file The jar file that is represented by this target.
*/
public ForJarFile(File file) {
this.file = file;
}
/**
* {@inheritDoc}
*/
public Sink write(@MaybeNull Manifest manifest) throws IOException {
return manifest == null
? new Sink.ForJarOutputStream(new JarOutputStream(new FileOutputStream(file)))
: new Sink.ForJarOutputStream(new JarOutputStream(new FileOutputStream(file), manifest));
}
}
}
/**
* A dispatcher to execute a plugin engine transformation. A dispatcher will receive all work assignments prior to the invocation
* of complete. After registering and eventually completing the supplied work, the close method will always be called. Any dispatcher
* will only be used once and from a single thread.
*/
interface Dispatcher extends Closeable {
/**
* Accepts a new work assignment.
*
* @param work The work to handle prefixed by a preprocessing step.
* @param eager {@code true} if the processing does not need to be deferred until all preprocessing is complete.
* @throws IOException If an I/O exception occurs.
*/
void accept(Callable> work, boolean eager) throws IOException;
/**
* Completes the work being handled.
*
* @throws IOException If an I/O exception occurs.
*/
void complete() throws IOException;
/**
* The result of a work assignment that needs to be invoked from the main thread that triggers a dispatchers life-cycle methods.
*/
interface Materializable {
/**
* Materializes this work result and adds any results to the corresponding collection.
*
* @param sink The sink to write any work to.
* @param transformed A list of all types that are transformed.
* @param failed A mapping of all types that failed during transformation to the exceptions that explain the failure.
* @param unresolved A list of type names that could not be resolved.
* @throws IOException If an I/O exception occurs.
*/
void materialize(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) throws IOException;
/**
* A materializable for a successfully transformed type.
*/
class ForTransformedElement implements Materializable {
/**
* The multi-release class file version number or {@code null} if a regular class.
*/
@MaybeNull
private final ClassFileVersion classFileVersion;
/**
* The type that has been transformed.
*/
private final DynamicType dynamicType;
/**
* Creates a new materializable for a successfully transformed type.
*
* @param classFileVersion The multi-release class file version number or {@code null} if a regular class.
* @param dynamicType The type that has been transformed.
*/
protected ForTransformedElement(@MaybeNull ClassFileVersion classFileVersion, DynamicType dynamicType) {
this.classFileVersion = classFileVersion;
this.dynamicType = dynamicType;
}
/**
* {@inheritDoc}
*/
public void materialize(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) throws IOException {
if (classFileVersion == null) {
sink.store(dynamicType.getAllTypes());
} else {
sink.store(classFileVersion, dynamicType.getAllTypes());
}
transformed.add(dynamicType.getTypeDescription());
}
}
/**
* A materializable for an element that is retained in its original state.
*/
class ForRetainedElement implements Materializable {
/**
* The retained element.
*/
private final Source.Element element;
/**
* Creates a new materializable for a retained element.
*
* @param element The retained element.
*/
protected ForRetainedElement(Source.Element element) {
this.element = element;
}
/**
* {@inheritDoc}
*/
public void materialize(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) throws IOException {
sink.retain(element);
}
}
/**
* A materializable for an element that failed to be transformed.
*/
class ForFailedElement implements Materializable {
/**
* The element for which the transformation failed.
*/
private final Source.Element element;
/**
* The type description for the represented type.
*/
private final TypeDescription typeDescription;
/**
* A non-empty list of errors that occurred when attempting the transformation.
*/
private final List errored;
/**
* Creates a new materializable for an element that failed to be transformed.
*
* @param element The element for which the transformation failed.
* @param typeDescription The type description for the represented type.
* @param errored A non-empty list of errors that occurred when attempting the transformation.
*/
protected ForFailedElement(Source.Element element, TypeDescription typeDescription, List errored) {
this.element = element;
this.typeDescription = typeDescription;
this.errored = errored;
}
/**
* {@inheritDoc}
*/
public void materialize(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) throws IOException {
sink.retain(element);
failed.put(typeDescription, errored);
}
}
/**
* A materializable for an element that could not be resolved.
*/
class ForUnresolvedElement implements Materializable {
/**
* The element that could not be resolved.
*/
private final Source.Element element;
/**
* The name of the type that was deducted for this element.
*/
private final String typeName;
/**
* Creates a new materializable for an element that could not be resolved.
*
* @param element The element that could not be resolved.
* @param typeName The name of the type that was deducted for this element.
*/
protected ForUnresolvedElement(Source.Element element, String typeName) {
this.element = element;
this.typeName = typeName;
}
/**
* {@inheritDoc}
*/
public void materialize(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) throws IOException {
sink.retain(element);
unresolved.add(typeName);
}
}
}
/**
* A factory that is used for creating a dispatcher that is used for a specific plugin engine application.
*/
interface Factory {
/**
* Creates a new dispatcher.
*
* @param sink The sink to write any work to.
* @param transformed A list of all types that are transformed.
* @param failed A mapping of all types that failed during transformation to the exceptions that explain the failure.
* @param unresolved A list of type names that could not be resolved.
* @return The dispatcher to use.
*/
Dispatcher make(Target.Sink sink,
List transformed,
Map> failed,
List unresolved);
}
/**
* A dispatcher that applies transformation upon discovery.
*/
class ForSerialTransformation implements Dispatcher {
/**
* The sink to write any work to.
*/
private final Target.Sink sink;
/**
* A list of all types that are transformed.
*/
private final List transformed;
/**
* A mapping of all types that failed during transformation to the exceptions that explain the failure.
*/
private final Map> failed;
/**
* A list of type names that could not be resolved.
*/
private final List unresolved;
/**
* A list of deferred processings.
*/
private final List> preprocessings;
/**
* Creates a dispatcher for a serial transformation.
*
* @param sink The sink to write any work to.
* @param transformed A list of all types that are transformed.
* @param failed A mapping of all types that failed during transformation to the exceptions that explain the failure.
* @param unresolved A list of type names that could not be resolved.
*/
protected ForSerialTransformation(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) {
this.sink = sink;
this.transformed = transformed;
this.failed = failed;
this.unresolved = unresolved;
preprocessings = new ArrayList>();
}
/**
* {@inheritDoc}
*/
public void accept(Callable> work, boolean eager) throws IOException {
try {
Callable preprocessed = work.call();
if (eager) {
preprocessed.call().materialize(sink, transformed, failed, unresolved);
} else {
preprocessings.add(preprocessed);
}
} catch (Exception exception) {
if (exception instanceof IOException) {
throw (IOException) exception;
} else if (exception instanceof RuntimeException) {
throw (RuntimeException) exception;
} else {
throw new IllegalStateException(exception);
}
}
}
/**
* {@inheritDoc}
*/
public void complete() throws IOException {
for (Callable preprocessing : preprocessings) {
if (Thread.interrupted()) {
Thread.currentThread().interrupt();
throw new IllegalStateException("Interrupted during plugin engine completion");
}
try {
preprocessing.call().materialize(sink, transformed, failed, unresolved);
} catch (Exception exception) {
if (exception instanceof IOException) {
throw (IOException) exception;
} else if (exception instanceof RuntimeException) {
throw (RuntimeException) exception;
} else {
throw new IllegalStateException(exception);
}
}
}
}
/**
* {@inheritDoc}
*/
public void close() {
/* do nothing */
}
/**
* A factory for creating a serial dispatcher.
*/
public enum Factory implements Dispatcher.Factory {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public Dispatcher make(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) {
return new ForSerialTransformation(sink, transformed, failed, unresolved);
}
}
}
/**
* A dispatcher that applies transformations within one or more threads in parallel to the default transformer.
*/
class ForParallelTransformation implements Dispatcher {
/**
* The target sink.
*/
private final Target.Sink sink;
/**
* A list of all types that are transformed.
*/
private final List transformed;
/**
* A mapping of all types that failed during transformation to the exceptions that explain the failure.
*/
private final Map> failed;
/**
* A list of type names that could not be resolved.
*/
private final List unresolved;
/**
* A completion service for all preprocessings.
*/
private final CompletionService> preprocessings;
/**
* A completion service for all materializers.
*/
private final CompletionService materializers;
/**
* A count of deferred processings.
*/
private int deferred;
/**
* A collection of futures that are currently scheduled.
*/
private final Set> futures;
/**
* Creates a new dispatcher that applies transformations in parallel.
*
* @param executor The executor to delegate any work to.
* @param sink The target sink.
* @param transformed A list of all types that are transformed.
* @param failed A mapping of all types that failed during transformation to the exceptions that explain the failure.
* @param unresolved A list of type names that could not be resolved.
*/
protected ForParallelTransformation(Executor executor,
Target.Sink sink,
List transformed,
Map> failed,
List unresolved) {
this.sink = sink;
this.transformed = transformed;
this.failed = failed;
this.unresolved = unresolved;
preprocessings = new ExecutorCompletionService>(executor);
materializers = new ExecutorCompletionService(executor);
futures = new HashSet>();
}
/**
* {@inheritDoc}
*/
@SuppressWarnings("unchecked")
public void accept(Callable> work, boolean eager) {
if (eager) {
futures.add(materializers.submit(new EagerWork(work)));
} else {
deferred += 1;
futures.add(preprocessings.submit((Callable>) work));
}
}
/**
* {@inheritDoc}
*/
public void complete() throws IOException {
try {
List> preprocessings = new ArrayList>(deferred);
while (deferred-- > 0) {
Future> future = this.preprocessings.take();
futures.remove(future);
preprocessings.add(future.get());
}
for (Callable preprocessing : preprocessings) {
futures.add(materializers.submit(preprocessing));
}
while (!futures.isEmpty()) {
Future future = materializers.take();
futures.remove(future);
future.get().materialize(sink, transformed, failed, unresolved);
}
} catch (InterruptedException exception) {
Thread.currentThread().interrupt();
throw new IllegalStateException(exception);
} catch (ExecutionException exception) {
Throwable cause = exception.getCause();
if (cause instanceof IOException) {
throw (IOException) cause;
} else if (cause instanceof RuntimeException) {
throw (RuntimeException) cause;
} else if (cause instanceof Error) {
throw (Error) cause;
} else {
throw new IllegalStateException(cause);
}
}
}
/**
* {@inheritDoc}
*/
public void close() {
for (Future future : futures) {
future.cancel(true);
}
}
/**
* A parallel dispatcher that shuts down its executor service upon completion of a plugin engine's application.
*/
@HashCodeAndEqualsPlugin.Enhance
public static class WithThrowawayExecutorService extends ForParallelTransformation {
/**
* The executor service to delegate any work to.
*/
private final ExecutorService executorService;
/**
* Creates a new dispatcher that applies transformations in parallel and that closes the supplies executor service.
*
* @param executorService The executor service to delegate any work to.
* @param sink The target sink.
* @param transformed A list of all types that are transformed.
* @param failed A mapping of all types that failed during transformation to the exceptions that explain the failure.
* @param unresolved A list of type names that could not be resolved.
*/
protected WithThrowawayExecutorService(ExecutorService executorService,
Target.Sink sink,
List transformed,
Map> failed,
List unresolved) {
super(executorService, sink, transformed, failed, unresolved);
this.executorService = executorService;
}
@Override
public void close() {
try {
super.close();
} finally {
executorService.shutdown();
}
}
/**
* A factory for a parallel executor service that creates a new executor service on each plugin engine application.
*/
@HashCodeAndEqualsPlugin.Enhance
public static class Factory implements Dispatcher.Factory {
/**
* The amount of threads to create in the throw-away executor service.
*/
private final int threads;
/**
* Creates a new factory.
*
* @param threads The amount of threads to create in the throw-away executor service.
*/
public Factory(int threads) {
this.threads = threads;
}
/**
* {@inheritDoc}
*/
public Dispatcher make(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) {
return new WithThrowawayExecutorService(Executors.newFixedThreadPool(threads), sink, transformed, failed, unresolved);
}
}
}
/**
* A factory for a dispatcher that uses a given executor service for parallel dispatching.
*/
@HashCodeAndEqualsPlugin.Enhance
public static class Factory implements Dispatcher.Factory {
/**
* The executor to use.
*/
private final Executor executor;
/**
* Creates a new dispatcher factory for parallel dispatching using the supplied executor.
*
* @param executor The executor to use.
*/
public Factory(Executor executor) {
this.executor = executor;
}
/**
* {@inheritDoc}
*/
public Dispatcher make(Target.Sink sink,
List transformed,
Map> failed,
List unresolved) {
return new ForParallelTransformation(executor, sink, transformed, failed, unresolved);
}
}
/**
* An eager materialization that does not defer processing after preprocessing.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class EagerWork implements Callable {
/**
* The work to apply.
*/
private final Callable> work;
/**
* Creates an eager work resolution.
*
* @param work The work to apply.
*/
protected EagerWork(Callable> work) {
this.work = work;
}
/**
* {@inheritDoc}
*/
public Materializable call() throws Exception {
return work.call().call();
}
}
}
}
/**
* A summary of the application of a {@link Engine} to a source and target.
*/
class Summary {
/**
* A list of all types that were transformed.
*/
private final List transformed;
/**
* A mapping of all types that failed during transformation to the exceptions that explain the failure.
*/
private final Map> failed;
/**
* A list of type names that could not be resolved.
*/
private final List unresolved;
/**
* Creates a new summary.
*
* @param transformed A list of all types that were transformed.
* @param failed A mapping of all types that failed during transformation to the exceptions that explain the failure.
* @param unresolved A list of type names that could not be resolved.
*/
public Summary(List transformed, Map> failed, List unresolved) {
this.transformed = transformed;
this.failed = failed;
this.unresolved = unresolved;
}
/**
* Returns a list of all types that were transformed.
*
* @return A list of all types that were transformed.
*/
public List getTransformed() {
return transformed;
}
/**
* Returns a mapping of all types that failed during transformation to the exceptions that explain the failure.
*
* @return A mapping of all types that failed during transformation to the exceptions that explain the failure.
*/
public Map> getFailed() {
return failed;
}
/**
* Returns a list of type names that could not be resolved.
*
* @return A list of type names that could not be resolved.
*/
public List getUnresolved() {
return unresolved;
}
@Override
public int hashCode() {
int result = transformed.hashCode();
result = 31 * result + failed.hashCode();
result = 31 * result + unresolved.hashCode();
return result;
}
@Override
public boolean equals(@MaybeNull Object other) {
if (this == other) {
return true;
} else if (other == null || getClass() != other.getClass()) {
return false;
}
Summary summary = (Summary) other;
return transformed.equals(summary.transformed)
&& failed.equals(summary.failed)
&& unresolved.equals(summary.unresolved);
}
}
/**
* An abstract base implementation of a plugin engine.
*/
abstract class AbstractBase implements Engine {
/**
* {@inheritDoc}
*/
public Engine withErrorHandlers(ErrorHandler... errorHandler) {
return withErrorHandlers(Arrays.asList(errorHandler));
}
/**
* {@inheritDoc}
*/
public Engine withParallelTransformation(int threads) {
if (threads < 1) {
throw new IllegalArgumentException("Number of threads must be positive: " + threads);
}
return with(new Dispatcher.ForParallelTransformation.WithThrowawayExecutorService.Factory(threads));
}
/**
* {@inheritDoc}
*/
public Summary apply(File source, File target, Factory... factory) throws IOException {
return apply(source, target, Arrays.asList(factory));
}
/**
* {@inheritDoc}
*/
public Summary apply(File source, File target, List factories) throws IOException {
return apply(source.isDirectory()
? new Source.ForFolder(source)
: new Source.ForJarFile(source), target.isDirectory()
? new Target.ForFolder(target)
: new Target.ForJarFile(target), factories);
}
/**
* {@inheritDoc}
*/
public Summary apply(Source source, Target target, Factory... factory) throws IOException {
return apply(source, target, Arrays.asList(factory));
}
}
/**
* A default implementation of a plugin engine.
*/
@HashCodeAndEqualsPlugin.Enhance
class Default extends AbstractBase {
/**
* The Byte Buddy instance to use.
*/
private final ByteBuddy byteBuddy;
/**
* The type strategy to use.
*/
private final TypeStrategy typeStrategy;
/**
* The pool strategy to use.
*/
private final PoolStrategy poolStrategy;
/**
* The class file locator to use.
*/
private final ClassFileLocator classFileLocator;
/**
* The class file version to use for multi-release jars, or {@code null}.
*/
@MaybeNull
@HashCodeAndEqualsPlugin.ValueHandling(HashCodeAndEqualsPlugin.ValueHandling.Sort.REVERSE_NULLABILITY)
private final ClassFileVersion classFileVersion;
/**
* The listener to use.
*/
private final Listener listener;
/**
* The error handler to use.
*/
private final ErrorHandler errorHandler;
/**
* The dispatcher factory to use.
*/
private final Dispatcher.Factory dispatcherFactory;
/**
* A matcher for types to exclude from transformation.
*/
private final ElementMatcher.Junction ignoredTypeMatcher;
/**
* Creates a new default plugin engine that rebases types and fails fast and on unresolved types and on live initializers.
*/
public Default() {
this(new ByteBuddy());
}
/**
* Creates a new default plugin engine that rebases types and fails fast and on unresolved types and on live initializers.
*
* @param byteBuddy The Byte Buddy instance to use.
*/
public Default(ByteBuddy byteBuddy) {
this(byteBuddy, TypeStrategy.Default.REBASE);
}
/**
* Creates a new default plugin engine.
*
* @param byteBuddy The Byte Buddy instance to use.
* @param typeStrategy The type strategy to use.
*/
protected Default(ByteBuddy byteBuddy, TypeStrategy typeStrategy) {
this(byteBuddy,
typeStrategy,
PoolStrategy.Default.FAST,
ClassFileLocator.NoOp.INSTANCE,
null,
Listener.NoOp.INSTANCE,
new ErrorHandler.Compound(ErrorHandler.Failing.FAIL_FAST,
ErrorHandler.Enforcing.ALL_TYPES_RESOLVED,
ErrorHandler.Enforcing.NO_LIVE_INITIALIZERS),
Dispatcher.ForSerialTransformation.Factory.INSTANCE,
none());
}
/**
* Creates a new default plugin engine.
*
* @param byteBuddy The Byte Buddy instance to use.
* @param typeStrategy The type strategy to use.
* @param poolStrategy The pool strategy to use.
* @param classFileLocator The class file locator to use.
* @param classFileVersion The class file version to use for multi-release jars, or {@code null}.
* @param listener The listener to use.
* @param errorHandler The error handler to use.
* @param dispatcherFactory The dispatcher factory to use.
* @param ignoredTypeMatcher A matcher for types to exclude from transformation.
*/
protected Default(ByteBuddy byteBuddy,
TypeStrategy typeStrategy,
PoolStrategy poolStrategy,
ClassFileLocator classFileLocator,
@MaybeNull ClassFileVersion classFileVersion,
Listener listener,
ErrorHandler errorHandler,
Dispatcher.Factory dispatcherFactory,
ElementMatcher.Junction ignoredTypeMatcher) {
this.byteBuddy = byteBuddy;
this.typeStrategy = typeStrategy;
this.poolStrategy = poolStrategy;
this.classFileLocator = classFileLocator;
this.classFileVersion = classFileVersion;
this.listener = listener;
this.errorHandler = errorHandler;
this.dispatcherFactory = dispatcherFactory;
this.ignoredTypeMatcher = ignoredTypeMatcher;
}
/**
* Creates a plugin engine from an {@link EntryPoint}.
*
* @param entryPoint The entry point to resolve into a plugin engine.
* @param classFileVersion The class file version to assume.
* @param methodNameTransformer The method name transformer to use.
* @return An appropriate plugin engine.
*/
public static Engine of(EntryPoint entryPoint, ClassFileVersion classFileVersion, MethodNameTransformer methodNameTransformer) {
return new Default(entryPoint.byteBuddy(classFileVersion), new TypeStrategy.ForEntryPoint(entryPoint, methodNameTransformer));
}
/**
* Scans a class loader for plugins declared in a META-INF/net.bytebuddy/build.plugins file.
*
* @param classLoader The class loader to scan.
* @return A set containing all plugins that were found.
* @throws IOException If an I/O exception occurred.
*/
public static Set scan(ClassLoader classLoader) throws IOException {
Set plugins = new HashSet();
Enumeration enumeration = classLoader.getResources(PLUGIN_FILE);
while (enumeration.hasMoreElements()) {
BufferedReader reader = new BufferedReader(new InputStreamReader(enumeration.nextElement().openStream(), "UTF-8"));
try {
String line;
while ((line = reader.readLine()) != null) {
plugins.add(line);
}
} finally {
reader.close();
}
}
return plugins;
}
/**
* Runs a plugin engine using the first and second argument as source and target file location and any additional argument as
* the fully qualified name of any plugin to apply.
*
* @param argument The arguments for running the plugin engine.
* @throws ClassNotFoundException If a plugin class cannot be found on the system class loader.
* @throws IOException If an I/O exception occurs.
*/
@SuppressWarnings("unchecked")
public static void main(String... argument) throws ClassNotFoundException, IOException {
if (argument.length < 2) {
throw new IllegalArgumentException("Expected arguments: [, ...]");
}
List factories = new ArrayList(argument.length - 2);
for (String plugin : Arrays.asList(argument).subList(2, argument.length)) {
factories.add(new Factory.UsingReflection((Class) Class.forName(plugin)));
}
new Default().apply(new File(argument[0]), new File(argument[1]), factories);
}
/**
* {@inheritDoc}
*/
public Engine with(ByteBuddy byteBuddy) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
listener,
errorHandler,
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine with(TypeStrategy typeStrategy) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
listener,
errorHandler,
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine with(PoolStrategy poolStrategy) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
listener,
errorHandler,
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine with(ClassFileLocator classFileLocator) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
new ClassFileLocator.Compound(this.classFileLocator, classFileLocator),
classFileVersion,
listener,
errorHandler,
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine with(@MaybeNull ClassFileVersion classFileVersion) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
listener,
errorHandler,
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine with(Listener listener) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
new Listener.Compound(this.listener, listener),
errorHandler,
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine withoutErrorHandlers() {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
listener,
Listener.NoOp.INSTANCE,
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine withErrorHandlers(List errorHandlers) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
listener,
new ErrorHandler.Compound(errorHandlers),
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine with(Dispatcher.Factory dispatcherFactory) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
listener,
errorHandler,
dispatcherFactory,
ignoredTypeMatcher);
}
/**
* {@inheritDoc}
*/
public Engine ignore(ElementMatcher matcher) {
return new Default(byteBuddy,
typeStrategy,
poolStrategy,
classFileLocator,
classFileVersion,
listener,
errorHandler,
dispatcherFactory,
ignoredTypeMatcher.or(matcher));
}
/**
* {@inheritDoc}
*/
public Summary apply(Source source, Target target, List factories) throws IOException {
Listener listener = new Listener.Compound(this.listener, new Listener.ForErrorHandler(errorHandler));
List transformed = new ArrayList();
Map> failed = new LinkedHashMap>();
List unresolved = new ArrayList();
Throwable rethrown = null;
List plugins = new ArrayList(factories.size());
List initializers = new ArrayList();
List preprocessors = new ArrayList();
try {
for (Plugin.Factory factory : factories) {
Plugin plugin = factory.make();
plugins.add(plugin);
if (plugin instanceof WithPreprocessor) {
preprocessors.add((WithPreprocessor) plugin);
}
if (plugin instanceof WithInitialization) {
initializers.add((WithInitialization) plugin);
}
}
Source.Origin origin = source.read();
try {
ClassFileLocator classFileLocator = new ClassFileLocator.Compound(origin.toClassFileLocator(classFileVersion), this.classFileLocator);
TypePool typePool = poolStrategy.typePool(classFileLocator);
Manifest manifest = origin.getManifest();
listener.onManifest(manifest);
Target.Sink sink = target.write(manifest);
try {
for (WithInitialization initializer : initializers) {
sink.store(initializer.initialize(classFileLocator));
}
Dispatcher dispatcher = dispatcherFactory.make(sink, transformed, failed, unresolved);
try {
for (Source.Element element : origin) {
if (Thread.interrupted()) {
Thread.currentThread().interrupt();
throw new IllegalStateException("Thread interrupted during plugin engine application");
}
String name = element.getName();
while (name.startsWith("/")) {
name = name.substring(1);
}
if (name.endsWith(ClassFileLocator.CLASS_FILE_EXTENSION)
&& (!name.startsWith("META-INF") || name.startsWith(ClassFileLocator.META_INF_VERSIONS))
&& !name.endsWith(PACKAGE_INFO)
&& !name.endsWith(MODULE_INFO)) {
try {
ClassFileVersion classFileVersion = name.startsWith(ClassFileLocator.META_INF_VERSIONS)
? ClassFileVersion.ofJavaVersion(Integer.parseInt(name.substring(ClassFileLocator.META_INF_VERSIONS.length(), name.indexOf('/', ClassFileLocator.META_INF_VERSIONS.length()))))
: null;
if (classFileVersion == null || classFileVersion.isAtLeast(ClassFileVersion.JAVA_V8)
&& this.classFileVersion != null
&& this.classFileVersion.isAtLeast(ClassFileVersion.JAVA_V9)
&& classFileVersion.isAtMost(this.classFileVersion)) {
String typeName = name.substring(name.startsWith(ClassFileLocator.META_INF_VERSIONS)
? name.indexOf('/', ClassFileLocator.META_INF_VERSIONS.length()) + 1
: 0, name.length() - ClassFileLocator.CLASS_FILE_EXTENSION.length()).replace('/', '.');
dispatcher.accept(new Preprocessor(element,
typeName,
new SourceEntryPrependingClassFileLocator(typeName, element, classFileLocator),
classFileVersion,
typePool,
listener,
plugins,
preprocessors), preprocessors.isEmpty());
} else {
listener.onResource(name);
sink.retain(element);
}
} catch (NumberFormatException ignored) {
listener.onResource(name);
sink.retain(element);
}
} else if (!name.equals(JarFile.MANIFEST_NAME)) {
listener.onResource(name);
sink.retain(element);
}
}
dispatcher.complete();
} finally {
dispatcher.close();
}
if (!failed.isEmpty()) {
listener.onError(failed);
}
} finally {
sink.close();
}
} finally {
origin.close();
}
} finally {
for (Plugin plugin : plugins) {
try {
plugin.close();
} catch (Throwable throwable) {
try {
listener.onError(plugin, throwable);
} catch (Throwable chained) {
rethrown = rethrown == null
? chained
: rethrown;
}
}
}
}
if (rethrown == null) {
return new Summary(transformed, failed, unresolved);
} else if (rethrown instanceof IOException) {
throw (IOException) rethrown;
} else if (rethrown instanceof RuntimeException) {
throw (RuntimeException) rethrown;
} else {
throw new IllegalStateException(rethrown);
}
}
/**
* A class file locator that shadows a given {@link Source.Element}'s type with the explicit element.
* This avoids that caching yields the wrong class file in case of multi-release jars.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class SourceEntryPrependingClassFileLocator implements ClassFileLocator {
/**
* The name of the represented type.
*/
private final String name;
/**
* The corresponding source element.
*/
private final Source.Element element;
/**
* The actual class file locator to query for all other types.
*/
private final ClassFileLocator delegate;
/**
* Creates a class file locator that prepends a {@link Source.Element}.
*
* @param name The name of the represented type.
* @param element The corresponding source element.
* @param delegate The actual class file locator to query for all other types.
*/
protected SourceEntryPrependingClassFileLocator(String name, Source.Element element, ClassFileLocator delegate) {
this.name = name;
this.element = element;
this.delegate = delegate;
}
/**
* {@inheritDoc}
*/
public Resolution locate(String name) throws IOException {
if (name.endsWith(this.name)) {
InputStream inputStream = element.getInputStream();
try {
return new Resolution.Explicit(StreamDrainer.DEFAULT.drain(inputStream));
} finally {
inputStream.close();
}
} else {
return delegate.locate(name);
}
}
/**
* {@inheritDoc}
*/
public void close() throws IOException {
delegate.close();
}
}
/**
* A preprocessor for a parallel plugin engine.
*/
private class Preprocessor implements Callable> {
/**
* The processed element.
*/
private final Source.Element element;
/**
* The name of the processed type.
*/
private final String typeName;
/**
* The class file locator to use.
*/
private final ClassFileLocator classFileLocator;
/**
* The multi-release class file version or {@code null} for a regular class.
*/
@MaybeNull
@HashCodeAndEqualsPlugin.ValueHandling(HashCodeAndEqualsPlugin.ValueHandling.Sort.REVERSE_NULLABILITY)
private final ClassFileVersion classFileVersion;
/**
* The type pool to use.
*/
private final TypePool typePool;
/**
* The listener to notify.
*/
private final Listener listener;
/**
* The plugins to apply.
*/
private final List plugins;
/**
* The plugins with preprocessors to preprocess.
*/
private final List preprocessors;
/**
* Creates a new preprocessor.
*
* @param element The processed element.
* @param typeName The name of the processed type.
* @param classFileLocator The class file locator to use.
* @param classFileVersion The multi-release class file version or {@code null} for a regular class.
* @param typePool The type pool to use.
* @param listener The listener to notify.
* @param plugins The plugins to apply.
* @param preprocessors The plugins with preprocessors to preprocess.
*/
private Preprocessor(Source.Element element,
String typeName,
ClassFileLocator classFileLocator,
@MaybeNull ClassFileVersion classFileVersion,
TypePool typePool,
Listener listener,
List plugins,
List preprocessors) {
this.element = element;
this.typeName = typeName;
this.classFileLocator = classFileLocator;
this.classFileVersion = classFileVersion;
this.typePool = typePool;
this.listener = listener;
this.plugins = plugins;
this.preprocessors = preprocessors;
}
/**
* {@inheritDoc}
*/
public Callable call() throws Exception {
listener.onDiscovery(typeName);
TypePool.Resolution resolution = typePool.describe(typeName);
if (resolution.isResolved()) {
TypeDescription typeDescription = resolution.resolve();
try {
if (!ignoredTypeMatcher.matches(typeDescription)) {
for (WithPreprocessor preprocessor : preprocessors) {
preprocessor.onPreprocess(typeDescription, classFileLocator);
}
return new Resolved(classFileVersion, typeDescription);
} else {
return new Ignored(typeDescription);
}
} catch (Throwable throwable) {
listener.onComplete(typeDescription);
if (throwable instanceof Exception) {
throw (Exception) throwable;
} else if (throwable instanceof Error) {
throw (Error) throwable;
} else {
throw new IllegalStateException(throwable);
}
}
} else {
return new Unresolved();
}
}
/**
* A resolved materializable.
*/
private class Resolved implements Callable {
/**
* The multi-release Java version number or {@code null} if a regular class.
*/
@MaybeNull
private final ClassFileVersion classFileVersion;
/**
* A description of the resolved type.
*/
private final TypeDescription typeDescription;
/**
* Creates a new resolved materializable.
*
* @param classFileVersion The multi-release Java version number or {@code null} if a regular class.
* @param typeDescription A description of the resolved type.
*/
private Resolved(@MaybeNull ClassFileVersion classFileVersion, TypeDescription typeDescription) {
this.classFileVersion = classFileVersion;
this.typeDescription = typeDescription;
}
/**
* {@inheritDoc}
*/
public Dispatcher.Materializable call() {
List applied = new ArrayList(), ignored = new ArrayList();
List errored = new ArrayList();
try {
DynamicType.Builder builder = typeStrategy.builder(byteBuddy, typeDescription, classFileLocator);
for (Plugin plugin : plugins) {
try {
if (plugin.matches(typeDescription)) {
builder = plugin.apply(builder, typeDescription, classFileLocator);
listener.onTransformation(typeDescription, plugin);
applied.add(plugin);
} else {
listener.onIgnored(typeDescription, plugin);
ignored.add(plugin);
}
} catch (Throwable throwable) {
listener.onError(typeDescription, plugin, throwable);
errored.add(throwable);
}
}
if (!errored.isEmpty()) {
listener.onError(typeDescription, errored);
return new Dispatcher.Materializable.ForFailedElement(element, typeDescription, errored);
} else if (!applied.isEmpty()) {
try {
DynamicType dynamicType = builder.make(TypeResolutionStrategy.Disabled.INSTANCE, typePool);
listener.onTransformation(typeDescription, applied);
for (Map.Entry entry : dynamicType.getLoadedTypeInitializers().entrySet()) {
if (entry.getValue().isAlive()) {
listener.onLiveInitializer(typeDescription, entry.getKey());
}
}
return new Dispatcher.Materializable.ForTransformedElement(classFileVersion, dynamicType);
} catch (Throwable throwable) {
errored.add(throwable);
listener.onError(typeDescription, errored);
return new Dispatcher.Materializable.ForFailedElement(element, typeDescription, errored);
}
} else {
listener.onIgnored(typeDescription, ignored);
return new Dispatcher.Materializable.ForRetainedElement(element);
}
} finally {
listener.onComplete(typeDescription);
}
}
}
/**
* A materializable for an ignored element.
*/
private class Ignored implements Callable 