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package com.fitbur.bytebuddy.dynamic;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import com.fitbur.bytebuddy.utility.StreamDrainer;
import java.io.*;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.Instrumentation;
import java.lang.reflect.Field;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.util.*;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
/**
* Locates a class file or its byte array representation when it is given its type description.
*/
public interface ClassFileLocator {
/**
* The file extension for a Java class file.
*/
String CLASS_FILE_EXTENSION = ".class";
/**
* Locates the class file for a given type and returns the binary data of the class file.
*
* @param typeName The name of the type to locate a class file representation for.
* @return Any binary representation of the type which might be illegal.
* @throws java.io.IOException If reading a class file causes an error.
*/
Resolution locate(String typeName) throws IOException;
/**
* Represents a class file as binary data.
*/
interface Resolution {
/**
* Checks if this binary representation is valid.
*
* @return {@code true} if this binary representation is valid.
*/
boolean isResolved();
/**
* Finds the data of this binary representation. Calling this method is only legal for resolved instances.
* For non-resolved instances, an exception is thrown.
*
* @return The requested binary data. The returned array must not be altered.
*/
byte[] resolve();
/**
* A canonical representation of an illegal binary representation.
*/
enum Illegal implements Resolution {
/**
* The singleton instance.
*/
INSTANCE;
@Override
public boolean isResolved() {
return false;
}
@Override
public byte[] resolve() {
throw new IllegalStateException("Could not read binary data");
}
@Override
public String toString() {
return "ClassFileLocator.Resolution.Illegal." + name();
}
}
/**
* Represents a byte array as binary data.
*/
class Explicit implements Resolution {
/**
* The represented data.
*/
private final byte[] binaryRepresentation;
/**
* Creates a new explicit resolution of a given array of binary data.
*
* @param binaryRepresentation The binary data to represent. The array must not be modified.
*/
@SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "The received value is never modified by contract")
public Explicit(byte[] binaryRepresentation) {
this.binaryRepresentation = binaryRepresentation;
}
@Override
public boolean isResolved() {
return true;
}
@Override
@SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "Return value must never be modified by contract")
public byte[] resolve() {
return binaryRepresentation;
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& Arrays.equals(binaryRepresentation, ((Explicit) other).binaryRepresentation);
}
@Override
public int hashCode() {
return Arrays.hashCode(binaryRepresentation);
}
@Override
public String toString() {
return "ClassFileLocator.Resolution.Explicit{" +
"binaryRepresentation=<" + binaryRepresentation.length + " bytes>" +
'}';
}
}
}
/**
* A class file locator that cannot locate any class files.
*/
enum NoOp implements ClassFileLocator {
/**
* The singleton instance.
*/
INSTANCE;
@Override
public Resolution locate(String typeName) {
return Resolution.Illegal.INSTANCE;
}
@Override
public String toString() {
return "ClassFileLocator.NoOp." + name();
}
}
/**
* A simple class file locator that returns class files from a selection of given types.
*/
class Simple implements ClassFileLocator {
/**
* The class files that are known to this class file locator mapped by their type name.
*/
private final Map classFiles;
/**
* Creates a new simple class file locator.
*
* @param classFiles The class files that are known to this class file locator mapped by their type name.
*/
public Simple(Map classFiles) {
this.classFiles = classFiles;
}
/**
* Creates a class file locator for a single known type.
*
* @param typeName The name of the type.
* @param binaryRepresentation The binary representation of the type.
* @return An appropriate class file locator.
*/
public static ClassFileLocator of(String typeName, byte[] binaryRepresentation) {
return new Simple(Collections.singletonMap(typeName, binaryRepresentation));
}
/**
* Creates a class file locator for a single known type with an additional fallback locator.
*
* @param typeName The name of the type.
* @param binaryRepresentation The binary representation of the type.
* @param fallback The class file locator to query in case that a lookup triggers any other type.
* @return An appropriate class file locator.
*/
public static ClassFileLocator of(String typeName, byte[] binaryRepresentation, ClassFileLocator fallback) {
return new Compound(new Simple(Collections.singletonMap(typeName, binaryRepresentation)), fallback);
}
@Override
public Resolution locate(String typeName) {
byte[] binaryRepresentation = classFiles.get(typeName);
return binaryRepresentation == null
? Resolution.Illegal.INSTANCE
: new Resolution.Explicit(binaryRepresentation);
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& classFiles.equals(((Simple) other).classFiles);
}
@Override
public int hashCode() {
return classFiles.hashCode();
}
@Override
public String toString() {
return "ClassFileLocator.Simple{" +
"classFiles=" + classFiles +
'}';
}
}
/**
* A class file locator that queries a class loader for binary representations of class files.
*/
class ForClassLoader implements ClassFileLocator {
/**
* The class loader to query.
*/
private final ClassLoader classLoader;
/**
* Creates a new class file locator for the given class loader.
*
* @param classLoader The class loader to query which must not be the bootstrap class loader, i.e. {@code null}.
*/
protected ForClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
/**
* Creates a class file locator that queries the system class loader.
*
* @return A class file locator that queries the system class loader.
*/
public static ClassFileLocator ofClassPath() {
return new ForClassLoader(ClassLoader.getSystemClassLoader());
}
/**
* Creates a class file locator for a given class loader.
*
* @param classLoader The class loader to be used. If this class loader represents the bootstrap class
* loader which is represented by the {@code null} value, this system class loader
* is used instead.
* @return A corresponding source locator.
*/
public static ClassFileLocator of(ClassLoader classLoader) {
return new ForClassLoader(classLoader == null
? ClassLoader.getSystemClassLoader()
: classLoader);
}
/**
* Attemts to create a binary representation of a loaded type by requesting data from its
* {@link java.lang.ClassLoader}.
*
* @param type The type of interest.
* @return The binary data to this type which might be illegal.
*/
public static Resolution read(Class type) {
try {
return ClassFileLocator.ForClassLoader.of(type.getClassLoader()).locate(type.getName());
} catch (IOException exception) {
throw new IllegalStateException("Cannot read class file for " + type, exception);
}
}
@Override
public Resolution locate(String typeName) throws IOException {
InputStream inputStream = classLoader.getResourceAsStream(typeName.replace('.', '/') + CLASS_FILE_EXTENSION);
if (inputStream != null) {
try {
return new Resolution.Explicit(StreamDrainer.DEFAULT.drain(inputStream));
} finally {
inputStream.close();
}
} else {
return Resolution.Illegal.INSTANCE;
}
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& classLoader.equals(((ForClassLoader) other).classLoader);
}
@Override
public int hashCode() {
return classLoader.hashCode();
}
@Override
public String toString() {
return "ClassFileLocator.ForClassLoader{" +
"classLoader=" + classLoader +
'}';
}
}
/**
* A class file locator that locates classes within a Java jar file.
*/
class ForJarFile implements ClassFileLocator, Closeable {
/**
* The jar file to read from.
*/
private final JarFile jarFile;
/**
* Creates a new class file locator for the given jar file.
*
* @param jarFile The jar file to read from.
*/
public ForJarFile(JarFile jarFile) {
this.jarFile = jarFile;
}
@Override
public Resolution locate(String typeName) throws IOException {
ZipEntry zipEntry = jarFile.getEntry(typeName.replace('.', '/') + CLASS_FILE_EXTENSION);
if (zipEntry == null) {
return Resolution.Illegal.INSTANCE;
} else {
InputStream inputStream = jarFile.getInputStream(zipEntry);
try {
return new Resolution.Explicit(StreamDrainer.DEFAULT.drain(inputStream));
} finally {
inputStream.close();
}
}
}
@Override
public void close() throws IOException {
jarFile.close();
}
@Override
public boolean equals(Object other) {
return this == other || other instanceof ForJarFile
&& jarFile.equals(((ForJarFile) other).jarFile);
}
@Override
public int hashCode() {
return jarFile.hashCode();
}
@Override
public String toString() {
return "ClassFileLocator.ForJarFile{" +
"jarFile=" + jarFile +
'}';
}
}
/**
* A class file locator that finds files from a standardized Java folder structure with
* folders donating packages and class files being saved as {@code .class} files
* within their package folder.
*/
class ForFolder implements ClassFileLocator {
/**
* The base folder of the package structure.
*/
private final File folder;
/**
* Creates a new class file locator for a folder structure of class files.
*
* @param folder The base folder of the package structure.
*/
public ForFolder(File folder) {
this.folder = folder;
}
@Override
public Resolution locate(String typeName) throws IOException {
File file = new File(folder, typeName.replace('.', File.separatorChar) + CLASS_FILE_EXTENSION);
if (file.exists()) {
InputStream inputStream = new BufferedInputStream(new FileInputStream(file));
try {
return new Resolution.Explicit(StreamDrainer.DEFAULT.drain(inputStream));
} finally {
inputStream.close();
}
} else {
return Resolution.Illegal.INSTANCE;
}
}
@Override
public boolean equals(Object other) {
return this == other || other instanceof ForFolder
&& folder.equals(((ForFolder) other).folder);
}
@Override
public int hashCode() {
return folder.hashCode();
}
@Override
public String toString() {
return "ClassFileLocator.ForFolder{" +
"folder=" + folder +
'}';
}
}
/**
* A Java agent that allows the location of class files by emulating a retransformation. Note that this class file
* locator causes a class to be loaded in order to look up its class file. Also, this locator does deliberately not
* support the look-up of classes that represent lambda expressions.
*/
class AgentBased implements ClassFileLocator {
/**
* The name of the Byte Buddy {@code com.fitbur.bytebuddy.agent.Installer} class.
*/
private static final String INSTALLER_TYPE = "com.fitbur.bytebuddy.agent.Installer";
/**
* The name of the {@code com.fitbur.bytebuddy.agent.Installer} field containing an installed {@link Instrumentation}.
*/
private static final String INSTRUMENTATION_FIELD = "instrumentation";
/**
* Indicator for accessing a field using reflection to make the code more readable.
*/
private static final Object STATIC_FIELD = null;
/**
* The instrumentation instance to use for looking up the binary format of a type.
*/
private final Instrumentation instrumentation;
/**
* The delegate to load a class by its name.
*/
private final ClassLoadingDelegate classLoadingDelegate;
/**
* Creates an agent-based class file locator.
*
* @param instrumentation The instrumentation to be used.
* @param classLoader The class loader to read a class from.
*/
public AgentBased(Instrumentation instrumentation, ClassLoader classLoader) {
this(instrumentation, ClassLoadingDelegate.Default.of(classLoader));
}
/**
* Creates an agent-based class file locator.
*
* @param instrumentation The instrumentation to be used.
* @param classLoadingDelegate The delegate responsible for class loading.
*/
public AgentBased(Instrumentation instrumentation, ClassLoadingDelegate classLoadingDelegate) {
if (!instrumentation.isRetransformClassesSupported()) {
throw new IllegalArgumentException(instrumentation + " does not support retransformation");
}
this.instrumentation = instrumentation;
this.classLoadingDelegate = classLoadingDelegate;
}
/**
* Returns an agent-based class file locator for the given class loader and an already installed
* Byte Buddy-agent.
*
* @param classLoader The class loader that is expected to load the looked-up a class.
* @return A class file locator for the given class loader based on a Byte Buddy agent.
*/
public static ClassFileLocator fromInstalledAgent(ClassLoader classLoader) {
try {
Instrumentation instrumentation = (Instrumentation) ClassLoader.getSystemClassLoader()
.loadClass(INSTALLER_TYPE)
.getDeclaredField(INSTRUMENTATION_FIELD)
.get(STATIC_FIELD);
if (instrumentation == null) {
throw new IllegalStateException("The Byte Buddy agent is not installed");
}
return new AgentBased(instrumentation, classLoader);
} catch (RuntimeException exception) {
throw exception;
} catch (Exception exception) {
throw new IllegalStateException("The Byte Buddy agent is not installed or not accessible", exception);
}
}
/**
* Returns a class file locator that is capable of locating a class file for the given type using the given instrumentation instance.
*
* @param instrumentation The instrumentation instance to query for a retransformation.
* @param type The locatable type which class loader is used as a fallback.
* @return A class file locator for locating the class file of the given type.
*/
public static ClassFileLocator of(Instrumentation instrumentation, Class type) {
return new AgentBased(instrumentation, ClassLoadingDelegate.Explicit.of(type));
}
@Override
public Resolution locate(String typeName) {
try {
ExtractionClassFileTransformer classFileTransformer = new ExtractionClassFileTransformer(classLoadingDelegate.getClassLoader(), typeName);
instrumentation.addTransformer(classFileTransformer, true);
try {
instrumentation.retransformClasses(classLoadingDelegate.locate(typeName));
byte[] binaryRepresentation = classFileTransformer.getBinaryRepresentation();
return binaryRepresentation == null
? Resolution.Illegal.INSTANCE
: new Resolution.Explicit(binaryRepresentation);
} finally {
instrumentation.removeTransformer(classFileTransformer);
}
} catch (RuntimeException exception) {
throw exception;
} catch (Exception ignored) {
return Resolution.Illegal.INSTANCE;
}
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& classLoadingDelegate.equals(((AgentBased) other).classLoadingDelegate)
&& instrumentation.equals(((AgentBased) other).instrumentation);
}
@Override
public int hashCode() {
return 31 * instrumentation.hashCode() + classLoadingDelegate.hashCode();
}
@Override
public String toString() {
return "ClassFileLocator.AgentBased{" +
"instrumentation=" + instrumentation +
", classLoadingDelegate=" + classLoadingDelegate +
'}';
}
/**
* A delegate that is queried for loading a class.
*/
public interface ClassLoadingDelegate {
/**
* Loads a class by its name.
*
* @param name The name of the type.
* @return The class with the given name.
* @throws ClassNotFoundException If a class cannot be found.
*/
Class locate(String name) throws ClassNotFoundException;
/**
* Returns the underlying class loader.
*
* @return The underlying class loader.
*/
ClassLoader getClassLoader();
/**
* A default implementation of a class loading delegate.
*/
class Default implements ClassLoadingDelegate {
/**
* The underlying class loader.
*/
protected final ClassLoader classLoader;
/**
* Creates a default class loading delegate.
*
* @param classLoader The class loader to be queried.
*/
protected Default(ClassLoader classLoader) {
this.classLoader = classLoader;
}
/**
* Creates a class loading delegate for the given class loader.
*
* @param classLoader The class loader for which to create a delegate.
* @return The class loading delegate for the provided class loader.
*/
public static ClassLoadingDelegate of(ClassLoader classLoader) {
return of(classLoader, AccessController.getContext());
}
/**
* Creates a class loading delegate for the given class loader.
*
* @param classLoader The class loader for which to create a delegate.
* @param accessControlContext The access control context to use when reading a class from a delegating class loader.
* @return The class loading delegate for the provided class loader.
*/
public static ClassLoadingDelegate of(ClassLoader classLoader, AccessControlContext accessControlContext) {
return ForDelegatingClassLoader.isDelegating(classLoader)
? new ForDelegatingClassLoader(classLoader, accessControlContext)
: new Default(classLoader == null ? ClassLoader.getSystemClassLoader() : classLoader);
}
@Override
public Class locate(String name) throws ClassNotFoundException {
return classLoader.loadClass(name);
}
@Override
public ClassLoader getClassLoader() {
return classLoader;
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
Default aDefault = (Default) other;
return !(classLoader != null ? !classLoader.equals(aDefault.classLoader) : aDefault.classLoader != null);
}
@Override
public int hashCode() {
return classLoader != null ? classLoader.hashCode() : 0;
}
@Override
public String toString() {
return "ClassFileLocator.AgentBased.ClassLoadingDelegate.Default{" +
"classLoader=" + classLoader +
'}';
}
}
/**
* A class loading delegate that accounts for a {@code sun.reflect.DelegatingClassLoader} which
* cannot load its own classes by name.
*/
class ForDelegatingClassLoader extends Default {
/**
* The name of the delegating class loader.
*/
private static final String DELEGATING_CLASS_LOADER_NAME = "sun.reflect.DelegatingClassLoader";
/**
* An index indicating the first element of a collection.
*/
private static final int ONLY = 0;
/**
* A dispatcher for extracting a class loader's loaded classes.
*/
private static final Dispatcher.Initializable DISPATCHER;
/*
* Locates the {@link java.lang.ClassLoader}'s field that contains all loaded classes.
*/
static {
Dispatcher.Initializable dispatcher;
try {
dispatcher = new Dispatcher.Resolved(ClassLoader.class.getDeclaredField("classes"));
} catch (Exception exception) {
dispatcher = new Dispatcher.Unresolved(exception);
}
DISPATCHER = dispatcher;
}
/**
* The access control context to use for accessing the field.
*/
private final AccessControlContext accessControlContext;
/**
* Creates a class loading delegate for a delegating class loader.
*
* @param classLoader The delegating class loader.
* @param accessControlContext The access control context to be used for accessing
*/
protected ForDelegatingClassLoader(ClassLoader classLoader, AccessControlContext accessControlContext) {
super(classLoader);
this.accessControlContext = accessControlContext;
}
/**
* Checks if a class loader is a delegating class loader.
*
* @param classLoader The class loader to inspect.
* @return {@code true} if the class loader is a delegating class loader.
*/
protected static boolean isDelegating(ClassLoader classLoader) {
return classLoader != null && classLoader.getClass().getName().equals(DELEGATING_CLASS_LOADER_NAME);
}
/**
* Normalizes a type name if it is loaded by an anonymous class loader.
*
* @param typeName The name as returned by {@link Class#getName()}.
* @return The non-anonymous name of the given class.
*/
private static String nonAnonymous(String typeName) {
int anonymousLoaderIndex = typeName.indexOf('/');
return anonymousLoaderIndex == -1
? typeName
: typeName.substring(0, anonymousLoaderIndex);
}
@Override
@SuppressWarnings("unchecked")
public Class locate(String name) throws ClassNotFoundException {
Vector> classes;
try {
classes = DISPATCHER.initialize(accessControlContext).extract(classLoader);
} catch (RuntimeException ignored) {
return super.locate(name);
}
if (classes.size() != 1) {
return super.locate(name);
}
Class type = classes.get(ONLY);
return nonAnonymous(type.getName()).equals(name)
? type
: super.locate(name);
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
if (!super.equals(other)) return false;
ForDelegatingClassLoader that = (ForDelegatingClassLoader) other;
return accessControlContext.equals(that.accessControlContext);
}
@Override
public int hashCode() {
int result = super.hashCode();
result = 31 * result + accessControlContext.hashCode();
return result;
}
@Override
public String toString() {
return "ClassFileLocator.AgentBased.ClassLoadingDelegate.ForDelegatingClassLoader{" +
"classLoader=" + classLoader +
", accessControlContext=" + accessControlContext +
'}';
}
/**
* Representation of a Java {@link java.lang.reflect.Field}.
*/
protected interface Dispatcher {
/**
* Reads the classes of the represented collection.
*
* @param classLoader The class loader to read from.
* @return The class loader's loaded classes.
*/
Vector> extract(ClassLoader classLoader);
/**
* An unitialized version of a dispatcher for extracting a class loader's loaded classes.
*/
interface Initializable {
/**
* Initializes the dispatcher.
*
* @param accessControlContext The access control context to use for accessing the private API.
* @return An initialized dispatcher.
*/
Dispatcher initialize(AccessControlContext accessControlContext);
}
/**
* Represents a field that could be located.
*/
class Resolved implements Dispatcher, Initializable, PrivilegedAction {
/**
* The represented field.
*/
private final Field field;
/**
* Creates a new resolved field.
*
* @param field the represented field.l
*/
public Resolved(Field field) {
this.field = field;
}
@Override
public Dispatcher initialize(AccessControlContext accessControlContext) {
return AccessController.doPrivileged(this, accessControlContext);
}
@Override
public Dispatcher run() {
field.setAccessible(true);
return this;
}
@Override
@SuppressWarnings("unchecked")
public Vector> extract(ClassLoader classLoader) {
try {
return (Vector>) field.get(classLoader);
} catch (IllegalAccessException exception) {
throw new IllegalStateException("Cannot access field", exception);
}
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& field.equals(((Resolved) other).field);
}
@Override
public int hashCode() {
return field.hashCode();
}
@Override
public String toString() {
return "ClassFileLocator.AgentBased.ClassLoadingDelegate.ForDelegatingClassLoader.Dispatcher.Resolved{" +
"field=" + field +
'}';
}
}
/**
* Represents a field that could not be located.
*/
class Unresolved implements Initializable {
/**
* The exception that occurred when attempting to locate the field.
*/
private final Exception exception;
/**
* Creates a representation of a non-resolved field.
*
* @param exception The exception that occurred when attempting to locate the field.
*/
public Unresolved(Exception exception) {
this.exception = exception;
}
@Override
public Dispatcher initialize(AccessControlContext accessControlContext) {
throw new IllegalStateException("Could not locate classes vector", exception);
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& exception.equals(((Unresolved) other).exception);
}
@Override
public int hashCode() {
return exception.hashCode();
}
@Override
public String toString() {
return "ClassFileLocator.AgentBased.ClassLoadingDelegate.ForDelegatingClassLoader.Dispatcher.Unresolved{" +
"exception=" + exception +
'}';
}
}
}
}
/**
* A class loading delegate that allows the location of explicitly registered classes that cannot
* be located by a class loader directly. This allows for locating classes that are loaded by
* an anonymous class loader which does not register its classes in a system dictionary.
*/
class Explicit implements ClassLoadingDelegate {
/**
* A class loading delegate that is queried for classes that are not registered explicitly.
*/
private final ClassLoadingDelegate fallbackDelegate;
/**
* The map of registered classes mapped by their name.
*/
private final Map> types;
/**
* Creates a new class loading delegate with a possibility of looking up explicitly
* registered classes.
*
* @param classLoader The class loader to be used for looking up classes.
* @param types A collection of classes that cannot be looked up explicitly.
*/
public Explicit(ClassLoader classLoader, Collection> types) {
this(Default.of(classLoader), types);
}
/**
* Creates a new class loading delegate with a possibility of looking up explicitly
* registered classes.
*
* @param fallbackDelegate The class loading delegate to query for any class that is not
* registered explicitly.
* @param types A collection of classes that cannot be looked up explicitly.
*/
public Explicit(ClassLoadingDelegate fallbackDelegate, Collection> types) {
this.fallbackDelegate = fallbackDelegate;
this.types = new HashMap>();
for (Class type : types) {
String typeName = type.getName();
int anonymousLoaderIndex = typeName.indexOf('/');
this.types.put(anonymousLoaderIndex == -1
? typeName
: typeName.substring(0, anonymousLoaderIndex), type);
}
}
/**
* Creates an explicit class loading delegate for the given type.
*
* @param type The type that is explicitly locatable.
* @return A suitable class loading delegate.
*/
public static ClassLoadingDelegate of(Class type) {
return new Explicit(type.getClassLoader(), Collections.singleton(type));
}
@Override
public Class locate(String name) throws ClassNotFoundException {
Class type = types.get(name);
return type == null
? fallbackDelegate.locate(name)
: type;
}
@Override
public ClassLoader getClassLoader() {
return fallbackDelegate.getClassLoader();
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& fallbackDelegate.equals(((Explicit) other).fallbackDelegate)
&& types.equals(((Explicit) other).types);
}
@Override
public int hashCode() {
int result = fallbackDelegate.hashCode();
result = 31 * result + types.hashCode();
return result;
}
@Override
public String toString() {
return "ClassFileLocator.AgentBased.ClassLoadingDelegate.Explicit{" +
"fallbackDelegate=" + fallbackDelegate +
", types=" + types +
'}';
}
}
}
/**
* A non-operational class file transformer that remembers the binary format of a given class.
*/
protected static class ExtractionClassFileTransformer implements ClassFileTransformer {
/**
* An indicator that an attempted class file transformation did not alter the handed class file.
*/
private static final byte[] DO_NOT_TRANSFORM = null;
/**
* The class loader that is expected to have loaded the looked-up a class.
*/
private final ClassLoader classLoader;
/**
* The name of the type to look up.
*/
private final String typeName;
/**
* The binary representation of the looked-up class.
*/
@SuppressFBWarnings(value = "VO_VOLATILE_REFERENCE_TO_ARRAY", justification = "By contract, the referenced array is not to be modified")
private volatile byte[] binaryRepresentation;
/**
* Creates a class file transformer for the purpose of extraction.
*
* @param classLoader The class loader that is expected to have loaded the looked-up a class.
* @param typeName The name of the type to look up.
*/
protected ExtractionClassFileTransformer(ClassLoader classLoader, String typeName) {
this.classLoader = classLoader;
this.typeName = typeName;
}
@Override
@SuppressFBWarnings(value = {"EI_EXPOSE_REP", "EI_EXPOSE_REP2"}, justification = "Return value is always null; received value is never modified")
public byte[] transform(ClassLoader classLoader,
String internalName,
Class redefinedType,
ProtectionDomain protectionDomain,
byte[] binaryRepresentation) {
if (internalName != null && isChild(classLoader) && typeName.equals(internalName.replace('/', '.'))) {
this.binaryRepresentation = binaryRepresentation;
}
return DO_NOT_TRANSFORM;
}
/**
* Checks if the given class loader is a child of the specified class loader.
*
* @param classLoader The class loader that loaded the retransformed class.
* @return {@code true} if te given class loader is a child of the specified class loader.
*/
private boolean isChild(ClassLoader classLoader) {
if (this.classLoader == null) {
return true; // The bootstrap class loader is any class loader's parent.
}
do {
if (classLoader == this.classLoader) {
return true;
}
} while ((classLoader = classLoader.getParent()) != null);
return false;
}
/**
* Returns the binary representation of the class file that was looked up. The returned array must never be modified.
*
* @return The binary representation of the class file or {@code null} if no such class file could
* be located.
*/
@SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "Return value must never be modified by contract")
protected byte[] getBinaryRepresentation() {
return binaryRepresentation;
}
@Override
public String toString() {
return "ClassFileLocator.AgentBased.ExtractionClassFileTransformer{" +
"classLoader=" + classLoader +
", typeName=" + typeName +
", binaryRepresentation=" +
(binaryRepresentation != null
? "<" + binaryRepresentation.length + " bytes>"
: "null") +
'}';
}
}
}
/**
* A compound {@link ClassFileLocator} that chains several locators.
* Any class file locator is queried in the supplied order until one locator is able to provide an input
* stream of the class file.
*/
class Compound implements ClassFileLocator {
/**
* The {@link ClassFileLocator}s which are represented by this compound
* class file locator in the order of their application.
*/
private final ClassFileLocator[] classFileLocator;
/**
* Creates a new compound class file locator.
*
* @param classFileLocator The {@link ClassFileLocator}s to be
* represented by this compound class file locator in the order of their application.
*/
public Compound(ClassFileLocator... classFileLocator) {
this.classFileLocator = classFileLocator;
}
@Override
public Resolution locate(String typeName) throws IOException {
for (ClassFileLocator classFileLocator : this.classFileLocator) {
Resolution resolution = classFileLocator.locate(typeName);
if (resolution.isResolved()) {
return resolution;
}
}
return Resolution.Illegal.INSTANCE;
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& Arrays.equals(classFileLocator, ((Compound) other).classFileLocator);
}
@Override
public int hashCode() {
return Arrays.hashCode(classFileLocator);
}
@Override
public String toString() {
return "ClassFileLocator.Compound{classFileLocator=" + Arrays.toString(classFileLocator) + '}';
}
}
}
