com.fitbur.bytebuddy.dynamic.loading.ByteArrayClassLoader Maven / Gradle / Ivy
package com.fitbur.bytebuddy.dynamic.loading;
import com.fitbur.bytebuddy.description.type.TypeDescription;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.com.fitbur.*;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.util.*;
/**
*
* A {@link java.lang.ClassLoader} that is capable of loading explicitly defined classes. The class loader will free
* any binary resources once a class that is defined by its binary data is loaded. This class loader is thread safe since
* the class loading mechanics are only called from synchronized context.
*
*
* Note: Instances of this class loader return URLs for their represented class loaders with the bytebuddy schema.
* These URLs do not represent URIs as two classes with the same name yield identical URLs but might represents different byte
* arrays.
*
*/
public class ByteArrayClassLoader extends ClassLoader {
/**
* The schema for URLs that represent a class file of byte array class loaders.
*/
public static final String URL_SCHEMA = "bytebuddy";
/**
* Indicates that an array should be included from its first index. Improves the source code readability.
*/
private static final int FROM_BEGINNING = 0;
/**
* Indicates that a URL does not exist to improve code readability.
*/
private static final URL NO_URL = null;
/**
* A mutable map of type names mapped to their binary representation.
*/
protected final Map typeDefinitions;
/**
* The persistence handler of this class loader.
*/
protected final PersistenceHandler persistenceHandler;
/**
* The protection domain to apply. Might be {@code null} when referencing the default protection domain.
*/
protected final ProtectionDomain protectionDomain;
/**
* The package definer to be queried for package definitions.
*/
protected final PackageDefinitionStrategy packageDefinitionStrategy;
/**
* The access control context to use for loading classes.
*/
protected final AccessControlContext accessControlContext;
/**
* Creates a new class loader for a given definition of classes.
*
* @param parent The {@link java.lang.ClassLoader} that is the parent of this class loader.
* @param typeDefinitions A map of fully qualified class names pointing to their binary representations.
* @param protectionDomain The protection domain to apply where {@code null} references an implicit protection domain.
* @param accessControlContext The access control context to use for loading classes.
* @param packageDefinitionStrategy The package definer to be queried for package definitions.
* @param persistenceHandler The persistence handler of this class loader.
*/
public ByteArrayClassLoader(ClassLoader parent,
Map typeDefinitions,
ProtectionDomain protectionDomain,
AccessControlContext accessControlContext,
PersistenceHandler persistenceHandler,
PackageDefinitionStrategy packageDefinitionStrategy) {
super(parent);
this.typeDefinitions = new HashMap(typeDefinitions);
this.protectionDomain = protectionDomain;
this.accessControlContext = accessControlContext;
this.persistenceHandler = persistenceHandler;
this.packageDefinitionStrategy = packageDefinitionStrategy;
}
/**
* Creates a new class loader for a given definition of classes.
*
* @param parent The {@link java.lang.ClassLoader} that is the parent of this class loader.
* @param typeDefinitions A map of type descriptions pointing to their binary representations.
* @param protectionDomain The protection domain to apply where {@code null} references an implicit protection domain.
* @param accessControlContext The access control context to use for loading classes.
* @param persistenceHandler The persistence handler to be used by the created class loader.
* @param packageDefinitionStrategy The package definer to be queried for package definitions.
* @param childFirst {@code true} if the class loader should apply child first semantics when loading
* the {@code typeDefinitions}.
* @return A corresponding class loader.
*/
public static ClassLoader of(ClassLoader parent,
Map typeDefinitions,
ProtectionDomain protectionDomain,
AccessControlContext accessControlContext,
PersistenceHandler persistenceHandler,
PackageDefinitionStrategy packageDefinitionStrategy,
boolean childFirst) {
Map namedTypeDefinitions = new HashMap();
for (Map.Entry entry : typeDefinitions.entrySet()) {
namedTypeDefinitions.put(entry.getKey().getName(), entry.getValue());
}
return AccessController.doPrivileged(new ClassLoaderCreationAction(parent,
namedTypeDefinitions,
protectionDomain,
accessControlContext,
persistenceHandler,
packageDefinitionStrategy,
childFirst), accessControlContext);
}
/**
* Loads a given set of class descriptions and their binary representations.
*
* @param classLoader The parent class loader.
* @param types The unloaded types to be loaded.
* @param protectionDomain The protection domain to apply where {@code null} references an implicit protection domain.
* @param accessControlContext The access control context to use for loading classes.
* @param persistenceHandler The persistence handler of the created class loader.
* @param packageDefinitionStrategy The package definer to be queried for package definitions.
* @param childFirst {@code true} if the created class loader should apply child-first semantics when loading the {@code types}.
* @param forbidExisting {@code true} if the class loading should throw an exception if a class was already loaded by a parent class loader.
* @return A map of the given type descriptions pointing to their loaded representations.
*/
public static Map> load(ClassLoader classLoader,
Map types,
ProtectionDomain protectionDomain,
AccessControlContext accessControlContext,
PersistenceHandler persistenceHandler,
PackageDefinitionStrategy packageDefinitionStrategy,
boolean childFirst,
boolean forbidExisting) {
Map> loadedTypes = new LinkedHashMap>();
classLoader = ByteArrayClassLoader.of(classLoader,
types,
protectionDomain,
accessControlContext,
persistenceHandler,
packageDefinitionStrategy,
childFirst);
for (TypeDescription typeDescription : types.keySet()) {
try {
Class type = classLoader.loadClass(typeDescription.getName());
if (forbidExisting && type.getClassLoader() != classLoader) {
throw new IllegalStateException("Class already loaded: " + type);
}
loadedTypes.put(typeDescription, type);
} catch (ClassNotFoundException exception) {
throw new IllegalStateException("Cannot load class " + typeDescription, exception);
}
}
return loadedTypes;
}
@Override
protected Class findClass(String name) throws ClassNotFoundException {
byte[] javaType = persistenceHandler.lookup(name, typeDefinitions);
if (javaType != null) {
int packageIndex = name.lastIndexOf('.');
if (packageIndex != -1) {
String packageName = name.substring(0, packageIndex);
PackageDefinitionStrategy.Definition definition = packageDefinitionStrategy.define(ByteArrayClassLoader.this, packageName, name);
if (definition.isDefined()) {
Package definedPackage = getPackage(packageName);
if (definedPackage == null) {
definePackage(packageName,
definition.getSpecificationTitle(),
definition.getSpecificationVersion(),
definition.getSpecificationVendor(),
definition.getImplementationTitle(),
definition.getImplementationVersion(),
definition.getImplementationVendor(),
definition.getSealBase());
} else if (!definition.isCompatibleTo(definedPackage)) {
throw new SecurityException("Sealing violation for package " + packageName);
}
}
}
return defineClass(name, javaType, FROM_BEGINNING, javaType.length, protectionDomain);
}
throw new ClassNotFoundException(name);
}
@Override
protected URL findResource(String name) {
return persistenceHandler.url(name, typeDefinitions, accessControlContext);
}
@Override
protected Enumeration findResources(String name) {
URL url = persistenceHandler.url(name, typeDefinitions, accessControlContext);
return url == null
? EmptyEnumeration.INSTANCE
: new SingletonEnumeration(url);
}
@Override
public String toString() {
return "ByteArrayClassLoader{" +
"parent=" + getParent() +
", typeDefinitions=" + typeDefinitions +
", persistenceHandler=" + persistenceHandler +
", protectionDomain=" + protectionDomain +
", packageDefinitionStrategy=" + packageDefinitionStrategy +
", accessControlContext=" + accessControlContext +
'}';
}
/**
* A persistence handler decides on weather the byte array that represents a loaded class is exposed by
* the {@link java.lang.ClassLoader#getResourceAsStream(String)} method.
*/
public enum PersistenceHandler {
/**
* The manifest persistence handler retains all class file representations and makes them accessible.
*/
MANIFEST(true) {
@Override
protected byte[] lookup(String name, Map typeDefinitions) {
return typeDefinitions.get(name);
}
@Override
protected URL url(String resourceName, Map typeDefinitions, AccessControlContext accessControlContext) {
if (!resourceName.endsWith(CLASS_FILE_SUFFIX)) {
return NO_URL;
} else if (resourceName.startsWith("/")) {
resourceName = resourceName.substring(1);
}
String typeName = resourceName.replace('/', '.').substring(FROM_BEGINNING, resourceName.length() - CLASS_FILE_SUFFIX.length());
byte[] binaryRepresentation = typeDefinitions.get(typeName);
return binaryRepresentation == null
? NO_URL
: AccessController.doPrivileged(new UrlDefinitionAction(resourceName, binaryRepresentation), accessControlContext);
}
},
/**
* The latent persistence handler hides all class file representations and does not make them accessible
* even before they are loaded.
*/
LATENT(false) {
@Override
protected byte[] lookup(String name, Map typeDefinitions) {
return typeDefinitions.remove(name);
}
@Override
protected URL url(String resourceName, Map typeDefinitions, AccessControlContext accessControlContext) {
return NO_URL;
}
};
/**
* The suffix of files in the Java class file format.
*/
private static final String CLASS_FILE_SUFFIX = ".class";
/**
* {@code true} if this persistence handler represents manifest class file storage.
*/
private final boolean manifest;
/**
* Creates a new persistence handler.
*
* @param manifest {@code true} if this persistence handler represents manifest class file storage.
*/
PersistenceHandler(boolean manifest) {
this.manifest = manifest;
}
/**
* Checks if this persistence handler represents manifest class file storage.
*
* @return {@code true} if this persistence handler represents manifest class file storage.
*/
public boolean isManifest() {
return manifest;
}
/**
* Performs a lookup of a class file by its name.
*
* @param name The name of the class to be loaded.
* @param typeDefinitions A map of fully qualified class names pointing to their binary representations.
* @return The byte array representing the requested class or {@code null} if no such class is known.
*/
protected abstract byte[] lookup(String name, Map typeDefinitions);
/**
* Returns a URL representing a class file.
*
* @param resourceName The name of the requested resource.
* @param typeDefinitions A mapping of byte arrays by their type names.
* @param accessControlContext The access control context to be used for creating the URL.
* @return A URL representing the type definition or {@code null} if the requested resource does not represent a class file.
*/
protected abstract URL url(String resourceName, Map typeDefinitions, AccessControlContext accessControlContext);
@Override
public String toString() {
return "ByteArrayClassLoader.PersistenceHandler." + name();
}
/**
* An action to define a URL that represents a class file.
*/
protected static class UrlDefinitionAction implements PrivilegedAction {
/**
* The URL's encoding character set.
*/
private static final String ENCODING = "UTF-8";
/**
* A value to define a standard port as Byte Buddy's URLs do not represent a port.
*/
private static final int NO_PORT = -1;
/**
* Indicates that Byte Buddy's URLs do not have a file segment.
*/
private static final String NO_FILE = "";
/**
* The name of the type that this URL represents.
*/
private final String typeName;
/**
* The binary representation of the type's class file.
*/
private final byte[] binaryRepresentation;
/**
* Creates a new URL definition action.
*
* @param typeName The name of the type that this URL represents.
* @param binaryRepresentation The binary representation of the type's class file.
*/
protected UrlDefinitionAction(String typeName, byte[] binaryRepresentation) {
this.typeName = typeName;
this.binaryRepresentation = binaryRepresentation;
}
@Override
public URL run() {
try {
return new URL(URL_SCHEMA,
URLEncoder.encode(typeName.replace('.', '/'), ENCODING),
NO_PORT,
NO_FILE,
new ByteArrayUrlStreamHandler(binaryRepresentation));
} catch (MalformedURLException exception) {
throw new IllegalStateException("Cannot create URL for " + typeName, exception);
} catch (UnsupportedEncodingException exception) {
throw new IllegalStateException("Could not find encoding: " + ENCODING, exception);
}
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
UrlDefinitionAction that = (UrlDefinitionAction) other;
return typeName.equals(that.typeName) && Arrays.equals(binaryRepresentation, that.binaryRepresentation);
}
@Override
public int hashCode() {
int result = typeName.hashCode();
result = 31 * result + Arrays.hashCode(binaryRepresentation);
return result;
}
@Override
public String toString() {
return "ByteArrayClassLoader.PersistenceHandler.UrlDefinitionAction{" +
"typeName='" + typeName + '\'' +
"binaryRepresentation=<" + binaryRepresentation.length + " bytes>" +
'}';
}
/**
* A stream handler that returns the given binary representation.
*/
protected static class ByteArrayUrlStreamHandler extends URLStreamHandler {
/**
* The binary representation of a type's class file.
*/
private final byte[] binaryRepresentation;
/**
* Creates a new byte array URL stream handler.
*
* @param binaryRepresentation The binary representation of a type's class file.
*/
protected ByteArrayUrlStreamHandler(byte[] binaryRepresentation) {
this.binaryRepresentation = binaryRepresentation;
}
@Override
protected URLConnection openConnection(URL url) throws IOException {
return new ByteArrayUrlConnection(url, new ByteArrayInputStream(binaryRepresentation));
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
ByteArrayUrlStreamHandler that = (ByteArrayUrlStreamHandler) other;
return Arrays.equals(binaryRepresentation, that.binaryRepresentation);
}
@Override
public int hashCode() {
return Arrays.hashCode(binaryRepresentation);
}
@Override
public String toString() {
return "ByteArrayClassLoader.PersistenceHandler.UrlDefinitionAction.ByteArrayUrlStreamHandler{" +
"binaryRepresentation=<" + binaryRepresentation.length + " bytes>" +
'}';
}
/**
* A URL connection for a given byte array.
*/
protected static class ByteArrayUrlConnection extends URLConnection {
/**
* The input stream to return for this connection.
*/
private final InputStream inputStream;
/**
* Creates a new byte array URL connection.
*
* @param url The URL that this connection represents.
* @param inputStream The input stream to return from this connection.
*/
protected ByteArrayUrlConnection(URL url, InputStream inputStream) {
super(url);
this.inputStream = inputStream;
}
@Override
public void connect() {
connected = true;
}
@Override
public InputStream getInputStream() {
connect(); // Mimics the semantics of an actual URL connection.
return inputStream;
}
@Override
public String toString() {
return "ByteArrayClassLoader.PersistenceHandler.UrlDefinitionAction.ByteArrayUrlStreamHandler.ByteArrayUrlConnection{" +
"inputStream=" + inputStream +
'}';
}
}
}
}
}
/**
*
* A {@link com.fitbur.bytebuddy.dynamic.loading.ByteArrayClassLoader} which applies child-first semantics for the
* given type definitions.
*
*
* Important: Package definitions remain their parent-first semantics as loaded package definitions do not expose their class loaders.
* Also, it is not possible to make this class or its subclass parallel-capable as the loading strategy is overridden.
*
*/
public static class ChildFirst extends ByteArrayClassLoader {
/**
* The suffix of files in the Java class file format.
*/
private static final String CLASS_FILE_SUFFIX = ".class";
/**
* The synchronization engine for the executing JVM.
*/
private static final SynchronizationStrategy SYNCHRONIZATION_STRATEGY;
/*
* Sets up the suitable synchronization engine (Java 8+ or earlier).
*/
static {
SynchronizationStrategy synchronizationStrategy;
try {
synchronizationStrategy = SynchronizationStrategy.ForJava7CapableVm.resolve();
} catch (Exception ignored) {
synchronizationStrategy = SynchronizationStrategy.ForLegacyVm.INSTANCE;
}
SYNCHRONIZATION_STRATEGY = synchronizationStrategy;
}
/**
* Creates a new child-first byte array class loader.
*
* @param parent The {@link java.lang.ClassLoader} that is the parent of this class loader.
* @param typeDefinitions A map of fully qualified class names pointing to their binary representations.
* @param protectionDomain The protection domain to apply where {@code null} references an implicit protection domain.
* @param accessControlContext The access control context to use for loading classes.
* @param persistenceHandler The persistence handler of this class loader.
* @param packageDefinitionStrategy The package definer to be queried for package definitions.
*/
public ChildFirst(ClassLoader parent,
Map typeDefinitions,
ProtectionDomain protectionDomain,
AccessControlContext accessControlContext,
PersistenceHandler persistenceHandler,
PackageDefinitionStrategy packageDefinitionStrategy) {
super(parent, typeDefinitions, protectionDomain, accessControlContext, persistenceHandler, packageDefinitionStrategy);
}
@Override
protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
synchronized (SYNCHRONIZATION_STRATEGY.classLoadingLock(name, this)) {
Class type = findLoadedClass(name);
if (type != null) {
return type;
}
try {
type = findClass(name);
if (resolve) {
resolveClass(type);
}
return type;
} catch (ClassNotFoundException exception) {
// If an unknown class is loaded, this implementation causes the findClass method of this instance
// to be triggered twice. This is however of minor importance because this would result in a
// ClassNotFoundException what does not alter the outcome.
return super.loadClass(name, resolve);
}
}
}
@Override
public URL getResource(String name) {
URL url = persistenceHandler.url(name, typeDefinitions, accessControlContext);
// If a class resource is defined by this class loader but it is not defined in a manifest manner,
// the resource of the parent class loader should be shadowed by 'null'. Note that the delegation
// model causes a redundant query to the persistent handler but renders a correct result.
return url != null || isShadowed(name)
? url
: super.getResource(name);
}
@Override
public Enumeration getResources(String name) throws IOException {
URL url = persistenceHandler.url(name, typeDefinitions, accessControlContext);
return url == null
? super.getResources(name)
: new PrependingEnumeration(url, super.getResources(name));
}
/**
* Checks if a resource name represents a class file of a class that was loaded by this class loader.
*
* @param resourceName The resource name of the class to be exposed as its class file.
* @return {@code true} if this class represents a class that is being loaded by this class loader.
*/
private boolean isShadowed(String resourceName) {
if (persistenceHandler.isManifest() || !resourceName.endsWith(CLASS_FILE_SUFFIX)) {
return false;
}
// This synchronization is required to avoid a racing condition to the actual class loading.
synchronized (this) {
String typeName = resourceName.replace('/', '.').substring(0, resourceName.length() - CLASS_FILE_SUFFIX.length());
if (typeDefinitions.containsKey(typeName)) {
return true;
}
Class loadedClass = findLoadedClass(typeName);
return loadedClass != null && loadedClass.getClassLoader() == this;
}
}
@Override
public String toString() {
return "ByteArrayClassLoader.ChildFirst{" +
"parent=" + getParent() +
", typeDefinitions=" + typeDefinitions +
", protectionDomain=" + protectionDomain +
", accessControlContext=" + accessControlContext +
", persistenceHandler=" + persistenceHandler +
", packageDefinitionStrategy=" + packageDefinitionStrategy +
'}';
}
/**
* An engine for receiving a class loading lock when loading a class.
*/
protected interface SynchronizationStrategy {
/**
* Receives the class loading lock.
*
* @param name The name of the class being loaded.
* @param classLoader The class loader loading the class.
* @return The corresponding class loading lock.
*/
Object classLoadingLock(String name, ClassLoader classLoader);
/**
* A synchronization engine for a VM that is not aware of parallel-capable class loaders.
*/
enum ForLegacyVm implements SynchronizationStrategy {
/**
* The singleton instance.
*/
INSTANCE;
@Override
public Object classLoadingLock(String name, ClassLoader classLoader) {
return classLoader;
}
@Override
public String toString() {
return "ByteArrayClassLoader.ChildFirst.SynchronizationStrategy.ForLegacyVm." + name();
}
}
/**
* A synchronization engine for a VM that is aware of parallel-capable class loaders.
*/
class ForJava7CapableVm implements SynchronizationStrategy, PrivilegedAction {
/**
* The {@code ClassLoader#getClassLoadingLock(String)} method.
*/
private final Method method;
/**
* Creates a new synchronization engine.
*
* @param method The {@code ClassLoader#getClassLoadingLock(String)} method.
*/
protected ForJava7CapableVm(Method method) {
this.method = method;
}
/**
* Resolves a synchronization engine for a modern VM if this is possible.
*
* @return A modern synchronization engine.
* @throws NoSuchMethodException If the executing VM is not a modern VM.
*/
protected static SynchronizationStrategy resolve() throws NoSuchMethodException {
return AccessController.doPrivileged(new ForJava7CapableVm(ClassLoader.class.getDeclaredMethod("getClassLoadingLock", String.class)));
}
@Override
public Object classLoadingLock(String name, ClassLoader classLoader) {
try {
return method.invoke(classLoader, name);
} catch (IllegalAccessException exception) {
throw new IllegalStateException("Cannot access class loading lock for " + name + " on " + classLoader, exception);
} catch (InvocationTargetException exception) {
throw new IllegalStateException("Error when getting " + name + " on " + classLoader, exception);
}
}
@Override
public SynchronizationStrategy run() {
method.setAccessible(true);
return this;
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& method.equals(((ForJava7CapableVm) other).method);
}
@Override
public int hashCode() {
return method.hashCode();
}
@Override
public String toString() {
return "ByteArrayClassLoader.ChildFirst.SynchronizationStrategy.ForJava7CapableVm{method=" + method + '}';
}
}
}
/**
* An enumeration that prepends an element to another enumeration and skips the last element of the provided enumeration.
*/
protected static class PrependingEnumeration implements Enumeration {
/**
* The next element to return from this enumeration or {@code null} if such an element does not exist.
*/
private URL nextElement;
/**
* The enumeration from which the next elements should be pulled.
*/
private final Enumeration enumeration;
/**
* Creates a new prepending enumeration.
*
* @param url The first element of the enumeration.
* @param enumeration An enumeration that is used for pulling subsequent urls.
*/
protected PrependingEnumeration(URL url, Enumeration enumeration) {
nextElement = url;
this.enumeration = enumeration;
}
@Override
public boolean hasMoreElements() {
return nextElement != null && enumeration.hasMoreElements();
}
@Override
public URL nextElement() {
if (nextElement != null && enumeration.hasMoreElements()) {
try {
return nextElement;
} finally {
nextElement = enumeration.nextElement();
}
} else {
throw new NoSuchElementException();
}
}
@Override
public String toString() {
return "ByteArrayClassLoader.ChildFirst.PrependingEnumeration{" +
"nextElement=" + nextElement +
", enumeration=" + enumeration +
'}';
}
}
}
/**
* An action for creating a class loader.
*/
protected static class ClassLoaderCreationAction implements PrivilegedAction {
/**
* The {@link java.lang.ClassLoader} that is the parent of this class loader.
*/
private final ClassLoader parent;
/**
* A map of fully qualified class names pointing to their binary representations.
*/
private final Map typeDefinitions;
/**
* The protection domain to apply where {@code null} references an implicit protection domain.
*/
private final ProtectionDomain protectionDomain;
/**
* The access control context to use for loading classes.
*/
private final AccessControlContext accessControlContext;
/**
* The persistence handler of this class loader.
*/
private final PersistenceHandler persistenceHandler;
/**
* The package definer to be queried for package definitions.
*/
private final PackageDefinitionStrategy packageDefinitionStrategy;
/**
* {@code true} if this action should create a child-first class loader.
*/
private final boolean childFirst;
/**
* Creates a new class loader creation action.
*
* @param parent The {@link java.lang.ClassLoader} that is the parent of this class loader.
* @param typeDefinitions A map of fully qualified class names pointing to their binary representations.
* @param protectionDomain The protection domain to apply where {@code null} references an implicit protection domain.
* @param accessControlContext The access control context to use for loading classes.
* @param persistenceHandler The persistence handler of this class loader.
* @param packageDefinitionStrategy The package definer to be queried for package definitions.
* @param childFirst {@code true} if this action should create a child-first class loader.
*/
protected ClassLoaderCreationAction(ClassLoader parent,
Map typeDefinitions,
ProtectionDomain protectionDomain,
AccessControlContext accessControlContext,
PersistenceHandler persistenceHandler,
PackageDefinitionStrategy packageDefinitionStrategy,
boolean childFirst) {
this.parent = parent;
this.typeDefinitions = typeDefinitions;
this.protectionDomain = protectionDomain;
this.accessControlContext = accessControlContext;
this.persistenceHandler = persistenceHandler;
this.packageDefinitionStrategy = packageDefinitionStrategy;
this.childFirst = childFirst;
}
@Override
public ClassLoader run() {
return childFirst
? new ChildFirst(parent, typeDefinitions, protectionDomain, accessControlContext, persistenceHandler, packageDefinitionStrategy)
: new ByteArrayClassLoader(parent, typeDefinitions, protectionDomain, accessControlContext, persistenceHandler, packageDefinitionStrategy);
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
ClassLoaderCreationAction that = (ClassLoaderCreationAction) other;
return childFirst == that.childFirst
&& parent.equals(that.parent)
&& typeDefinitions.equals(that.typeDefinitions)
&& !(protectionDomain != null ? !protectionDomain.equals(that.protectionDomain) : that.protectionDomain != null)
&& accessControlContext.equals(that.accessControlContext)
&& persistenceHandler == that.persistenceHandler
&& packageDefinitionStrategy.equals(that.packageDefinitionStrategy);
}
@Override
public int hashCode() {
int result = parent.hashCode();
result = 31 * result + typeDefinitions.hashCode();
result = 31 * result + (protectionDomain != null ? protectionDomain.hashCode() : 0);
result = 31 * result + accessControlContext.hashCode();
result = 31 * result + persistenceHandler.hashCode();
result = 31 * result + packageDefinitionStrategy.hashCode();
result = 31 * result + (childFirst ? 1 : 0);
return result;
}
@Override
public String toString() {
return "ByteArrayClassLoader.ClassLoaderCreationAction{" +
"parent=" + parent +
", typeDefinitions=" + typeDefinitions +
", protectionDomain=" + protectionDomain +
", accessControlContext=" + accessControlContext +
", persistenceHandler=" + persistenceHandler +
", packageDefinitionStrategy=" + packageDefinitionStrategy +
", childFirst=" + childFirst +
'}';
}
}
/**
* An enumeration without any elements.
*/
protected enum EmptyEnumeration implements Enumeration {
/**
* The singleton instance.
*/
INSTANCE;
@Override
public boolean hasMoreElements() {
return false;
}
@Override
public URL nextElement() {
throw new NoSuchElementException();
}
@Override
public String toString() {
return "ByteArrayClassLoader.EmptyEnumeration." + name();
}
}
/**
* An enumeration that contains a single element.
*/
protected static class SingletonEnumeration implements Enumeration {
/**
* The current element or {@code null} if this enumeration does not contain further elements.
*/
private URL element;
/**
* Creates a new singleton enumeration.
*
* @param element The only element.
*/
protected SingletonEnumeration(URL element) {
this.element = element;
}
@Override
public boolean hasMoreElements() {
return element != null;
}
@Override
public URL nextElement() {
if (element == null) {
throw new NoSuchElementException();
} else {
try {
return element;
} finally {
element = null;
}
}
}
@Override
public String toString() {
return "ByteArrayClassLoader.SingletonEnumeration{" +
"element=" + element +
'}';
}
}
}