net.bytebuddy.agent.builder.ResettableClassFileTransformer 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.agent.builder;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.build.AccessControllerPlugin;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
import net.bytebuddy.dynamic.scaffold.TypeValidation;
import net.bytebuddy.implementation.MethodCall;
import net.bytebuddy.utility.JavaModule;
import net.bytebuddy.utility.JavaType;
import net.bytebuddy.utility.nullability.MaybeNull;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.util.Iterator;
import static net.bytebuddy.matcher.ElementMatchers.named;
import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
/**
* A class file transformer that can reset its transformation.
*/
public interface ResettableClassFileTransformer extends ClassFileTransformer {
/**
* Creates an iterator over the transformers that are applied for a given type.
*
* @param typeDescription A description of a type.
* @param classLoader The type's class loader or {@code null} if the boot loader.
* @param module The type's module or {@code null} if the module system is not supported by the current VM.
* @param classBeingRedefined The class being redefined or {@code null} if the type is not yet loaded.
* @param protectionDomain The type's protection domain.
* @return An iterator over the transformers that are applied by this class file transformer if the given type is discovered.
*/
Iterator iterator(TypeDescription typeDescription,
@MaybeNull ClassLoader classLoader,
@MaybeNull JavaModule module,
@MaybeNull Class classBeingRedefined,
ProtectionDomain protectionDomain);
/**
*
* Deregisters this class file transformer and redefines any transformed class to its state without this
* class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled,
* only the {@link net.bytebuddy.agent.builder.AgentBuilder.InstallationListener} is informed about the
* resetting without undoing any code changes.
*
*
* Note: A reset class file transformer should not be reinstalled. Instead, the {@link AgentBuilder}
* which built the transformer should be asked to install a new transformer.
*
*
* Important: Most JVMs do not support changes of a class's structure after a class was already
* loaded. Therefore, it is typically required that this class file transformer was built while enabling
* {@link AgentBuilder#disableClassFormatChanges()}.
*
*
* @param instrumentation The instrumentation instance from which to deregister the transformer.
* @param redefinitionStrategy The redefinition to apply.
* @return {@code true} if a reset was applied and this transformer was not previously removed.
*/
boolean reset(Instrumentation instrumentation, AgentBuilder.RedefinitionStrategy redefinitionStrategy);
/**
*
* Deregisters this class file transformer and redefines any transformed class to its state without this
* class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled,
* only the {@link net.bytebuddy.agent.builder.AgentBuilder.InstallationListener} is informed about the
* resetting without undoing any code changes.
*
*
* Note: A reset class file transformer should not be reinstalled. Instead, the {@link AgentBuilder}
* which built the transformer should be asked to install a new transformer.
*
*
* Important: Most JVMs do not support changes of a class's structure after a class was already
* loaded. Therefore, it is typically required that this class file transformer was built while enabling
* {@link AgentBuilder#disableClassFormatChanges()}.
*
*
* @param instrumentation The instrumentation instance from which to deregister the transformer.
* @param redefinitionStrategy The redefinition to apply.
* @param redefinitionBatchAllocator The batch allocator to use.
* @return {@code true} if a reset was applied and this transformer was not previously removed.
*/
@SuppressWarnings("overloads")
boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator);
/**
*
* Deregisters this class file transformer and redefines any transformed class to its state without this
* class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled,
* only the {@link net.bytebuddy.agent.builder.AgentBuilder.InstallationListener} is informed about the
* resetting without undoing any code changes.
*
*
* Note: A reset class file transformer should not be reinstalled. Instead, the {@link AgentBuilder}
* which built the transformer should be asked to install a new transformer.
*
*
* Important: Most JVMs do not support changes of a class's structure after a class was already
* loaded. Therefore, it is typically required that this class file transformer was built while enabling
* {@link AgentBuilder#disableClassFormatChanges()}.
*
*
* @param instrumentation The instrumentation instance from which to deregister the transformer.
* @param redefinitionStrategy The redefinition to apply.
* @param redefinitionDiscoveryStrategy The discovery strategy for the types to reset.
* @return {@code true} if a reset was applied and this transformer was not previously removed.
*/
@SuppressWarnings("overloads")
boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy);
/**
*
* Deregisters this class file transformer and redefines any transformed class to its state without this
* class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled,
* only the {@link net.bytebuddy.agent.builder.AgentBuilder.InstallationListener} is informed about the
* resetting without undoing any code changes.
*
*
* Note: A reset class file transformer should not be reinstalled. Instead, the {@link AgentBuilder}
* which built the transformer should be asked to install a new transformer.
*
*
* Important: Most JVMs do not support changes of a class's structure after a class was already
* loaded. Therefore, it is typically required that this class file transformer was built while enabling
* {@link AgentBuilder#disableClassFormatChanges()}.
*
*
* @param instrumentation The instrumentation instance from which to deregister the transformer.
* @param redefinitionStrategy The redefinition to apply.
* @param redefinitionDiscoveryStrategy The discovery strategy for the types to reset.
* @param redefinitionBatchAllocator The batch allocator to use.
* @return {@code true} if a reset was applied and this transformer was not previously removed.
*/
boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy);
/**
*
* Deregisters this class file transformer and redefines any transformed class to its state without this
* class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled,
* only the {@link net.bytebuddy.agent.builder.AgentBuilder.InstallationListener} is informed about the
* resetting without undoing any code changes.
*
*
* Note: A reset class file transformer should not be reinstalled. Instead, the {@link AgentBuilder}
* which built the transformer should be asked to install a new transformer.
*
*
* Important: Most JVMs do not support changes of a class's structure after a class was already
* loaded. Therefore, it is typically required that this class file transformer was built while enabling
* {@link AgentBuilder#disableClassFormatChanges()}.
*
*
* @param instrumentation The instrumentation instance from which to deregister the transformer.
* @param redefinitionStrategy The redefinition to apply.
* @param redefinitionDiscoveryStrategy The discovery strategy for the types to reset.
* @param redefinitionListener The redefinition listener to apply.
* @return {@code true} if a reset was applied and this transformer was not previously removed.
*/
@SuppressWarnings("overloads")
boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener);
/**
*
* Deregisters this class file transformer and redefines any transformed class to its state without this
* class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled,
* only the {@link net.bytebuddy.agent.builder.AgentBuilder.InstallationListener} is informed about the
* resetting without undoing any code changes.
*
*
* Note: A reset class file transformer should not be reinstalled. Instead, the {@link AgentBuilder}
* which built the transformer should be asked to install a new transformer.
*
*
* Important: Most JVMs do not support changes of a class's structure after a class was already
* loaded. Therefore, it is typically required that this class file transformer was built while enabling
* {@link AgentBuilder#disableClassFormatChanges()}.
*
*
* @param instrumentation The instrumentation instance from which to deregister the transformer.
* @param redefinitionStrategy The redefinition to apply.
* @param redefinitionBatchAllocator The batch allocator to use.
* @param redefinitionListener The redefinition listener to apply.
* @return {@code true} if a reset was applied and this transformer was not previously removed.
*/
@SuppressWarnings("overloads")
boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener);
/**
*
* Deregisters this class file transformer and redefines any transformed class to its state without this
* class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled,
* only the {@link net.bytebuddy.agent.builder.AgentBuilder.InstallationListener} is informed about the
* resetting without undoing any code changes.
*
*
* Note: A reset class file transformer should not be reinstalled. Instead, the {@link AgentBuilder}
* which built the transformer should be asked to install a new transformer.
*
*
* Important: Most JVMs do not support changes of a class's structure after a class was already
* loaded. Therefore, it is typically required that this class file transformer was built while enabling
* {@link AgentBuilder#disableClassFormatChanges()}.
*
*
* @param instrumentation The instrumentation instance from which to deregister the transformer.
* @param redefinitionStrategy The redefinition to apply.
* @param redefinitionDiscoveryStrategy The discovery strategy for the types to reset.
* @param redefinitionBatchAllocator The batch allocator to use.
* @param redefinitionListener The redefinition listener to apply.
* @return {@code true} if a reset was applied and this transformer was not previously removed.
*/
boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener);
/**
*
* Deregisters this class file transformer and redefines any transformed class to its state without this
* class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled,
* only the {@link net.bytebuddy.agent.builder.AgentBuilder.InstallationListener} is informed about the
* resetting without undoing any code changes.
*
*
* Note: A reset class file transformer should not be reinstalled. Instead, the {@link AgentBuilder}
* which built the transformer should be asked to install a new transformer.
*
*
* Important: Most JVMs do not support changes of a class's structure after a class was already
* loaded. Therefore, it is typically required that this class file transformer was built while enabling
* {@link AgentBuilder#disableClassFormatChanges()}.
*
*
* @param instrumentation The instrumentation instance from which to deregister the transformer.
* @param classFileTransformer The actual class file transformer to deregister which might be {@code this} instance or any wrapper.
* @param redefinitionStrategy The redefinition to apply.
* @param redefinitionDiscoveryStrategy The discovery strategy for the types to reset.
* @param redefinitionBatchAllocator The batch allocator to use.
* @param redefinitionListener The redefinition listener to apply.
* @return {@code true} if a reset was applied and this transformer was not previously removed.
*/
boolean reset(Instrumentation instrumentation,
ResettableClassFileTransformer classFileTransformer,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener);
/**
* A {@link ResettableClassFileTransformer} which allows for substitution the actual class file transformer without
* changes in the order of the transformer chain.
*/
interface Substitutable extends ResettableClassFileTransformer {
/**
* Substitutes the current class file transformer.
*
* @param classFileTransformer The class file transformer to use.
*/
void substitute(ResettableClassFileTransformer classFileTransformer);
/**
* Returns the underlying non-substitutable class file transformer.
*
* @return The underlying non-substitutable class file transformer.
*/
ResettableClassFileTransformer unwrap();
}
/**
* An abstract base implementation of a {@link ResettableClassFileTransformer}.
*/
abstract class AbstractBase implements ResettableClassFileTransformer {
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation, AgentBuilder.RedefinitionStrategy redefinitionStrategy) {
return reset(instrumentation,
redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator.ForTotal.INSTANCE);
}
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator) {
return reset(instrumentation,
redefinitionStrategy,
redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener.NoOp.INSTANCE);
}
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy) {
return reset(instrumentation,
redefinitionStrategy,
redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.Listener.NoOp.INSTANCE);
}
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy) {
return reset(instrumentation,
redefinitionStrategy,
redefinitionDiscoveryStrategy,
redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener.NoOp.INSTANCE);
}
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener) {
return reset(instrumentation,
redefinitionStrategy,
redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator.ForTotal.INSTANCE,
redefinitionListener);
}
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener) {
return reset(instrumentation,
redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy.SinglePass.INSTANCE,
redefinitionBatchAllocator,
redefinitionListener);
}
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener) {
return reset(instrumentation,
this,
redefinitionStrategy,
redefinitionDiscoveryStrategy,
redefinitionBatchAllocator,
redefinitionListener);
}
}
/**
* Implements a resettable class file transformer that allows for the delegation of a transformation. Typically implemented
* when using a {@link net.bytebuddy.agent.builder.AgentBuilder.TransformerDecorator}.
*/
@HashCodeAndEqualsPlugin.Enhance
abstract class WithDelegation extends AbstractBase {
/**
* The class file transformer to delegate to.
*/
protected final ResettableClassFileTransformer classFileTransformer;
/**
* Creates a new delegating resettable class file transformer.
*
* @param classFileTransformer The class file transformer to delegate to.
*/
protected WithDelegation(ResettableClassFileTransformer classFileTransformer) {
this.classFileTransformer = classFileTransformer;
}
/**
* {@inheritDoc}
*/
public Iterator iterator(TypeDescription typeDescription,
@MaybeNull ClassLoader classLoader,
@MaybeNull JavaModule module,
@MaybeNull Class classBeingRedefined,
ProtectionDomain protectionDomain) {
return classFileTransformer.iterator(typeDescription, classLoader, module, classBeingRedefined, protectionDomain);
}
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation,
ResettableClassFileTransformer classFileTransformer,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener) {
return this.classFileTransformer.reset(instrumentation,
classFileTransformer,
redefinitionStrategy,
redefinitionDiscoveryStrategy,
redefinitionBatchAllocator,
redefinitionListener);
}
/**
* A standard implementation of a substitutable {@link ResettableClassFileTransformer}.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class Substitutable extends AbstractBase implements ResettableClassFileTransformer.Substitutable {
/**
* A dispatcher for invoking the correct transformer method.
*/
private static final Factory DISPATCHER = doPrivileged(Factory.CreationAction.INSTANCE);
/**
* The class file transformer to delegate to.
*/
protected volatile ResettableClassFileTransformer classFileTransformer;
/**
* Creates a new delegating resettable class file transformer.
*
* @param classFileTransformer The class file transformer to delegate to.
*/
protected Substitutable(ResettableClassFileTransformer classFileTransformer) {
this.classFileTransformer = classFileTransformer;
}
/**
* A proxy for {@code java.security.AccessController#doPrivileged} that is activated if available.
*
* @param action The action to execute from a privileged context.
* @param The type of the action's resolved value.
* @return The action's resolved value.
*/
@AccessControllerPlugin.Enhance
private static T doPrivileged(PrivilegedAction action) {
return action.run();
}
/**
* Creates a new substitutable class file transformer of another class file transformer.
*
* @param classFileTransformer The class file transformer to wrap.
* @return A substitutable version of the supplied class file transformer.
*/
public static Substitutable of(ResettableClassFileTransformer classFileTransformer) {
return DISPATCHER.make(classFileTransformer);
}
/**
* {@inheritDoc}
*/
public void substitute(ResettableClassFileTransformer classFileTransformer) {
while (classFileTransformer instanceof Substitutable) {
classFileTransformer = ((Substitutable) classFileTransformer).unwrap();
}
this.classFileTransformer = classFileTransformer;
}
/**
* {@inheritDoc}
*/
public ResettableClassFileTransformer unwrap() {
return classFileTransformer;
}
/**
* {@inheritDoc}
*/
public Iterator iterator(TypeDescription typeDescription,
@MaybeNull ClassLoader classLoader,
@MaybeNull JavaModule module,
@MaybeNull Class classBeingRedefined,
ProtectionDomain protectionDomain) {
return classFileTransformer.iterator(typeDescription, classLoader, module, classBeingRedefined, protectionDomain);
}
/**
* {@inheritDoc}
*/
public boolean reset(Instrumentation instrumentation,
ResettableClassFileTransformer classFileTransformer,
AgentBuilder.RedefinitionStrategy redefinitionStrategy,
AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy,
AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator,
AgentBuilder.RedefinitionStrategy.Listener redefinitionListener) {
return this.classFileTransformer.reset(instrumentation,
classFileTransformer,
redefinitionStrategy,
redefinitionDiscoveryStrategy,
redefinitionBatchAllocator,
redefinitionListener);
}
/**
* {@inheritDoc}
*/
public byte[] transform(ClassLoader classLoader, String internalName, Class classBeingRedefined, ProtectionDomain protectionDomain, byte[] binaryRepresentation) throws IllegalClassFormatException {
return classFileTransformer.transform(classLoader, internalName, classBeingRedefined, protectionDomain, binaryRepresentation);
}
/**
* A factory for creating a subclass of {@link WithDelegation.Substitutable} that supports the module system, if available.
*/
interface Factory {
/**
* Creates a new substitutable class file transformer.
*
* @param classFileTransformer The class file transformer to wrap.
* @return The wrapping class file transformer.
*/
Substitutable make(ResettableClassFileTransformer classFileTransformer);
/**
* An action to create a suitable factory.
*/
enum CreationAction implements PrivilegedAction {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "REC_CATCH_EXCEPTION", justification = "Exception should not be rethrown but trigger a fallback.")
public Factory run() {
try {
return new ForJava9CapableVm(new ByteBuddy()
.with(TypeValidation.DISABLED)
.subclass(WithDelegation.Substitutable.class)
.name(WithDelegation.Substitutable.class.getName() + "$ByteBuddy$ModuleSupport")
.method(named("transform").and(takesArgument(0, JavaType.MODULE.load())))
.intercept(MethodCall.invoke(ClassFileTransformer.class.getDeclaredMethod("transform",
JavaType.MODULE.load(),
ClassLoader.class,
String.class,
Class.class,
ProtectionDomain.class,
byte[].class)).onField("classFileTransformer").withAllArguments())
.make()
.load(WithDelegation.Substitutable.class.getClassLoader(),
ClassLoadingStrategy.Default.WRAPPER_PERSISTENT.with(WithDelegation.Substitutable.class.getProtectionDomain()))
.getLoaded()
.getDeclaredConstructor(ResettableClassFileTransformer.class));
} catch (Exception ignored) {
return ForLegacyVm.INSTANCE;
}
}
}
/**
* A factory for creating a substitutable class file transformer when the module system is supported.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForJava9CapableVm implements Factory {
/**
* The constructor to invoke.
*/
private final Constructor substitutable;
/**
* Creates a new Java 9 capable factory.
*
* @param substitutable The constructor to invoke.
*/
protected ForJava9CapableVm(Constructor substitutable) {
this.substitutable = substitutable;
}
/**
* {@inheritDoc}
*/
public Substitutable make(ResettableClassFileTransformer classFileTransformer) {
try {
return substitutable.newInstance(classFileTransformer);
} catch (IllegalAccessException exception) {
throw new IllegalStateException("Cannot access " + substitutable, exception);
} catch (InstantiationException exception) {
throw new IllegalStateException("Cannot instantiate " + substitutable.getDeclaringClass(), exception);
} catch (InvocationTargetException exception) {
throw new IllegalStateException("Cannot invoke " + substitutable, exception.getTargetException());
}
}
}
/**
* A factory for a substitutable class file transformer when the module system is not supported.
*/
enum ForLegacyVm implements Factory {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public Substitutable make(ResettableClassFileTransformer classFileTransformer) {
return new WithDelegation.Substitutable(classFileTransformer);
}
}
}
}
}
}