net.bytebuddy/byte-buddy-dep/1.9.12 : net/bytebuddy/implementation/bind/annotation/Morph.java

Morph
http://bytebuddy.net/byte-buddy-dep: Byte Buddy is a Java library for creating Java classes at run time. This artifact is a build of Byte Buddy with a remaining dependency onto ASM. You should never depend on this module without repackaging Byte Buddy and ASM into your own namespace.
The Apache Software License, Version 2.0
Rafael Winterhalter
/*
 * Copyright 2014 - 2019 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.implementation.bind.annotation;

import net.bytebuddy.ByteBuddy;
import net.bytebuddy.ClassFileVersion;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.annotation.AnnotationDescription;
import net.bytebuddy.description.field.FieldDescription;
import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.description.method.MethodList;
import net.bytebuddy.description.method.ParameterDescription;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.dynamic.scaffold.InstrumentedType;
import net.bytebuddy.dynamic.scaffold.TypeValidation;
import net.bytebuddy.dynamic.scaffold.subclass.ConstructorStrategy;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.MethodAccessorFactory;
import net.bytebuddy.implementation.auxiliary.AuxiliaryType;
import net.bytebuddy.implementation.bind.MethodDelegationBinder;
import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
import net.bytebuddy.implementation.bytecode.Duplication;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.implementation.bytecode.TypeCreation;
import net.bytebuddy.implementation.bytecode.assign.Assigner;
import net.bytebuddy.implementation.bytecode.collection.ArrayAccess;
import net.bytebuddy.implementation.bytecode.constant.IntegerConstant;
import net.bytebuddy.implementation.bytecode.member.FieldAccess;
import net.bytebuddy.implementation.bytecode.member.MethodInvocation;
import net.bytebuddy.implementation.bytecode.member.MethodReturn;
import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
import net.bytebuddy.matcher.ElementMatchers;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

import java.io.Serializable;
import java.lang.annotation.*;
import java.util.Collections;

import static net.bytebuddy.matcher.ElementMatchers.*;

This annotation instructs Byte Buddy to inject a proxy class that calls a method's super method with explicit arguments. For this, the Binder needs to be installed for an interface type that takes an argument of the array type Object and returns a non-array type of Object. This is an alternative to using the SuperCall or DefaultCall annotations which call a super method using the same arguments as the intercepted method was invoked with. 
See Also: MethodDelegation
TargetMethodAnnotationDrivenBinder/**
 * This annotation instructs Byte Buddy to inject a proxy class that calls a method's super method with
 * explicit arguments. For this, the {@link Morph.Binder}
 * needs to be installed for an interface type that takes an argument of the array type {@link java.lang.Object} and
 * returns a non-array type of {@link java.lang.Object}. This is an alternative to using the
 * {@link net.bytebuddy.implementation.bind.annotation.SuperCall} or
 * {@link net.bytebuddy.implementation.bind.annotation.DefaultCall} annotations which call a super
 * method using the same arguments as the intercepted method was invoked with.
 *
 * @see net.bytebuddy.implementation.MethodDelegation
 * @see net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.PARAMETER)
public @interface Morph {

    Determines if the injected proxy for this parameter should be serializable.
Returns: true if the proxy should be serializable./**
     * Determines if the injected proxy for this parameter should be serializable.
     *
     * @return {@code true} if the proxy should be serializable.
     */
    boolean serializableProxy() default false;

    Determines if the proxy should attempt to invoke a default method. If the default method is ambiguous, use the defaultTarget() property instead which allows to determine an explicit interface on which the default method should be invoked on. If this other method is used, this property is ignored. 
Returns: true if a default method should be ignored./**
     * Determines if the proxy should attempt to invoke a default method. If the default method is ambiguous,
     * use the {@link Morph#defaultTarget()} property instead which allows to determine an explicit interface
     * on which the default method should be invoked on. If this other method is used, this property is ignored.
     *
     * @return {@code true} if a default method should be ignored.
     */
    boolean defaultMethod() default false;

    The type on which a default method should be invoked. When this property is not set and the defaultMethod() property is set to false, a normal super method invocation is attempted. 
Returns: The target interface of a default method call./**
     * The type on which a default method should be invoked. When this property is not set and the
     * {@link Morph#defaultMethod()} property is set to {@code false}, a normal super method invocation is attempted.
     *
     * @return The target interface of a default method call.
     */
    Class<?> defaultTarget() default void.class;

    A binder for the Morph annotation. /**
     * A binder for the {@link net.bytebuddy.implementation.bind.annotation.Morph} annotation.
     */
    @HashCodeAndEqualsPlugin.Enhance
    class Binder implements TargetMethodAnnotationDrivenBinder.ParameterBinder<Morph> {

        A reference to the serializable proxy method.
/**
         * A reference to the serializable proxy method.
         */
        private static final MethodDescription.InDefinedShape SERIALIZABLE_PROXY;

        A reference to the default method method.
/**
         * A reference to the default method method.
         */
        private static final MethodDescription.InDefinedShape DEFAULT_METHOD;

        A reference to the default target method.
/**
         * A reference to the default target method.
         */
        private static final MethodDescription.InDefinedShape DEFAULT_TARGET;

        /*
         * Looks up references for all annotation properties of the morph annotation.
         */
        static {
            MethodList<MethodDescription.InDefinedShape> methodList = TypeDescription.ForLoadedType.of(Morph.class).getDeclaredMethods();
            SERIALIZABLE_PROXY = methodList.filter(named("serializableProxy")).getOnly();
            DEFAULT_METHOD = methodList.filter(named("defaultMethod")).getOnly();
            DEFAULT_TARGET = methodList.filter(named("defaultTarget")).getOnly();
        }

        The method which is overridden for generating the proxy class.
/**
         * The method which is overridden for generating the proxy class.
         */
        private final MethodDescription forwardingMethod;

        Creates a new binder.
Params: forwardingMethod – The method which is overridden for generating the proxy class./**
         * Creates a new binder.
         *
         * @param forwardingMethod The method which is overridden for generating the proxy class.
         */
        protected Binder(MethodDescription forwardingMethod) {
            this.forwardingMethod = forwardingMethod;
        }

        Installs a given type for use on a Morph annotation. The given type must be an interface without any super interfaces and a single method which maps an Object array to a Object type. The use of generics is permitted. 
Params: type – The type to install.
Returns: A binder for the Morph annotation./**
         * Installs a given type for use on a {@link net.bytebuddy.implementation.bind.annotation.Morph}
         * annotation. The given type must be an interface without any super interfaces and a single method which
         * maps an {@link java.lang.Object} array to a {@link java.lang.Object} type. The use of generics is
         * permitted.
         *
         * @param type The type to install.
         * @return A binder for the {@link net.bytebuddy.implementation.bind.annotation.Morph}
         * annotation.
         */
        public static TargetMethodAnnotationDrivenBinder.ParameterBinder<Morph> install(Class<?> type) {
            return install(TypeDescription.ForLoadedType.of(type));
        }

        Installs a given type for use on a Morph annotation. The given type must be an interface without any super interfaces and a single method which maps an Object array to a Object type. The use of generics is permitted. 
Params: typeDescription – The type to install.
Returns: A binder for the Morph annotation./**
         * Installs a given type for use on a {@link net.bytebuddy.implementation.bind.annotation.Morph}
         * annotation. The given type must be an interface without any super interfaces and a single method which
         * maps an {@link java.lang.Object} array to a {@link java.lang.Object} type. The use of generics is
         * permitted.
         *
         * @param typeDescription The type to install.
         * @return A binder for the {@link net.bytebuddy.implementation.bind.annotation.Morph}
         * annotation.
         */
        public static TargetMethodAnnotationDrivenBinder.ParameterBinder<Morph> install(TypeDescription typeDescription) {
            return new Binder(onlyMethod(typeDescription));
        }

        Extracts the only method of a given type and validates to fit the constraints of the morph annotation.
Params: typeDescription – The type to extract the method from.
Returns: The only method after validation./**
         * Extracts the only method of a given type and validates to fit the constraints of the morph annotation.
         *
         * @param typeDescription The type to extract the method from.
         * @return The only method after validation.
         */
        private static MethodDescription onlyMethod(TypeDescription typeDescription) {
            if (!typeDescription.isInterface()) {
                throw new IllegalArgumentException(typeDescription + " is not an interface");
            } else if (!typeDescription.getInterfaces().isEmpty()) {
                throw new IllegalArgumentException(typeDescription + " must not extend other interfaces");
            } else if (!typeDescription.isPublic()) {
                throw new IllegalArgumentException(typeDescription + " is mot public");
            }
            MethodList<?> methodCandidates = typeDescription.getDeclaredMethods().filter(isAbstract());
            if (methodCandidates.size() != 1) {
                throw new IllegalArgumentException(typeDescription + " must declare exactly one abstract method");
            }
            MethodDescription methodDescription = methodCandidates.getOnly();
            if (!methodDescription.getReturnType().asErasure().represents(Object.class)) {
                throw new IllegalArgumentException(methodDescription + " does not return an Object-type");
            } else if (methodDescription.getParameters().size() != 1 || !methodDescription.getParameters().get(0).getType().asErasure().represents(Object[].class)) {
                throw new IllegalArgumentException(methodDescription + " does not take a single argument of type Object[]");
            }
            return methodDescription;
        }

        {@inheritDoc}
/**
         * {@inheritDoc}
         */
        public Class<Morph> getHandledType() {
            return Morph.class;
        }

        {@inheritDoc}
/**
         * {@inheritDoc}
         */
        public MethodDelegationBinder.ParameterBinding<?> bind(AnnotationDescription.Loadable<Morph> annotation,
                                                               MethodDescription source,
                                                               ParameterDescription target,
                                                               Implementation.Target implementationTarget,
                                                               Assigner assigner,
                                                               Assigner.Typing typing) {
            if (!target.getType().asErasure().equals(forwardingMethod.getDeclaringType())) {
                throw new IllegalStateException("Illegal use of @Morph for " + target + " which was installed for " + forwardingMethod.getDeclaringType());
            }
            Implementation.SpecialMethodInvocation specialMethodInvocation;
            TypeDescription typeDescription = annotation.getValue(DEFAULT_TARGET).resolve(TypeDescription.class);
            if (typeDescription.represents(void.class) && !annotation.getValue(DEFAULT_METHOD).resolve(Boolean.class)) {
                specialMethodInvocation = implementationTarget.invokeSuper(source.asSignatureToken());
            } else {
                specialMethodInvocation = (typeDescription.represents(void.class)
                        ? DefaultMethodLocator.Implicit.INSTANCE
                        : new DefaultMethodLocator.Explicit(typeDescription)).resolve(implementationTarget, source);
            }
            return specialMethodInvocation.isValid()
                    ? new MethodDelegationBinder.ParameterBinding.Anonymous(new RedirectionProxy(forwardingMethod.getDeclaringType().asErasure(),
                    implementationTarget.getInstrumentedType(),
                    specialMethodInvocation,
                    assigner,
                    annotation.getValue(SERIALIZABLE_PROXY).resolve(Boolean.class)))
                    : MethodDelegationBinder.ParameterBinding.Illegal.INSTANCE;
        }

        A default method locator is responsible for looking up a default method to a given source method.
/**
         * A default method locator is responsible for looking up a default method to a given source method.
         */
        protected interface DefaultMethodLocator {

            Locates the correct default method to a given source method.
Params: implementationTarget – The current implementation target.
source –               The source method for which a default method should be looked up.
Returns: A special method invocation of the default method or an illegal special method invocation,
if no suitable invocation could be located./**
             * Locates the correct default method to a given source method.
             *
             * @param implementationTarget The current implementation target.
             * @param source               The source method for which a default method should be looked up.
             * @return A special method invocation of the default method or an illegal special method invocation,
             * if no suitable invocation could be located.
             */
            Implementation.SpecialMethodInvocation resolve(Implementation.Target implementationTarget,
                                                           MethodDescription source);

            An implicit default method locator that only permits the invocation of a default method if the source
method itself represents a method that was defined on a default method interface.
/**
             * An implicit default method locator that only permits the invocation of a default method if the source
             * method itself represents a method that was defined on a default method interface.
             */
            enum Implicit implements DefaultMethodLocator {

                The singleton instance.
/**
                 * The singleton instance.
                 */
                INSTANCE;

                {@inheritDoc}
/**
                 * {@inheritDoc}
                 */
                public Implementation.SpecialMethodInvocation resolve(Implementation.Target implementationTarget, MethodDescription source) {
                    return implementationTarget.invokeDefault(source.asSignatureToken());
                }
            }

            An explicit default method locator attempts to look up a default method in the specified interface type.
/**
             * An explicit default method locator attempts to look up a default method in the specified interface type.
             */
            @HashCodeAndEqualsPlugin.Enhance
            class Explicit implements DefaultMethodLocator {

                A description of the type on which the default method should be invoked.
/**
                 * A description of the type on which the default method should be invoked.
                 */
                private final TypeDescription typeDescription;

                Creates a new explicit default method locator.
Params: typeDescription – The actual target interface as explicitly defined by DefaultCall.targetType()./**
                 * Creates a new explicit default method locator.
                 *
                 * @param typeDescription The actual target interface as explicitly defined by
                 *                        {@link DefaultCall#targetType()}.
                 */
                public Explicit(TypeDescription typeDescription) {
                    this.typeDescription = typeDescription;
                }

                {@inheritDoc}
/**
                 * {@inheritDoc}
                 */
                public Implementation.SpecialMethodInvocation resolve(Implementation.Target implementationTarget, MethodDescription source) {
                    if (!typeDescription.isInterface()) {
                        throw new IllegalStateException(source + " method carries default method call parameter on non-interface type");
                    }
                    return implementationTarget.invokeDefault(source.asSignatureToken(), typeDescription);
                }
            }
        }

        A proxy that implements the installed interface in order to allow for a morphed super method invocation.
/**
         * A proxy that implements the installed interface in order to allow for a morphed super method invocation.
         */
        @HashCodeAndEqualsPlugin.Enhance
        protected static class RedirectionProxy implements AuxiliaryType, StackManipulation {

            The name of the field that carries an instance for invoking a super method on.
/**
             * The name of the field that carries an instance for invoking a super method on.
             */
            protected static final String FIELD_NAME = "target";

            The interface type that is implemented by the generated proxy.
/**
             * The interface type that is implemented by the generated proxy.
             */
            private final TypeDescription morphingType;

            The type that is instrumented on which the super method is invoked.
/**
             * The type that is instrumented on which the super method is invoked.
             */
            private final TypeDescription instrumentedType;

            The special method invocation to be executed by the morphing type via an accessor on the
instrumented type.
/**
             * The special method invocation to be executed by the morphing type via an accessor on the
             * instrumented type.
             */
            private final Implementation.SpecialMethodInvocation specialMethodInvocation;

            The assigner to use.
/**
             * The assigner to use.
             */
            private final Assigner assigner;

            Determines if the generated proxy should be Serializable. /**
             * Determines if the generated proxy should be {@link java.io.Serializable}.
             */
            private final boolean serializableProxy;

            Creates a new redirection proxy.
Params: morphingType –            The interface type that is implemented by the generated proxy.
instrumentedType –        The type that is instrumented on which the super method is invoked.
specialMethodInvocation – The special method invocation to be executed by the morphing type via
                               an accessor on the instrumented type.
assigner –                The assigner to use.
serializableProxy –  true if the proxy should be serializable./**
             * Creates a new redirection proxy.
             *
             * @param morphingType            The interface type that is implemented by the generated proxy.
             * @param instrumentedType        The type that is instrumented on which the super method is invoked.
             * @param specialMethodInvocation The special method invocation to be executed by the morphing type via
             *                                an accessor on the instrumented type.
             * @param assigner                The assigner to use.
             * @param serializableProxy       {@code true} if the proxy should be serializable.
             */
            protected RedirectionProxy(TypeDescription morphingType,
                                       TypeDescription instrumentedType,
                                       Implementation.SpecialMethodInvocation specialMethodInvocation,
                                       Assigner assigner,
                                       boolean serializableProxy) {
                this.morphingType = morphingType;
                this.instrumentedType = instrumentedType;
                this.specialMethodInvocation = specialMethodInvocation;
                this.assigner = assigner;
                this.serializableProxy = serializableProxy;
            }

            {@inheritDoc}
/**
             * {@inheritDoc}
             */
            public DynamicType make(String auxiliaryTypeName,
                                    ClassFileVersion classFileVersion,
                                    MethodAccessorFactory methodAccessorFactory) {
                return new ByteBuddy(classFileVersion)
                        .with(TypeValidation.DISABLED)
                        .subclass(morphingType, ConstructorStrategy.Default.NO_CONSTRUCTORS)
                        .name(auxiliaryTypeName)
                        .modifiers(DEFAULT_TYPE_MODIFIER)
                        .implement(serializableProxy ? new Class<?>[]{Serializable.class} : new Class<?>[0])
                        .defineConstructor().withParameters(specialMethodInvocation.getMethodDescription().isStatic()
                                ? Collections.<TypeDescription>emptyList()
                                : Collections.singletonList(instrumentedType))
                        .intercept(specialMethodInvocation.getMethodDescription().isStatic()
                                ? StaticFieldConstructor.INSTANCE
                                : new InstanceFieldConstructor(instrumentedType))
                        .method(ElementMatchers.<MethodDescription>isAbstract().and(isDeclaredBy(morphingType)))
                        .intercept(new MethodCall(methodAccessorFactory.registerAccessorFor(specialMethodInvocation, MethodAccessorFactory.AccessType.DEFAULT), assigner))
                        .make();
            }

            {@inheritDoc}
/**
             * {@inheritDoc}
             */
            public boolean isValid() {
                return true;
            }

            {@inheritDoc}
/**
             * {@inheritDoc}
             */
            public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
                TypeDescription forwardingType = implementationContext.register(this);
                return new Compound(
                        TypeCreation.of(forwardingType),
                        Duplication.SINGLE,
                        specialMethodInvocation.getMethodDescription().isStatic()
                                ? Trivial.INSTANCE
                                : MethodVariableAccess.loadThis(),
                        MethodInvocation.invoke(forwardingType.getDeclaredMethods().filter(isConstructor()).getOnly())
                ).apply(methodVisitor, implementationContext);
            }

            Creates an instance of the proxy when instrumenting a static method.
/**
             * Creates an instance of the proxy when instrumenting a static method.
             */
            protected enum StaticFieldConstructor implements Implementation {

                The singleton instance.
/**
                 * The singleton instance.
                 */
                INSTANCE;

                A reference of the Object type default constructor. /**
                 * A reference of the {@link Object} type default constructor.
                 */
                private final MethodDescription objectTypeDefaultConstructor;

                Creates the constructor call singleton.
/**
                 * Creates the constructor call singleton.
                 */
                StaticFieldConstructor() {
                    objectTypeDefaultConstructor = TypeDescription.OBJECT.getDeclaredMethods()
                            .filter(isConstructor())
                            .getOnly();
                }

                {@inheritDoc}
/**
                 * {@inheritDoc}
                 */
                public InstrumentedType prepare(InstrumentedType instrumentedType) {
                    return instrumentedType;
                }

                {@inheritDoc}
/**
                 * {@inheritDoc}
                 */
                public ByteCodeAppender appender(Target implementationTarget) {
                    return new ByteCodeAppender.Simple(MethodVariableAccess.loadThis(), MethodInvocation.invoke(objectTypeDefaultConstructor), MethodReturn.VOID);
                }
            }

            Creates an instance of the proxy when instrumenting an instance method.
/**
             * Creates an instance of the proxy when instrumenting an instance method.
             */
            @HashCodeAndEqualsPlugin.Enhance
            protected static class InstanceFieldConstructor implements Implementation {

                The instrumented type.
/**
                 * The instrumented type.
                 */
                private final TypeDescription instrumentedType;

                Creates a new instance field constructor implementation.
Params: instrumentedType – The instrumented type./**
                 * Creates a new instance field constructor implementation.
                 *
                 * @param instrumentedType The instrumented type.
                 */
                protected InstanceFieldConstructor(TypeDescription instrumentedType) {
                    this.instrumentedType = instrumentedType;
                }

                {@inheritDoc}
/**
                 * {@inheritDoc}
                 */
                public InstrumentedType prepare(InstrumentedType instrumentedType) {
                    return instrumentedType.withField(new FieldDescription.Token(RedirectionProxy.FIELD_NAME,
                            Opcodes.ACC_FINAL | Opcodes.ACC_PRIVATE,
                            this.instrumentedType.asGenericType()));
                }

                {@inheritDoc}
/**
                 * {@inheritDoc}
                 */
                public ByteCodeAppender appender(Target implementationTarget) {
                    return new Appender(implementationTarget);
                }

                The byte code appender that implements the constructor.
/**
                 * The byte code appender that implements the constructor.
                 */
                @HashCodeAndEqualsPlugin.Enhance
                protected static class Appender implements ByteCodeAppender {

                    The field that carries the instance on which the super method is invoked.
/**
                     * The field that carries the instance on which the super method is invoked.
                     */
                    private final FieldDescription fieldDescription;

                    Creates a new appender.
Params: implementationTarget – The current implementation target./**
                     * Creates a new appender.
                     *
                     * @param implementationTarget The current implementation target.
                     */
                    protected Appender(Target implementationTarget) {
                        fieldDescription = implementationTarget.getInstrumentedType()
                                .getDeclaredFields()
                                .filter((named(RedirectionProxy.FIELD_NAME)))
                                .getOnly();
                    }

                    {@inheritDoc}
/**
                     * {@inheritDoc}
                     */
                    public Size apply(MethodVisitor methodVisitor,
                                      Context implementationContext,
                                      MethodDescription instrumentedMethod) {
                        StackManipulation.Size stackSize = new StackManipulation.Compound(
                                MethodVariableAccess.loadThis(),
                                MethodInvocation.invoke(StaticFieldConstructor.INSTANCE.objectTypeDefaultConstructor),
                                MethodVariableAccess.allArgumentsOf(instrumentedMethod).prependThisReference(),
                                FieldAccess.forField(fieldDescription).write(),
                                MethodReturn.VOID
                        ).apply(methodVisitor, implementationContext);
                        return new Size(stackSize.getMaximalSize(), instrumentedMethod.getStackSize());
                    }
                }
            }

            Implements a the method call of the morphing method.
/**
             * Implements a the method call of the morphing method.
             */
            @HashCodeAndEqualsPlugin.Enhance
            protected static class MethodCall implements Implementation {

                The accessor method to invoke from the proxy's method.
/**
                 * The accessor method to invoke from the proxy's method.
                 */
                private final MethodDescription accessorMethod;

                The assigner to be used.
/**
                 * The assigner to be used.
                 */
                private final Assigner assigner;

                Creates a new method call implementation for a proxy method.
Params: accessorMethod – The accessor method to invoke from the proxy's method.
assigner –       The assigner to be used./**
                 * Creates a new method call implementation for a proxy method.
                 *
                 * @param accessorMethod The accessor method to invoke from the proxy's method.
                 * @param assigner       The assigner to be used.
                 */
                protected MethodCall(MethodDescription accessorMethod, Assigner assigner) {
                    this.accessorMethod = accessorMethod;
                    this.assigner = assigner;
                }

                {@inheritDoc}
/**
                 * {@inheritDoc}
                 */
                public InstrumentedType prepare(InstrumentedType instrumentedType) {
                    return instrumentedType;
                }

                {@inheritDoc}
/**
                 * {@inheritDoc}
                 */
                public ByteCodeAppender appender(Target implementationTarget) {
                    return new Appender(implementationTarget);
                }

                The byte code appender to implement the method.
/**
                 * The byte code appender to implement the method.
                 */
                @HashCodeAndEqualsPlugin.Enhance(includeSyntheticFields = true)
                protected class Appender implements ByteCodeAppender {

                    The proxy type.
/**
                     * The proxy type.
                     */
                    private final TypeDescription typeDescription;

                    Creates a new appender.
Params: implementationTarget – The current implementation target./**
                     * Creates a new appender.
                     *
                     * @param implementationTarget The current implementation target.
                     */
                    protected Appender(Target implementationTarget) {
                        typeDescription = implementationTarget.getInstrumentedType();
                    }

                    {@inheritDoc}
/**
                     * {@inheritDoc}
                     */
                    public Size apply(MethodVisitor methodVisitor,
                                      Context implementationContext,
                                      MethodDescription instrumentedMethod) {
                        StackManipulation arrayReference = MethodVariableAccess.REFERENCE.loadFrom(1);
                        StackManipulation[] parameterLoading = new StackManipulation[accessorMethod.getParameters().size()];
                        int index = 0;
                        for (TypeDescription.Generic parameterType : accessorMethod.getParameters().asTypeList()) {
                            parameterLoading[index] = new StackManipulation.Compound(arrayReference,
                                    IntegerConstant.forValue(index),
                                    ArrayAccess.REFERENCE.load(),
                                    assigner.assign(TypeDescription.Generic.OBJECT, parameterType, Assigner.Typing.DYNAMIC));
                            index++;
                        }
                        StackManipulation.Size stackSize = new StackManipulation.Compound(
                                accessorMethod.isStatic()
                                        ? Trivial.INSTANCE
                                        : new StackManipulation.Compound(
                                        MethodVariableAccess.loadThis(),
                                        FieldAccess.forField(typeDescription.getDeclaredFields()
                                                .filter((named(RedirectionProxy.FIELD_NAME)))
                                                .getOnly()).read()),
                                new StackManipulation.Compound(parameterLoading),
                                MethodInvocation.invoke(accessorMethod),
                                assigner.assign(accessorMethod.getReturnType(), instrumentedMethod.getReturnType(), Assigner.Typing.DYNAMIC),
                                MethodReturn.REFERENCE
                        ).apply(methodVisitor, implementationContext);
                        return new Size(stackSize.getMaximalSize(), instrumentedMethod.getStackSize());
                    }
                }
            }
        }
    }
}
Params:	type – The type to install.
Returns:	A binder for the `Morph` annotation.
Params:	typeDescription – The type to install.
Returns:	A binder for the `Morph` annotation.
Params:	typeDescription – The type to extract the method from.
Returns:	The only method after validation.
Params:	implementationTarget – The current implementation target. source – The source method for which a default method should be looked up.
Returns:	A special method invocation of the default method or an illegal special method invocation, if no suitable invocation could be located.
/

net.bytebuddy/ byte-buddy-dep/ 1.9.12/ net/bytebuddy/implementation/bind/annotation/Morph.java
