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/*
 * 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.implementation.bind.annotation;

import net.bytebuddy.description.annotation.AnnotationDescription;
import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.description.method.ParameterDescription;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bind.MethodDelegationBinder;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.implementation.bytecode.assign.Assigner;
import net.bytebuddy.implementation.bytecode.constant.NullConstant;
import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;

import java.lang.annotation.*;

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

/**
 * 

* Parameters that are annotated with this annotation will be assigned a reference to the instrumented object, if * the instrumented method is not static. Otherwise, the method with this parameter annotation will be excluded from * the list of possible binding candidates of the static source method. *

*

* Important: Don't confuse this annotation with {@link net.bytebuddy.asm.Advice.This} or * {@link net.bytebuddy.asm.MemberSubstitution.This}. This annotation should be used with * {@link net.bytebuddy.implementation.MethodDelegation} only. *

* * @see net.bytebuddy.implementation.MethodDelegation * @see net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder */ @Documented @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.PARAMETER) public @interface This { /** * Determines if the annotated parameter should be bound to {@code null} when intercepting a {@code static} method. * * @return {@code true} if the annotated parameter should be bound to {@code null} as a fallback. */ boolean optional() default false; /** * A binder for handling the * {@link net.bytebuddy.implementation.bind.annotation.This} * annotation. * * @see TargetMethodAnnotationDrivenBinder */ enum Binder implements TargetMethodAnnotationDrivenBinder.ParameterBinder { /** * The singleton instance. */ INSTANCE; /** * A description of the {@link Pipe#serializableProxy()} method. */ private static final MethodDescription.InDefinedShape OPTIONAL = TypeDescription.ForLoadedType.of(This.class) .getDeclaredMethods() .filter(named("optional")) .getOnly(); /** * {@inheritDoc} */ public Class getHandledType() { return This.class; } /** * {@inheritDoc} */ public MethodDelegationBinder.ParameterBinding bind(AnnotationDescription.Loadable annotation, MethodDescription source, ParameterDescription target, Implementation.Target implementationTarget, Assigner assigner, Assigner.Typing typing) { if (target.getType().isPrimitive()) { throw new IllegalStateException(target + " uses a primitive type with a @This annotation"); } else if (target.getType().isArray()) { throw new IllegalStateException(target + " uses an array type with a @This annotation"); } else if (source.isStatic() && !annotation.getValue(OPTIONAL).resolve(Boolean.class)) { return MethodDelegationBinder.ParameterBinding.Illegal.INSTANCE; } return new MethodDelegationBinder.ParameterBinding.Anonymous(source.isStatic() ? NullConstant.INSTANCE : new StackManipulation.Compound(MethodVariableAccess.loadThis(), assigner.assign(implementationTarget.getInstrumentedType().asGenericType(), target.getType(), typing))); } } }




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