/*
* Copyright 2014 - 2018 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.implementation.
Implementation;
import net.bytebuddy.implementation.bind.
MethodDelegationBinder;
import net.bytebuddy.implementation.bytecode.assign.
Assigner;
import net.bytebuddy.implementation.bytecode.constant.
DefaultValue;
import java.lang.annotation.*;
/**
* Binds the parameter type's default value to the annotated parameter, i.e. {@code null} or a numeric value
* representing zero.
*
* @see net.bytebuddy.implementation.MethodDelegation
* @see net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder
*/
@
Documented
@
Retention(
RetentionPolicy.
RUNTIME)
@
Target(
ElementType.
PARAMETER)
public @interface
Empty {
/**
* A binder for the {@link net.bytebuddy.implementation.bind.annotation.Empty} annotation.
*/
enum
Binder implements
TargetMethodAnnotationDrivenBinder.
ParameterBinder<
Empty> {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public
Class<
Empty>
getHandledType() {
return
Empty.class;
}
/**
* {@inheritDoc}
*/
public
MethodDelegationBinder.
ParameterBinding<?>
bind(
AnnotationDescription.
Loadable<
Empty>
annotation,
MethodDescription source,
ParameterDescription target,
Implementation.
Target implementationTarget,
Assigner assigner,
Assigner.
Typing typing) {
return new
MethodDelegationBinder.
ParameterBinding.
Anonymous(
DefaultValue.
of(
target.
getType().
asErasure()));
}
}
}