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.
/*
* 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.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.ArgumentTypeResolver;
import net.bytebuddy.implementation.bind.MethodDelegationBinder;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.implementation.bytecode.assign.Assigner;
import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
import java.lang.annotation.*;
Parameters that are annotated with this annotation will be assigned the value of the parameter of the source method with the given parameter. For example, if source method foo(String, Integer) is bound to target method bar(@Argument(1) Integer), the second parameter of foo will be bound to the first argument of bar.
If a source method has less parameters than specified by value(), the method carrying this parameter annotation is excluded from the list of possible binding candidates to this particular source method. The same happens, if the source method parameter at the specified index is not assignable to the annotated parameter. See Also:
/**
* Parameters that are annotated with this annotation will be assigned the value of the parameter of the source method
* with the given parameter. For example, if source method {@code foo(String, Integer)} is bound to target method
* {@code bar(@Argument(1) Integer)}, the second parameter of {@code foo} will be bound to the first argument of
* {@code bar}.
* <p> </p>
* If a source method has less parameters than specified by {@link Argument#value()}, the method carrying this parameter
* annotation is excluded from the list of possible binding candidates to this particular source method. The same happens,
* if the source method parameter at the specified index is not assignable to the annotated parameter.
*
* @see net.bytebuddy.implementation.MethodDelegation
* @see net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder
* @see net.bytebuddy.implementation.bind.annotation.RuntimeType
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.PARAMETER)
public @interface Argument {
The index of the parameter of the source method that should be bound to this parameter.
Returns: The required parameter index.
/**
* The index of the parameter of the source method that should be bound to this parameter.
*
* @return The required parameter index.
*/
int value();
Determines if the argument binding is to be considered by a ArgumentTypeResolver for resolving ambiguous bindings of two methods. If BindingMechanic.UNIQUE, of two bindable target methods such as for example foo(String) and bar(Object), the foo method would be considered as dominant over the bar method because of its more specific argument type. As a side effect, only one parameter of any target method can be bound to a source method parameter with a given index unless the BindingMechanic.ANONYMOUS option is used for any other binding. See Also: Returns: The binding type that should be applied to this parameter binding.
/**
* Determines if the argument binding is to be considered by a
* {@link net.bytebuddy.implementation.bind.ArgumentTypeResolver}
* for resolving ambiguous bindings of two methods. If
* {@link net.bytebuddy.implementation.bind.annotation.Argument.BindingMechanic#UNIQUE},
* of two bindable target methods such as for example {@code foo(String)} and {@code bar(Object)}, the {@code foo}
* method would be considered as dominant over the {@code bar} method because of its more specific argument type. As
* a side effect, only one parameter of any target method can be bound to a source method parameter with a given
* index unless the {@link net.bytebuddy.implementation.bind.annotation.Argument.BindingMechanic#ANONYMOUS}
* option is used for any other binding.
*
* @return The binding type that should be applied to this parameter binding.
* @see net.bytebuddy.implementation.bind.ArgumentTypeResolver
*/
BindingMechanic bindingMechanic() default BindingMechanic.UNIQUE;
Determines if a parameter binding should be considered for resolving ambiguous method bindings.
See Also: - bindingMechanic.bindingMechanic()
- ArgumentTypeResolver
/**
* Determines if a parameter binding should be considered for resolving ambiguous method bindings.
*
* @see Argument#bindingMechanic()
* @see net.bytebuddy.implementation.bind.ArgumentTypeResolver
*/
enum BindingMechanic {
The binding is unique, i.e. only one such binding must be present among all parameters of a method. As a consequence, the binding can be latter identified by an AmbiguityResolver. /**
* The binding is unique, i.e. only one such binding must be present among all parameters of a method. As a
* consequence, the binding can be latter identified by an
* {@link net.bytebuddy.implementation.bind.MethodDelegationBinder.AmbiguityResolver}.
*/
UNIQUE {
@Override
protected MethodDelegationBinder.ParameterBinding<?> makeBinding(TypeDescription.Generic source,
TypeDescription.Generic target,
int sourceParameterIndex,
Assigner assigner,
Assigner.Typing typing,
int parameterOffset) {
return MethodDelegationBinder.ParameterBinding.Unique.of(
new StackManipulation.Compound(
MethodVariableAccess.of(source).loadFrom(parameterOffset),
assigner.assign(source, target, typing)),
new ArgumentTypeResolver.ParameterIndexToken(sourceParameterIndex)
);
}
},
The binding is anonymous, i.e. it can be present on several parameters of the same method.
/**
* The binding is anonymous, i.e. it can be present on several parameters of the same method.
*/
ANONYMOUS {
@Override
protected MethodDelegationBinder.ParameterBinding<?> makeBinding(TypeDescription.Generic source,
TypeDescription.Generic target,
int sourceParameterIndex,
Assigner assigner,
Assigner.Typing typing,
int parameterOffset) {
return new MethodDelegationBinder.ParameterBinding.Anonymous(
new StackManipulation.Compound(MethodVariableAccess.of(source).loadFrom(parameterOffset), assigner.assign(source, target, typing))
);
}
};
Creates a binding that corresponds to this binding mechanic.
Params: - source – The source type to be bound.
- target – The target type the
sourceType is to be bound to. - sourceParameterIndex – The index of the source parameter.
- assigner – The assigner that is used to perform the assignment.
- typing – Indicates if dynamic type castings should be attempted for incompatible assignments.
- parameterOffset – The offset of the source method's parameter.
Returns: A binding considering the chosen binding mechanic.
/**
* Creates a binding that corresponds to this binding mechanic.
*
* @param source The source type to be bound.
* @param target The target type the {@code sourceType} is to be bound to.
* @param sourceParameterIndex The index of the source parameter.
* @param assigner The assigner that is used to perform the assignment.
* @param typing Indicates if dynamic type castings should be attempted for incompatible assignments.
* @param parameterOffset The offset of the source method's parameter.
* @return A binding considering the chosen binding mechanic.
*/
protected abstract MethodDelegationBinder.ParameterBinding<?> makeBinding(TypeDescription.Generic source,
TypeDescription.Generic target,
int sourceParameterIndex,
Assigner assigner,
Assigner.Typing typing,
int parameterOffset);
}
A binder for handling the Argument annotation. See Also:
/**
* A binder for handling the
* {@link net.bytebuddy.implementation.bind.annotation.Argument}
* annotation.
*
* @see TargetMethodAnnotationDrivenBinder
*/
enum Binder implements TargetMethodAnnotationDrivenBinder.ParameterBinder<Argument> {
The singleton instance.
/**
* The singleton instance.
*/
INSTANCE;
{@inheritDoc}
/**
* {@inheritDoc}
*/
public Class<Argument> getHandledType() {
return Argument.class;
}
{@inheritDoc}
/**
* {@inheritDoc}
*/
public MethodDelegationBinder.ParameterBinding<?> bind(AnnotationDescription.Loadable<Argument> annotation,
MethodDescription source,
ParameterDescription target,
Implementation.Target implementationTarget,
Assigner assigner,
Assigner.Typing typing) {
Argument argument = annotation.loadSilent();
if (argument.value() < 0) {
throw new IllegalArgumentException("@Argument annotation on " + target + " specifies negative index");
} else if (source.getParameters().size() <= argument.value()) {
return MethodDelegationBinder.ParameterBinding.Illegal.INSTANCE;
}
return argument.bindingMechanic().makeBinding(source.getParameters().get(argument.value()).getType(),
target.getType(),
argument.value(),
assigner,
typing,
source.getParameters().get(argument.value()).getOffset());
}
}
}