com.fitbur.bytebuddy.implementation.bind.annotation.AllArguments Maven / Gradle / Ivy
package com.fitbur.bytebuddy.implementation.bind.annotation;
import com.fitbur.bytebuddy.description.annotation.AnnotationDescription;
import com.fitbur.bytebuddy.description.method.MethodDescription;
import com.fitbur.bytebuddy.description.method.ParameterDescription;
import com.fitbur.bytebuddy.description.type.TypeDescription;
import com.fitbur.bytebuddy.implementation.Implementation;
import com.fitbur.bytebuddy.implementation.bind.MethodDelegationBinder;
import com.fitbur.bytebuddy.implementation.bytecode.StackManipulation;
import com.fitbur.bytebuddy.implementation.bytecode.assign.Assigner;
import com.fitbur.bytebuddy.implementation.bytecode.collection.ArrayFactory;
import com.fitbur.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
import com.fitbur.bytebuddy.utility.CompoundList;
import java.lang.annotation.*;
import java.util.ArrayList;
import java.util.List;
/**
* Parameters that are annotated with this annotation will be assigned a collection (or an array) containing
* all arguments of the source method. Currently, this annotation supports the following collection types:
*
* - Array
*
*
* By default, this annotation applies a
* {@link com.fitbur.bytebuddy.implementation.bind.annotation.AllArguments.Assignment#STRICT}
* assignment of the source method's parameters to the array. This implies that parameters that are not assignable to
* the annotated array's component type make the method with this parameter unbindable. To avoid this, you can
* use a {@link com.fitbur.bytebuddy.implementation.bind.annotation.AllArguments.Assignment#SLACK} assignment
* which simply skips non-assignable values instead.
*
* @see com.fitbur.bytebuddy.implementation.MethodDelegation
* @see com.fitbur.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder
* @see com.fitbur.bytebuddy.implementation.bind.annotation.RuntimeType
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.PARAMETER)
public @interface AllArguments {
/**
* Defines the type of {@link com.fitbur.bytebuddy.implementation.bind.annotation.AllArguments.Assignment}
* type that is applied for filling the annotated array with values.
*
* @return The assignment handling to be applied for the annotated parameter.
*/
Assignment value() default Assignment.STRICT;
/**
* Determines if the array should contain the instance that defines the intercepted value when intercepting
* a non-static method.
*
* @return {@code true} if the instance on which the intercepted method should be invoked should be
* included in the array containing the arguments.
*/
boolean includeSelf() default false;
/**
* A directive for how an {@link com.fitbur.bytebuddy.implementation.bind.annotation.AllArguments}
* annotation on an array is to be interpreted.
*/
enum Assignment {
/**
* A strict assignment attempts to include all parameter values of the source method. If only one of these
* parameters is not assignable to the component type of the annotated array, the method is considered as
* non-bindable.
*/
STRICT(true),
/**
* Other than a {@link com.fitbur.bytebuddy.implementation.bind.annotation.AllArguments.Assignment#STRICT}
* assignment, a slack assignment simply ignores non-bindable parameters and does not include them in the target
* array. In the most extreme case where no source method parameter is assignable to the component type
* of the annotated array, the array that is assigned to the target parameter is empty.
*/
SLACK(false);
/**
* Determines if this assignment is strict.
*/
private final boolean strict;
/**
* Creates a new assignment type.
*
* @param strict {@code true} if this assignment is strict.
*/
Assignment(boolean strict) {
this.strict = strict;
}
/**
* Returns {@code true} if this assignment is strict.
*
* @return {@code true} if this assignment is strict.
*/
protected boolean isStrict() {
return strict;
}
@Override
public String toString() {
return "AllArguments.Assignment." + name();
}
}
/**
* A binder for handling the
* {@link com.fitbur.bytebuddy.implementation.bind.annotation.AllArguments}
* annotation.
*
* @see TargetMethodAnnotationDrivenBinder
*/
enum Binder implements TargetMethodAnnotationDrivenBinder.ParameterBinder {
/**
* The singleton instance.
*/
INSTANCE;
@Override
public Class getHandledType() {
return AllArguments.class;
}
@Override
public MethodDelegationBinder.ParameterBinding bind(AnnotationDescription.Loadable annotation,
MethodDescription source,
ParameterDescription target,
Implementation.Target implementationTarget,
Assigner assigner) {
if (!target.getType().isArray()) {
throw new IllegalStateException("Expected an array type for all argument annotation on " + source);
}
ArrayFactory arrayFactory = ArrayFactory.forType(target.getType().getComponentType());
boolean includeThis = !source.isStatic() && annotation.loadSilent().includeSelf();
List stackManipulations = new ArrayList(source.getParameters().size() + (includeThis ? 1 : 0));
int offset = source.isStatic() || includeThis ? 0 : 1;
for (TypeDescription.Generic sourceParameter : includeThis
? CompoundList.of(implementationTarget.getInstrumentedType().asGenericType(), source.getParameters().asTypeList())
: source.getParameters().asTypeList()) {
StackManipulation stackManipulation = new StackManipulation.Compound(
MethodVariableAccess.of(sourceParameter).loadOffset(offset),
assigner.assign(sourceParameter, arrayFactory.getComponentType(), RuntimeType.Verifier.check(target)));
if (stackManipulation.isValid()) {
stackManipulations.add(stackManipulation);
} else if (annotation.loadSilent().value().isStrict()) {
return MethodDelegationBinder.ParameterBinding.Illegal.INSTANCE;
}
offset += sourceParameter.getStackSize().getSize();
}
return new MethodDelegationBinder.ParameterBinding.Anonymous(arrayFactory.withValues(stackManipulations));
}
@Override
public String toString() {
return "AllArguments.Binder." + name();
}
}
}