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The official Couchbase JVM Core IO Library
/*
* 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;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.field.FieldDescription;
import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.description.method.MethodList;
import net.bytebuddy.description.type.TypeDefinition;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.scaffold.FieldLocator;
import net.bytebuddy.dynamic.scaffold.InstrumentedType;
import net.bytebuddy.dynamic.scaffold.MethodGraph;
import net.bytebuddy.implementation.bind.MethodDelegationBinder;
import net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder;
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.member.FieldAccess;
import net.bytebuddy.implementation.bytecode.member.MethodInvocation;
import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
import net.bytebuddy.matcher.ElementMatcher;
import net.bytebuddy.utility.CompoundList;
import net.bytebuddy.utility.RandomString;
import net.bytebuddy.jar.asm.MethodVisitor;
import net.bytebuddy.jar.asm.Opcodes;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import static net.bytebuddy.matcher.ElementMatchers.*;
/**
* This implementation delegates a method call to another method which can either be {@code static} by providing
* a reference to a {@link java.lang.Class} or an instance method when another object is provided. The potential
* targets of the method delegation can further be filtered by applying a filter. The method delegation can be
* customized by invoking the {@code MethodDelegation}'s several builder methods.
*
* Without any customization, the method delegation will work as follows:
*
* Binding an instrumented method to a given delegate method
*
* A method will be bound parameter by parameter. Considering a method {@code Foo#bar} being bound to a method
* {@code Qux#baz}, the method delegation will be decided on basis of the following annotations:
*
* - {@link net.bytebuddy.implementation.bind.annotation.Argument}:
* This annotation will bind the {@code n}-th parameter of {@code Foo#bar} to that parameter of {@code Qux#baz}that
* is annotated with this annotation where {@code n} is the obligatory argument of the {@code @Argument} annotation.
* - {@link net.bytebuddy.implementation.bind.annotation.AllArguments}:
* This annotation will assign a collection of all parameters of {@code Foo#bar} to that parameter of {@code Qux#baz}
* that is annotated with {@code AllArguments}.
* - {@link net.bytebuddy.implementation.bind.annotation.This}: A parameter
* of {@code Qux#baz} that is annotated with {@code This} will be assigned the instance that is instrumented for
* a non-static method.
* - {@link net.bytebuddy.implementation.bind.annotation.Super}: A parameter that is annotated with
* this annotation is assigned a proxy that allows calling an instrumented type's super methods.
* - {@link net.bytebuddy.implementation.bind.annotation.Default}: A parameter that is annotated with
* this annotation is assigned a proxy that allows calling an instrumented type's directly implemented interfaces'
* default methods.
* - {@link net.bytebuddy.implementation.bind.annotation.SuperCall}: A parameter
* of {@code Qux#baz} that is annotated with {@code SuperCall} will be assigned an instance of a type implementing both
* {@link java.lang.Runnable} and {@link java.util.concurrent.Callable} which will invoke the instrumented method on the
* invocation of either interface's method. The call is made using the original arguments of the method invocation.
* The return value is only emitted for the {@link java.util.concurrent.Callable#call()} method which additionally
* requires to catch any unchecked exceptions that might be thrown by the original method's implementation. If a
* source method is abstract, using this annotation excludes the method with this parameter annotation from being bound
* to this source method.
*
* - {@link net.bytebuddy.implementation.bind.annotation.SuperCall}:
* This annotation is similar to the {@link net.bytebuddy.implementation.bind.annotation.DefaultCall}
* annotation but it invokes a default method that is compatible to this method. If a source method does not represent
* a default method, using this annotation excludes the method with this parameter annotation from being bound to this
* source method. For using method handles, the {@link net.bytebuddy.implementation.bind.annotation.SuperCallHandle}
* and {@link net.bytebuddy.implementation.bind.annotation.DefaultCallHandle} annotations can be used.
* - The {@link net.bytebuddy.implementation.bind.annotation.SuperMethod} or
* {@link net.bytebuddy.implementation.bind.annotation.DefaultMethod} annotations can be used on any parameter type
* that is assignable from the {@link java.lang.reflect.Method} type. the parameter is bound a method instance that
* allows for the reflective invocation of a super or default method. Note that this method is not equal to the intercepted
* method but represents a synthetic accessor method. Using this annotation also causes this accessor to be {@code public}
* which allows its outside invocation without any access checks by a security manager. For using method handles, the
* {@link net.bytebuddy.implementation.bind.annotation.SuperCallHandle} and
* {@link net.bytebuddy.implementation.bind.annotation.DefaultCallHandle} annotations can be used.
* - {@link net.bytebuddy.implementation.bind.annotation.Origin}: A parameter of
* {@code Qux#baz} that is annotated with {@code Origin} is assigned a reference to either a {@link java.lang.reflect.Method},
* a {@link java.lang.reflect.Constructor}, a {@code java.lang.reflect.Executable} or a {@link java.lang.Class} instance.
* A {@code Method}-typed, {@code Constructor} or {@code Executable} parameter is assigned a reference to the original
* method that is instrumented. A {@code Class}-typed parameter is assigned the type of the caller. Furthermore, {@code MethodType}
* and {@code MethodHandle} parameters are also supported. When using the annotation on a {@link java.lang.String} type,
* the intercepted method's {@code toString} value is injected. The same holds for a parameter of type {@code int} that receives
* the modifiers of the instrumented method.
* - {@link net.bytebuddy.implementation.bind.annotation.StubValue}: Assigns the (boxed) default value of the
* intercepted method's return type to the parameter. If the return type is {@code void}, {@code null} is assigned.
* - {@link net.bytebuddy.implementation.bind.annotation.Empty}: Assigns the parameter type's
* default value, i.e. {@code null} for a reference type or zero for primitive types. This is an opportunity to
* ignore a parameter.
* - {@link net.bytebuddy.implementation.bind.annotation.Pipe}: A parameter that is annotated
* with this annotation is assigned a proxy for forwarding the source method invocation to another instance of the
* same type as the declaring type of the intercepted method. This annotation needs to be installed and explicitly
* registered before it can be used. See the {@link net.bytebuddy.implementation.bind.annotation.Pipe}
* annotation's documentation for further information on how this can be done.
* - {@link net.bytebuddy.implementation.bind.annotation.Morph}: The morph annotation is similar to
* the {@link net.bytebuddy.implementation.bind.annotation.SuperCall} annotation but allows to
* explicitly define and therewith alter the arguments that are handed to the super method. This annotation needs
* to be installed and explicitly registered before it can be used. See the documentation to the annotation for
* further information.
* - {@link net.bytebuddy.implementation.bind.annotation.FieldValue}: Allows to access a field's value at the time
* of the method invocation. The field's value is directly assigned to the annotated parameter.
* - {@link net.bytebuddy.implementation.bind.annotation.FieldProxy}: Allows to access fields via getter
* and setter proxies. This annotation needs to be installed and explicitly registered before it can be used.
* Note that any field access requires boxing such that a use of {@link net.bytebuddy.implementation.FieldAccessor} in
* combination with {@link net.bytebuddy.implementation.MethodDelegation#andThen(Implementation)} might be a more
* performant alternative for implementing field getters and setters.
*
* If a method is not annotated with any of the above methods, it will be treated as if it was annotated
* {@link net.bytebuddy.implementation.bind.annotation.Argument} using the next
* unbound parameter index of the source method as its parameter. This means that a method
* {@code Qux#baz(@Argument(2) Object p1, Object p2, @Argument(0) Object p3} would be treated as if {@code p2} was annotated
* with {@code @Argument(1)}.
*
* In addition, the {@link net.bytebuddy.implementation.bind.annotation.RuntimeType}
* annotation can instruct a parameter to be bound by a
* {@link net.bytebuddy.implementation.bytecode.assign.Assigner} with considering the
* runtime type of the parameter.
*
* Selecting among different methods that can be used for binding a method
* of the instrumented type
*
* When deciding between two methods {@code Foo#bar} and {@code Foo#qux} that could both be used to delegating a
* method call, the following consideration is applied in the given order:
*
* - {@link net.bytebuddy.implementation.bind.annotation.BindingPriority}:
* A method that is annotated with this annotation is given a specific priority where the default priority is set
* to {@link net.bytebuddy.implementation.bind.annotation.BindingPriority#DEFAULT}
* for non-annotated method. A method with a higher priority is considered a better target for delegation.
* - {@link net.bytebuddy.implementation.bind.DeclaringTypeResolver}:
* If a target method is declared by a more specific type than another method, the method with the most specific
* type is bound.
* - {@link net.bytebuddy.implementation.bind.MethodNameEqualityResolver}:
* If a source method {@code Baz#qux} is the source method, it will rather be assigned to {@code Foo#qux} because
* of their equal names. Similar names and case-insensitive equality are not considered.
* - {@link net.bytebuddy.implementation.bind.ArgumentTypeResolver}:
* The most specific type resolver will consider all bindings that are using the
* {@link net.bytebuddy.implementation.bind.annotation.Argument}
* annotation for resolving a binding conflict. In this context, the resolution will equal the most-specific
* type resolution that is performed by the Java compiler. This means that a source method {@code Bar#baz(String)}
* will rather be bound to a method {@code Foo#bar(String)} than {@code Foo#qux(Object)} because the {@code String}
* type is more specific than the {@code Object} type. If two methods are equally adequate by their parameter types,
* then the method with the higher numbers of {@code @Argument} annotated parameters is considered as the better
* delegation target.
* - {@link net.bytebuddy.implementation.bind.ParameterLengthResolver}:
* If a target methods has a higher number of total parameters that were successfully bound, the method with
* the higher number will be considered as the better delegation target.
*
*
* Additionally, if a method is annotated by
* {@link net.bytebuddy.implementation.bind.annotation.IgnoreForBinding},
* it is never considered as a target for a method delegation.
*
*
* Important: For invoking a method on another instance, use the {@link MethodCall} implementation. A method delegation
* intends to bind a interceptor class and its resolution algorithm will not necessarily yield a delegation to the intercepted
* method.
*
*
* @see MethodCall
* @see net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder.ParameterBinder.ForFixedValue
*/
@HashCodeAndEqualsPlugin.Enhance
public class MethodDelegation implements Implementation.Composable {
/**
* The implementation delegate for this method delegation.
*/
private final ImplementationDelegate implementationDelegate;
/**
* A list of {@link net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder.ParameterBinder}s
* to be used by this method delegation.
*/
private final List> parameterBinders;
/**
* The {@link net.bytebuddy.implementation.bind.MethodDelegationBinder.AmbiguityResolver}
* to be used by this method delegation.
*/
private final MethodDelegationBinder.AmbiguityResolver ambiguityResolver;
/**
* The termination handler to apply.
*/
private final TargetMethodAnnotationDrivenBinder.TerminationHandler terminationHandler;
/**
* The binding resolver being used to select the relevant method binding.
*/
private final MethodDelegationBinder.BindingResolver bindingResolver;
/**
* The {@link net.bytebuddy.implementation.bytecode.assign.Assigner} to be used by this method delegation.
*/
private final Assigner assigner;
/**
* Creates a new method delegation.
*
* @param implementationDelegate The implementation delegate to use by this method delegator.
* @param parameterBinders The parameter binders to use by this method delegator.
* @param ambiguityResolver The ambiguity resolver to use by this method delegator.
* @param bindingResolver The binding resolver being used to select the relevant method binding.
*/
protected MethodDelegation(ImplementationDelegate implementationDelegate,
List> parameterBinders,
MethodDelegationBinder.AmbiguityResolver ambiguityResolver,
MethodDelegationBinder.BindingResolver bindingResolver) {
this(implementationDelegate,
parameterBinders,
ambiguityResolver,
MethodDelegationBinder.TerminationHandler.Default.RETURNING,
bindingResolver,
Assigner.DEFAULT);
}
/**
* Creates a new method delegation.
*
* @param implementationDelegate The implementation delegate to use by this method delegator.
* @param parameterBinders The parameter binders to use by this method delegator.
* @param ambiguityResolver The ambiguity resolver to use by this method delegator.
* @param terminationHandler The termination handler to apply.
* @param bindingResolver The binding resolver being used to select the relevant method binding.
* @param assigner The assigner to be supplied by this method delegator.
*/
private MethodDelegation(ImplementationDelegate implementationDelegate,
List> parameterBinders,
MethodDelegationBinder.AmbiguityResolver ambiguityResolver,
TargetMethodAnnotationDrivenBinder.TerminationHandler terminationHandler,
MethodDelegationBinder.BindingResolver bindingResolver,
Assigner assigner) {
this.implementationDelegate = implementationDelegate;
this.parameterBinders = parameterBinders;
this.terminationHandler = terminationHandler;
this.ambiguityResolver = ambiguityResolver;
this.bindingResolver = bindingResolver;
this.assigner = assigner;
}
/**
* Delegates any intercepted method to invoke a {@code static} method that is declared by the supplied type. To be considered
* a valid delegation target, the target method must be visible and accessible to the instrumented type. This is the case if
* the target type is either public or in the same package as the instrumented type and if the target method is either public
* or non-private and in the same package as the instrumented type. Private methods can only be used as a delegation target if
* the interception is targeting the instrumented type.
*
* @param type The target type for the delegation.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Class type) {
return withDefaultConfiguration().to(type);
}
/**
* Delegates any intercepted method to invoke a {@code static} method that is declared by the supplied type. To be considered
* a valid delegation target, the target method must be visible and accessible to the instrumented type. This is the case if
* the target type is either public or in the same package as the instrumented type and if the target method is either public
* or non-private and in the same package as the instrumented type. Private methods can only be used as a delegation target if
* the interception is targeting the instrumented type.
*
* @param typeDescription The target type for the delegation.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(TypeDescription typeDescription) {
return withDefaultConfiguration().to(typeDescription);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target) {
return withDefaultConfiguration().to(target);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().to(target, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, String fieldName) {
return withDefaultConfiguration().to(target, fieldName);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, String fieldName, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().to(target, fieldName, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param type The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, Type type) {
return withDefaultConfiguration().to(target, type);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param type The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, Type type, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().to(target, type, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param type The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, Type type, String fieldName) {
return withDefaultConfiguration().to(target, type, fieldName);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param type The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, Type type, String fieldName, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().to(target, type, fieldName, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param typeDefinition The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, TypeDefinition typeDefinition) {
return withDefaultConfiguration().to(target, typeDefinition);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param typeDefinition The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, TypeDefinition typeDefinition, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().to(target, typeDefinition, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param typeDefinition The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, TypeDefinition typeDefinition, String fieldName) {
return withDefaultConfiguration().to(target, typeDefinition, fieldName);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param typeDefinition The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public static MethodDelegation to(Object target, TypeDefinition typeDefinition, String fieldName, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().to(target, typeDefinition, fieldName, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a constructor of the supplied type. To be considered a valid delegation target,
* a constructor must be visible and accessible to the instrumented type. This is the case if the constructor's declaring type is
* either public or in the same package as the instrumented type and if the constructor is either public or non-private and in
* the same package as the instrumented type. Private constructors can only be used as a delegation target if the delegation is
* targeting the instrumented type.
*
* @param type The type to construct.
* @return A delegation that redirects method calls to a constructor of the supplied type.
*/
public static MethodDelegation toConstructor(Class type) {
return withDefaultConfiguration().toConstructor(type);
}
/**
* Delegates any intercepted method to invoke a constructor of the supplied type. To be considered a valid delegation target,
* a constructor must be visible and accessible to the instrumented type. This is the case if the constructor's declaring type is
* either public or in the same package as the instrumented type and if the constructor is either public or non-private and in
* the same package as the instrumented type. Private constructors can only be used as a delegation target if the delegation is
* targeting the instrumented type.
*
* @param typeDescription The type to construct.
* @return A delegation that redirects method calls to a constructor of the supplied type.
*/
public static MethodDelegation toConstructor(TypeDescription typeDescription) {
return withDefaultConfiguration().toConstructor(typeDescription);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method on the instance of the supplied field. To be
* considered a valid delegation target, a method must be visible and accessible to the instrumented type. This is the
* case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param name The field's name.
* @return A delegation that redirects invocations to a method of the specified field's instance.
*/
public static MethodDelegation toField(String name) {
return withDefaultConfiguration().toField(name);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method on the instance of the supplied field. To be
* considered a valid delegation target, a method must be visible and accessible to the instrumented type. This is the
* case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param name The field's name.
* @param fieldLocatorFactory The field locator factory to use.
* @return A delegation that redirects invocations to a method of the specified field's instance.
*/
public static MethodDelegation toField(String name, FieldLocator.Factory fieldLocatorFactory) {
return withDefaultConfiguration().toField(name, fieldLocatorFactory);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method on the instance of the supplied field. To be
* considered a valid delegation target, a method must be visible and accessible to the instrumented type. This is the
* case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param name The field's name.
* @param methodGraphCompiler The method graph compiler to use.
* @return A delegation that redirects invocations to a method of the specified field's instance.
*/
public static MethodDelegation toField(String name, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().toField(name, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method on the instance of the supplied field. To be
* considered a valid delegation target, a method must be visible and accessible to the instrumented type. This is the
* case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param name The field's name.
* @param fieldLocatorFactory The field locator factory to use.
* @param methodGraphCompiler The method graph compiler to use.
* @return A delegation that redirects invocations to a method of the specified field's instance.
*/
public static MethodDelegation toField(String name, FieldLocator.Factory fieldLocatorFactory, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().toField(name, fieldLocatorFactory, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a method on an instance that is returned by a parameterless method of the
* given name. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if
* the method is either public or non-private and in the same package as the instrumented type. Private methods can only
* be used as a delegation target if the delegation is targeting the instrumented type.
*
* @param name The name of the method that returns the delegation target.
* @return A delegation that redirects invocations to the return value of a method that is declared by the instrumented type.
*/
public static MethodDelegation toMethodReturnOf(String name) {
return withDefaultConfiguration().toMethodReturnOf(name);
}
/**
* Delegates any intercepted method to invoke a method on an instance that is returned by a parameterless method of the
* given name. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if
* the method is either public or non-private and in the same package as the instrumented type. Private methods can only
* be used as a delegation target if the delegation is targeting the instrumented type.
*
* @param name The name of the method that returns the delegation target.
* @param methodGraphCompiler The method graph compiler to use.
* @return A delegation that redirects invocations to the return value of a method that is declared by the instrumented type.
*/
public static MethodDelegation toMethodReturnOf(String name, MethodGraph.Compiler methodGraphCompiler) {
return withDefaultConfiguration().toMethodReturnOf(name, methodGraphCompiler);
}
/**
* Creates a configuration builder for a method delegation that is pre-configured with the ambiguity resolvers defined by
* {@link net.bytebuddy.implementation.bind.MethodDelegationBinder.AmbiguityResolver#DEFAULT} and the parameter binders
* defined by {@link net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder.ParameterBinder#DEFAULTS}.
*
* @return A method delegation configuration with pre-configuration.
*/
public static WithCustomProperties withDefaultConfiguration() {
return new WithCustomProperties(MethodDelegationBinder.AmbiguityResolver.DEFAULT, TargetMethodAnnotationDrivenBinder.ParameterBinder.DEFAULTS);
}
/**
* Creates a configuration builder for a method delegation that does not apply any pre-configured
* {@link net.bytebuddy.implementation.bind.MethodDelegationBinder.AmbiguityResolver}s or
* {@link net.bytebuddy.implementation.bind.annotation.TargetMethodAnnotationDrivenBinder.ParameterBinder}s.
*
* @return A method delegation configuration without any pre-configuration.
*/
public static WithCustomProperties withEmptyConfiguration() {
return new WithCustomProperties(MethodDelegationBinder.AmbiguityResolver.NoOp.INSTANCE, Collections.>emptyList());
}
/**
* Applies an assigner to the method delegation that is used for assigning method return and parameter types.
*
* @param assigner The assigner to apply.
* @return A method delegation implementation that makes use of the given designer.
*/
public Implementation.Composable withAssigner(Assigner assigner) {
return new MethodDelegation(implementationDelegate,
parameterBinders,
ambiguityResolver,
terminationHandler,
bindingResolver,
assigner);
}
/**
* {@inheritDoc}
*/
public Implementation andThen(Implementation implementation) {
return new Compound(new MethodDelegation(implementationDelegate,
parameterBinders,
ambiguityResolver,
MethodDelegationBinder.TerminationHandler.Default.DROPPING,
bindingResolver,
assigner), implementation);
}
/**
* {@inheritDoc}
*/
public Composable andThen(Composable implementation) {
return new Compound.Composable(new MethodDelegation(implementationDelegate,
parameterBinders,
ambiguityResolver,
MethodDelegationBinder.TerminationHandler.Default.DROPPING,
bindingResolver,
assigner), implementation);
}
/**
* {@inheritDoc}
*/
public InstrumentedType prepare(InstrumentedType instrumentedType) {
return implementationDelegate.prepare(instrumentedType);
}
/**
* {@inheritDoc}
*/
public ByteCodeAppender appender(Target implementationTarget) {
ImplementationDelegate.Compiled compiled = implementationDelegate.compile(implementationTarget.getInstrumentedType());
return new Appender(implementationTarget,
new MethodDelegationBinder.Processor(compiled.getRecords(), ambiguityResolver, bindingResolver),
terminationHandler,
assigner,
compiled);
}
/**
* An implementation delegate is responsible for executing the actual method delegation and for resolving the target methods.
*/
protected interface ImplementationDelegate extends InstrumentedType.Prepareable {
/**
* A name prefix for fields.
*/
String FIELD_NAME_PREFIX = "delegate";
/**
* Compiles this implementation delegate.
*
* @param instrumentedType The instrumented type.
* @return A compiled implementation delegate.
*/
Compiled compile(TypeDescription instrumentedType);
/**
* A compiled implementation delegate.
*/
interface Compiled {
/**
* Resolves a stack manipulation that prepares the delegation invocation.
*
* @param instrumentedMethod The instrumented method.
* @return A stack manipulation that is applied prior to loading arguments and executing the method call.
*/
StackManipulation prepare(MethodDescription instrumentedMethod);
/**
* Resolves an invoker to use for invoking the delegation target.
*
* @return The method invoker to use.
*/
MethodDelegationBinder.MethodInvoker invoke();
/**
* Returns a list of binding records to consider for delegation.
*
* @return A list of delegation binder records to consider.
*/
List getRecords();
/**
* A compiled implementation delegate for invoking a static method.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForStaticCall implements Compiled {
/**
* The list of records to consider.
*/
private final List records;
/**
* Creates a new compiled implementation delegate for a static method call.
*
* @param records The list of records to consider.
*/
protected ForStaticCall(List records) {
this.records = records;
}
/**
* {@inheritDoc}
*/
public StackManipulation prepare(MethodDescription instrumentedMethod) {
return StackManipulation.Trivial.INSTANCE;
}
/**
* {@inheritDoc}
*/
public MethodDelegationBinder.MethodInvoker invoke() {
return MethodDelegationBinder.MethodInvoker.Simple.INSTANCE;
}
/**
* {@inheritDoc}
*/
public List getRecords() {
return records;
}
}
/**
* A compiled implementation delegate that invokes methods on a field.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForField implements Compiled {
/**
* The field to delegate to.
*/
private final FieldDescription fieldDescription;
/**
* The records to consider for delegation.
*/
private final List records;
/**
* Creates a new compiled implementation delegate for a field delegation.
*
* @param fieldDescription The field to delegate to.
* @param records The records to consider for delegation.
*/
protected ForField(FieldDescription fieldDescription, List records) {
this.fieldDescription = fieldDescription;
this.records = records;
}
/**
* {@inheritDoc}
*/
public StackManipulation prepare(MethodDescription instrumentedMethod) {
if (instrumentedMethod.isStatic() && !fieldDescription.isStatic()) {
throw new IllegalStateException("Cannot read " + fieldDescription + " from " + instrumentedMethod);
}
return new StackManipulation.Compound(fieldDescription.isStatic()
? StackManipulation.Trivial.INSTANCE
: MethodVariableAccess.loadThis(), FieldAccess.forField(fieldDescription).read());
}
/**
* {@inheritDoc}
*/
public MethodDelegationBinder.MethodInvoker invoke() {
return new MethodDelegationBinder.MethodInvoker.Virtual(fieldDescription.getType().asErasure());
}
/**
* {@inheritDoc}
*/
public List getRecords() {
return records;
}
}
/**
* A compiled implementation delegate that invokes a method on an instance that is returned by another method.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForMethodReturn implements Compiled {
/**
* The method to call for result.
*/
private final MethodDescription methodDescription;
/**
* The records to consider for delegation.
*/
private final List records;
/**
* Creates a new compiled implementation delegate for a field delegation.
*
* @param methodDescription The method to call for result.
* @param records The records to consider for delegation.
*/
protected ForMethodReturn(MethodDescription methodDescription, List records) {
this.methodDescription = methodDescription;
this.records = records;
}
/**
* {@inheritDoc}
*/
public StackManipulation prepare(MethodDescription instrumentedMethod) {
if (instrumentedMethod.isStatic() && !methodDescription.isStatic()) {
throw new IllegalStateException("Cannot invoke " + methodDescription + " from " + instrumentedMethod);
}
return new StackManipulation.Compound(methodDescription.isStatic()
? StackManipulation.Trivial.INSTANCE
: MethodVariableAccess.loadThis(), MethodInvocation.invoke(methodDescription));
}
/**
* {@inheritDoc}
*/
public MethodDelegationBinder.MethodInvoker invoke() {
return new MethodDelegationBinder.MethodInvoker.Virtual(methodDescription.getReturnType().asErasure());
}
/**
* {@inheritDoc}
*/
public List getRecords() {
return records;
}
}
/**
* A compiled implementation delegate for a constructor delegation.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForConstruction implements Compiled {
/**
* The type to be constructed.
*/
private final TypeDescription typeDescription;
/**
* The records to consider for delegation.
*/
private final List records;
/**
* Creates a new compiled implementation delegate for a constructor delegation.
*
* @param typeDescription The type to be constructed.
* @param records The records to consider for delegation.
*/
protected ForConstruction(TypeDescription typeDescription, List records) {
this.typeDescription = typeDescription;
this.records = records;
}
/**
* {@inheritDoc}
*/
public StackManipulation prepare(MethodDescription instrumentedMethod) {
return new StackManipulation.Compound(TypeCreation.of(typeDescription), Duplication.SINGLE);
}
/**
* {@inheritDoc}
*/
public MethodDelegationBinder.MethodInvoker invoke() {
return MethodDelegationBinder.MethodInvoker.Simple.INSTANCE;
}
/**
* {@inheritDoc}
*/
public List getRecords() {
return records;
}
}
}
/**
* An implementation delegate for a static method delegation.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForStaticMethod implements ImplementationDelegate {
/**
* The precompiled records.
*/
private final List records;
/**
* Creates a new implementation delegate for a static method delegation.
*
* @param records The precompiled record.
*/
protected ForStaticMethod(List records) {
this.records = records;
}
/**
* Precompiles a static method delegation for a given list of methods.
*
* @param methods The methods to consider.
* @param methodDelegationBinder The method delegation binder to use.
* @return An appropriate implementation delegate.
*/
protected static ImplementationDelegate of(MethodList methods, MethodDelegationBinder methodDelegationBinder) {
List records = new ArrayList(methods.size());
for (MethodDescription methodDescription : methods) {
records.add(methodDelegationBinder.compile(methodDescription));
}
return new ForStaticMethod(records);
}
/**
* {@inheritDoc}
*/
public InstrumentedType prepare(InstrumentedType instrumentedType) {
return instrumentedType;
}
/**
* {@inheritDoc}
*/
public ImplementationDelegate.Compiled compile(TypeDescription instrumentedType) {
return new Compiled.ForStaticCall(records);
}
}
/**
* An implementation delegate for invoking methods on a field that is declared by the instrumented type or a super type.
*/
@HashCodeAndEqualsPlugin.Enhance
abstract class ForField implements ImplementationDelegate {
/**
* The name of the field that is target of the delegation.
*/
protected final String fieldName;
/**
* The method graph compiler to use.
*/
protected final MethodGraph.Compiler methodGraphCompiler;
/**
* The parameter binders to use.
*/
protected final List> parameterBinders;
/**
* The matcher to use for filtering methods.
*/
protected final ElementMatcher matcher;
/**
* Creates a new implementation delegate for a field delegation.
*
* @param fieldName The name of the field that is target of the delegation.
* @param methodGraphCompiler The method graph compiler to use.
* @param parameterBinders The parameter binders to use.
* @param matcher The matcher to use for filtering methods.
*/
protected ForField(String fieldName,
MethodGraph.Compiler methodGraphCompiler,
List> parameterBinders,
ElementMatcher matcher) {
this.fieldName = fieldName;
this.methodGraphCompiler = methodGraphCompiler;
this.parameterBinders = parameterBinders;
this.matcher = matcher;
}
/**
* {@inheritDoc}
*/
public Compiled compile(TypeDescription instrumentedType) {
FieldDescription fieldDescription = resolve(instrumentedType);
if (!fieldDescription.getType().asErasure().isVisibleTo(instrumentedType)) {
throw new IllegalStateException(fieldDescription + " is not visible to " + instrumentedType);
} else {
MethodList candidates = methodGraphCompiler.compile(fieldDescription.getType(), instrumentedType)
.listNodes()
.asMethodList()
.filter(matcher);
List records = new ArrayList(candidates.size());
MethodDelegationBinder methodDelegationBinder = TargetMethodAnnotationDrivenBinder.of(parameterBinders);
for (MethodDescription candidate : candidates) {
records.add(methodDelegationBinder.compile(candidate));
}
return new Compiled.ForField(fieldDescription, records);
}
}
/**
* Resolves the field to which is delegated.
*
* @param instrumentedType The instrumented type.
* @return The field that is the delegation target.
*/
protected abstract FieldDescription resolve(TypeDescription instrumentedType);
/**
* An implementation target for a static field that is declared by the instrumented type and that is assigned an instance.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class WithInstance extends ForField {
/**
* The target instance.
*/
private final Object target;
/**
* The field's type.
*/
private final TypeDescription.Generic fieldType;
/**
* Creates a new implementation delegate for invoking methods on a supplied instance.
*
* @param fieldName The name of the field that is target of the delegation.
* @param methodGraphCompiler The method graph compiler to use.
* @param parameterBinders The parameter binders to use.
* @param matcher The matcher to use for filtering methods.
* @param target The target instance.
* @param fieldType The field's type.
*/
protected WithInstance(String fieldName,
MethodGraph.Compiler methodGraphCompiler,
List> parameterBinders,
ElementMatcher matcher,
Object target,
TypeDescription.Generic fieldType) {
super(fieldName, methodGraphCompiler, parameterBinders, matcher);
this.target = target;
this.fieldType = fieldType;
}
/**
* {@inheritDoc}
*/
public InstrumentedType prepare(InstrumentedType instrumentedType) {
return instrumentedType.withAuxiliaryField(new FieldDescription.Token(fieldName,
Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC | Opcodes.ACC_VOLATILE | Opcodes.ACC_SYNTHETIC,
fieldType), target);
}
@Override
protected FieldDescription resolve(TypeDescription instrumentedType) {
if (!fieldType.asErasure().isVisibleTo(instrumentedType)) {
throw new IllegalStateException(fieldType + " is not visible to " + instrumentedType);
} else {
return instrumentedType.getDeclaredFields()
.filter(named(fieldName).and(fieldType(fieldType.asErasure())))
.getOnly();
}
}
}
/**
* An implementation target for a field that is declared by the instrumented type or a super type.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class WithLookup extends ForField {
/**
* The field locator factory to use for locating the field to delegate to.
*/
private final FieldLocator.Factory fieldLocatorFactory;
/**
* Creates a new implementation delegate for a field that is declared by the instrumented type or any super type.
*
* @param fieldName The name of the field that is target of the delegation.
* @param methodGraphCompiler The method graph compiler to use.
* @param parameterBinders The parameter binders to use.
* @param matcher The matcher to use for filtering methods.
* @param fieldLocatorFactory The field locator factory to use for locating the field to delegate to.
*/
protected WithLookup(String fieldName,
MethodGraph.Compiler methodGraphCompiler,
List> parameterBinders,
ElementMatcher matcher,
FieldLocator.Factory fieldLocatorFactory) {
super(fieldName, methodGraphCompiler, parameterBinders, matcher);
this.fieldLocatorFactory = fieldLocatorFactory;
}
/**
* {@inheritDoc}
*/
public InstrumentedType prepare(InstrumentedType instrumentedType) {
return instrumentedType;
}
@Override
protected FieldDescription resolve(TypeDescription instrumentedType) {
FieldLocator.Resolution resolution = fieldLocatorFactory.make(instrumentedType).locate(fieldName);
if (!resolution.isResolved()) {
throw new IllegalStateException("Could not locate " + fieldName + " on " + instrumentedType);
} else {
return resolution.getField();
}
}
}
}
/**
* An implementation delegate for invoking a delegation target on the another methods return value.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForMethodReturn implements ImplementationDelegate {
/**
* The name of the method to invoke.
*/
private final String name;
/**
* The method graph compiler to use.
*/
private final MethodGraph.Compiler methodGraphCompiler;
/**
* The parameter binders to use.
*/
private final List> parameterBinders;
/**
* The matcher to use for filtering methods.
*/
private final ElementMatcher matcher;
/**
* Creates a new implementation delegate for a method return value delegation.
*
* @param name The name of the method to invoke.
* @param methodGraphCompiler The method graph compiler to use.
* @param parameterBinders The parameter binders to use.
* @param matcher The matcher to use for filtering methods.
*/
protected ForMethodReturn(String name,
MethodGraph.Compiler methodGraphCompiler,
List> parameterBinders,
ElementMatcher matcher) {
this.name = name;
this.methodGraphCompiler = methodGraphCompiler;
this.parameterBinders = parameterBinders;
this.matcher = matcher;
}
/**
* {@inheritDoc}
*/
public Compiled compile(TypeDescription instrumentedType) {
MethodList targets = new MethodList.Explicit(CompoundList.of(
instrumentedType.getDeclaredMethods().filter(isStatic().or(isPrivate())),
methodGraphCompiler.compile((TypeDefinition) instrumentedType).listNodes().asMethodList())
).filter(named(name).and(takesArguments(0)).and(not(returns(isPrimitive().or(isArray())))));
if (targets.size() != 1) {
throw new IllegalStateException(instrumentedType + " does not define method without arguments with name " + name + ": " + targets);
} else if (!targets.getOnly().getReturnType().asErasure().isVisibleTo(instrumentedType)) {
throw new IllegalStateException(targets.getOnly() + " is not visible to " + instrumentedType);
} else {
MethodList candidates = methodGraphCompiler.compile(targets.getOnly().getReturnType(), instrumentedType)
.listNodes()
.asMethodList()
.filter(matcher);
List records = new ArrayList(candidates.size());
MethodDelegationBinder methodDelegationBinder = TargetMethodAnnotationDrivenBinder.of(parameterBinders);
for (MethodDescription candidate : candidates) {
records.add(methodDelegationBinder.compile(candidate));
}
return new Compiled.ForMethodReturn(targets.get(0), records);
}
}
/**
* {@inheritDoc}
*/
public InstrumentedType prepare(InstrumentedType instrumentedType) {
return instrumentedType;
}
}
/**
* An implementation delegate for constructing an instance.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForConstruction implements ImplementationDelegate {
/**
* The type being constructed.
*/
private final TypeDescription typeDescription;
/**
* The precompiled delegation records.
*/
private final List records;
/**
* Creates an implementation delegate for constructing a new instance.
*
* @param typeDescription The type being constructed.
* @param records The precompiled delegation records.
*/
protected ForConstruction(TypeDescription typeDescription, List records) {
this.typeDescription = typeDescription;
this.records = records;
}
/**
* Creates an implementation delegate for constructing a new instance.
*
* @param typeDescription The type being constructed.
* @param methods The constructors to consider.
* @param methodDelegationBinder The method delegation binder to use.
* @return An appropriate implementation delegate.
*/
protected static ImplementationDelegate of(TypeDescription typeDescription,
MethodList methods,
MethodDelegationBinder methodDelegationBinder) {
List records = new ArrayList(methods.size());
for (MethodDescription methodDescription : methods) {
records.add(methodDelegationBinder.compile(methodDescription));
}
return new ForConstruction(typeDescription, records);
}
/**
* {@inheritDoc}
*/
public InstrumentedType prepare(InstrumentedType instrumentedType) {
return instrumentedType;
}
/**
* {@inheritDoc}
*/
public Compiled compile(TypeDescription instrumentedType) {
return new Compiled.ForConstruction(typeDescription, records);
}
}
}
/**
* The appender for implementing a {@link net.bytebuddy.implementation.MethodDelegation}.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class Appender implements ByteCodeAppender {
/**
* The implementation target of this implementation.
*/
private final Target implementationTarget;
/**
* The method delegation binder processor which is responsible for implementing the method delegation.
*/
private final MethodDelegationBinder.Record processor;
/**
* A termination handler for a method delegation binder.
*/
private final MethodDelegationBinder.TerminationHandler terminationHandler;
/**
* The assigner to use.
*/
private final Assigner assigner;
/**
* The compiled implementation delegate.
*/
private final ImplementationDelegate.Compiled compiled;
/**
* Creates a new appender for a method delegation.
*
* @param implementationTarget The implementation target of this implementation.
* @param processor The method delegation binder processor which is responsible for implementing the method delegation.
* @param terminationHandler A termination handler for a method delegation binder.
* @param assigner The assigner to use.
* @param compiled The compiled implementation delegate.
*/
protected Appender(Target implementationTarget,
MethodDelegationBinder.Record processor,
MethodDelegationBinder.TerminationHandler terminationHandler,
Assigner assigner,
ImplementationDelegate.Compiled compiled) {
this.implementationTarget = implementationTarget;
this.processor = processor;
this.terminationHandler = terminationHandler;
this.assigner = assigner;
this.compiled = compiled;
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Context implementationContext, MethodDescription instrumentedMethod) {
StackManipulation.Size stackSize = new StackManipulation.Compound(
compiled.prepare(instrumentedMethod),
processor.bind(implementationTarget, instrumentedMethod, terminationHandler, compiled.invoke(), assigner)
).apply(methodVisitor, implementationContext);
return new Size(stackSize.getMaximalSize(), instrumentedMethod.getStackSize());
}
}
/**
* A {@link MethodDelegation} with custom configuration.
*/
@HashCodeAndEqualsPlugin.Enhance
public static class WithCustomProperties {
/**
* The ambiguity resolver to use.
*/
private final MethodDelegationBinder.AmbiguityResolver ambiguityResolver;
/**
* The parameter binders to use.
*/
private final List> parameterBinders;
/**
* The binding resolver being used to select the relevant method binding.
*/
private final MethodDelegationBinder.BindingResolver bindingResolver;
/**
* The matcher to use for filtering relevant methods.
*/
private final ElementMatcher matcher;
/**
* Creates a new method delegation with custom properties that does not filter any methods.
*
* @param ambiguityResolver The ambiguity resolver to use.
* @param parameterBinders The parameter binders to use.
*/
protected WithCustomProperties(MethodDelegationBinder.AmbiguityResolver ambiguityResolver,
List> parameterBinders) {
this(ambiguityResolver, parameterBinders, MethodDelegationBinder.BindingResolver.Default.INSTANCE, any());
}
/**
* Creates a new method delegation with custom properties.
*
* @param ambiguityResolver The ambiguity resolver to use.
* @param parameterBinders The parameter binders to use.
* @param bindingResolver The binding resolver being used to select the relevant method binding.
* @param matcher The matcher to use for filtering relevant methods.
*/
private WithCustomProperties(MethodDelegationBinder.AmbiguityResolver ambiguityResolver,
List> parameterBinders,
MethodDelegationBinder.BindingResolver bindingResolver,
ElementMatcher matcher) {
this.ambiguityResolver = ambiguityResolver;
this.parameterBinders = parameterBinders;
this.bindingResolver = bindingResolver;
this.matcher = matcher;
}
/**
* Configures this method delegation to use the supplied ambiguity resolvers when deciding which out of two ore
* more legal delegation targets should be considered.
*
* @param ambiguityResolver The ambiguity resolvers to use in their application order.
* @return A new delegation configuration which also applies the supplied ambiguity resolvers.
*/
public WithCustomProperties withResolvers(MethodDelegationBinder.AmbiguityResolver... ambiguityResolver) {
return withResolvers(Arrays.asList(ambiguityResolver));
}
/**
* Configures this method delegation to use the supplied ambiguity resolvers when deciding which out of two ore
* more legal delegation targets should be considered.
*
* @param ambiguityResolvers The ambiguity resolvers to use in their application order.
* @return A new delegation configuration which also applies the supplied ambiguity resolvers.
*/
public WithCustomProperties withResolvers(List ambiguityResolvers) {
return new WithCustomProperties(new MethodDelegationBinder.AmbiguityResolver.Compound(CompoundList.of(this.ambiguityResolver,
ambiguityResolvers)), parameterBinders, bindingResolver, matcher);
}
/**
* Configures this method delegation to use the supplied parameter binders when deciding what value to assign to
* a parameter of a delegation target.
*
* @param parameterBinder The parameter binders to use.
* @return A new delegation configuration which also applies the supplied parameter binders.
*/
public WithCustomProperties withBinders(TargetMethodAnnotationDrivenBinder.ParameterBinder... parameterBinder) {
return withBinders(Arrays.asList(parameterBinder));
}
/**
* Configures this method delegation to use the supplied parameter binders when deciding what value to assign to
* a parameter of a delegation target.
*
* @param parameterBinders The parameter binders to use.
* @return A new delegation configuration which also applies the supplied parameter binders.
*/
public WithCustomProperties withBinders(List> parameterBinders) {
return new WithCustomProperties(ambiguityResolver, CompoundList.of(this.parameterBinders, parameterBinders), bindingResolver, matcher);
}
/**
* Configures a custom binding resolver which is responsible for choosing a method binding among multiple candidates. Configuring
* a resolver overrides any previous configuration.
*
* @param bindingResolver The binding resolver being used to select the relevant method binding.
* @return A new delegation configuration which applies the supplied binding resolver.
*/
public WithCustomProperties withBindingResolver(MethodDelegationBinder.BindingResolver bindingResolver) {
return new WithCustomProperties(ambiguityResolver, parameterBinders, bindingResolver, matcher);
}
/**
* Configures this method delegation to only consider methods or constructors as a delegation target if they match the supplied matcher.
*
* @param matcher The matcher any delegation target needs to match in order to be considered a for delegation.
* @return A new delegation configuration which only considers methods for delegation if they match the supplied matcher.
*/
@SuppressWarnings("unchecked")
public WithCustomProperties filter(ElementMatcher matcher) {
return new WithCustomProperties(ambiguityResolver,
parameterBinders,
bindingResolver,
new ElementMatcher.Junction.Conjunction(this.matcher, matcher));
}
/**
* Delegates any intercepted method to invoke a {@code static} method that is declared by the supplied type. To be considered
* a valid delegation target, the target method must be visible and accessible to the instrumented type. This is the case if
* the target type is either public or in the same package as the instrumented type and if the target method is either public
* or non-private and in the same package as the instrumented type. Private methods can only be used as a delegation target if
* the interception is targeting the instrumented type.
*
* @param type The target type for the delegation.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Class type) {
return to(TypeDescription.ForLoadedType.of(type));
}
/**
* Delegates any intercepted method to invoke a {@code static} method that is declared by the supplied type. To be considered
* a valid delegation target, the target method must be visible and accessible to the instrumented type. This is the case if
* the target type is either public or in the same package as the instrumented type and if the target method is either public
* or non-private and in the same package as the instrumented type. Private methods can only be used as a delegation target if
* the delegation is targeting the instrumented type.
*
* @param typeDescription The target type for the delegation.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(TypeDescription typeDescription) {
if (typeDescription.isArray()) {
throw new IllegalArgumentException("Cannot delegate to array " + typeDescription);
} else if (typeDescription.isPrimitive()) {
throw new IllegalArgumentException("Cannot delegate to primitive " + typeDescription);
}
return new MethodDelegation(ImplementationDelegate.ForStaticMethod.of(typeDescription.getDeclaredMethods().filter(isStatic().and(matcher)),
TargetMethodAnnotationDrivenBinder.of(parameterBinders)), parameterBinders, ambiguityResolver, bindingResolver);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target) {
return to(target, MethodGraph.Compiler.DEFAULT);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, MethodGraph.Compiler methodGraphCompiler) {
return to(target, target.getClass(), methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, String fieldName) {
return to(target, fieldName, MethodGraph.Compiler.DEFAULT);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, String fieldName, MethodGraph.Compiler methodGraphCompiler) {
return to(target, target.getClass(), fieldName, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param type The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, Type type) {
return to(target, type, MethodGraph.Compiler.DEFAULT);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param type The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, Type type, MethodGraph.Compiler methodGraphCompiler) {
return to(target,
type,
ImplementationDelegate.FIELD_NAME_PREFIX + "$" + RandomString.hashOf(target),
methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param type The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, Type type, String fieldName) {
return to(target, type, fieldName, MethodGraph.Compiler.DEFAULT);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param type The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, Type type, String fieldName, MethodGraph.Compiler methodGraphCompiler) {
return to(target, TypeDefinition.Sort.describe(type), fieldName, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param typeDefinition The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, TypeDefinition typeDefinition) {
return to(target, typeDefinition, MethodGraph.Compiler.DEFAULT);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param typeDefinition The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, TypeDefinition typeDefinition, MethodGraph.Compiler methodGraphCompiler) {
return to(target,
typeDefinition,
ImplementationDelegate.FIELD_NAME_PREFIX + "$" + RandomString.hashOf(target),
methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param typeDefinition The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, TypeDefinition typeDefinition, String fieldName) {
return to(target, typeDefinition, fieldName, MethodGraph.Compiler.DEFAULT);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method that is declared by the supplied type's instance or any
* of its super types. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param target The target instance for the delegation.
* @param typeDefinition The most specific type of which {@code target} should be considered. Must be a super type of the target's actual type.
* @param fieldName The name of the field that is holding the {@code target} instance.
* @param methodGraphCompiler The method graph compiler to use.
* @return A method delegation that redirects method calls to a static method of the supplied type.
*/
public MethodDelegation to(Object target, TypeDefinition typeDefinition, String fieldName, MethodGraph.Compiler methodGraphCompiler) {
if (!typeDefinition.asErasure().isInstance(target)) {
throw new IllegalArgumentException(target + " is not an instance of " + typeDefinition);
}
return new MethodDelegation(new ImplementationDelegate.ForField.WithInstance(fieldName,
methodGraphCompiler,
parameterBinders,
matcher,
target,
typeDefinition.asGenericType()), parameterBinders, ambiguityResolver, bindingResolver);
}
/**
* Delegates any intercepted method to invoke a constructor of the supplied type. To be considered a valid delegation target,
* a constructor must be visible and accessible to the instrumented type. This is the case if the constructor's declaring type is
* either public or in the same package as the instrumented type and if the constructor is either public or non-private and in
* the same package as the instrumented type. Private constructors can only be used as a delegation target if the delegation is
* targeting the instrumented type.
*
* @param type The type to construct.
* @return A delegation that redirects method calls to a constructor of the supplied type.
*/
public MethodDelegation toConstructor(Class type) {
return toConstructor(TypeDescription.ForLoadedType.of(type));
}
/**
* Delegates any intercepted method to invoke a constructor of the supplied type. To be considered a valid delegation target,
* a constructor must be visible and accessible to the instrumented type. This is the case if the constructor's declaring type is
* either public or in the same package as the instrumented type and if the constructor is either public or non-private and in
* the same package as the instrumented type. Private constructors can only be used as a delegation target if the delegation is
* targeting the instrumented type.
*
* @param typeDescription The type to construct.
* @return A delegation that redirects method calls to a constructor of the supplied type.
*/
public MethodDelegation toConstructor(TypeDescription typeDescription) {
return new MethodDelegation(ImplementationDelegate.ForConstruction.of(typeDescription,
typeDescription.getDeclaredMethods().filter(isConstructor().and(matcher)),
TargetMethodAnnotationDrivenBinder.of(parameterBinders)), parameterBinders, ambiguityResolver, bindingResolver);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method on the instance of the supplied field. To be
* considered a valid delegation target, a method must be visible and accessible to the instrumented type. This is the
* case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param name The field's name.
* @return A delegation that redirects invocations to a method of the specified field's instance.
*/
public MethodDelegation toField(String name) {
return toField(name, FieldLocator.ForClassHierarchy.Factory.INSTANCE);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method on the instance of the supplied field. To be
* considered a valid delegation target, a method must be visible and accessible to the instrumented type. This is the
* case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param name The field's name.
* @param fieldLocatorFactory The field locator factory to use.
* @return A delegation that redirects invocations to a method of the specified field's instance.
*/
public MethodDelegation toField(String name, FieldLocator.Factory fieldLocatorFactory) {
return toField(name, fieldLocatorFactory, MethodGraph.Compiler.DEFAULT);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method on the instance of the supplied field. To be
* considered a valid delegation target, a method must be visible and accessible to the instrumented type. This is the
* case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param name The field's name.
* @param methodGraphCompiler The method graph compiler to use.
* @return A delegation that redirects invocations to a method of the specified field's instance.
*/
public MethodDelegation toField(String name, MethodGraph.Compiler methodGraphCompiler) {
return toField(name, FieldLocator.ForClassHierarchy.Factory.INSTANCE, methodGraphCompiler);
}
/**
* Delegates any intercepted method to invoke a non-{@code static} method on the instance of the supplied field. To be
* considered a valid delegation target, a method must be visible and accessible to the instrumented type. This is the
* case if the method's declaring type is either public or in the same package as the instrumented type and if the method
* is either public or non-private and in the same package as the instrumented type. Private methods can only be used as
* a delegation target if the delegation is targeting the instrumented type.
*
* @param name The field's name.
* @param fieldLocatorFactory The field locator factory to use.
* @param methodGraphCompiler The method graph compiler to use.
* @return A delegation that redirects invocations to a method of the specified field's instance.
*/
public MethodDelegation toField(String name, FieldLocator.Factory fieldLocatorFactory, MethodGraph.Compiler methodGraphCompiler) {
return new MethodDelegation(new ImplementationDelegate.ForField.WithLookup(name,
methodGraphCompiler,
parameterBinders,
matcher,
fieldLocatorFactory), parameterBinders, ambiguityResolver, bindingResolver);
}
/**
* Delegates any intercepted method to invoke a method on an instance that is returned by a parameterless method of the
* given name. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if
* the method is either public or non-private and in the same package as the instrumented type. Private methods can only
* be used as a delegation target if the delegation is targeting the instrumented type.
*
* @param name The name of the method that returns the delegation target.
* @return A delegation that redirects invocations to the return value of a method that is declared by the instrumented type.
*/
public MethodDelegation toMethodReturnOf(String name) {
return toMethodReturnOf(name, MethodGraph.Compiler.DEFAULT);
}
/**
* Delegates any intercepted method to invoke a method on an instance that is returned by a parameterless method of the
* given name. To be considered a valid delegation target, a method must be visible and accessible to the instrumented type.
* This is the case if the method's declaring type is either public or in the same package as the instrumented type and if
* the method is either public or non-private and in the same package as the instrumented type. Private methods can only
* be used as a delegation target if the delegation is targeting the instrumented type.
*
* @param name The name of the method that returns the delegation target.
* @param methodGraphCompiler The method graph compiler to use.
* @return A delegation that redirects invocations to the return value of a method that is declared by the instrumented type.
*/
public MethodDelegation toMethodReturnOf(String name, MethodGraph.Compiler methodGraphCompiler) {
return new MethodDelegation(new ImplementationDelegate.ForMethodReturn(name,
methodGraphCompiler,
parameterBinders,
matcher), parameterBinders, ambiguityResolver, bindingResolver);
}
}
}
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