/*
* Copyright 2002-2015 the original author or authors.
*
* 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 org.springframework.aop.aspectj;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.reflect.MethodSignature;
import org.aspectj.lang.reflect.SourceLocation;
import org.aspectj.runtime.internal.AroundClosure;
import org.springframework.aop.ProxyMethodInvocation;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.util.Assert;
/**
* Implementation of AspectJ ProceedingJoinPoint interface
* wrapping an AOP Alliance MethodInvocation.
*
* <p><b>Note</b>: the {@code getThis()} method returns the current Spring AOP proxy.
* The {@code getTarget()} method returns the current Spring AOP target (which may be
* {@code null} if there is no target), and is a plain POJO without any advice.
* <b>If you want to call the object and have the advice take effect, use
* {@code getThis()}.</b> A common example is casting the object to an
* introduced interface in the implementation of an introduction.
*
* <p>Of course there is no such distinction between target and proxy in AspectJ.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Adrian Colyer
* @author Ramnivas Laddad
* @since 2.0
*/
public class MethodInvocationProceedingJoinPoint implements ProceedingJoinPoint, JoinPoint.StaticPart {
private static final ParameterNameDiscoverer parameterNameDiscoverer = new DefaultParameterNameDiscoverer();
private final ProxyMethodInvocation methodInvocation;
private Object[] defensiveCopyOfArgs;
/** Lazily initialized signature object */
private Signature signature;
/** Lazily initialized source location object */
private SourceLocation sourceLocation;
/**
* Create a new MethodInvocationProceedingJoinPoint, wrapping the given
* Spring ProxyMethodInvocation object.
* @param methodInvocation the Spring ProxyMethodInvocation object
*/
public MethodInvocationProceedingJoinPoint(ProxyMethodInvocation methodInvocation) {
Assert.notNull(methodInvocation, "MethodInvocation must not be null");
this.methodInvocation = methodInvocation;
}
@Override
public void set$AroundClosure(AroundClosure aroundClosure) {
throw new UnsupportedOperationException();
}
@Override
public Object proceed() throws Throwable {
return this.methodInvocation.invocableClone().proceed();
}
@Override
public Object proceed(Object[] arguments) throws Throwable {
Assert.notNull(arguments, "Argument array passed to proceed cannot be null");
if (arguments.length != this.methodInvocation.getArguments().length) {
throw new IllegalArgumentException("Expecting " +
this.methodInvocation.getArguments().length + " arguments to proceed, " +
"but was passed " + arguments.length + " arguments");
}
this.methodInvocation.setArguments(arguments);
return this.methodInvocation.invocableClone(arguments).proceed();
}
/**
* Returns the Spring AOP proxy. Cannot be {@code null}.
*/
@Override
public Object getThis() {
return this.methodInvocation.getProxy();
}
/**
* Returns the Spring AOP target. May be {@code null} if there is no target.
*/
@Override
public Object getTarget() {
return this.methodInvocation.getThis();
}
@Override
public Object[] getArgs() {
if (this.defensiveCopyOfArgs == null) {
Object[] argsSource = this.methodInvocation.getArguments();
this.defensiveCopyOfArgs = new Object[argsSource.length];
System.arraycopy(argsSource, 0, this.defensiveCopyOfArgs, 0, argsSource.length);
}
return this.defensiveCopyOfArgs;
}
@Override
public Signature getSignature() {
if (this.signature == null) {
this.signature = new MethodSignatureImpl();
}
return signature;
}
@Override
public SourceLocation getSourceLocation() {
if (this.sourceLocation == null) {
this.sourceLocation = new SourceLocationImpl();
}
return this.sourceLocation;
}
@Override
public String getKind() {
return ProceedingJoinPoint.METHOD_EXECUTION;
}
@Override
public int getId() {
// TODO: It's just an adapter but returning 0 might still have side effects...
return 0;
}
@Override
public JoinPoint.StaticPart getStaticPart() {
return this;
}
@Override
public String toShortString() {
return "execution(" + getSignature().toShortString() + ")";
}
@Override
public String toLongString() {
return "execution(" + getSignature().toLongString() + ")";
}
@Override
public String toString() {
return "execution(" + getSignature().toString() + ")";
}
/**
* Lazily initialized MethodSignature.
*/
private class MethodSignatureImpl implements MethodSignature {
private volatile String[] parameterNames;
@Override
public String getName() {
return methodInvocation.getMethod().getName();
}
@Override
public int getModifiers() {
return methodInvocation.getMethod().getModifiers();
}
@Override
public Class<?> getDeclaringType() {
return methodInvocation.getMethod().getDeclaringClass();
}
@Override
public String getDeclaringTypeName() {
return methodInvocation.getMethod().getDeclaringClass().getName();
}
@Override
public Class<?> getReturnType() {
return methodInvocation.getMethod().getReturnType();
}
@Override
public Method getMethod() {
return methodInvocation.getMethod();
}
@Override
public Class<?>[] getParameterTypes() {
return methodInvocation.getMethod().getParameterTypes();
}
@Override
public String[] getParameterNames() {
if (this.parameterNames == null) {
this.parameterNames = parameterNameDiscoverer.getParameterNames(getMethod());
}
return this.parameterNames;
}
@Override
public Class<?>[] getExceptionTypes() {
return methodInvocation.getMethod().getExceptionTypes();
}
@Override
public String toShortString() {
return toString(false, false, false, false);
}
@Override
public String toLongString() {
return toString(true, true, true, true);
}
@Override
public String toString() {
return toString(false, true, false, true);
}
private String toString(boolean includeModifier, boolean includeReturnTypeAndArgs,
boolean useLongReturnAndArgumentTypeName, boolean useLongTypeName) {
StringBuilder sb = new StringBuilder();
if (includeModifier) {
sb.append(Modifier.toString(getModifiers()));
sb.append(" ");
}
if (includeReturnTypeAndArgs) {
appendType(sb, getReturnType(), useLongReturnAndArgumentTypeName);
sb.append(" ");
}
appendType(sb, getDeclaringType(), useLongTypeName);
sb.append(".");
sb.append(getMethod().getName());
sb.append("(");
Class<?>[] parametersTypes = getParameterTypes();
appendTypes(sb, parametersTypes, includeReturnTypeAndArgs, useLongReturnAndArgumentTypeName);
sb.append(")");
return sb.toString();
}
private void appendTypes(StringBuilder sb, Class<?>[] types, boolean includeArgs,
boolean useLongReturnAndArgumentTypeName) {
if (includeArgs) {
for (int size = types.length, i = 0; i < size; i++) {
appendType(sb, types[i], useLongReturnAndArgumentTypeName);
if (i < size - 1) {
sb.append(",");
}
}
}
else {
if (types.length != 0) {
sb.append("..");
}
}
}
private void appendType(StringBuilder sb, Class<?> type, boolean useLongTypeName) {
if (type.isArray()) {
appendType(sb, type.getComponentType(), useLongTypeName);
sb.append("[]");
}
else {
sb.append(useLongTypeName ? type.getName() : type.getSimpleName());
}
}
}
/**
* Lazily initialized SourceLocation.
*/
private class SourceLocationImpl implements SourceLocation {
@Override
public Class<?> getWithinType() {
if (methodInvocation.getThis() == null) {
throw new UnsupportedOperationException("No source location joinpoint available: target is null");
}
return methodInvocation.getThis().getClass();
}
@Override
public String getFileName() {
throw new UnsupportedOperationException();
}
@Override
public int getLine() {
throw new UnsupportedOperationException();
}
@Override
@Deprecated
public int getColumn() {
throw new UnsupportedOperationException();
}
}
}