001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019 package org.apache.shiro.aspectj;
020
021 import org.apache.shiro.aop.MethodInvocation;
022 import org.aspectj.lang.JoinPoint;
023 import org.aspectj.lang.reflect.AdviceSignature;
024 import org.aspectj.lang.reflect.MethodSignature;
025
026 import java.lang.reflect.Method;
027
028 /**
029 * Helper class that adapts an AspectJ {@link JoinPoint JoinPoint}.
030 *
031 * @author J-C Desrochers
032 * @since 1.0
033 */
034 public class BeforeAdviceMethodInvocationAdapter implements MethodInvocation {
035
036 private Object _object;
037 private Method _method;
038 private Object[] _arguments;
039
040 /**
041 * Factory method that creates a new {@link BeforeAdviceMethodInvocationAdapter} instance
042 * using the AspectJ {@link JoinPoint} provided. If the joint point passed in is not
043 * a method joint point, this method throws an {@link IllegalArgumentException}.
044 *
045 * @param aJoinPoint The AspectJ {@link JoinPoint} to use to adapt the advice.
046 * @return The created instance.
047 * @throws IllegalArgumentException If the join point passed in does not involve a method call.
048 */
049 public static BeforeAdviceMethodInvocationAdapter createFrom(JoinPoint aJoinPoint) {
050 if (aJoinPoint.getSignature() instanceof MethodSignature) {
051 return new BeforeAdviceMethodInvocationAdapter(aJoinPoint.getThis(),
052 ((MethodSignature) aJoinPoint.getSignature()).getMethod(),
053 aJoinPoint.getArgs());
054
055 } else if (aJoinPoint.getSignature() instanceof AdviceSignature) {
056 return new BeforeAdviceMethodInvocationAdapter(aJoinPoint.getThis(),
057 ((AdviceSignature) aJoinPoint.getSignature()).getAdvice(),
058 aJoinPoint.getArgs());
059
060 } else {
061 throw new IllegalArgumentException("The joint point signature is invalid: expected a MethodSignature or an AdviceSignature but was " + aJoinPoint.getSignature());
062 }
063 }
064
065 /**
066 * Creates a new {@link BeforeAdviceMethodInvocationAdapter} instance.
067 *
068 * @param aMethod The method to invoke.
069 * @param someArguments The arguments of the method invocation.
070 */
071 public BeforeAdviceMethodInvocationAdapter(Object anObject, Method aMethod, Object[] someArguments) {
072 _object = anObject;
073 _method = aMethod;
074 _arguments = someArguments;
075 }
076
077 /* (non-Javadoc)
078 * @see org.apache.shiro.aop.MethodInvocation#getArguments()
079 */
080
081 public Object[] getArguments() {
082 return _arguments;
083 }
084
085 /* (non-Javadoc)
086 * @see org.apache.shiro.aop.MethodInvocation#getMethod()
087 */
088
089 public Method getMethod() {
090 return _method;
091 }
092
093 /* (non-Javadoc)
094 * @see org.apache.shiro.aop.MethodInvocation#proceed()
095 */
096
097 public Object proceed() throws Throwable {
098 // Do nothing since this adapts a before advice
099 return null;
100 }
101
102 /**
103 * @since 1.0
104 */
105 public Object getThis() {
106 return _object;
107 }
108 }