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 * @since 1.0
032 */
033 public class BeforeAdviceMethodInvocationAdapter implements MethodInvocation {
034
035 private Object _object;
036 private Method _method;
037 private Object[] _arguments;
038
039 /**
040 * Factory method that creates a new {@link BeforeAdviceMethodInvocationAdapter} instance
041 * using the AspectJ {@link JoinPoint} provided. If the joint point passed in is not
042 * a method joint point, this method throws an {@link IllegalArgumentException}.
043 *
044 * @param aJoinPoint The AspectJ {@link JoinPoint} to use to adapt the advice.
045 * @return The created instance.
046 * @throws IllegalArgumentException If the join point passed in does not involve a method call.
047 */
048 public static BeforeAdviceMethodInvocationAdapter createFrom(JoinPoint aJoinPoint) {
049 if (aJoinPoint.getSignature() instanceof MethodSignature) {
050 return new BeforeAdviceMethodInvocationAdapter(aJoinPoint.getThis(),
051 ((MethodSignature) aJoinPoint.getSignature()).getMethod(),
052 aJoinPoint.getArgs());
053
054 } else if (aJoinPoint.getSignature() instanceof AdviceSignature) {
055 return new BeforeAdviceMethodInvocationAdapter(aJoinPoint.getThis(),
056 ((AdviceSignature) aJoinPoint.getSignature()).getAdvice(),
057 aJoinPoint.getArgs());
058
059 } else {
060 throw new IllegalArgumentException("The joint point signature is invalid: expected a MethodSignature or an AdviceSignature but was " + aJoinPoint.getSignature());
061 }
062 }
063
064 /**
065 * Creates a new {@link BeforeAdviceMethodInvocationAdapter} instance.
066 *
067 * @param aMethod The method to invoke.
068 * @param someArguments The arguments of the method invocation.
069 */
070 public BeforeAdviceMethodInvocationAdapter(Object anObject, Method aMethod, Object[] someArguments) {
071 _object = anObject;
072 _method = aMethod;
073 _arguments = someArguments;
074 }
075
076 /* (non-Javadoc)
077 * @see org.apache.shiro.aop.MethodInvocation#getArguments()
078 */
079
080 public Object[] getArguments() {
081 return _arguments;
082 }
083
084 /* (non-Javadoc)
085 * @see org.apache.shiro.aop.MethodInvocation#getMethod()
086 */
087
088 public Method getMethod() {
089 return _method;
090 }
091
092 /* (non-Javadoc)
093 * @see org.apache.shiro.aop.MethodInvocation#proceed()
094 */
095
096 public Object proceed() throws Throwable {
097 // Do nothing since this adapts a before advice
098 return null;
099 }
100
101 /**
102 * @since 1.0
103 */
104 public Object getThis() {
105 return _object;
106 }
107 }