1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.shiro.aspectj;
20
21 import org.apache.shiro.aop.MethodInvocation;
22 import org.aspectj.lang.JoinPoint;
23 import org.aspectj.lang.reflect.AdviceSignature;
24 import org.aspectj.lang.reflect.MethodSignature;
25
26 import java.lang.reflect.Method;
27
28 /**
29 * Helper class that adapts an AspectJ {@link JoinPoint JoinPoint}.
30 *
31 * @since 1.0
32 */
33 public class BeforeAdviceMethodInvocationAdapter implements MethodInvocation {
34
35 private Object _object;
36 private Method _method;
37 private Object[] _arguments;
38
39 /**
40 * Factory method that creates a new {@link BeforeAdviceMethodInvocationAdapter} instance
41 * using the AspectJ {@link JoinPoint} provided. If the joint point passed in is not
42 * a method joint point, this method throws an {@link IllegalArgumentException}.
43 *
44 * @param aJoinPoint The AspectJ {@link JoinPoint} to use to adapt the advice.
45 * @return The created instance.
46 * @throws IllegalArgumentException If the join point passed in does not involve a method call.
47 */
48 public static BeforeAdviceMethodInvocationAdapter createFrom(JoinPoint aJoinPoint) {
49 if (aJoinPoint.getSignature() instanceof MethodSignature) {
50 return new BeforeAdviceMethodInvocationAdapter(aJoinPoint.getThis(),
51 ((MethodSignature) aJoinPoint.getSignature()).getMethod(),
52 aJoinPoint.getArgs());
53
54 } else if (aJoinPoint.getSignature() instanceof AdviceSignature) {
55 return new BeforeAdviceMethodInvocationAdapter(aJoinPoint.getThis(),
56 ((AdviceSignature) aJoinPoint.getSignature()).getAdvice(),
57 aJoinPoint.getArgs());
58
59 } else {
60 throw new IllegalArgumentException("The joint point signature is invalid: expected a MethodSignature or an AdviceSignature but was " + aJoinPoint.getSignature());
61 }
62 }
63
64 /**
65 * Creates a new {@link BeforeAdviceMethodInvocationAdapter} instance.
66 *
67 * @param aMethod The method to invoke.
68 * @param someArguments The arguments of the method invocation.
69 */
70 public BeforeAdviceMethodInvocationAdapter(Object anObject, Method aMethod, Object[] someArguments) {
71 _object = anObject;
72 _method = aMethod;
73 _arguments = someArguments;
74 }
75
76 /* (non-Javadoc)
77 * @see org.apache.shiro.aop.MethodInvocation#getArguments()
78 */
79
80 public Object[] getArguments() {
81 return _arguments;
82 }
83
84 /* (non-Javadoc)
85 * @see org.apache.shiro.aop.MethodInvocation#getMethod()
86 */
87
88 public Method getMethod() {
89 return _method;
90 }
91
92 /* (non-Javadoc)
93 * @see org.apache.shiro.aop.MethodInvocation#proceed()
94 */
95
96 public Object proceed() throws Throwable {
97 // Do nothing since this adapts a before advice
98 return null;
99 }
100
101 /**
102 * @since 1.0
103 */
104 public Object getThis() {
105 return _object;
106 }
107 }