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.spring.aop;
20
21 import org.apache.shiro.aop.AnnotationResolver;
22 import org.apache.shiro.aop.MethodInvocation;
23 import org.springframework.core.annotation.AnnotationUtils;
24 import org.springframework.util.ClassUtils;
25
26 import java.lang.annotation.Annotation;
27 import java.lang.reflect.Method;
28
29 /**
30 * {@code AnnotationResolver} implementation that uses Spring's more robust
31 * {@link AnnotationUtils AnnotationUtils} to find method annotations instead of the JDKs simpler
32 * (and rather lacking) {@link Method}.{@link Method#getAnnotation(Class) getAnnotation(class)}
33 * implementation.
34 *
35 * @since 1.1
36 */
37 public class SpringAnnotationResolver implements AnnotationResolver {
38
39 public Annotation getAnnotation(MethodInvocation mi, Class<? extends Annotation> clazz) {
40 Method m = mi.getMethod();
41
42 Annotation a = AnnotationUtils.findAnnotation(m, clazz);
43 if (a != null) return a;
44
45 //The MethodInvocation's method object could be a method defined in an interface.
46 //However, if the annotation existed in the interface's implementation (and not
47 //the interface itself), it won't be on the above method object. Instead, we need to
48 //acquire the method representation from the targetClass and check directly on the
49 //implementation itself:
50 Class<?> targetClass = mi.getThis().getClass();
51 m = ClassUtils.getMostSpecificMethod(m, targetClass);
52 a = AnnotationUtils.findAnnotation(m, clazz);
53 if (a != null) return a;
54 // See if the class has the same annotation
55 return AnnotationUtils.findAnnotation(mi.getThis().getClass(), clazz);
56 }
57 }