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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  }