/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 package org.apache.shiro.spring.aop;

 import org.apache.shiro.aop.AnnotationResolver;

 import org.apache.shiro.aop.MethodInvocation;

 import org.springframework.core.annotation.AnnotationUtils;

 import org.springframework.util.ClassUtils;

 import java.lang.annotation.Annotation;

 import java.lang.reflect.Method;

 /**

  * {@code AnnotationResolver} implementation that uses Spring's more robust

  * {@link AnnotationUtils AnnotationUtils} to find method annotations instead of the JDKs simpler

  * (and rather lacking) {@link Method}.{@link Method#getAnnotation(Class) getAnnotation(class)}

  * implementation.

  *

  * @since 1.1

  */

 public class SpringAnnotationResolver implements AnnotationResolver {

     public Annotation getAnnotation(MethodInvocation mi, Class<? extends Annotation> clazz) {

         Method m = mi.getMethod();

         Annotation a = AnnotationUtils.findAnnotation(m, clazz);

         if (a != null) return a;

         //The MethodInvocation's method object could be a method defined in an interface.

         //However, if the annotation existed in the interface's implementation (and not

         //the interface itself), it won't be on the above method object.  Instead, we need to

         //acquire the method representation from the targetClass and check directly on the

         //implementation itself:

         Class<?> targetClass = mi.getThis().getClass();

         m = ClassUtils.getMostSpecificMethod(m, targetClass);

         a = AnnotationUtils.findAnnotation(m, clazz);

         if (a != null) return a;

         // See if the class has the same annotation

         return AnnotationUtils.findAnnotation(mi.getThis().getClass(), clazz);

     }

 }