/*

  * 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.aspectj;

 import org.apache.shiro.aop.MethodInvocation;

 import org.aspectj.lang.JoinPoint;

 import org.aspectj.lang.reflect.AdviceSignature;

 import org.aspectj.lang.reflect.MethodSignature;

 import java.lang.reflect.Method;

 /**

  * Helper class that adapts an AspectJ {@link JoinPoint JoinPoint}.

  *

  * @since 1.0

  */

 public class BeforeAdviceMethodInvocationAdapter implements MethodInvocation {

     private Object _object;

     private Method _method;

     private Object[] _arguments;

     /**

      * Factory method that creates a new {@link BeforeAdviceMethodInvocationAdapter} instance

      * using the AspectJ {@link JoinPoint} provided. If the joint point passed in is not

      * a method joint point, this method throws an {@link IllegalArgumentException}.

      *

      * @param aJoinPoint The AspectJ {@link JoinPoint} to use to adapt the advice.

      * @return The created instance.

      * @throws IllegalArgumentException If the join point passed in does not involve a method call.

      */

     public static BeforeAdviceMethodInvocationAdapter createFrom(JoinPoint aJoinPoint) {

         if (aJoinPoint.getSignature() instanceof MethodSignature) {

             return new BeforeAdviceMethodInvocationAdapter(aJoinPoint.getThis(),

                     ((MethodSignature) aJoinPoint.getSignature()).getMethod(),

                     aJoinPoint.getArgs());

         } else if (aJoinPoint.getSignature() instanceof AdviceSignature) {

             return new BeforeAdviceMethodInvocationAdapter(aJoinPoint.getThis(),

                     ((AdviceSignature) aJoinPoint.getSignature()).getAdvice(),

                     aJoinPoint.getArgs());

         } else {

             throw new IllegalArgumentException("The joint point signature is invalid: expected a MethodSignature or an AdviceSignature but was " + aJoinPoint.getSignature());

         }

     }

     /**

      * Creates a new {@link BeforeAdviceMethodInvocationAdapter} instance.

      *

      * @param aMethod       The method to invoke.

      * @param someArguments The arguments of the method invocation.

      */

     public BeforeAdviceMethodInvocationAdapter(Object anObject, Method aMethod, Object[] someArguments) {

         _object = anObject;

         _method = aMethod;

         _arguments = someArguments;

     }

     /* (non-Javadoc)

     * @see org.apache.shiro.aop.MethodInvocation#getArguments()

     */

     public Object[] getArguments() {

         return _arguments;

     }

     /* (non-Javadoc)

     * @see org.apache.shiro.aop.MethodInvocation#getMethod()

     */

     public Method getMethod() {

         return _method;

     }

     /* (non-Javadoc)

     * @see org.apache.shiro.aop.MethodInvocation#proceed()

     */

     public Object proceed() throws Throwable {

         // Do nothing since this adapts a before advice

         return null;

     }

     /**

      * @since 1.0

      */

     public Object getThis() {

         return _object;

     }

 }