/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited

  *

  * Licensed 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.acegisecurity.intercept.method.aopalliance;

 import org.acegisecurity.intercept.method.MethodDefinitionSource;

 import org.aopalliance.intercept.MethodInvocation;

 import org.springframework.aop.framework.AopConfigException;

 import org.springframework.aop.support.StaticMethodMatcherPointcutAdvisor;

 import java.lang.reflect.AccessibleObject;

 import java.lang.reflect.Method;

 /**

  * Advisor driven by a {@link MethodDefinitionSource}, used to exclude a {@link MethodSecurityInterceptor} from

  * public (ie non-secure) methods.<p>Because the AOP framework caches advice calculations, this is normally faster

  * than just letting the <code>MethodSecurityInterceptor</code> run and find out itself that it has no work to do.</p>

  *  <p>This class also allows the use of Spring's <code>DefaultAdvisorAutoProxyCreator</code>, which makes

  * configuration easier than setup a <code>ProxyFactoryBean</code> for each object requiring security. Note that

  * autoproxying is not supported for BeanFactory implementations, as post-processing is automatic only for application

  * contexts.</p>

  *  <p>Based on Spring's TransactionAttributeSourceAdvisor.</p>

  *

  * @author Ben Alex

  * @version $Id: MethodDefinitionSourceAdvisor.java 1784 2007-02-24 21:00:24Z luke_t $

  */

 public class MethodDefinitionSourceAdvisor extends StaticMethodMatcherPointcutAdvisor {

     //~ Instance fields ================================================================================================

     private MethodDefinitionSource transactionAttributeSource;

     //~ Constructors ===================================================================================================

     public MethodDefinitionSourceAdvisor(MethodSecurityInterceptor advice) {

         super(advice);

         if (advice.getObjectDefinitionSource() == null) {

             throw new AopConfigException("Cannot construct a MethodDefinitionSourceAdvisor using a "

                 + "MethodSecurityInterceptor that has no ObjectDefinitionSource configured");

         }

         this.transactionAttributeSource = advice.getObjectDefinitionSource();

     }

     //~ Methods ========================================================================================================

     public boolean matches(Method m, Class targetClass) {

         MethodInvocation methodInvocation = new InternalMethodInvocation(m);

         return (this.transactionAttributeSource.getAttributes(methodInvocation) != null);

     }

     //~ Inner Classes ==================================================================================================

     /**

      * Represents a <code>MethodInvocation</code>.

      * <p>Required as <code>MethodDefinitionSource</code> only supports lookup of configuration attributes for

      * <code>MethodInvocation</code>s.</p>

      */

     class InternalMethodInvocation implements MethodInvocation {

         private Method method;

         public InternalMethodInvocation(Method method) {

             this.method = method;

         }

         protected InternalMethodInvocation() {

             throw new UnsupportedOperationException();

         }

         public Object[] getArguments() {

             throw new UnsupportedOperationException();

         }

         public Method getMethod() {

             return this.method;

         }

         public AccessibleObject getStaticPart() {

             throw new UnsupportedOperationException();

         }

         public Object getThis() {

             throw new UnsupportedOperationException();

         }

         public Object proceed() throws Throwable {

             throw new UnsupportedOperationException();

         }

     }

 }