001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018 package org.apache.commons.proxy.interceptor; 019 020 import org.apache.commons.proxy.Invocation; 021 import org.apache.commons.proxy.Interceptor; 022 023 /** 024 * Decorates another <code>MethodInterceptor</code> by only calling it if the method is accepted by the supplied 025 * <code>MethodFilter</code>. 026 * 027 * @author James Carman 028 * @since 1.0 029 */ 030 public class FilteredInterceptor implements Interceptor 031 { 032 //---------------------------------------------------------------------------------------------------------------------- 033 // Fields 034 //---------------------------------------------------------------------------------------------------------------------- 035 036 private final Interceptor inner; 037 private final MethodFilter filter; 038 039 //---------------------------------------------------------------------------------------------------------------------- 040 // Constructors 041 //---------------------------------------------------------------------------------------------------------------------- 042 043 public FilteredInterceptor( Interceptor inner, MethodFilter filter ) 044 { 045 this.inner = inner; 046 this.filter = filter; 047 } 048 049 //---------------------------------------------------------------------------------------------------------------------- 050 // MethodInterceptor Implementation 051 //---------------------------------------------------------------------------------------------------------------------- 052 053 public Object intercept( Invocation invocation ) throws Throwable 054 { 055 if( filter.accepts( invocation.getMethod() ) ) 056 { 057 return inner.intercept( invocation ); 058 } 059 else 060 { 061 return invocation.proceed(); 062 } 063 } 064 } 065