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.filter;
019    
020    import org.apache.commons.proxy.interceptor.MethodFilter;
021    
022    import java.lang.reflect.Method;
023    import java.util.Arrays;
024    import java.util.Collection;
025    import java.util.HashSet;
026    import java.util.Set;
027    
028    /**
029     * Filters methods based on their return type.
030     *
031     * @author James Carman
032     * @since 1.0
033     */
034    public class ReturnTypeFilter implements MethodFilter
035    {
036    //**********************************************************************************************************************
037    // Fields
038    //**********************************************************************************************************************
039    
040        private final Set validReturnTypes = new HashSet();
041    
042    //**********************************************************************************************************************
043    // Constructors
044    //**********************************************************************************************************************
045    
046        public ReturnTypeFilter( Class[] validReturnTypes )
047        {
048            this(Arrays.asList(validReturnTypes));
049        }
050    
051        public ReturnTypeFilter( Collection validReturnTypes )
052        {
053            this.validReturnTypes.addAll(validReturnTypes);
054        }
055    
056    //**********************************************************************************************************************
057    // MethodFilter Implementation
058    //**********************************************************************************************************************
059    
060    
061        public boolean accepts( Method method )
062        {
063            return validReturnTypes.contains(method.getReturnType());
064        }
065    }