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    
024    /**
025     * A method filter implementation that returns true if the method's name matches a supplied regular expression (JDK
026     * regex) pattern string.
027     *
028     * @author James Carman
029     * @since 1.0
030     */
031    public class PatternFilter implements MethodFilter
032    {
033    //----------------------------------------------------------------------------------------------------------------------
034    // Fields
035    //----------------------------------------------------------------------------------------------------------------------
036    
037        public static String GETTER_SETTER_PATTERN = "get\\w+|set\\w+";
038        private final String pattern;
039    
040    //----------------------------------------------------------------------------------------------------------------------
041    // Static Methods
042    //----------------------------------------------------------------------------------------------------------------------
043    
044        /**
045         * Returns a {@link MethodFilter} which accepts only "getters" and "setters."
046         *
047         * @return a {@link MethodFilter} which accepts only "getters" and "setters."
048         */
049        public static MethodFilter getterSetterFilter()
050        {
051            return new PatternFilter( GETTER_SETTER_PATTERN );
052        }
053    
054    //----------------------------------------------------------------------------------------------------------------------
055    // Constructors
056    //----------------------------------------------------------------------------------------------------------------------
057    
058        public PatternFilter( String pattern )
059        {
060            this.pattern = pattern;
061        }
062    
063    //----------------------------------------------------------------------------------------------------------------------
064    // MethodFilter Implementation
065    //----------------------------------------------------------------------------------------------------------------------
066    
067        public boolean accepts( Method method )
068        {
069            return method.getName().matches( pattern );
070        }
071    }
072