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    package org.apache.xbean.finder.filter;
018    
019    import java.util.regex.Pattern;
020    
021    /**
022     * @version $Rev$ $Date$
023     */
024    public class PatternFilter implements Filter {
025    
026        private final Pattern pattern;
027    
028        public PatternFilter(String expression) {
029            this(Pattern.compile(expression));
030        }
031    
032        public PatternFilter(Pattern pattern) {
033            assert pattern != null;
034            this.pattern = pattern;
035        }
036    
037        public Pattern getPattern() {
038            return pattern;
039        }
040    
041        @Override
042        public boolean accept(String name) {
043            return pattern.matcher(name).matches();
044        }
045    
046        @Override
047        public boolean equals(Object o) {
048            if (this == o) return true;
049            if (o == null || getClass() != o.getClass()) return false;
050    
051            PatternFilter that = (PatternFilter) o;
052    
053            return pattern.pattern().equals(that.pattern.pattern());
054        }
055    
056        @Override
057        public int hashCode() {
058            return pattern.hashCode();
059        }
060    
061        @Override
062        public String toString() {
063            return "PatternFilter{" +
064                    "pattern=" + pattern +
065                    '}';
066        }
067    }