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 */
017package org.apache.xbean.finder.filter;
018
019import java.util.regex.Pattern;
020
021/**
022 * @version $Rev$ $Date$
023 */
024public 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    public boolean accept(String name) {
042        return pattern.matcher(name).matches();
043    }
044
045    @Override
046    public boolean equals(Object o) {
047        if (this == o) return true;
048        if (o == null || getClass() != o.getClass()) return false;
049
050        PatternFilter that = (PatternFilter) o;
051
052        return pattern.pattern().equals(that.pattern.pattern());
053    }
054
055    @Override
056    public int hashCode() {
057        return pattern.hashCode();
058    }
059
060    @Override
061    public String toString() {
062        return "PatternFilter{" +
063                "pattern=" + pattern +
064                '}';
065    }
066}