001package org.apache.commons.jcs3.engine.match;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *   http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.util.Set;
023import java.util.regex.Pattern;
024import java.util.stream.Collectors;
025
026import org.apache.commons.jcs3.engine.match.behavior.IKeyMatcher;
027
028/** This implementation of the KeyMatcher uses standard Java Pattern matching. */
029public class KeyMatcherPatternImpl<K>
030    implements IKeyMatcher<K>
031{
032    /** Serial version */
033    private static final long serialVersionUID = 6667352064144381264L;
034
035    /**
036     * Creates a pattern and find matches on the array.
037     * <p>
038     * @param pattern
039     * @param keyArray
040     * @return Set of the matching keys
041     */
042    @Override
043    public Set<K> getMatchingKeysFromArray( final String pattern, final Set<K> keyArray )
044    {
045        final Pattern compiledPattern = Pattern.compile( pattern );
046
047        return keyArray.stream()
048                .filter(key -> compiledPattern.matcher(key.toString()).matches())
049                .collect(Collectors.toSet());
050    }
051}