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}