1 package org.apache.commons.jcs3.engine.match;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.Set;
23 import java.util.regex.Pattern;
24 import java.util.stream.Collectors;
25
26 import org.apache.commons.jcs3.engine.match.behavior.IKeyMatcher;
27
28 /** This implementation of the KeyMatcher uses standard Java Pattern matching. */
29 public class KeyMatcherPatternImpl<K>
30 implements IKeyMatcher<K>
31 {
32 /** Serial version */
33 private static final long serialVersionUID = 6667352064144381264L;
34
35 /**
36 * Creates a pattern and find matches on the array.
37 * <p>
38 * @param pattern
39 * @param keyArray
40 * @return Set of the matching keys
41 */
42 @Override
43 public Set<K> getMatchingKeysFromArray( final String pattern, final Set<K> keyArray )
44 {
45 final Pattern compiledPattern = Pattern.compile( pattern );
46
47 return keyArray.stream()
48 .filter(key -> compiledPattern.matcher(key.toString()).matches())
49 .collect(Collectors.toSet());
50 }
51 }