1 package org.apache.commons.jcs.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 org.apache.commons.jcs.engine.match.behavior.IKeyMatcher;
23
24 import java.util.HashSet;
25 import java.util.Set;
26 import java.util.regex.Matcher;
27 import java.util.regex.Pattern;
28
29 /** This implementation of the KeyMatcher uses standard Java Pattern matching. */
30 public class KeyMatcherPatternImpl<K>
31 implements IKeyMatcher<K>
32 {
33 /** Serial version */
34 private static final long serialVersionUID = 6667352064144381264L;
35
36 /**
37 * Creates a pattern and find matches on the array.
38 * <p>
39 * @param pattern
40 * @param keyArray
41 * @return Set of the matching keys
42 */
43 @Override
44 public Set<K> getMatchingKeysFromArray( String pattern, Set<K> keyArray )
45 {
46 Pattern compiledPattern = Pattern.compile( pattern );
47
48 Set<K> matchingKeys = new HashSet<K>();
49
50 // Look for matches
51 for (K key : keyArray)
52 {
53 // TODO we might want to match on the toString.
54 if ( key instanceof String )
55 {
56 Matcher matcher = compiledPattern.matcher( (String) key );
57 if ( matcher.matches() )
58 {
59 matchingKeys.add( key );
60 }
61 }
62 }
63
64 return matchingKeys;
65 }
66 }