1 /*
2 * $Id: RegexpDefinitionPatternMatcher.java 795343 2009-07-18 11:26:09Z apetrelli $
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 package org.apache.tiles.definition.pattern.regexp;
23
24 import java.util.regex.Matcher;
25 import java.util.regex.Pattern;
26
27 import org.apache.tiles.Definition;
28 import org.apache.tiles.definition.pattern.DefinitionPatternMatcher;
29 import org.apache.tiles.definition.pattern.PatternUtil;
30
31 /**
32 * Matches regular expression patterns in definitions.
33 *
34 * @version $Rev: 795343 $ $Date: 2009-07-18 21:26:09 +1000 (Sat, 18 Jul 2009) $
35 * @since 2.2.0
36 */
37 public class RegexpDefinitionPatternMatcher implements DefinitionPatternMatcher {
38
39 /**
40 * The pattern to match.
41 */
42 private Pattern pattern;
43
44 /**
45 * The definition to use as a basis.
46 */
47 private Definition definition;
48
49 /**
50 * Constructor.
51 *
52 * @param pattern The pattern to use, in string form.
53 * @param definition The definition to use as a basis.
54 * @since 2.2.0
55 */
56 public RegexpDefinitionPatternMatcher(String pattern, Definition definition) {
57 this.pattern = Pattern.compile(pattern);
58 this.definition = definition;
59 }
60
61 /** {@inheritDoc} */
62 public Definition createDefinition(String definitionName) {
63 Definition retValue = null;
64 Matcher matcher = pattern.matcher(definitionName);
65 if (matcher.matches()) {
66 int groupCount = matcher.groupCount() + 1;
67 Object[] vars = new Object[groupCount];
68 for (int i = 0; i < groupCount; i++) {
69 vars[i] = matcher.group(i);
70 }
71 retValue = PatternUtil.replacePlaceholders(definition,
72 definitionName, vars);
73 }
74 return retValue;
75 }
76 }