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Java > Open Source Codes > com > jeantessier > text > MaximumCapacityPatternCache


1 /*
2  * Copyright (c) 2001-2005, Jean Tessier
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * * Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * * Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  *
16  * * Neither the name of Jean Tessier nor the names of his contributors
17  * may be used to endorse or promote products derived from this software
18  * without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 package com.jeantessier.text;
34
35 import java.util.*;
36
37 import org.apache.oro.text.*;
38 import org.apache.oro.text.regex.*;
39
40 public class MaximumCapacityPatternCache implements PatternCache {
41     PatternCompiler compiler;
42
43     Map map = new HashMap();
44     
45     public MaximumCapacityPatternCache() {
46         this(new Perl5Compiler());
47     }
48
49     public MaximumCapacityPatternCache(PatternCompiler compiler) {
50         this.compiler = compiler;
51     }
52     
53     public Pattern addPattern(String JavaDoc expression) throws MalformedPatternException {
54         Pattern result = (Pattern) map.get(expression);
55
56         if (result == null) {
57             result = compiler.compile(expression);
58             map.put(expression, result);
59         }
60         
61         return result;
62     }
63
64     public Pattern addPattern(String JavaDoc expression, int options) throws MalformedPatternException {
65         Pattern result = (Pattern) map.get(expression);
66
67         if (result == null) {
68             result = compiler.compile(expression, options);
69             map.put(expression, result);
70         }
71         
72         return result;
73     }
74
75     public Pattern getPattern(String JavaDoc expression) throws MalformedCachePatternException {
76         Pattern result = (Pattern) map.get(expression);
77
78         if (result == null) {
79             try {
80                 result = compiler.compile(expression);
81             } catch (MalformedPatternException ex) {
82                 throw new MalformedCachePatternException(ex.getMessage());
83             }
84             map.put(expression, result);
85         }
86         
87         return result;
88     }
89
90     public Pattern getPattern(String JavaDoc expression, int options) throws MalformedCachePatternException {
91         Pattern result = (Pattern) map.get(expression);
92
93         if (result == null) {
94             try {
95                 result = compiler.compile(expression, options);
96             } catch (MalformedPatternException ex) {
97                 throw new MalformedCachePatternException(ex.getMessage());
98             }
99             map.put(expression, result);
100         }
101         
102         return result;
103     }
104
105     public int size() {
106         return map.size();
107     }
108
109     public int capacity() {
110         return 20;
111     }
112 }
113
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