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Java > Open Source Codes > org > apache > oro > text > PatternCacheLRU


1 package org.apache.oro.text;
2
3 /* ====================================================================
4  * The Apache Software License, Version 1.1
5  *
6  * Copyright (c) 2000 The Apache Software Foundation. All rights
7  * reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution,
22  * if any, must include the following acknowledgment:
23  * "This product includes software developed by the
24  * Apache Software Foundation (http://www.apache.org/)."
25  * Alternately, this acknowledgment may appear in the software itself,
26  * if and wherever such third-party acknowledgments normally appear.
27  *
28  * 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro"
29  * must not be used to endorse or promote products derived from this
30  * software without prior written permission. For written
31  * permission, please contact apache@apache.org.
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33  * 5. Products derived from this software may not be called "Apache"
34  * or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their
35  * name, without prior written permission of the Apache Software Foundation.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals on behalf of the Apache Software Foundation. For more
53  * information on the Apache Software Foundation, please see
54  * <http://www.apache.org/>.
55  *
56  * Portions of this software are based upon software originally written
57  * by Daniel F. Savarese. We appreciate his contributions.
58  */
59
60 import java.util.*;
61
62 import org.apache.oro.text.regex.*;
63 import org.apache.oro.util.*;
64
65 /**
66  * This class is a GenericPatternCache subclass implementing an LRU
67  * (Least Recently Used) cache replacement policy. In other words,
68  * patterns are added to the cache until it becomes full. Once the
69  * cache is full, when a new pattern is added to the cache, it replaces
70  * the least recently used pattern currently in the cache. This is probably
71  * the best general purpose pattern cache replacement policy.
72
73  @author <a HREF="dfs@savarese.org">Daniel F. Savarese</a>
74  @version $Id: PatternCacheLRU.java,v 1.1.1.1 2000/07/23 23:08:49 jon Exp $
75
76  * @see GenericPatternCache
77  */
78 public final class PatternCacheLRU extends GenericPatternCache {
79
80   /**
81    * Creates a PatternCacheLRU instance with a given cache capacity,
82    * and initialized to use a given PatternCompiler instance as a pattern
83    * compiler.
84    * <p>
85    * @param capacity The capacity of the cache.
86    * @param compiler The PatternCompiler to use to compile patterns.
87    */
88   public PatternCacheLRU(int capacity, PatternCompiler compiler) {
89     super(new CacheLRU(capacity), compiler);
90   }
91
92   /**
93    * Same as:
94    * <blockquote><pre>
95    * PatternCacheLRU(GenericPatternCache.DEFAULT_CAPACITY, compiler);
96    * </pre></blockquote>
97    */
98   public PatternCacheLRU(PatternCompiler compiler) {
99     this(GenericPatternCache.DEFAULT_CAPACITY, compiler);
100   }
101
102
103   /**
104    * Same as:
105    * <blockquote><pre>
106    * PatternCacheLRU(capacity, new Perl5Compiler());
107    * </pre></blockquote>
108    */
109   public PatternCacheLRU(int capacity) {
110     this(capacity, new Perl5Compiler());
111   }
112
113   /**
114    * Same as:
115    * <blockquote><pre>
116    * PatternCacheLRU(GenericPatternCache.DEFAULT_CAPACITY);
117    * </pre></blockquote>
118    */
119   public PatternCacheLRU() {
120     this(GenericPatternCache.DEFAULT_CAPACITY);
121   }
122
123 }
124
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