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Java > Open Source Codes > org > apache > oro > text > PatternCacheFIFO2


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.
32  *
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 a second
67  * chance FIFO (First In First Out) cache replacement policy. In other
68  * words, patterns are added to the cache until the cache becomes full.
69  * Once the cache is full, when a new pattern is added to the cache, it
70  * replaces the first of the current patterns in the cache to have been
71  * added, unless that pattern has been used recently (generally
72  * between the last cache replacement and now).
73  * If the pattern to be replaced has been used, it is given
74  * a second chance, and the next pattern in the cache is tested for
75  * replacement in the same manner. If all the patterns are given a
76  * second chance, then the original pattern selected for replacement is
77  * replaced.
78
79  @author <a HREF="dfs@savarese.org">Daniel F. Savarese</a>
80  @version $Id: PatternCacheFIFO2.java,v 1.1.1.1 2000/07/23 23:08:49 jon Exp $
81
82  * @see GenericPatternCache
83  */
84 public final class PatternCacheFIFO2 extends GenericPatternCache {
85
86   /**
87    * Creates a PatternCacheFIFO2 instance with a given cache capacity,
88    * initialized to use a given PatternCompiler instance as a pattern compiler.
89    * <p>
90    * @param capacity The capacity of the cache.
91    * @param compiler The PatternCompiler to use to compile patterns.
92    */
93   public PatternCacheFIFO2(int capacity, PatternCompiler compiler) {
94     super(new CacheFIFO2(capacity), compiler);
95   }
96
97
98   /**
99    * Same as:
100    * <blockquote><pre>
101    * PatternCacheFIFO2(GenericPatternCache.DEFAULT_CAPACITY, compiler);
102    * </pre></blockquote>
103    */
104   public PatternCacheFIFO2(PatternCompiler compiler) {
105     this(GenericPatternCache.DEFAULT_CAPACITY, compiler);
106   }
107
108
109   /**
110    * Same as:
111    * <blockquote><pre>
112    * PatternCacheFIFO2(capacity, new Perl5Compiler());
113    * </pre></blockquote>
114    */
115   public PatternCacheFIFO2(int capacity) {
116     this(capacity, new Perl5Compiler());
117   }
118
119
120   /**
121    * Same as:
122    * <blockquote><pre>
123    * PatternCacheFIFO2(GenericPatternCache.DEFAULT_CAPACITY);
124    * </pre></blockquote>
125    */
126   public PatternCacheFIFO2() {
127     this(GenericPatternCache.DEFAULT_CAPACITY);
128   }
129
130 }
131
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