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Java > Open Source Codes > com > caucho > quercus > env > DefinitionKey


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */
29
30 package com.caucho.quercus.env;
31
32 import com.caucho.quercus.page.QuercusPage;
33
34 import java.lang.ref.WeakReference JavaDoc;
35
36 /**
37  * Key for caching function definitions
38  */
39 public final class DefinitionKey {
40   // crc of the current definition
41 private final long _crc;
42
43   // the including page
44 private final WeakReference JavaDoc<QuercusPage> _includePageRef;
45
46   DefinitionKey(long crc, QuercusPage includePage)
47   {
48     _crc = crc;
49     _includePageRef = new WeakReference JavaDoc<QuercusPage>(includePage);
50   }
51
52   public int hashCode()
53   {
54     return (int) _crc;
55   }
56
57   public boolean equals(Object JavaDoc o)
58   {
59     if (! (o instanceof DefinitionKey))
60       return false;
61
62     DefinitionKey key = (DefinitionKey) o;
63
64     QuercusPage page = _includePageRef.get();
65     QuercusPage keyPage = key._includePageRef.get();
66
67     if (page == null || keyPage == null)
68       return false;
69     
70     return (_crc == key._crc && page.equals(keyPage));
71   }
72
73   public String JavaDoc toString()
74   {
75     QuercusPage page = _includePageRef.get();
76     
77     return "DefinitionKey[" + _crc + ", " + page + "]";
78   }
79 }
80
81
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