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


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.Quercus;
33
34 /**
35  * Represents a PHP string value.
36  */
37 public final class InternStringValue extends StringValueImpl {
38   private final int _hashCode;
39   private final Value _key;
40   private final int _type;
41
42   public InternStringValue(String JavaDoc value)
43   {
44     super(value.intern());
45
46     _hashCode = super.hashCode();
47     _key = super.toKey();
48     _type = super.getNumericType();
49   }
50
51   /**
52    * Interns the string.
53    */
54   public InternStringValue intern(Quercus quercus)
55   {
56     return this;
57   }
58
59   /**
60    * Returns true for a long
61    */
62   public final boolean isLong()
63   {
64     return _type == IS_LONG;
65   }
66
67   /**
68    * Returns true for a double
69    */
70   public final boolean isDouble()
71   {
72     return _type == IS_DOUBLE;
73   }
74
75   /**
76    * Returns true for a number
77    */
78   @Override JavaDoc
79   public final boolean isNumber()
80   {
81     return _type != IS_STRING;
82   }
83
84   /**
85    * Converts to a double.
86    */
87   protected int getNumericType()
88   {
89     return _type;
90   }
91
92   /**
93    * Converts to a key.
94    */
95   public final Value toKey()
96   {
97     return _key;
98   }
99
100   /**
101    * Returns the hash code.
102    */
103   public final int hashCode()
104   {
105     return _hashCode;
106   }
107
108   public String JavaDoc toInternString()
109   {
110     return toString();
111   }
112 }
113
114
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