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


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 java.io.IOException JavaDoc;
33 import java.io.PrintWriter JavaDoc;
34
35 /**
36  * Represents a PHP default value.
37  */
38 public class DefaultValue extends NullValue {
39   public static final DefaultValue DEFAULT
40     = new DefaultValue();
41
42   private DefaultValue()
43   {
44   }
45
46   /**
47    * Returns the null value singleton.
48    */
49   public static DefaultValue create()
50   {
51     return DEFAULT;
52   }
53   
54   /**
55    * Converts to a boolean.
56    */
57   public boolean toBoolean()
58   {
59     return false;
60   }
61   
62   /**
63    * Converts to a long.
64    */
65   public long toLong()
66   {
67     return 0;
68   }
69   
70   /**
71    * Converts to a double.
72    */
73   public double toDouble()
74   {
75     return 0;
76   }
77   
78   /**
79    * Converts to an object.
80    */
81   public Object JavaDoc toObject()
82   {
83     return "";
84   }
85   
86   /**
87    * Prints the value.
88    * @param env
89    */
90   public void print(Env env)
91   {
92   }
93   
94   /**
95    * Converts to a string.
96    * @param env
97    */
98   public String JavaDoc toString()
99   {
100     return "";
101   }
102
103   /**
104    * Generates code to recreate the expression.
105    *
106    * @param out the writer to the Java source code.
107    */
108   public void generate(PrintWriter JavaDoc out)
109     throws IOException JavaDoc
110   {
111     out.print("DefaultValue.DEFAULT");
112   }
113
114   /**
115    * Generates code to recreate the expression.
116    *
117    * @param out the writer to the Java source code.
118    */
119   public void generateLong(PrintWriter JavaDoc out)
120     throws IOException JavaDoc
121   {
122     out.print("0");
123   }
124
125   /**
126    * Generates code to recreate the expression.
127    *
128    * @param out the writer to the Java source code.
129    */
130   public void generateString(PrintWriter JavaDoc out)
131     throws IOException JavaDoc
132   {
133     out.print("\"\"");
134   }
135   
136   //
137 // Java Serialization
138 //
139
140   private Object JavaDoc readResolve()
141   {
142     return DEFAULT;
143   }
144 }
145
146
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