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Java > Open Source Codes > com > caucho > quercus > expr > StringLiteralExpr


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.expr;
31
32 import com.caucho.quercus.Location;
33 import com.caucho.quercus.env.Env;
34 import com.caucho.quercus.env.InternStringValue;
35 import com.caucho.quercus.env.StringValue;
36 import com.caucho.quercus.env.Value;
37
38 /**
39  * Represents a PHP string literal expression.
40  */

41 public class StringLiteralExpr extends Expr {
42   protected final StringValue _value;
43
44   public StringLiteralExpr(Location location, String JavaDoc value)
45   {
46     super(location);
47     _value = new InternStringValue(value);
48   }
49
50   public StringLiteralExpr(Location location, StringValue value)
51   {
52     super(location);
53     _value = value;
54   }
55
56   public StringLiteralExpr(String JavaDoc value)
57   {
58     this(Location.UNKNOWN, value);
59   }
60
61   public StringLiteralExpr(StringValue value)
62   {
63     this(Location.UNKNOWN, value);
64   }
65
66   /**
67    * Returns true for a literal expression.
68    */

69   public boolean isLiteral()
70   {
71     return true;
72   }
73
74   /**
75    * Evaluates the expression as a constant.
76    *
77    * @return the expression value.
78    */

79   public Value evalConstant()
80   {
81     return _value;
82   }
83
84   /**
85    * Evaluates the expression.
86    *
87    * @param env the calling environment.
88    *
89    * @return the expression value.
90    */

91   public Value eval(Env env)
92   {
93     return _value;
94   }
95
96   public String JavaDoc toString()
97   {
98     return "\"" + _value + "\"";
99   }
100 }
101
102
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