KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > caucho > quercus > program > IfStatement


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.program;
31
32 import com.caucho.quercus.Location;
33 import com.caucho.quercus.env.Env;
34 import com.caucho.quercus.env.Value;
35 import com.caucho.quercus.expr.Expr;
36
37 /**
38  * Represents an if statement.
39  */
40 public class IfStatement extends Statement {
41   private final Expr _test;
42   private final Statement _trueBlock;
43   private final Statement _falseBlock;
44
45   public IfStatement(Location location, Expr test, Statement trueBlock, Statement falseBlock)
46   {
47     super(location);
48
49     _test = test;
50     _trueBlock = trueBlock;
51     _falseBlock = falseBlock;
52   }
53
54   protected Expr getTest()
55   {
56     return _test;
57   }
58
59   protected Statement getTrueBlock()
60   {
61     return _trueBlock;
62   }
63
64   protected Statement getFalseBlock()
65   {
66     return _falseBlock;
67   }
68
69   /**
70    * Executes the 'if' statement, returning any value.
71    */
72   public Value execute(Env env)
73   {
74     if (_test.evalBoolean(env)) {
75       return _trueBlock.execute(env);
76     }
77     else if (_falseBlock != null) {
78       return _falseBlock.execute(env);
79     }
80     else
81       return null;
82   }
83 }
84
85
Popular Tags