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


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.BreakValue;
34 import com.caucho.quercus.env.ContinueValue;
35 import com.caucho.quercus.env.Env;
36 import com.caucho.quercus.env.Value;
37 import com.caucho.quercus.expr.Expr;
38
39 /**
40  * Represents a do ... while statement.
41  */
42 public class DoStatement extends Statement {
43   protected final Expr _test;
44   protected final Statement _block;
45
46   public DoStatement(Location location, Expr test, Statement block)
47   {
48
49     super(location);
50
51     _test = test;
52     _block = block;
53   }
54
55   public Value execute(Env env)
56   {
57     try {
58       do {
59         env.checkTimeout();
60
61         Value value = _block.execute(env);
62
63         if (value == null) {
64         }
65         else if (value == BreakValue.BREAK)
66           return null;
67         else if (value == ContinueValue.CONTINUE) {
68         }
69         else
70           return value;
71       } while (_test.evalBoolean(env));
72     }
73     catch (RuntimeException JavaDoc e) {
74       rethrow(e, RuntimeException JavaDoc.class);
75     }
76
77     return null;
78   }
79 }
80
81
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