01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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,
46: Statement trueBlock, Statement falseBlock) {
47: super (location);
48:
49: _test = test;
50: _trueBlock = trueBlock;
51: _falseBlock = falseBlock;
52: }
53:
54: protected Expr getTest() {
55: return _test;
56: }
57:
58: protected Statement getTrueBlock() {
59: return _trueBlock;
60: }
61:
62: protected Statement getFalseBlock() {
63: return _falseBlock;
64: }
65:
66: /**
67: * Executes the 'if' statement, returning any value.
68: */
69: public Value execute(Env env) {
70: if (_test.evalBoolean(env)) {
71: return _trueBlock.execute(env);
72: } else if (_falseBlock != null) {
73: return _falseBlock.execute(env);
74: } else
75: return null;
76: }
77: }
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