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


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.NullValue;
35 import com.caucho.quercus.env.Value;
36 import com.caucho.quercus.expr.Expr;
37
38 /**
39  * Represents a return expression statement in a PHP program.
40  */
41 public class ReturnStatement extends Statement {
42   protected final Expr _expr;
43   
44   /**
45    * Creates the echo statement.
46    */
47   public ReturnStatement(Expr expr)
48   {
49     _expr = expr;
50   }
51   
52   /**
53    * Creates the echo statement.
54    */
55   public ReturnStatement(Location location, Expr expr)
56   {
57     super(location);
58
59     _expr = expr;
60   }
61
62   /**
63    * Executes the statement, returning the expression value.
64    */
65   public Value execute(Env env)
66   {
67     if (_expr != null)
68       return _expr.eval(env);
69     else
70       return NullValue.NULL;
71   }
72
73   /**
74    * Returns true if control can go past the statement.
75    */
76   public int fallThrough()
77   {
78     return RETURN;
79   }
80 }
81
82
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