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


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.AbstractVarExpr;
38 import com.caucho.quercus.expr.Expr;
39
40 /**
41  * Represents a foreach statement.
42  */
43 public class ForeachStatement
44   extends Statement
45 {
46   protected final Expr _objExpr;
47
48   protected final AbstractVarExpr _key;
49
50   protected final AbstractVarExpr _value;
51   protected final boolean _isRef;
52
53   protected final Statement _block;
54
55   public ForeachStatement(Location location,
56                           Expr objExpr,
57                           AbstractVarExpr key,
58                           AbstractVarExpr value,
59                           boolean isRef,
60                           Statement block)
61   {
62     super(location);
63
64     _objExpr = objExpr;
65
66     _key = key;
67     _value = value;
68     _isRef = isRef;
69
70     _block = block;
71   }
72
73   public Value execute(Env env)
74   {
75     Value origObj = _objExpr.eval(env);
76     Value obj = origObj.copy();
77
78     if (_key == null && ! _isRef) {
79       for (Value value : obj.getValueArray(env)) {
80     _value.evalAssign(env, value);
81
82     Value result = _block.execute(env);
83
84     if (result == null || result instanceof ContinueValue) {
85     } else if (result instanceof BreakValue)
86       return null;
87     else
88       return result;
89       }
90
91       return null;
92     } else {
93       for (Value key : obj.getKeyArray()) {
94     if (_key != null)
95       _key.evalAssign(env, key);
96
97     if (_isRef) {
98       Value value = origObj.getRef(key);
99
100       _value.evalAssign(env, value);
101     } else {
102       Value value = obj.get(key).toValue();
103
104       _value.evalAssign(env, value);
105     }
106
107     Value result = _block.execute(env);
108
109     if (result == null || result instanceof ContinueValue) {
110     } else if (result instanceof BreakValue)
111       return null;
112     else
113       return result;
114       }
115     }
116
117     return null;
118   }
119 }
120
121
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