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Java > Open Source Codes > com > caucho > quercus > expr > ListHeadExpr


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.expr;
31
32 import com.caucho.quercus.env.Env;
33 import com.caucho.quercus.env.LongValue;
34 import com.caucho.quercus.env.Value;
35
36 import java.util.ArrayList JavaDoc;
37
38 /**
39  * Represents a list assignment expression.
40  */
41 public class ListHeadExpr extends Expr {
42   protected final Expr []_varList;
43   protected final Value []_keyList;
44
45   private String JavaDoc _varName;
46
47   public ListHeadExpr(ArrayList JavaDoc<Expr> varList)
48   {
49     _varList = new Expr[varList.size()];
50     varList.toArray(_varList);
51
52     _keyList = new Value[varList.size()];
53
54     for (int i = 0; i < varList.size(); i++)
55       _keyList[i] = new LongValue(i);
56   }
57
58   public Expr []getVarList()
59   {
60     return _varList;
61   }
62
63   /**
64    * Evaluates the expression.
65    *
66    * @param env the calling environment.
67    *
68    * @return the expression value.
69    */
70   public Value eval(Env env)
71   {
72     throw new UnsupportedOperationException JavaDoc();
73   }
74
75   /**
76    * Evaluates the expression.
77    *
78    * @param env the calling environment.
79    *
80    * @return the expression value.
81    */
82   public void evalAssign(Env env, Value value)
83   {
84     int len = _varList.length;
85
86     for (int i = 0; i < len; i++) {
87       if (_varList[i] != null)
88         _varList[i].evalAssign(env, value.get(_keyList[i]).copy());
89     }
90   }
91 }
92
93
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