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


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.Location;
33 import com.caucho.quercus.env.ArrayValue;
34 import com.caucho.quercus.env.ArrayValueImpl;
35 import com.caucho.quercus.env.Env;
36 import com.caucho.quercus.env.Value;
37
38 import java.util.ArrayList JavaDoc;
39
40 /**
41  * Represents the array function
42  */
43 public class ArrayFunExpr extends Expr {
44   protected final Expr []_keys;
45   protected final Expr []_values;
46
47   public ArrayFunExpr(Location location,
48               ArrayList JavaDoc<Expr> keyList,
49               ArrayList JavaDoc<Expr> valueList)
50   {
51     super(location);
52     _keys = new Expr[keyList.size()];
53     keyList.toArray(_keys);
54
55     _values = new Expr[valueList.size()];
56     valueList.toArray(_values);
57   }
58
59   public ArrayFunExpr(Location location, Expr []keys, Expr []values)
60   {
61     super(location);
62     _keys = keys;
63     _values = values;
64   }
65
66   public ArrayFunExpr(ArrayList JavaDoc<Expr> keyList, ArrayList JavaDoc<Expr> valueList)
67   {
68     this(Location.UNKNOWN, keyList, valueList);
69   }
70
71   public ArrayFunExpr(Expr []keys, Expr []values)
72   {
73     this(Location.UNKNOWN, keys, values);
74   }
75
76   /**
77    * Returns true for a constant array.
78    */
79   public boolean isConstant()
80   {
81     for (int i = 0; i < _keys.length; i++) {
82       if (_keys[i] != null && ! _keys[i].isLiteral())
83         return false;
84     }
85
86     for (int i = 0; i < _values.length; i++) {
87       if (_values[i] != null && ! _values[i].isLiteral())
88         return false;
89     }
90
91     return true;
92   }
93
94   /**
95    * Evaluates the expression.
96    *
97    * @param env the calling environment.
98    *
99    * @return the expression value.
100    */
101   public Value eval(Env env)
102   {
103     ArrayValue array = new ArrayValueImpl();
104
105     for (int i = 0; i < _values.length; i++) {
106       Expr keyExpr = _keys[i];
107       Value value = _values[i].evalArg(env);
108
109       value = value.toArgValue();
110
111       if (keyExpr != null) {
112         Value key = keyExpr.evalArg(env).toArgValue();
113
114         array.put(key, value);
115       }
116       else
117         array.put(value);
118     }
119
120     return array;
121   }
122
123   public String JavaDoc toString()
124   {
125     return "array()";
126   }
127 }
128
129
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