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


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.Env;
34 import com.caucho.quercus.env.RefVar;
35 import com.caucho.quercus.env.Value;
36 import com.caucho.quercus.env.Var;
37
38 /**
39  * Represents a PHP reference argument.
40  */
41 public class RefExpr extends UnaryExpr {
42   public RefExpr(Location location, Expr expr)
43   {
44     super(location, expr);
45   }
46
47   public RefExpr(Expr expr)
48   {
49     super(expr);
50   }
51
52   /**
53    * Returns true for a reference.
54    */
55   public boolean isRef()
56   {
57     return true;
58   }
59
60   /**
61    * Evaluates the expression.
62    *
63    * @param env the calling environment.
64    *
65    * @return the expression value.
66    */
67   public Value eval(Env env)
68   {
69     // quercus/0d28
70 Value value = getExpr().evalRef(env);
71
72     if (value instanceof Var)
73       return new RefVar((Var) value);
74     else
75       return value;
76   }
77
78   /**
79    * Evaluates the expression.
80    *
81    * @param env the calling environment.
82    *
83    * @return the expression value.
84    */
85   public Value evalRef(Env env)
86   {
87     Value value = getExpr().evalRef(env);
88
89     // php/112d
90 return value;
91     /*
92     if (value instanceof Var)
93       return new RefVar((Var) value);
94     else
95       return value;
96     */
97   }
98
99   public String JavaDoc toString()
100   {
101     return _expr.toString();
102   }
103 }
104
105
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