KickJava   Java API By Example, From Geeks To Geeks.

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


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.LongValue;
35 import com.caucho.quercus.env.Value;
36
37 /**
38  * Represents a PHP expression.
39  */
40 abstract public class LongValuedExpr extends Expr {
41   public LongValuedExpr(Location location)
42   {
43     super(location);
44   }
45
46   public LongValuedExpr()
47   {
48   }
49
50   /**
51    * Evaluates the expression as a value.
52    *
53    * @param env the calling environment.
54    *
55    * @return the expression value.
56    */
57   public Value eval(Env env)
58   {
59     return new LongValue(evalLong(env));
60   }
61
62   /**
63    * Evaluates the expression as a boolean.
64    *
65    * @param env the calling environment.
66    *
67    * @return the expression value.
68    */
69   public boolean evalBoolean(Env env)
70   {
71     return evalLong(env) != 0;
72   }
73
74   /**
75    * Evaluates the expression as double
76    *
77    * @param env the calling environment.
78    *
79    * @return the expression value.
80    */
81   public double evalDouble(Env env)
82   {
83     return evalLong(env);
84   }
85
86   /**
87    * Evaluates the expression as a long.
88    *
89    * @param env the calling environment.
90    *
91    * @return the expression value.
92    */
93   abstract public long evalLong(Env env);
94 }
95
96
Popular Tags