KickJava   Java API By Example, From Geeks To Geeks.

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


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.StringValue;
34 import com.caucho.quercus.env.Value;
35
36 /**
37  * Represents a PHP append ('.') expression.
38  */

39 public class AppendExpr extends Expr
40 {
41   private final Expr _value;
42   private AppendExpr _next;
43
44   protected AppendExpr(Expr value, AppendExpr next)
45   {
46     _value = value;
47     _next = next;
48   }
49
50   /**
51    * Returns the value expression.
52    */

53   public Expr getValue()
54   {
55     return _value;
56   }
57
58   /**
59    * Returns the next value in the append chain.
60    */

61   public AppendExpr getNext()
62   {
63     return _next;
64   }
65
66   /**
67    * Returns the next value in the append chain.
68    */

69   void setNext(AppendExpr next)
70   {
71     _next = next;
72   }
73
74   /**
75    * Returns true for a string.
76    */

77   public boolean isString()
78   {
79     return true;
80   }
81
82   @Override JavaDoc
83   public Value eval(Env env)
84   {
85     StringValue sb = _value.eval(env).toStringBuilder();
86
87     for (AppendExpr ptr = _next; ptr != null; ptr = ptr._next) {
88       sb = sb.append(ptr._value.eval(env));
89     }
90
91     return sb;
92   }
93
94   @Override JavaDoc
95   public String JavaDoc evalString(Env env)
96   {
97     StringValue sb = _value.eval(env).toStringBuilder();
98
99     for (AppendExpr ptr = _next; ptr != null; ptr = ptr._next) {
100       sb = sb.append(ptr._value.eval(env));
101     }
102
103     return sb.toString();
104   }
105
106   public String JavaDoc toString()
107   {
108     if (_next != null)
109       return "(" + _value + " . " + _next + ")";
110     else
111       return String.valueOf(_value);
112   }
113 }
114
115
Popular Tags