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Java > Open Source Codes > com > caucho > amber > query > ConcatExpr


1 /*
2  * Copyright (c) 1998-2004 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  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.amber.query;
30
31 import com.caucho.util.CharBuffer;
32
33 /**
34  * String concatenation expression.
35  */
36 class ConcatExpr extends AbstractAmberExpr {
37   private AmberExpr _left;
38   private AmberExpr _right;
39
40   /**
41    * Creates a new cmp expression
42    */
43   ConcatExpr(AmberExpr left, AmberExpr right)
44   {
45     _left = left;
46     _right = right;
47   }
48
49   /**
50    * Returns the java type.
51    */
52   public Class getJavaType()
53   {
54     return String.class;
55   }
56
57   /**
58    * Binds the expression as a select item.
59    */
60   public AmberExpr bindSelect(QueryParser parser)
61   {
62     _left = _left.bindSelect(parser);
63     _right = _right.bindSelect(parser);
64
65     return this;
66   }
67   
68   /**
69    * Generates the where expression.
70    */
71   public void generateWhere(CharBuffer cb)
72   {
73     cb.append('(');
74     _left.generateWhere(cb);
75     cb.append(" || ");
76     _right.generateWhere(cb);
77     cb.append(')');
78   }
79
80   public String toString()
81   {
82     return "(" + _left + " || " + _right + ")";
83   }
84 }
85
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