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


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  * Bound identifier expression.
35  */
36 class LikeExpr extends AbstractAmberExpr {
37   private AmberExpr _expr;
38   
39   private AmberExpr _value;
40   private String _escape;
41   private boolean _isNot;
42
43   /**
44    * Creates a new cmp expression
45    */
46   LikeExpr(AmberExpr expr, AmberExpr value, String escape, boolean isNot)
47   {
48     _expr = expr;
49     _value = value;
50     _isNot = isNot;
51     _escape = escape;
52   }
53
54   /**
55    * Binds the expression as a select item.
56    */
57   public AmberExpr bindSelect(QueryParser parser)
58   {
59     _expr = _expr.bindSelect(parser);
60     _value = _value.bindSelect(parser);
61
62     return this;
63   }
64
65   /**
66    * Returns true if the expression uses the from item.
67    */
68   public boolean usesFrom(FromItem from, int type, boolean isNot)
69   {
70     return (_expr.usesFrom(from, type));
71   }
72
73   /**
74    * Returns true if the expression uses the from item.
75    */
76   public AmberExpr replaceJoin(JoinExpr join)
77   {
78     _expr = _expr.replaceJoin(join);
79     _value = _value.replaceJoin(join);
80     
81     return this;
82   }
83   
84   /**
85    * Generates the where expression.
86    */
87   public void generateWhere(CharBuffer cb)
88   {
89     cb.append('(');
90     _expr.generateWhere(cb);
91
92     if (_isNot)
93       cb.append(" NOT");
94
95     cb.append(" LIKE ");
96
97     _value.generateWhere(cb);
98
99     if (_escape != null) {
100       cb.append(" ESCAPE ");
101       cb.append(_escape);
102     }
103     
104     cb.append(')');
105   }
106
107   public String toString()
108   {
109     CharBuffer cb = CharBuffer.allocate();
110     
111     cb.append('(');
112     cb.append(_expr);
113
114     if (_isNot)
115       cb.append(" NOT");
116
117     cb.append(" LIKE ");
118
119     cb.append(_value);
120     
121     cb.append(')');
122
123     return cb.close();
124   }
125 }
126
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