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Java > Open Source Codes > org > xquark > extractor > sql > SqlUnOpIsNull


1 /*
2  * This file belongs to the XQuark distribution.
3  * Copyright (C) 2003 Universite de Versailles Saint-Quentin.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307.
18  * You can also get it at http://www.gnu.org/licenses/lgpl.html
19  *
20  * For more information on this software, see http://www.xquark.org.
21  */
22
23 package org.xquark.extractor.sql;
24
25
26 public class SqlUnOpIsNull extends SqlUnaryOperator
27 {
28
29     private static final String JavaDoc RCSRevision = "$Revision: 1.4 $";
30     private static final String JavaDoc RCSName = "$Name: $";
31
32     private boolean _notNull;
33
34     public SqlUnOpIsNull() {
35     }
36
37     public SqlUnOpIsNull(SqlExpression operand, boolean notNull)
38     {
39         super ( operand ) ;
40         setNot ( notNull ) ;
41     }
42
43     public SqlUnOpIsNull(SqlExpression operand)
44     {
45         super ( operand ) ;
46         setNot ( false ) ;
47     }
48
49     public void setNot(boolean notNull)
50     {
51         _notNull = notNull ;
52     }
53
54     public boolean getNot()
55     {
56         return _notNull ;
57     }
58
59     public String JavaDoc toSql(Context context)
60     {
61         //Trace.enter(this,"toSql(Context context)");
62
63         StringBuffer JavaDoc retVal = new StringBuffer JavaDoc();
64         retVal.append("(");
65         retVal.append(getOperand().toSql(context));
66         retVal.append(")");
67
68         if ( _notNull )
69         {
70             retVal.append(" IS NOT NULL");
71         }
72         else
73         {
74             retVal.append(" IS NULL");
75         }
76
77         //Trace.exit(this,"toSql(Context context)");
78 return retVal.toString();
79     }
80 }
81
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