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Java > Open Source Codes > org > xquark > extractor > progress > 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.progress.sql;
24
25
26 import org.xquark.extractor.sql.Context;
27 import org.xquark.extractor.sql.SqlExpression;
28
29 public class SqlUnOpIsNull extends org.xquark.extractor.sql.SqlUnOpIsNull
30 {
31
32     private static final String JavaDoc RCSRevision = "$Revision: 1.4 $";
33     private static final String JavaDoc RCSName = "$Name: $";
34
35
36     public SqlUnOpIsNull() {
37     }
38
39     public SqlUnOpIsNull(SqlExpression expr, boolean notIsNull) {
40         super(expr, notIsNull);
41     }
42     public String JavaDoc toSql(Context context)
43     {
44         //Trace.enter(this,"toSql(Context context)");
45
46         StringBuffer JavaDoc retVal = new StringBuffer JavaDoc();
47         retVal.append(getOperand().toSql(context));
48         if ( getNot() )
49         {
50             retVal.append(" IS NOT NULL");
51         }
52         else
53         {
54             retVal.append(" IS NULL");
55         }
56
57         //Trace.exit(this,"toSql(Context context)");
58 return retVal.toString();
59     }
60 }
61
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