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


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 SqlUnOpExists 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 _notExists;
33
34     /**
35     @param query
36     @param notExists
37     @roseuid 3BD1780501E9
38      */
39     public SqlUnOpExists(SqlExpression query, boolean notExists)
40     {
41         super ( query ) ;
42         setNot ( notExists ) ;
43     }
44
45     /**
46     @param query
47     @roseuid 3BD17805012A
48      */
49     public SqlUnOpExists(SqlExpression query)
50     {
51         super ( query ) ;
52         setNot ( false ) ;
53     }
54
55     /**
56     @roseuid 3BD1780500F8
57      */
58     public SqlUnOpExists()
59     {
60
61     }
62
63     /**
64     @param notExists
65     @roseuid 3BD178050301
66      */
67     public void setNot(boolean notExists)
68     {
69         _notExists = notExists ;
70     }
71
72     /**
73     @return boolean
74     @roseuid 3BD178050397
75      */
76     public boolean getNot()
77     {
78         return _notExists ;
79     }
80
81     /**
82     @return String
83     @roseuid 3BD1780503D3
84      */
85     public String JavaDoc toSql(Context context)
86     {
87         //Trace.enter(this,"toSql(Context context)");
88
89         StringBuffer JavaDoc retVal = new StringBuffer JavaDoc();
90         if ( _notExists )
91         {
92             retVal.append("NOT EXISTS ( ");
93         }
94         else
95         {
96             retVal.append("EXISTS ( ");
97         }
98
99         retVal.append(getOperand().toSql(context));
100         retVal.append(" )");
101
102         //Trace.exit(this,"toSql(Context context)");
103 return retVal.toString();
104     }
105 }
106
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