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


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 import org.xquark.extractor.common.Debug;
26
27 /**
28  * For Oracle-style outer join predicate specification ( (+)= in the where clause)
29  */
30 public class SqlOuterJoinPredicate extends SqlExpression
31 {
32     private static final String JavaDoc RCSRevision = "$Revision: 1.4 $";
33     private static final String JavaDoc RCSName = "$Name: $";
34
35     private SqlExpression _predicate;
36     protected SqlRenameRelation _innerTable;
37
38     /**
39     @param predicate
40     @param nullGenerateTable
41     @param outerTable
42     @roseuid 3BD177F80226
43      */
44     public SqlOuterJoinPredicate(SqlExpression predicate, SqlRenameRelation innerTable)
45     {
46         setPredicate (predicate);
47         setInnerTable (innerTable);
48     }
49
50     /**
51     @param predicate
52     @param nullGenerateTable
53     @roseuid 3BD177F801F4
54      */
55     public SqlOuterJoinPredicate() {
56     }
57
58     /**
59     Access method for the _predicate property.
60
61     @return the current value of the _predicate property
62      */
63     public SqlExpression getPredicate()
64     {
65       return _predicate;
66     }
67
68     /**
69     Sets the value of the _predicate property.
70
71     @param aPredicate the new value of the _predicate property
72      */
73     public void setPredicate(SqlExpression aPredicate)
74     {
75         Debug.assertTrue(null!=aPredicate,"null!=aPredicate");
76         _predicate = aPredicate;
77     }
78
79     public SqlRenameRelation getInnerTable()
80     {
81         return _innerTable;
82     }
83
84     public void setInnerTable(SqlRenameRelation innerTable)
85     {
86         Debug.assertTrue(null != innerTable, "null != innerTable");
87         _innerTable = innerTable;
88     }
89
90     public String JavaDoc toSql(Context context)
91     {
92         //Trace.enter(this,"toSql(Context context)");
93 context.outerJoinPredicate = true;
94         context.innerTable = getInnerTable();
95
96         String JavaDoc retVal = getPredicate().toSql(context);
97
98         context.outerJoinPredicate = false;
99         context.innerTable = null;
100
101         //Trace.exit(this,"toSql(Context context)");
102 return retVal;
103     }
104 }
105
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