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Java > Open Source Codes > org > xquark > extractor > algebra > TempTable


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.algebra;
24
25 import java.util.List JavaDoc;
26
27 import org.xquark.extractor.common.SqlWrapperException;
28 import org.xquark.extractor.sql.SqlExpression;
29
30 /**
31  *
32  * A Temporary table used for intermediate result storage. This object may be
33  * created with or without table specification. If missing table specification
34  * will be deduced from operand relation.
35  *
36  * NOTE: Not used up to now : the problem is fixed during generation.
37  */
38
39 // TODO: Reset temp table counter at every query (No drop needed 4 MySQL but a least a truncate)
40 // TODO: Remove ?
41 public final class TempTable extends UnaryAlgebra
42 {
43
44     private static final String JavaDoc RCSRevision = "$Revision: 1.3 $";
45     private static final String JavaDoc RCSName = "$Name: $";
46
47     protected org.xquark.extractor.metadata.Table _table;
48
49
50     public TempTable(org.xquark.extractor.metadata.Table mTable) {
51         _table = mTable;
52     }
53     
54     public TempTable(String JavaDoc name) {
55         // TODO: build a metadata object from the operand: not necessary for DBMS
56 // supporting CREATE TABLE AS... But not so easy to realize: should add a
57 // method to Relation interface to retrieve item list
58 this(new org.xquark.extractor.metadata.Table(name));
59     }
60
61     public SqlExpression accept (GenSqlVisitor visitor) throws SqlWrapperException
62     {
63         return visitor.visit(this);
64     }
65
66     public void accept (AlgebraVisitor visitor) throws SqlWrapperException
67     {
68         visitor.visit(this);
69     }
70
71     public String JavaDoc getName()
72     {
73         return _table.getName();
74     }
75
76     public List JavaDoc getKeys() {
77         return _keys;
78     }
79 }
80
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