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Java > Open Source Codes > com > mckoi > database > RootTable


1 /**
2  * com.mckoi.database.RootTable 22 Sep 2000
3  *
4  * Mckoi SQL Database ( http://www.mckoi.com/database )
5  * Copyright (C) 2000, 2001, 2002 Diehl and Associates, Inc.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * Version 2 as published by the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License Version 2 for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * Version 2 along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  *
20  * Change Log:
21  *
22  *
23  */
24
25 package com.mckoi.database;
26
27 /**
28  * Interface that is implemented by all Root tables. A Root table is a non-
29  * virtual table that represents table data in its lowest form. When the
30  * Table.resolveToRawTable method is called, if it encounters a table that
31  * implements RootTable then it does not attempt to decend further to
32  * extract the underlying tables.
33  * <p>
34  * This interface is used for unions.
35  *
36  * @author Tobias Downer
37  */
38
39 public interface RootTable {
40
41   /**
42    * This is function is used to check that two root tables are identical.
43    * This is used if we need to chect that the form of the table is the same.
44    * Such as in a union operation, when we can only union two tables with
45    * the identical columns.
46    */
47   boolean typeEquals(RootTable table);
48
49
50 }
51
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