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Java > Open Source Codes > org > xquark > mediator > plan > ZeroResultSet


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.mediator.plan ;
24
25 import org.xquark.mediator.runtime.MediatorException;
26
27 public abstract class ZeroResultSet extends ResultSet {
28     // **********************************************************************
29 // * VERSIONING
30 // **********************************************************************
31 private static final String JavaDoc RCSRevision = "$Revision: 1.5 $";
32     private static final String JavaDoc RCSName = "$Name: $";
33     // ***********************************************************************
34 // * INITIALIZATION
35 // ***********************************************************************
36 /**
37      *
38      */
39     public ZeroResultSet(ZeroOp operator, DynamicContext context) throws MediatorException {
40         super(operator, context) ;
41         // if it is a leaf (for AlgSource)
42 if ((operator == null)) return ;
43     }
44             
45     /** Fill the buffer buftuples with tuple.
46      *
47      * @param non_blocking if the evaluation is blocking, we must
48      * generate all the results before passing.
49      */
50     protected void evaluate(boolean non_blocking) throws MediatorException {
51     }
52     
53 }
54
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