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


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 import org.xquark.xml.xdbc.XMLDBCException;
27
28 public class FakeResultSet extends ResultSet {
29     // **********************************************************************
30 // * VERSIONING
31 // **********************************************************************
32 private static final String JavaDoc RCSRevision = "$Revision: 1.3 $";
33     private static final String JavaDoc RCSName = "$Name: $";
34     
35     private boolean first = true;
36     // ***********************************************************************
37 // * INITIALIZATION
38 // ***********************************************************************
39 /**
40      *
41      */
42     public FakeResultSet(Operator algebra, DynamicContext context) throws XMLDBCException {
43         super(algebra, context);
44         first = true;
45     }
46             
47     /**
48      * Fill the buffer buftuples with tuple.
49      *
50      * @param non_blocking if the evaluation is blocking, we must
51      * generate all the results before passing.
52      */
53     protected void evaluate(boolean non_blocking) throws MediatorException {}
54
55     /**
56      * Returns true if the result set has more elements.
57      * @return true if the result set has more elements, false otherwise
58      */
59     public boolean hasNext() throws MediatorException {
60         if (first) {
61             first = false;
62             return true;
63         }
64         return false;
65     }
66
67 }
68
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