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Java > Open Source Codes > org > xquark > mapper > storage > QueryExtraDataExplorer


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.mapper.storage;
24
25 import java.sql.SQLException JavaDoc;
26
27 import org.xquark.mapper.dbms.TableInfo;
28
29 /**
30  * Object used to perform XML structure node storage.
31  *
32  */
33 public abstract class QueryExtraDataExplorer extends ExtraDataExplorer
34 {
35     private static final String JavaDoc RCSRevision = "$Revision: 1.1 $";
36     private static final String JavaDoc RCSName = "$Name: $";
37     
38     protected int currentSubPathIndex = -2;
39     protected int subPathIndex = -1;
40     protected boolean currentResultExhausted = true;
41     
42     public QueryExtraDataExplorer(TableInfo tableInfo)
43     {
44         super(tableInfo);
45     }
46     
47     void freezeCurrentSubPath()
48     {
49         currentSubPathIndex++;
50         updateResultSegmentationFlag();
51     }
52     
53     public void reset() throws SQLException JavaDoc
54     {
55         super.reset();
56         currentSubPathIndex = -2;
57         subPathIndex = -1;
58         currentResultExhausted = true;
59     }
60     
61     public short getPath()
62     {
63         if (resultActive())
64             return super.getPath();
65         else
66             return -2;
67     }
68     
69     public long getUOID()
70     {
71         if (resultActive())
72             return super.getUOID();
73         else
74             return -1;
75     }
76     
77     protected void updateResultSegmentationFlag()
78     {
79         currentResultExhausted = (currentSubPathIndex != subPathIndex);
80     }
81     
82     boolean resultActive()
83     {
84         return notExhausted && !currentResultExhausted;
85     }
86 }
87
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