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


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 import org.xquark.mapper.metadata.UOIDManager;
29
30 /**
31  * Object used to perform XML structure node storage.
32  *
33  */
34 public abstract class QueryStructExplorer extends StructExplorer
35 {
36     private static final String JavaDoc RCSRevision = "$Revision: 1.1 $";
37     private static final String JavaDoc RCSName = "$Name: $";
38
39     protected boolean currentResultExhausted = true;
40     protected int currentSubPathIndex = -2;
41     protected int subPathIndex = -1;
42     
43     public QueryStructExplorer(TableInfo tableInfo, UOIDManager manager)
44     {
45         super(tableInfo, manager);
46     }
47     
48     public short getPath()
49     {
50         if (resultActive())
51             return super.getPath();
52         else
53             return -2;
54     }
55     
56     public long getUOID()
57     {
58         if (resultActive())
59             return super.getUOID();
60         else
61             return -1;
62     }
63     
64     void freezeCurrentSubPath()
65     {
66         currentSubPathIndex++;
67         updateResultSegmentationFlag();
68     }
69
70     public void reset() throws SQLException JavaDoc
71     {
72         super.reset();
73         currentSubPathIndex = -2;
74         subPathIndex = -1;
75         currentResultExhausted = true;
76     }
77     
78     protected void updateResultSegmentationFlag()
79     {
80         currentResultExhausted = (currentSubPathIndex != subPathIndex);
81     }
82     
83     boolean resultActive()
84     {
85         return notExhausted && !currentResultExhausted;
86     }
87 }
88
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