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


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 StructExplorer extends StructPersistentNode
35 {
36     private static final String JavaDoc RCSRevision = "$Revision: 1.1 $";
37     private static final String JavaDoc RCSName = "$Name: $";
38     
39     protected boolean notExhausted = false;
40     
41     public StructExplorer(TableInfo tableInfo, UOIDManager manager)
42     {
43         super(tableInfo, manager);
44     }
45     
46     /**
47      * get the next row from database and store it in the current object.
48      */
49     public abstract boolean fetchNextRow() throws SQLException JavaDoc;
50     
51     boolean queryPending()
52     {
53         return notExhausted;
54     }
55     
56     /** To be overridden */
57     boolean resultActive()
58     {
59         return notExhausted;
60     }
61     
62     public void reset() throws SQLException JavaDoc
63     {
64         super.reset();
65         notExhausted = false;
66     }
67     
68     public boolean isInRange(long first, long last, short path)
69     {
70         return resultActive() && super.isInRange(first, last, path);
71     }
72     
73     public boolean isInRange(long first, long last)
74     {
75         return resultActive() && super.isInRange(first, last);
76     }
77 }
78
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