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


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 /*
24  * DocumentGenerator.java
25  *
26  * Created on 12 mars 2001, 18:01
27  */
28
29 package org.xquark.mapper.storage;
30
31 import java.sql.SQLException JavaDoc;
32
33 import org.xquark.mapper.RepositoryException;
34 import org.xquark.xml.xdbc.XMLDBCException;
35
36 /**
37  *
38  *
39  * <p>Generation is guided by the schema and indecisions are removed by
40  * document instance information (stored in the structure table).</p>
41  * @see org.xquark.mapper.XMLCollection
42  */
43 public class InteractiveQueryBuilder extends QueryBuilder
44 {
45     private static final String JavaDoc RCSRevision = "$Revision: 1.1 $";
46     private static final String JavaDoc RCSName = "$Name: $";
47     
48     /** To be used by query reconstruction */
49     public InteractiveQueryBuilder(_RepositoryCollection collection, VarInfoSet varInfo) throws XMLDBCException
50     {
51         super(collection, varInfo);
52         try
53         {
54             /* Preparing database queries */
55             tuplePool = qTuplePool = new InteractiveQueryExplorer(collection);
56             // prepare statements
57 qTuplePool.initExploration(varInfo, collection.getRepositoryConnection().getConnection());
58         }
59         catch (SQLException JavaDoc e)
60         {
61             throw new RepositoryException(RepositoryException.DB_ERROR, "JDBC error while initializing tuple explorer.");
62         }
63     }
64     
65     protected void initNewResult(int rank) throws XMLDBCException
66     {
67         try
68         {
69             qTuplePool.reset();
70             
71             // execute prepared statement (who handles break ?)
72 ((InteractiveQueryExplorer)qTuplePool).execQuery(varFirst, varLast, currentPath);
73             
74             // initiate row lookup
75 qTuplePool.lookup();
76         }
77         catch (SQLException JavaDoc e)
78         {
79             throw new RepositoryException(RepositoryException.DB_ERROR,
80             "Database error while performing reconstruction query", e);
81         }
82     }
83 }
84
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