001 //$HeadURL: svn+ssh://rbezema@svn.wald.intevation.org/deegree/base/branches/2.2_testing/src/org/deegree/io/IDGeneratorFactory.java $
002 /*---------------- FILE HEADER ------------------------------------------
003
004 This file is part of deegree.
005 Copyright (C) 2001-2008 by:
006 EXSE, Department of Geography, University of Bonn
007 http://www.giub.uni-bonn.de/deegree/
008 lat/lon GmbH
009 http://www.lat-lon.de
010
011 This library is free software; you can redistribute it and/or
012 modify it under the terms of the GNU Lesser General Public
013 License as published by the Free Software Foundation; either
014 version 2.1 of the License, or (at your option) any later version.
015
016 This library is distributed in the hope that it will be useful,
017 but WITHOUT ANY WARRANTY; without even the implied warranty of
018 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
019 Lesser General Public License for more details.
020
021 You should have received a copy of the GNU Lesser General Public
022 License along with this library; if not, write to the Free Software
023 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
024
025 Contact:
026
027 Andreas Poth
028 lat/lon GmbH
029 Aennchenstr. 19
030 53115 Bonn
031 Germany
032 E-Mail: poth@lat-lon.de
033
034 Prof. Dr. Klaus Greve
035 Department of Geography
036 University of Bonn
037 Meckenheimer Allee 166
038 53115 Bonn
039 Germany
040 E-Mail: greve@giub.uni-bonn.de
041
042
043 ---------------------------------------------------------------------------*/
044 package org.deegree.io;
045
046 import java.sql.Connection;
047 import java.sql.DatabaseMetaData;
048 import java.sql.ResultSet;
049 import java.sql.ResultSetMetaData;
050 import java.sql.SQLException;
051 import java.sql.Statement;
052 import java.sql.Types;
053
054 import org.deegree.framework.log.ILogger;
055 import org.deegree.framework.log.LoggerFactory;
056 import org.deegree.framework.util.DataBaseIDGenerator;
057
058 /**
059 * Factory for <tt>IDGenerator</tt>-instances. The generated instance is suitable for the
060 * database used and for the configuration (i.e. table and field type).
061 * <p>
062 *
063 * @author <a href="mailto:mschneider@lat-lon.de">Markus Schneider</a>
064 * @version $Revision: 9342 $ $Date: 2007-12-27 13:32:57 +0100 (Do, 27 Dez 2007) $
065 */
066 public class IDGeneratorFactory {
067
068 private static final ILogger LOG = LoggerFactory.getLogger( IDGeneratorFactory.class );
069
070 public static DataBaseIDGenerator createIDGenerator( Connection con, String tableName, String fieldName )
071 throws SQLException {
072
073 // retrieve type of field
074 Statement stmt = con.createStatement();
075 ResultSet rs = stmt.executeQuery( "SELECT " + fieldName + " FROM " + tableName );
076 ResultSetMetaData rsmd = rs.getMetaData();
077 int type = rsmd.getColumnType( 1 );
078 rs.close();
079 stmt.close();
080 boolean isNumeric = false;
081
082 switch ( type ) {
083 case Types.INTEGER:
084 case Types.BIGINT:
085 case Types.DECIMAL:
086 case Types.NUMERIC:
087 case Types.SMALLINT:
088 case Types.TINYINT: {
089 isNumeric = true;
090 break;
091 }
092 case Types.CHAR:
093 case Types.LONGVARCHAR:
094 case Types.VARCHAR: {
095 isNumeric = false;
096 break;
097 }
098 default: {
099 throw new SQLException( "Cannot create DataBaseIDGenerator for table '" + tableName + "' and field '"
100 + fieldName + "'. Only integer and alphanumeric " + "fields are supported" );
101 }
102 }
103
104 // find suitable instance of IDGenerator
105 DatabaseMetaData dbmd = con.getMetaData();
106 String dbName = dbmd.getDatabaseProductName();
107 String dbVersion = dbmd.getDatabaseProductVersion();
108 String driverName = dbmd.getDriverName();
109 String driverVersion = dbmd.getDriverVersion();
110
111 LOG.logDebug( "dbName : " + dbName );
112 LOG.logDebug( "dbVersion : " + dbVersion );
113 LOG.logDebug( "driverName : " + driverName );
114 LOG.logDebug( "driverVersion: " + driverVersion );
115
116 DataBaseIDGenerator idGenerator = new GenericSQLIDGenerator( con, tableName, fieldName, type, isNumeric );
117 return idGenerator;
118 }
119 }