001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.3_testing/src/org/deegree/io/datastore/idgenerator/UUIDGenerator.java $
002    /*----------------------------------------------------------------------------
003     This file is part of deegree, http://deegree.org/
004     Copyright (C) 2001-2009 by:
005       Department of Geography, University of Bonn
006     and
007       lat/lon GmbH
008    
009     This library is free software; you can redistribute it and/or modify it under
010     the terms of the GNU Lesser General Public License as published by the Free
011     Software Foundation; either version 2.1 of the License, or (at your option)
012     any later version.
013     This library is distributed in the hope that it will be useful, but WITHOUT
014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016     details.
017     You should have received a copy of the GNU Lesser General Public License
018     along with this library; if not, write to the Free Software Foundation, Inc.,
019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020    
021     Contact information:
022    
023     lat/lon GmbH
024     Aennchenstr. 19, 53177 Bonn
025     Germany
026     http://lat-lon.de/
027    
028     Department of Geography, University of Bonn
029     Prof. Dr. Klaus Greve
030     Postfach 1147, 53001 Bonn
031     Germany
032     http://www.geographie.uni-bonn.de/deegree/
033    
034     e-mail: info@deegree.org
035    ----------------------------------------------------------------------------*/
036    package org.deegree.io.datastore.idgenerator;
037    
038    import java.util.Properties;
039    import java.util.UUID;
040    
041    import org.deegree.datatypes.Types;
042    import org.deegree.io.datastore.DatastoreTransaction;
043    import org.deegree.io.datastore.FeatureId;
044    import org.deegree.io.datastore.schema.MappedFeatureType;
045    import org.deegree.io.datastore.schema.MappedGMLId;
046    
047    /**
048     * Primary key and {@link FeatureId} generator that is based on UUIDs.
049     *
050     * @author <a href="mailto:schneider@lat-lon.de">Markus Schneider </a>
051     * @author last edited by: $Author: mschneider $
052     *
053     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
054     */
055    public class UUIDGenerator extends IdGenerator {
056    
057        private long mac;
058    
059        private boolean macSet;
060    
061        /**
062         * Creates a new <code>UUIDGenerator</code> instance.
063         * <p>
064         * Supported configuration parameters: <table>
065         * <tr>
066         * <th>Name</th>
067         * <th>optional?</th>
068         * <th>Usage</th>
069         * </tr>
070         * <tr>
071         * <td>macAddress</td>
072         * <td>yes</td>
073         * <td>specify MAC address component of UUID</td>
074         * </tr>
075         * </table>
076         *
077         * @param params
078         *            configuration parameters
079         * @throws IdGenerationException
080         */
081        public UUIDGenerator( Properties params ) throws IdGenerationException {
082            super( params );
083            String macAddress = params.getProperty( "macAddress" );
084            if ( macAddress != null ) {
085                long decoded;
086                try {
087                    decoded = Long.decode( macAddress );
088                } catch ( NumberFormatException e ) {
089                    throw new IdGenerationException( "Value for parameter 'macAddress': '" + macAddress
090                                                     + "' can not be decoded as Long." );
091                }
092                mac = decoded;
093                macSet = true;
094            }
095        }
096    
097        /**
098         * Returns a new primary key.
099         *
100         * @param ta
101         *            datastore transaction (context)
102         * @return a new primary key.
103         * @throws IdGenerationException
104         *             if the generation of the id could not be performed
105         */
106        @Override
107        public String getNewId( DatastoreTransaction ta )
108                                throws IdGenerationException {
109            return "UUID_" + ( macSet ? new UUID( mac, (long) ( Math.random() * Long.MAX_VALUE ) ) : UUID.randomUUID() );
110        }
111    
112        /**
113         * Returns a new id for a feature of the given type.
114         *
115         * @param ft
116         *            (mapped) feature type (irrelevant for this generator)
117         * @param ta
118         *            datastore transaction (context)
119         * @return a new feature id.
120         * @throws IdGenerationException
121         */
122        @Override
123        public FeatureId getNewId( MappedFeatureType ft, DatastoreTransaction ta )
124                                throws IdGenerationException {
125    
126            FeatureId fid = null;
127    
128            MappedGMLId fidDefinition = ft.getGMLId();
129            if ( fidDefinition.getKeySize() != 1 ) {
130                throw new IdGenerationException( "Cannot generate feature ids that are mapped to "
131                                                 + fidDefinition.getKeySize() + " columns." );
132            }
133            if ( fidDefinition.getIdFields()[0].getType() == Types.VARCHAR
134                 || fidDefinition.getIdFields()[0].getType() == Types.CHAR ) {
135                String uuidString = "UUID_"
136                                    + ( macSet ? new UUID( mac, (long) ( Math.random() * Long.MAX_VALUE ) )
137                                              : UUID.randomUUID() );
138                fid = new FeatureId( ft, new Object[] { uuidString } );
139            } else {
140                // TODO add handling of NUMERIC columns (>= 128 bit)
141                throw new IdGenerationException( "UUIDGenerator may currently only be used for VARCHAR fields." );
142            }
143            return fid;
144        }
145    }