Source Code Cross Referenced for FIDSequence.java in  » GIS » GeoTools-2.4.1 » org » geotools » data » oracle » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.data.oracle 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2002-2006, Geotools Project Managment Committee (PMC)
005:         *
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation; either
009:         *    version 2.1 of the License, or (at your option) any later version.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         */
016:        package org.geotools.data.oracle;
017:
018:        import java.sql.Connection;
019:        import java.sql.ResultSet;
020:        import java.sql.SQLException;
021:        import java.sql.Statement;
022:
023:        import org.geotools.data.DataSourceException;
024:
025:        /**
026:         * Provides a sequence for generating unique FID keys.  Selects the max value of the fid column
027:         * then increments it with each successive call to getNext().
028:         * 
029:         * <p>
030:         * This may break if other tools are modifying the database at the same time. But this is a wider
031:         * issue that should be dealt with in a Geotools standard way.  When that way is determined this
032:         * class can probably disappear. This is also part of the reason why this class is only package
033:         * visible, since this method of generating fids should not be used by other data sources.
034:         * </p>
035:         *
036:         * @author Sean Geoghegan, Defence Science and Technology Organisation
037:         * @author $Author: seangeo $
038:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/unsupported/oracle-spatial/src/main/java/org/geotools/data/oracle/FIDSequence.java $
039:         * @version $Id: FIDSequence.java 20886 2006-08-07 15:30:17Z jgarnett $
040:         *
041:         * @task REVISIT: This assumes that the DB does not manage the PK itself.  I need to work out a way
042:         *       to check that is does and then defer to the DB in that case.
043:         */
044:        class FIDSequence {
045:            /** Holds the current FID.  THis is incremented for each getNext() call */
046:            private int current;
047:
048:            /**
049:             * Creates a FID sequence that generates unique FID keys for adding features to the table.
050:             *
051:             * @param conn The Database Connection
052:             * @param tablename The table
053:             * @param fidColumn The FID column
054:             *
055:             * @throws DataSourceException If an error occurs determining the max fid.
056:             */
057:            FIDSequence(Connection conn, String tablename, String fidColumn)
058:                    throws DataSourceException {
059:                ResultSet resultSet = null;
060:
061:                try {
062:                    String query = "SELECT max(" + fidColumn + ") FROM "
063:                            + tablename;
064:
065:                    Statement statement = conn.createStatement();
066:
067:                    resultSet = statement.executeQuery(query);
068:
069:                    if (resultSet.next()) {
070:                        Number number = (Number) resultSet.getObject(1);
071:
072:                        current = number.intValue();
073:                    } else {
074:                        throw new DataSourceException("Could not get max for "
075:                                + fidColumn);
076:                    }
077:                } catch (SQLException e) {
078:                    throw new DataSourceException("SQL Error occured when "
079:                            + "generating unique key", e);
080:                } catch (ClassCastException e) {
081:                    throw new DataSourceException("Error casting fid column "
082:                            + "to a number", e);
083:                } finally {
084:                    try {
085:                        if (resultSet != null) {
086:                            resultSet.close();
087:                        }
088:                    } catch (SQLException e1) {
089:                        // dont need to do anything here - just closing the result set
090:                    }
091:                }
092:            }
093:
094:            /**
095:             * Gets the next unique FID key.
096:             *
097:             * @return The next key in the sequence.
098:             */
099:            int getNext() {
100:                current += 1;
101:
102:                return current;
103:            }
104:        }
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