Source Code Cross Referenced for JDBCFeatureReader.java in  » GIS » GeoTools-2.4.1 » org » geotools » data » jdbc » 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.jdbc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2004-2006, 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;
009:         *    version 2.1 of the License.
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:         *    Created on 7-apr-2004
017:         */
018:        package org.geotools.data.jdbc;
019:
020:        import java.io.IOException;
021:        import java.sql.SQLException;
022:
023:        import org.geotools.data.FeatureReader;
024:        import org.geotools.data.jdbc.fidmapper.FIDMapper;
025:        import org.geotools.feature.Feature;
026:        import org.geotools.feature.FeatureType;
027:        import org.geotools.feature.GeometryAttributeType;
028:        import org.geotools.feature.IllegalAttributeException;
029:
030:        import com.vividsolutions.jts.geom.Geometry;
031:
032:        /**
033:         * JDBCDataStore specific implementation of the FeatureReader interface
034:         *
035:         * @author aaime
036:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/jdbc/src/main/java/org/geotools/data/jdbc/JDBCFeatureReader.java $
037:         */
038:        public class JDBCFeatureReader implements  FeatureReader {
039:            FeatureType featureType;
040:            QueryData queryData;
041:            Object[] attributes;
042:            Object[] fidAttributes;
043:
044:            /**
045:             * Creates a new JDBCFeatureReader object.
046:             *
047:             * @param queryData 
048:             *
049:             * @throws IOException 
050:             */
051:            public JDBCFeatureReader(QueryData queryData) throws IOException {
052:                this .queryData = queryData;
053:                attributes = new Object[queryData.getAttributeHandlers().length];
054:                fidAttributes = new Object[queryData.getMapper()
055:                        .getColumnCount()];
056:            }
057:
058:            /**
059:             * @see org.geotools.data.FeatureReader#close()
060:             */
061:            public void close() throws IOException {
062:                close(null);
063:            }
064:
065:            void close(SQLException sqlException) {
066:                queryData.close(sqlException);
067:            }
068:
069:            /**
070:             * @see org.geotools.data.FeatureReader#hasNext()
071:             */
072:            public boolean hasNext() throws IOException {
073:                if (queryData.isClosed()) {
074:                    throw new IOException("Reader is closed");
075:                }
076:
077:                return queryData.hasNext();
078:            }
079:
080:            /**
081:             * @see org.geotools.data.FeatureReader#next()
082:             */
083:            public Feature next() throws IllegalAttributeException, IOException {
084:                if (queryData.isClosed()) {
085:                    throw new IOException("The feature reader has been closed");
086:                }
087:
088:                return readFeature();
089:            }
090:
091:            /**
092:             * Really reads the feature from the QueryData object
093:             * @throws IllegalAttributeException
094:             * @throws IOException
095:             */
096:            private Feature readFeature() throws IllegalAttributeException,
097:                    IOException {
098:                queryData.next();
099:
100:                for (int i = 0; i < fidAttributes.length; i++) {
101:                    fidAttributes[i] = queryData.readFidColumn(i);
102:                }
103:
104:                FIDMapper mapper = queryData.getMapper();
105:                String fid = mapper.getID(fidAttributes);
106:
107:                for (int i = 0; i < attributes.length; i++) {
108:                    Object attribute = queryData.read(i);
109:
110:                    //JD: check for a coordinate system, if present on the type, set on the geometry
111:                    // I know this is pretty loose, but its better then nothing
112:                    if (attribute instanceof  Geometry
113:                            && queryData.getFeatureType().getAttributeType(i) instanceof  GeometryAttributeType) {
114:                        Geometry geometry = (Geometry) attribute;
115:                        GeometryAttributeType geometryType = (GeometryAttributeType) queryData
116:                                .getFeatureType().getAttributeType(i);
117:
118:                        if (geometryType.getCoordinateSystem() != null) {
119:                            geometry.setUserData(geometryType
120:                                    .getCoordinateSystem());
121:                        }
122:                    }
123:
124:                    attributes[i] = attribute;
125:                }
126:
127:                return queryData.getFeatureType().create(attributes, fid);
128:            }
129:
130:            /**
131:             * @see org.geotools.data.FeatureReader#getFeatureType()
132:             */
133:            public FeatureType getFeatureType() {
134:                return queryData.getFeatureType();
135:            }
136:        }
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