/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.data.jdbc.attributeio;
import java.io.IOException;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import org.geotools.data.DataSourceException;
import org.geotools.factory.Hints;
import com.vividsolutions.jts.geom.CoordinateSequenceFactory;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.PrecisionModel;
import com.vividsolutions.jts.geom.impl.CoordinateArraySequenceFactory;
import com.vividsolutions.jts.io.InStream;
import com.vividsolutions.jts.io.WKBReader;
import com.vividsolutions.jts.io.WKBWriter;
/**
* An attribute IO implementation that can manage the WKB
*
* @author Andrea Aime
* @source $URL$
* @since 2.4.1
* @deprecated scheduled for removal in 2.7, use classes in org.geotools.jdbc
*/
public class WKBAttributeIO implements AttributeIO {
WKBReader wkbr;
ByteArrayInStream inStream = new ByteArrayInStream();
public WKBAttributeIO() {
wkbr = new WKBReader();
}
public WKBAttributeIO(Hints hints) {
// setup the geometry factory according to the hints
GeometryFactory gf = (GeometryFactory) hints.get(Hints.JTS_GEOMETRY_FACTORY);
if(gf == null) {
PrecisionModel pm = (PrecisionModel) hints.get(Hints.JTS_PRECISION_MODEL);
if(pm == null)
pm = new PrecisionModel();
Integer SRID = (Integer) hints.get(Hints.JTS_SRID);
int srid = SRID == null ? 0 : SRID.intValue();
CoordinateSequenceFactory csFactory = (CoordinateSequenceFactory) hints.get(Hints.JTS_COORDINATE_SEQUENCE_FACTORY);
if(csFactory == null)
csFactory = CoordinateArraySequenceFactory.instance();
gf = new GeometryFactory(pm, srid, csFactory);
}
wkbr = new WKBReader(gf);
}
/**
* This method will convert a Well Known Binary representation to a
* JTS Geometry object.
*
* @param wkb te wkb encoded byte array
*
* @return a JTS Geometry object that is equivalent to the WTB
* representation passed in by param wkb
*
* @throws IOException if more than one geometry object was found in the
* WTB representation, or if the parser could not parse the WKB
* representation.
*/
private Geometry WKB2Geometry(byte[] wkbBytes)
throws IOException {
// convert the byte[] to a JTS Geometry object
if (wkbBytes == null) //DJB: null value from database --> null geometry (the same behavior as WKT). NOTE: sending back a GEOMETRYCOLLECTION(EMPTY) is also a possibility, but this is not the same as NULL
return null;
try {
inStream.setBytes(wkbBytes);
return wkbr.read(inStream);
} catch (Exception e) {
throw new DataSourceException("An exception occurred while parsing WKB data", e);
}
}
/**
* @see org.geotools.data.jdbc.attributeio.AttributeIO#read(java.sql.ResultSet,
* int)
*/
public Object read(ResultSet rs, int position) throws IOException {
try {
byte bytes[] = rs.getBytes(position);
if (bytes == null) // ie. its a null column -> return a null geometry!
return null;
return WKB2Geometry(bytes);
} catch (SQLException e) {
throw new DataSourceException("SQL exception occurred while reading the geometry.", e);
}
}
/**
* Unsupported, will throw an UnsupportedOperationException
* @see org.geotools.data.jdbc.attributeio.AttributeIO#write(java.sql.ResultSet,
* int, java.lang.Object)
*/
public void write(ResultSet rs, int position, Object value)
throws IOException {
try {
if(value == null) {
rs.updateNull(position);
} else {
rs.updateBytes( position, new WKBWriter().write( (Geometry)value ));
}
} catch (SQLException e) {
throw new DataSourceException("SQL exception occurred while reading the geometry.", e);
}
}
/**
* @see org.geotools.data.jdbc.attributeio.AttributeIO#write(java.sql.PreparedStatement, int, java.lang.Object)
*/
public void write(PreparedStatement ps, int position, Object value) throws IOException {
try {
if(value == null) {
ps.setNull(position, Types.OTHER);
} else {
ps.setBytes( position, new WKBWriter().write( (Geometry)value ));
}
} catch (SQLException e) {
throw new DataSourceException("SQL exception occurred while reading the geometry.", e);
}
}
/**
* Accelerates data loading compared to the plain InStream shipped along with JTS
* @author Andrea Aime - TOPP
*
*/
private static class ByteArrayInStream implements InStream {
byte[] buffer;
int position;
public void setBytes(final byte[] buffer) {
this.buffer = buffer;
this.position = 0;
}
public void read(final byte[] buf) throws IOException {
final int size = buf.length;
System.arraycopy(buffer, position, buf, 0, size);
position += size;
}
}
}