/*
* 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.shapefile.shp;
import java.nio.ByteBuffer;
import java.nio.DoubleBuffer;
import com.vividsolutions.jts.geom.CoordinateSequence;
import com.vividsolutions.jts.geom.CoordinateSequenceFactory;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.MultiLineString;
/*
* $Id$ @author
* aaime @author Ian Schneider
*/
/**
* The default JTS handler for shapefile. Currently uses the default JTS
* GeometryFactory, since it doesn't seem to matter.
*
*
*
* @source $URL$
*/
public class MultiLineHandler implements ShapeHandler {
final ShapeType shapeType;
GeometryFactory geometryFactory;
double[] xy;
double[] z;
/** Create a MultiLineHandler for ShapeType.ARC */
public MultiLineHandler(GeometryFactory gf) {
shapeType = ShapeType.ARC;
this.geometryFactory = gf;
}
/**
* Create a MultiLineHandler for one of: <br>
* ShapeType.ARC,ShapeType.ARCM,ShapeType.ARCZ
*
* @param type
* The ShapeType to use.
* @throws ShapefileException
* If the ShapeType is not correct (see constructor).
*/
public MultiLineHandler(ShapeType type, GeometryFactory gf) throws ShapefileException {
if ((type != ShapeType.ARC) && (type != ShapeType.ARCM)
&& (type != ShapeType.ARCZ)) {
throw new ShapefileException(
"MultiLineHandler constructor - expected type to be 3,13 or 23");
}
shapeType = type;
this.geometryFactory = gf;
}
/**
* Get the type of shape stored
* (ShapeType.ARC,ShapeType.ARCM,ShapeType.ARCZ)
*/
public ShapeType getShapeType() {
return shapeType;
}
/** */
public int getLength(Object geometry) {
MultiLineString multi = (MultiLineString) geometry;
int numlines;
int numpoints;
int length;
numlines = multi.getNumGeometries();
numpoints = multi.getNumPoints();
if (shapeType == ShapeType.ARC) {
length = 44 + (4 * numlines) + (numpoints * 16);
} else if (shapeType == ShapeType.ARCM) {
length = 44 + (4 * numlines) + (numpoints * 16) + 8 + 8
+ (8 * numpoints);
} else if (shapeType == ShapeType.ARCZ) {
length = 44 + (4 * numlines) + (numpoints * 16) + 8 + 8
+ (8 * numpoints) + 8 + 8 + (8 * numpoints);
} else {
throw new IllegalStateException("Expected ShapeType of Arc, got "
+ shapeType);
}
return length;
}
private Object createNull() {
return geometryFactory.createMultiLineString((LineString[]) null);
}
public Object read(ByteBuffer buffer, ShapeType type, boolean flatGeometry) {
if (type == ShapeType.NULL) {
return createNull();
}
int dimensions = (shapeType == ShapeType.ARCZ && !flatGeometry) ? 3 : 2;
// read bounding box (not needed)
buffer.position(buffer.position() + 4 * 8);
int numParts = buffer.getInt();
int numPoints = buffer.getInt(); // total number of points
int[] partOffsets = new int[numParts];
// points = new Coordinate[numPoints];
for (int i = 0; i < numParts; i++) {
partOffsets[i] = buffer.getInt();
}
// read the first two coordinates and start building the coordinate
// sequences
CoordinateSequence[] lines = new CoordinateSequence[numParts];
int finish, start = 0;
int length = 0;
boolean clonePoint = false;
final DoubleBuffer doubleBuffer = buffer.asDoubleBuffer();
for (int part = 0; part < numParts; part++) {
start = partOffsets[part];
if (part == (numParts - 1)) {
finish = numPoints;
} else {
finish = partOffsets[part + 1];
}
length = finish - start;
int xyLength = length;
if (length == 1) {
length = 2;
clonePoint = true;
} else {
clonePoint = false;
}
CoordinateSequence cs = geometryFactory.getCoordinateSequenceFactory().create(length, dimensions);
double[] xy = new double[xyLength * 2];
doubleBuffer.get(xy);
for (int i = 0; i < xyLength; i++) {
cs.setOrdinate(i, 0, xy[i * 2]);
cs.setOrdinate(i, 1, xy[i * 2 + 1]);
}
if (clonePoint) {
cs.setOrdinate(1, 0, cs.getOrdinate(0, 0));
cs.setOrdinate(1, 1, cs.getOrdinate(0, 1));
}
lines[part] = cs;
}
// if we have another coordinate, read and add to the coordinate
// sequences
if (dimensions == 3) {
// z min, max
// buffer.position(buffer.position() + 2 * 8);
doubleBuffer.position(doubleBuffer.position() + 2);
for (int part = 0; part < numParts; part++) {
start = partOffsets[part];
if (part == (numParts - 1)) {
finish = numPoints;
} else {
finish = partOffsets[part + 1];
}
length = finish - start;
if (length == 1) {
length = 2;
clonePoint = true;
} else {
clonePoint = false;
}
double[] z = new double[length];
doubleBuffer.get(z);
for (int i = 0; i < length; i++) {
lines[part].setOrdinate(i, 2, z[i]);
}
}
}
// Prepare line strings and return the multilinestring
LineString[] lineStrings = new LineString[numParts];
for (int part = 0; part < numParts; part++) {
lineStrings[part] = geometryFactory.createLineString(lines[part]);
}
return geometryFactory.createMultiLineString(lineStrings);
}
public void write(ByteBuffer buffer, Object geometry) {
MultiLineString multi = (MultiLineString) geometry;
Envelope box = multi.getEnvelopeInternal();
buffer.putDouble(box.getMinX());
buffer.putDouble(box.getMinY());
buffer.putDouble(box.getMaxX());
buffer.putDouble(box.getMaxY());
final int numParts = multi.getNumGeometries();
final CoordinateSequence[] lines = new CoordinateSequence[numParts];
final double[] zExtreame = {Double.NaN, Double.NaN};
final int npoints = multi.getNumPoints();
buffer.putInt(numParts);
buffer.putInt(npoints);
{
int idx = 0;
for (int i = 0; i < numParts; i++) {
lines[i] = ((LineString) multi.getGeometryN(i)).getCoordinateSequence();
buffer.putInt(idx);
idx = idx + lines[i].size();
}
}
for(int lineN = 0; lineN < lines.length; lineN++){
CoordinateSequence coords = lines[lineN];
if (shapeType == ShapeType.ARCZ) {
JTSUtilities.zMinMax(coords, zExtreame);
}
final int ncoords = coords.size();
for (int t = 0; t < ncoords; t++) {
buffer.putDouble(coords.getX(t));
buffer.putDouble(coords.getY(t));
}
}
if (shapeType == ShapeType.ARCZ) {
if (Double.isNaN(zExtreame[0])) {
buffer.putDouble(0.0);
buffer.putDouble(0.0);
} else {
buffer.putDouble(zExtreame[0]);
buffer.putDouble(zExtreame[1]);
}
for(int lineN = 0; lineN < lines.length; lineN++){
final CoordinateSequence coords = lines[lineN];
final int ncoords = coords.size();
double z;
for (int t = 0; t < ncoords; t++) {
z = coords.getOrdinate(t, 2);
if (Double.isNaN(z)) {
buffer.putDouble(0.0);
} else {
buffer.putDouble(z);
}
}
}
buffer.putDouble(-10E40);
buffer.putDouble(-10E40);
for (int t = 0; t < npoints; t++) {
buffer.putDouble(-10E40);
}
}
}
}
/*
* $Log: MultiLineHandler.java,v $ Revision 1.4 2003/11/13 22:10:35 jmacgill
* cast a null to avoid ambigous call with JTS1.4
*
* Revision 1.3 2003/07/23 23:41:09 ianschneider more testing updates
*
* Revision 1.2 2003/07/23 00:59:59 ianschneider Lots of PMD fix ups
*
* Revision 1.1 2003/05/14 17:51:20 ianschneider migrated packages
*
* Revision 1.3 2003/04/30 23:19:45 ianschneider Added construction of multi
* geometries for default return values, even if only one geometry. This could
* have effects through system.
*
* Revision 1.2 2003/03/30 20:21:09 ianschneider Moved buffer branch to main
*
* Revision 1.1.2.3 2003/03/12 15:30:14 ianschneider made ShapeType final for
* handlers - once they're created, it won't change.
*
* Revision 1.1.2.2 2003/03/07 00:36:41 ianschneider
*
* Added back the additional ShapeType parameter in ShapeHandler.read.
* ShapeHandler's need return their own special "null" shape if needed. Fixed
* the ShapefileReader to not throw exceptions for "null" shapes. Fixed
* ShapefileReader to accomodate junk after the last valid record. The theory
* goes, if the shape number is proper, that is, one greater than the previous,
* we consider that a valid record and attempt to read it. I suppose, by chance,
* the junk could coincide with the next record number. Stupid ESRI. Fixed some
* record-length calculations which resulted in writing of bad shapefiles.
*
* Revision 1.1.2.1 2003/03/06 01:16:34 ianschneider
*
* The initial changes for moving to java.nio. Added some documentation and
* improved exception handling. Works for reading, may work for writing as of
* now.
*
* Revision 1.1 2003/02/27 22:35:50 aaime New shapefile module, initial commit
*
* Revision 1.2 2003/01/22 18:31:05 jaquino Enh: Make About Box configurable
*
* Revision 1.3 2002/10/30 22:36:11 dblasby Line reader now returns
* LINESTRING(..) if there is only one part to the arc polyline.
*
* Revision 1.2 2002/09/09 20:46:22 dblasby Removed LEDatastream refs and
* replaced with EndianData[in/out]putstream
*
* Revision 1.1 2002/08/27 21:04:58 dblasby orginal
*
* Revision 1.2 2002/03/05 10:23:59 jmacgill made sure geometries were created
* using the factory methods
*
* Revision 1.1 2002/02/28 00:38:50 jmacgill Renamed files to more intuitve
* names
*
* Revision 1.3 2002/02/13 00:23:53 jmacgill First semi working JTS version of
* Shapefile code
*
* Revision 1.2 2002/02/11 18:42:45 jmacgill changed read and write statements
* so that they produce and take Geometry objects instead of specific MultiLine
* objects changed parts[] array name to partOffsets[] for clarity and
* consistency with ShapePolygon
*
* Revision 1.1 2002/02/11 16:54:43 jmacgill added shapefile code and
* directories
*
*/