/*
* 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 com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;
/**
* Wrapper for a Shapefile point.
*
* @author aaime
* @author Ian Schneider
* @source $URL:
* http://svn.geotools.org/geotools/trunk/gt/modules/plugin/shapefile/src/main/java/org/geotools/data/shapefile/shp/PointHandler.java $
*
*/
public class PointHandler implements ShapeHandler {
final ShapeType shapeType;
GeometryFactory geometryFactory;
public PointHandler(ShapeType type, GeometryFactory gf) throws ShapefileException {
if ((type != ShapeType.POINT) && (type != ShapeType.POINTM)
&& (type != ShapeType.POINTZ)) { // 2d, 2d+m, 3d+m
throw new ShapefileException(
"PointHandler constructor: expected a type of 1, 11 or 21");
}
shapeType = type;
this.geometryFactory = gf;
}
public PointHandler() {
shapeType = ShapeType.POINT; // 2d
}
/**
* Returns the shapefile shape type value for a point
*
* @return int Shapefile.POINT
*/
public ShapeType getShapeType() {
return shapeType;
}
public int getLength(Object geometry) {
int length;
if (shapeType == ShapeType.POINT) {
length = 20;
} else if (shapeType == ShapeType.POINTM) {
length = 28;
} else if (shapeType == ShapeType.POINTZ) {
length = 36;
} else {
throw new IllegalStateException("Expected ShapeType of Point, got"
+ shapeType);
}
return length;
}
public Object read(ByteBuffer buffer, ShapeType type) {
if (type == ShapeType.NULL) {
return createNull();
}
double x = buffer.getDouble();
double y = buffer.getDouble();
double z = Double.NaN;
if (shapeType == ShapeType.POINTM) {
buffer.getDouble();
}
if (shapeType == ShapeType.POINTZ) {
z = buffer.getDouble();
}
return geometryFactory.createPoint(new Coordinate(x, y, z));
}
private Object createNull() {
return geometryFactory.createPoint(new Coordinate(Double.NaN,
Double.NaN, Double.NaN));
}
public void write(ByteBuffer buffer, Object geometry) {
Coordinate c = ((Point) geometry).getCoordinate();
buffer.putDouble(c.x);
buffer.putDouble(c.y);
if (shapeType == ShapeType.POINTZ) {
if (Double.isNaN(c.z)) { // nan means not defined
buffer.putDouble(0.0);
} else {
buffer.putDouble(c.z);
}
}
if ((shapeType == ShapeType.POINTZ) || (shapeType == ShapeType.POINTM)) {
buffer.putDouble(-10E40); // M
}
}
}