package com.vividsolutions.jts.triangulate;
import java.util.*;
import com.vividsolutions.jts.geom.*;
/**
* Creates a map between the vertex {@link Coordinate}s of a
* set of {@link Geometry}s,
* and the parent geometry, and transfers the source geometry
* data objects to geometry components tagged with the coordinates.
* <p>
* This class can be used in conjunction with {@link VoronoiDiagramBuilder}
* to transfer data objects from the input site geometries
* to the constructed Voronoi polygons.
*
* @author Martin Davis
* @see VoronoiDiagramBuilder
*
*/
public class VertexTaggedGeometryDataMapper
{
private Map coordDataMap = new TreeMap();
public VertexTaggedGeometryDataMapper()
{
}
public void loadSourceGeometries(Collection geoms)
{
for (Iterator i = geoms.iterator(); i.hasNext(); ) {
Geometry geom = (Geometry) i.next();
loadVertices(geom.getCoordinates(), geom.getUserData());
}
}
public void loadSourceGeometries(Geometry geomColl)
{
for (int i = 0; i < geomColl.getNumGeometries(); i++) {
Geometry geom = geomColl.getGeometryN(i);
loadVertices(geom.getCoordinates(), geom.getUserData());
}
}
private void loadVertices(Coordinate[] pts, Object data)
{
for (int i = 0; i < pts.length; i++) {
coordDataMap.put(pts[i], data);
}
}
public List getCoordinates()
{
return new ArrayList(coordDataMap.keySet());
}
/**
* Input is assumed to be a multiGeometry
* in which every component has its userData
* set to be a Coordinate which is the key to the output data.
* The Coordinate is used to determine
* the output data object to be written back into the component.
*
* @param targetGeom
*/
public void transferData(Geometry targetGeom)
{
for (int i = 0; i < targetGeom.getNumGeometries(); i++) {
Geometry geom = targetGeom.getGeometryN(i);
Coordinate vertexKey = (Coordinate) geom.getUserData();
if (vertexKey == null) continue;
geom.setUserData(coordDataMap.get(vertexKey));
}
}
}