Class VertexTaggedGeometryDataMapper

1	/*
2	* Copyright (c) 2016 Vivid Solutions.
3	*
4	* All rights reserved. This program and the accompanying materials
5	* are made available under the terms of the Eclipse Public License 2.0
6	* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
7	* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
8	* and the Eclipse Distribution License is available at
9	*
10	* http://www.eclipse.org/org/documents/edl-v10.php.
11	*/
12
13	package org.locationtech.jts.triangulate;
14
15	import java.util.ArrayList;
16	import java.util.Collection;
17	import java.util.Iterator;
18	import java.util.List;
19	import java.util.Map;
20	import java.util.TreeMap;
21
22	import org.locationtech.jts.geom.Coordinate;
23	import org.locationtech.jts.geom.Geometry;
24
25	/**
26	* Creates a map between the vertex {@link Coordinate}s of a
27	* set of {@link Geometry}s,
28	* and the parent geometry, and transfers the source geometry
29	* data objects to geometry components tagged with the coordinates.
30	* <p>
31	* This class can be used in conjunction with {@link VoronoiDiagramBuilder}
32	* to transfer data objects from the input site geometries
33	* to the constructed Voronoi polygons.
34	*
35	* @author Martin Davis
36	* @see VoronoiDiagramBuilder
37	*
38	*/
39	public class VertexTaggedGeometryDataMapper
40	{
41	private Map coordDataMap = new TreeMap();
42
43	public VertexTaggedGeometryDataMapper()
44	{
45
46	}
47
48	public void loadSourceGeometries(Collection geoms)
49	{
50	for (Iterator i = geoms.iterator(); i.hasNext(); ) {
51	Geometry geom = (Geometry) i.next();
52	loadVertices(geom.getCoordinates(), geom.getUserData());
53	}
54	}
55
56	public void loadSourceGeometries(Geometry geomColl)
57	{
58	for (int i = 0; i < geomColl.getNumGeometries(); i++) {
59	Geometry geom = geomColl.getGeometryN(i);
60	loadVertices(geom.getCoordinates(), geom.getUserData());
61	}
62	}
63
64	private void loadVertices(Coordinate[] pts, Object data)
65	{
66	for (int i = 0; i < pts.length; i++) {
67	coordDataMap.put(pts[i], data);
68	}
69	}
70
71	public List getCoordinates()
72	{
73	return new ArrayList(coordDataMap.keySet());
74	}
75
76	/**
77	* Input is assumed to be a multiGeometry
78	* in which every component has its userData
79	* set to be a Coordinate which is the key to the output data.
80	* The Coordinate is used to determine
81	* the output data object to be written back into the component.
82	*
83	* @param targetGeom
84	*/
85	public void transferData(Geometry targetGeom)
86	{
87	for (int i = 0; i < targetGeom.getNumGeometries(); i++) {
88	Geometry geom = targetGeom.getGeometryN(i);
89	Coordinate vertexKey = (Coordinate) geom.getUserData();
90	if (vertexKey == null) continue;
91	geom.setUserData(coordDataMap.get(vertexKey));
92	}
93	}
94	}
95