root / trunk / extensions / extGeoProcessing / src / com / iver / cit / gvsig / geoprocess / spatialjoin / fmap / NearestFeatureVisitor.java @ 5412
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| 1 | 5412 | azabala | /*
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| 2 | * Created on 01-mar-2006
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| 3 | *
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| 4 | * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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| 5 | *
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| 6 | * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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| 7 | *
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| 8 | * This program is free software; you can redistribute it and/or
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| 9 | * modify it under the terms of the GNU General Public License
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| 10 | * as published by the Free Software Foundation; either version 2
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| 11 | * of the License, or (at your option) any later version.
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| 12 | *
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| 13 | * This program is distributed in the hope that it will be useful,
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | * GNU General Public License for more details.
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| 17 | *
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| 18 | * You should have received a copy of the GNU General Public License
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| 19 | * along with this program; if not, write to the Free Software
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| 20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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| 21 | *
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| 22 | * For more information, contact:
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| 23 | *
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| 24 | * Generalitat Valenciana
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| 25 | * Conselleria d'Infraestructures i Transport
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| 26 | * Av. Blasco Ib??ez, 50
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| 27 | * 46010 VALENCIA
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| 28 | * SPAIN
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| 29 | *
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| 30 | * +34 963862235
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| 31 | * gvsig@gva.es
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| 32 | * www.gvsig.gva.es
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| 33 | *
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| 34 | * or
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| 35 | *
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| 36 | * IVER T.I. S.A
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| 37 | * Salamanca 50
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| 38 | * 46005 Valencia
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| 39 | * Spain
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| 40 | *
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| 41 | * +34 963163400
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| 42 | * dac@iver.es
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| 43 | */
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| 44 | /* CVS MESSAGES:
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| 45 | *
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| 46 | * $Id$
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| 47 | * $Log$
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| 48 | * Revision 1.1 2006-05-24 21:09:47 azabala
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| 49 | * primera version en cvs despues de refactoring orientado a crear un framework extensible de geoprocessing
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| 50 | *
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| 51 | * Revision 1.2 2006/03/07 21:01:33 azabala
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| 52 | * *** empty log message ***
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| 53 | *
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| 54 | * Revision 1.1 2006/03/06 19:48:39 azabala
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| 55 | * *** empty log message ***
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| 56 | *
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| 57 | * Revision 1.1 2006/03/05 19:59:47 azabala
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| 58 | * *** empty log message ***
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| 59 | *
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| 60 | *
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| 61 | */
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| 62 | package com.iver.cit.gvsig.geoprocess.spatialjoin.fmap; |
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| 63 | |||
| 64 | |||
| 65 | import com.iver.cit.gvsig.fmap.core.IGeometry; |
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| 66 | import com.iver.cit.gvsig.fmap.layers.FLayer; |
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| 67 | import com.iver.cit.gvsig.fmap.layers.layerOperations.VectorialData; |
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| 68 | import com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor; |
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| 69 | import com.iver.cit.gvsig.fmap.operations.strategies.VisitException; |
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| 70 | import com.vividsolutions.jts.geom.Geometry; |
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| 71 | /**
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| 72 | * This Visitor looks for the nearest feature of a FLayer B
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| 73 | * to a specified feature of a FLayer A.
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| 74 | * @author azabala
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| 75 | *
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| 76 | */
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| 77 | public class NearestFeatureVisitor implements FeatureVisitor { |
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| 78 | |||
| 79 | private Geometry queryGeometry;
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| 80 | private int solutionIndex = -1; |
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| 81 | private double shortestDist = Double.MAX_VALUE; |
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| 82 | |||
| 83 | public NearestFeatureVisitor(Geometry geometry){
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| 84 | this.queryGeometry = geometry;
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| 85 | } |
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| 86 | |||
| 87 | public NearestFeatureVisitor(){
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| 88 | } |
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| 89 | |||
| 90 | public void visit(IGeometry g, int index) throws VisitException { |
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| 91 | double dist = queryGeometry.distance(g.toJTSGeometry());
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| 92 | if(dist < shortestDist){
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| 93 | shortestDist = dist; |
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| 94 | solutionIndex = index; |
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| 95 | }//if
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| 96 | } |
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| 97 | |||
| 98 | public int getNearestFeatureIndex(){ |
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| 99 | return solutionIndex;
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| 100 | } |
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| 101 | |||
| 102 | public double getShortestDist(){ |
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| 103 | return shortestDist;
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| 104 | } |
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| 105 | |||
| 106 | public boolean hasFoundShortest(){ |
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| 107 | return solutionIndex != -1; |
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| 108 | } |
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| 109 | |||
| 110 | public void stop(FLayer layer) { |
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| 111 | } |
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| 112 | |||
| 113 | public boolean start(FLayer layer) { |
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| 114 | if (layer instanceof VectorialData) { |
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| 115 | return true; |
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| 116 | } |
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| 117 | return false; |
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| 118 | } |
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| 119 | |||
| 120 | public String getProcessDescription() { |
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| 121 | return "Looking nearest geometry for a spatial join"; |
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| 122 | } |
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| 123 | |||
| 124 | |||
| 125 | public void setQueryGeometry(Geometry queryGeometry) { |
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| 126 | this.queryGeometry = queryGeometry;
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| 127 | } |
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| 128 | |||
| 129 | } |