root / trunk / extensions / extGeoProcessing / src / com / iver / gvsig / geoprocessing / impl / dissolve / GenericDissolveVisitor.java @ 4571
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/*
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* Created on 21-mar-2006
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*
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* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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/* CVS MESSAGES:
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*
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* $Id: GenericDissolveVisitor.java 4571 2006-03-23 21:07:32Z azabala $
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* $Log$
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* Revision 1.2 2006-03-23 21:03:45 azabala
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* *** empty log message ***
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*
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* Revision 1.1 2006/03/21 19:27:38 azabala
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* *** empty log message ***
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*
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*
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*/
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package com.iver.gvsig.geoprocessing.impl.dissolve; |
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import java.awt.geom.Rectangle2D; |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.Stack; |
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import com.hardcode.gdbms.engine.data.driver.DriverException; |
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import com.hardcode.gdbms.engine.values.Value; |
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import com.iver.cit.gvsig.fmap.core.DefaultFeature; |
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import com.iver.cit.gvsig.fmap.core.IGeometry; |
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import com.iver.cit.gvsig.fmap.core.v02.FConverter; |
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import com.iver.cit.gvsig.fmap.edition.EditionException; |
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import com.iver.cit.gvsig.fmap.layers.FBitSet; |
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import com.iver.cit.gvsig.fmap.layers.FLayer; |
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import com.iver.cit.gvsig.fmap.layers.FLyrVect; |
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import com.iver.cit.gvsig.fmap.layers.SelectableDataSource; |
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import com.iver.cit.gvsig.fmap.layers.layerOperations.AlphanumericData; |
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import com.iver.cit.gvsig.fmap.layers.layerOperations.VectorialData; |
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import com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor; |
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import com.iver.cit.gvsig.fmap.operations.strategies.Strategy; |
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import com.iver.cit.gvsig.fmap.operations.strategies.VisitException; |
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import com.iver.gvsig.geoprocessing.model.FeatureProcessor; |
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import com.vividsolutions.jts.geom.Geometry; |
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import com.vividsolutions.jts.geom.GeometryFactory; |
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public class GenericDissolveVisitor implements FeatureVisitor { |
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/**
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* Allows to get attributes of disolved layer features
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*/
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SelectableDataSource recordset; |
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/**
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* Is used to do spatial querys (looking for adjacent polygons to visited
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* feature geometry
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*/
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FLyrVect dissolvedLayer; |
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/**
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* It marks all features that have already been dissolved (to avoid process
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* them in subsecuent steps)
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*
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*/
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FBitSet dissolvedGeometries; |
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/**
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* Processes results of dissolve operations (save them in a file, or cache
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* them in memory, etc)
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*/
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FeatureProcessor featureProcessor; |
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/**
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* Strategy to make queries to first layer
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*/
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Strategy strategy; |
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/**
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* Visitor to looks for adjacent features to a given feature
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*/
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IndividualGeometryDissolveVisitor visitor = null;
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/**
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* Constructor
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*
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* @param layerToDissolve
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*/
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public GenericDissolveVisitor(FeatureProcessor processor) {
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this.featureProcessor = processor;
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dissolvedGeometries = new FBitSet();
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} |
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public int getNumProcessedGeometries(){ |
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return dissolvedGeometries.cardinality();
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} |
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/*
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* Algorithm to compute dissolve is strongly based in depth first
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* algorithm to traverse graphs.
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*
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* It puts features to dissolve in a stack.
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* While stack is not empty, get Features and looks for adjacent to it.
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* For each adjacent feature, verify its dissolve field value,
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* and if it is similar to feature to dissolve
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* with, obtain a new feature by unioning their geometries.
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* For each adjacent feature, put it in the Stack
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*/
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public void visit(IGeometry g, int index) throws VisitException { |
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if (!dissolvedGeometries.get(index)) {
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// if we havent dissolved this feature
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Stack toDissol = new Stack();// stack for adjacent features |
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DissolvedFeature feature; |
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try {
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feature = createFeature(g, index); |
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Geometry jtsGeometry = g.toJTSGeometry(); |
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feature.setJtsGeometry(jtsGeometry); |
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toDissol.push(feature); |
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List geometries = dissolve(toDissol);
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Geometry dissolvedGeom = union(geometries); |
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DissolvedFeature newFeature = |
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createFeature(null, -1); |
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newFeature.setJtsGeometry(dissolvedGeom); |
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this.featureProcessor.processFeature(newFeature);
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} catch (DriverException e) {
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throw new VisitException( |
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"Error al procesar las geometrias a fusionar durante dissolve");
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} catch (com.iver.cit.gvsig.fmap.DriverException e) {
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throw new VisitException( |
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"Error al procesar las geometrias a fusionar durante dissolve");
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} |
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}// if
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} |
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protected Geometry union(List geometries){ |
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Geometry[] geom = new Geometry[geometries.size()]; |
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geometries.toArray(geom); |
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GeometryFactory fact = geom[0].getFactory();
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Geometry geomColl = fact.createGeometryCollection(geom); |
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Geometry union = geomColl.buffer(0.0);
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return union;
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} |
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/**
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* Inner class to manage dissolve geoprocess. It mantains feature info
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* interesting for dissolve (int index, JTS Geometry, etc)
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*
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* @author azabala
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*
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*/
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class DissolvedFeature extends DefaultFeature { |
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int index;
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Geometry jtsGeometry; |
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public DissolvedFeature(IGeometry geom, Value[] att, int index) { |
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super(geom, att);
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this.index = index;
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} |
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public int getIndex() { |
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return index;
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} |
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public Geometry getJtsGeometry() {
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return jtsGeometry;
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} |
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public void setJtsGeometry(Geometry jtsGeometry) { |
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this.jtsGeometry = jtsGeometry;
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} |
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public IGeometry getGeometry() {
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IGeometry solution = super.getGeometry();
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if (solution == null && jtsGeometry != null) { |
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solution = FConverter.jts_to_igeometry(jtsGeometry); |
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} |
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return solution;
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} |
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} |
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/**
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* Creates a new IFeature with util info for dissolve geoprocess (it ignores
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* non numerical values, etc)
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*
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* @param g
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* @param index
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* @return
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* @throws DriverException
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*/
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private DissolvedFeature createFeature(IGeometry g, int index) |
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throws DriverException {
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DissolvedFeature solution = new DissolvedFeature(g, null, index); |
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return solution;
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} |
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/**
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* For each individual geometry processed in DissolveVisitor's visit
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* method, this Visitor visits its adjacent polygons geometries to check
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* dissolve conditions.
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*
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* @author azabala
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*
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*/
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class IndividualGeometryDissolveVisitor implements FeatureVisitor { |
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/**
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* Marks index of features that have been dissolved yet
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*/
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FBitSet dissolvedFeatures; |
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/**
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* It saves all features for we are looking for adjacent geometries.
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* Dissolving is similar to network tracking algorithms: one feature is
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* adjacent to two, two is adjacent to four, etc We will save features
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* to process in this stack (Depth first aproximation)
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*/
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Stack featuresToDissolve;
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/**
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* Feature for which we are looking for features to dissolve
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*/
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DissolvedFeature feature; |
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/**
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* Recordset to recover attribute values
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*/
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SelectableDataSource recordset; |
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IndividualGeometryDissolveVisitor(DissolvedFeature feature, |
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FBitSet dissolvedFeatures, Stack featuresToDissolve) {
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this.dissolvedFeatures = dissolvedFeatures;
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this.feature = feature;
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this.featuresToDissolve = featuresToDissolve;
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} |
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public String getProcessDescription() { |
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return "Dissolving a polygon with its adjacents"; |
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} |
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public void visit(IGeometry g, int index) throws VisitException { |
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// Its the feature whose adjacents we are looking for?
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if (index == feature.getIndex())
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return;
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// have we dissolved this feature yet?
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if (dissolvedFeatures.get(index))
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return;
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try {
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Geometry jtsGeo = g.toJTSGeometry(); |
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DissolvedFeature adjacentFeature = createFeature(g, index); |
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adjacentFeature.setJtsGeometry(jtsGeo); |
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if (jtsGeo.intersects(feature.getJtsGeometry())) {// They are adjacent |
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//TODO PARA HACER GENERICO EL ALGORITMO, Y QUE VALGA
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//TANTO PARA DISSOLVER BUFFERS COMO PARA UN DISSOLVE
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//ALFANUMERICO, AQUI USARIAMOS UN STRATEGY DISTINTO
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dissolvedFeatures.set(index); |
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featuresToDissolve.push(adjacentFeature); |
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//geometriesToDissolve.add(jtsGeo);
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//List toDissolve = dissolve(featuresToDissolve);
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//geometriesToDissolve.addAll(toDissolve);
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}// if touches
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} catch (DriverException e) {
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throw new VisitException( |
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"Error al cargar los pol?gonos adyacentes durante un dissolve");
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} |
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}// visit
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public void stop(FLayer layer) { |
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} |
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// FIXME Create an abstract FeatureVisitor
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public boolean start(FLayer layer) { |
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try {
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recordset = ((AlphanumericData) layer).getRecordset(); |
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} catch (com.iver.cit.gvsig.fmap.DriverException e) {
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return false; |
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} |
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return true; |
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} |
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public void setProcessedFeature(DissolvedFeature feature2) { |
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this.feature = feature2;
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} |
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}// IndividualDissolve
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private List dissolve(Stack toDissol) |
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throws com.iver.cit.gvsig.fmap.DriverException, VisitException {
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List solution = new ArrayList(); |
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while (toDissol.size() != 0) { |
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DissolvedFeature feature = (DissolvedFeature) toDissol.pop(); |
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// flags this idx (to not to process in future)
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dissolvedGeometries.set(feature.getIndex()); |
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if (visitor == null) { |
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visitor = new IndividualGeometryDissolveVisitor(feature,
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dissolvedGeometries, toDissol); |
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} else {
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visitor.setProcessedFeature(feature); |
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} |
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solution.add(feature.getJtsGeometry()); |
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Rectangle2D bounds = feature.getGeometry().getBounds2D();
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double xmin = bounds.getMinX();
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double ymin = bounds.getMinY();
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double xmax = bounds.getMaxX();
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double ymax = bounds.getMaxY();
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double magnify = 15d; |
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Rectangle2D query = new Rectangle2D.Double(xmin - magnify, ymin |
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- magnify, (xmax - xmin) + magnify, (ymax - ymin) + magnify); |
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strategy.process(visitor, query); |
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}// while
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return solution;
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} |
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public void stop(FLayer layer) { |
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this.featureProcessor.finish();
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} |
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public boolean start(FLayer layer) { |
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if (layer instanceof AlphanumericData && layer instanceof VectorialData) { |
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try {
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dissolvedLayer = (FLyrVect) layer; |
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recordset = ((AlphanumericData) layer).getRecordset(); |
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featureProcessor.start(); |
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} catch (com.iver.cit.gvsig.fmap.DriverException e) {
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return false; |
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} catch (EditionException e) {
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return false; |
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} |
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return true; |
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} |
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return false; |
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} |
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public void setStrategy(Strategy strategy) { |
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this.strategy = strategy;
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} |
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public String getProcessDescription() { |
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return "Dissolving polygons of a layer"; |
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} |
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} |
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