root / trunk / libraries / libFMap / src / com / iver / cit / gvsig / fmap / drivers / featureiterators / SpatialQueryFeatureIterator.java @ 18424
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/*
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* Created on 12-abr-2007
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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: SpatialQueryFeatureIterator.java 18424 2008-02-04 07:37:14Z vcaballero $
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* $Log$
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* Revision 1.4 2007-09-19 16:02:29 azabala
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* bug solved (feature returned by iterator has the attributes of the next record)
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*
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* Revision 1.3 2007/06/07 09:30:09 azabala
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* refactor of BOUND FACTOR
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*
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* Revision 1.2 2007/06/06 18:03:03 azabala
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* bug fixed
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*
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* Revision 1.1 2007/05/29 19:08:11 azabala
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* first version in cvs
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*
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* Revision 1.1 2007/04/19 17:27:58 azabala
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* first version in cvs
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*
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*
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*/
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package com.iver.cit.gvsig.fmap.drivers.featureiterators; |
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import java.awt.geom.Rectangle2D; |
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import org.cresques.cts.ICoordTrans; |
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import org.cresques.cts.IProjection; |
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import org.geotools.resources.geometry.XRectangle2D; |
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import com.hardcode.gdbms.driver.exceptions.ReadDriverException; |
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import com.hardcode.gdbms.engine.values.Value; |
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import com.iver.cit.gvsig.exceptions.expansionfile.ExpansionFileReadException; |
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import com.iver.cit.gvsig.fmap.core.DefaultFeature; |
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import com.iver.cit.gvsig.fmap.core.IFeature; |
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import com.iver.cit.gvsig.fmap.core.IGeometry; |
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import com.iver.cit.gvsig.fmap.drivers.BoundedShapes; |
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import com.iver.cit.gvsig.fmap.layers.ReadableVectorial; |
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public class SpatialQueryFeatureIterator extends DefaultFeatureIterator { |
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/**
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* region for which features we are iterating
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*/
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protected Rectangle2D rect; |
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/**
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* Checks feature geometries to see if intersects the given extent filter
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*/
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protected ISpatialCheck spatialChecker;
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/**
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* Feature which will be returned the next time
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*/
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IFeature nextFeature = null;
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/**
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* Proportion of query extent area and layer extent area
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* to use boundedshapes capability (reading bounds without
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* reading its geometry)
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*
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*/
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public static final double BOUNDED_SHAPES_FACTOR = 4.0d; |
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/**
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* Constructor.
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*
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* @param source
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* vectorial data source
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* @param sourceProj
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* original projection of the data (it could be null)
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* @param targetProj
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* projection of the returned features
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* @param fieldNames
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* @param spatialQuery
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* @throws ReadDriverException
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*/
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public SpatialQueryFeatureIterator(ReadableVectorial source,
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IProjection sourceProj, IProjection targetProj, |
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String[] fieldNames, Rectangle2D spatialQuery, boolean fastIteration) |
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throws ReadDriverException {
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super(source, sourceProj, targetProj, fieldNames);
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setRect(spatialQuery); |
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if(fastIteration)
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spatialChecker = new FastSpatialCheck();
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else
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spatialChecker = new PrecisseSpatialCheck();
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} |
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public Rectangle2D getRect() { |
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return rect;
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} |
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public void setRect(Rectangle2D rect) { |
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//by design, rect Rectangle2D must be in the target reprojection
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//if targetReprojection != sourceReprojection, we are going to reproject
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//rect to the source reprojection (is faster).
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//once spatial check is made, result features will be reprojected in the inverse direction
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if(this.targetProjection != null && |
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this.sourceProjection != null && |
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this.targetProjection.getAbrev() != this.sourceProjection.getAbrev()){ |
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ICoordTrans trans = targetProjection.getCT(sourceProjection); |
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rect = trans.convert(rect); |
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} |
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this.rect = rect;
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} |
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public boolean hasNext() throws ReadDriverException { |
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try {
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while(true){ |
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if(currentFeature >= source.getShapeCount())
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return false; |
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if(spatialChecker.intersects(rect, currentFeature)){
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//we only update the counter if spatialChecker could read the geometry
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//if it is boundedshape it doesnt read the geometry, so we need to read
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//currentFeature again
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// if(spatialChecker.returnShapes())
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// currentFeature++;
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break;
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} |
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else
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currentFeature++; |
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}//while
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//here, currentFeature intersects with the rectangle2d filter
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IGeometry geom = null;
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IFeature feat = null;
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if(spatialChecker.returnShapes()){
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geom = spatialChecker.getLastGeometry(); |
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}else{
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geom = source.getShape(currentFeature); |
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// currentFeature++;
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reprojectIfNecessary(geom); |
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} |
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Value[] regAtt = getValues(currentFeature);
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feat = new DefaultFeature(geom, regAtt, currentFeature + ""); |
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nextFeature = feat; |
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currentFeature++; |
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return true; |
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} catch (ExpansionFileReadException e) {
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throw new ReadDriverException( |
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"Error accediendo a datos del driver durante la iteracion",
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e); |
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} |
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} |
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public IFeature next() throws ReadDriverException { |
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return nextFeature;
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} |
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/**
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* Classes that chekcs if a specified feature intersects with a given Rectangle2D must
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* implement this interface.
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*
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* This interface is necessary because there are many approach to do that
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* (an exact intersection, an intersection based in bounds2d, etc)
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*
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*
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* @author azabala
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*
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*/
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interface ISpatialCheck { |
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public boolean intersects(Rectangle2D extent, int featureIndex) |
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throws ExpansionFileReadException, ReadDriverException;
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/**
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* Tells if this spatialcheck could return the geometry of the features
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* (or if it is boundedshapes based, needs another driver access operation)
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* @return
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*/
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public boolean returnShapes(); |
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/**
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* Returns the last readed geometry (if the spatialcheck do that)
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* @return
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*/
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public IGeometry getLastGeometry();
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/**
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* Return the index of the last readed geometry
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* @return
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*/
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public int getIndexOfLast(); |
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} |
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/**
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* All classes that return the bounds Rectangle2D of a feature must
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* implement this interface.
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*
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* @author azabala
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*
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*/
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interface BoundsProvider { |
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/**
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* Returns the bound of the specified feature index
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*
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* @param featureIndex
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* @return
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* @throws ExpansionFileReadException
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* @throws ReadDriverException
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*/
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public Rectangle2D getBounds(int featureIndex) |
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throws ExpansionFileReadException, ReadDriverException;
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/**
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* Tells if this boundsProvider could returns shapes
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*
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* @return
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*/
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public boolean returnShapes(); |
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/**
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* Returns the last geometry readed, if the boundsProvider could do that
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*
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* @return
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*/
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public IGeometry getLastGeometry();
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} |
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/**
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* BoundsProvider that uses a BoundedShapes (faster than others)
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*
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* @author azabala
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*
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*/
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class BoundedShapesProvider implements BoundsProvider { |
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BoundedShapes boundedShapes; |
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BoundedShapesProvider(BoundedShapes boundedShapes) {
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this.boundedShapes = boundedShapes;
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} |
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public Rectangle2D getBounds(int featureIndex) |
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throws ExpansionFileReadException, ReadDriverException {
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return boundedShapes.getShapeBounds(featureIndex);
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} |
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public boolean returnShapes() { |
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return false; |
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} |
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public IGeometry getLastGeometry() {
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return null; |
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} |
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} |
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/**
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* BoundsProvider that returns feature bounds from the feature geometry
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*
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* @author azabala
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*
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*/
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class IGeometryBoundProvider implements BoundsProvider { |
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/**
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* Adapter of a given driver from which we read the features bounds.
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*/
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ReadableVectorial source; |
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IGeometry lastGeometry; |
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IGeometryBoundProvider(ReadableVectorial sourceOfFeatures) {
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this.source = sourceOfFeatures;
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} |
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public Rectangle2D getBounds(int featureIndex) |
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throws ExpansionFileReadException, ReadDriverException {
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lastGeometry = source.getShape(featureIndex); |
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if (lastGeometry ==null) |
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return new Rectangle2D.Double(0,0,0,0); |
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// reprojectIfNecessary(this.lastGeometry);
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//bounds2D is in the original projection
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Rectangle2D solution = lastGeometry.getBounds2D();
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//the readed geometry in the specified projection
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// reprojectIfNecessary(this.lastGeometry);
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return solution;
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} |
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public IGeometry getLastGeometry() {
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reprojectIfNecessary(this.lastGeometry);
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return lastGeometry;
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} |
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public boolean returnShapes() { |
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return true; |
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} |
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} |
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/**
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* Checks if the specified features intersects with rectangle2D instances in
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* a rough but fast manner.
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*
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*/
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class FastSpatialCheck implements ISpatialCheck { |
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BoundsProvider boundProvider; |
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int lastIndex;
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FastSpatialCheck() {
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try {
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if(isBoundedShapesNecessary()){
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if (source instanceof BoundedShapes){ |
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boundProvider = new BoundedShapesProvider(
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(BoundedShapes) source); |
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}else if (source.getDriver() instanceof BoundedShapes){ |
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boundProvider = new BoundedShapesProvider(
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(BoundedShapes) source.getDriver()); |
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}else{
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boundProvider = new IGeometryBoundProvider(source);
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} |
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}else{
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boundProvider = new IGeometryBoundProvider(source);
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} |
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} catch (ExpansionFileReadException e) {
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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boundProvider = new IGeometryBoundProvider(source);
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} catch (ReadDriverException e) {
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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boundProvider = new IGeometryBoundProvider(source);
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} |
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} |
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protected boolean isBoundedShapesNecessary() throws ReadDriverException, ExpansionFileReadException { |
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Rectangle2D driverExtent = source.getFullExtent();
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double areaExtent = rect.getWidth() * rect.getHeight();
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double areaFullExtent = driverExtent.getWidth() *
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driverExtent.getHeight(); |
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return areaExtent < (areaFullExtent / BOUNDED_SHAPES_FACTOR);
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} |
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public boolean intersects(Rectangle2D extent, int featureIndex) |
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throws ExpansionFileReadException, ReadDriverException {
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this.lastIndex = featureIndex;
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Rectangle2D featureBounds = boundProvider.getBounds(featureIndex);
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return XRectangle2D.intersectInclusive(extent, featureBounds);
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} |
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public BoundsProvider getBoundsProvider() {
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return boundProvider;
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} |
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public boolean returnShapes() { |
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return boundProvider.returnShapes();
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} |
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public IGeometry getLastGeometry() {
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return boundProvider.getLastGeometry();
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} |
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public int getIndexOfLast() { |
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return lastIndex;
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} |
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}// FastSpatialCheck
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/**
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* Checks if the specified features intersect with rectangle2D instances in
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* a precisse manner
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*
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* @author azabala
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*
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*/
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class PrecisseSpatialCheck implements ISpatialCheck { |
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IGeometry lastGeometry; |
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int lastIndex;
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PrecisseSpatialCheck() {
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} |
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public boolean intersects(Rectangle2D extent, int featureIndex) |
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throws ExpansionFileReadException, ReadDriverException {
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this.lastIndex = featureIndex;
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this.lastGeometry = source.getShape(lastIndex);
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//the spatial check is made in the original projection
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boolean solution = lastGeometry.fastIntersects(rect.getMinX(),
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rect.getMinY(), rect.getWidth(), rect.getHeight()); |
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//but the solution is returned in the new projection (if applies)
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reprojectIfNecessary(lastGeometry); |
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return solution;
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} |
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public boolean returnShapes() { |
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return true; |
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} |
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public IGeometry getLastGeometry() {
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return lastGeometry;
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} |
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public int getIndexOfLast() { |
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return lastIndex;
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} |
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} |
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} |