root / branches / v2_0_0_prep / libraries / libFMap_spatialindex / src / org / gvsig / fmap / data / index / gt2 / QuadtreeGt2.java @ 23201
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/*
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* Created on 16-may-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: QuadtreeGt2.java 10627 2007-03-06 17:10:21Z caballero $
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* $Log$
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* Revision 1.3 2007-03-06 17:08:59 caballero
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* Exceptions
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*
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* Revision 1.2 2006/11/29 19:27:59 azabala
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* bug fixed (caused when we query for a bbox which is greater or equal to a layer bbox)
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*
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* Revision 1.1 2006/05/24 21:58:04 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 org.gvsig.fmap.data.index.gt2; |
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import java.io.File; |
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import java.util.List; |
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import java.util.Stack; |
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import org.geotools.index.quadtree.Node; |
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import org.geotools.index.quadtree.QuadTree; |
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import org.geotools.index.quadtree.StoreException; |
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import org.geotools.index.quadtree.fs.FileSystemIndexStore; |
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import org.geotools.index.quadtree.fs.IndexHeader; |
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import org.gvsig.fmap.data.index.IndexException; |
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import org.gvsig.fmap.data.index.IntSpatialIndex; |
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import org.gvsig.fmap.data.index.PersistentSpatialIndex; |
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import com.vividsolutions.jts.geom.Envelope; |
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/**
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* This Quadtree spatial index implementation is based in a fork of
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* org.geotools.index.quadtree.Quadtree implementation. <br>
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* This implementation offers us:
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* <ol>
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* <li>Persistence of spatial index</li>
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* </ol>
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* We had to fork geotools quadtree for many reasons:
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* <ol>
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* <li>It was strongly dependent of SHP format, so it returned not only a num
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* of rectangle, it also returned byte offset of this rectangle in shp file</li>
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* <li> Query artifact wasnt run well at all </li>
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* </ol>
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*
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* @author azabala
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*
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*/
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public class QuadtreeGt2 extends IntSpatialIndex implements PersistentSpatialIndex { |
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/**
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* Geotools quadtree implementation
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*/
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QuadTree quadtree; |
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/**
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* Persistent storage
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*/
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String quadtreeFile;
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/**
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* Spatial index file extension
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*/
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final String qExt = ".qix"; |
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/**
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* qix format has many versions, and allows different byte orders.
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*/
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String byteOrder;
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/**
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* Bounds of the layer to index
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*/
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Envelope bounds; |
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/**
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* Number of records of the layer to index
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*/
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int numRecs = 0; |
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boolean inMemory = false; |
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/**
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* Constructor. You must say a qix file path, and if you want to overwrite
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* this file if exists. Also, you must specify how many geometries are going
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* to index, and the bounding box of all the geometries.
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*
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*
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* @param quadtreeFile
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* qix file path
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* @param byteOrder
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* byte order (bigendian, etc)
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* @param bounds
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* Envelope of all the geometries to index
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* @param numRecords
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* num of geometries to index
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* @param overwrite
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* if we want to overwrite a possible existing qix file
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* @throws IndexException
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*/
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public QuadtreeGt2(String quadtreeFile, String byteOrder, |
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org.gvsig.fmap.geom.primitive.Envelope bounds, int numRecords,
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boolean overwrite) throws IndexException { |
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this.quadtreeFile = quadtreeFile + qExt;
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this.byteOrder = byteOrder;
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this.bounds = toJtsEnvelope(bounds);
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this.numRecs = numRecords;
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if (exists()) {
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if (!overwrite) {
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load(); |
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return;
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} |
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} |
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quadtree = new QuadTree(numRecs, this.bounds); |
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} |
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/**
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* If the spatial index file exists and has content
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*/
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public boolean exists() { |
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return (new File(quadtreeFile).length() != 0); |
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} |
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public void load() throws IndexException { |
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if (quadtree == null) { |
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load(new File(quadtreeFile)); |
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} |
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} |
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public void load(File f) throws IndexException { |
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try {
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FileSystemIndexStore store = new FileSystemIndexStore(f);
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quadtree = store.load(); |
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this.quadtreeFile = f.getAbsolutePath();
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} catch (StoreException e) {
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throw new IndexException(e); |
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} |
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} |
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/**
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*
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*
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*/
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public List query(org.gvsig.fmap.geom.primitive.Envelope env) { |
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if (quadtree == null) |
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throw new IllegalStateException("This quadtree is null."); |
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if (env == null) |
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throw new IllegalArgumentException("Envelope cannot be null."); |
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return quadtree.query(toJtsEnvelope(env));
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} |
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/**
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* Inserts an object in the index
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*/
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public void insert(org.gvsig.fmap.geom.primitive.Envelope env, int index) { |
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if (env == null) |
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throw new IllegalArgumentException("Envelope cannot be null"); |
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Envelope e = toJtsEnvelope(env); |
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if (e == null) |
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throw new IllegalStateException( |
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"JTS Envelope conversion returns null");
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System.out.println("recno=" + index); |
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if (quadtree == null) |
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throw new IllegalStateException("quadtree is null"); |
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try {
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quadtree.insert(index, toJtsEnvelope(env)); |
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} catch (StoreException se) {
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// TODO Auto-generated catch block
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se.printStackTrace(); |
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} |
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} |
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public void delete(org.gvsig.fmap.geom.primitive.Envelope env, int index) { |
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if (inMemory)
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quadtree.delete(toJtsEnvelope(env), index); |
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} |
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public Envelope toJtsEnvelope(org.gvsig.fmap.geom.primitive.Envelope env) {
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if (env == null) |
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return null; |
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double[] min = env.getLowerCorner(); |
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double[] max = env.getUpperCorner(); |
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return new Envelope(min[0], max[0], min[1], max[1]); |
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} |
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/**
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*
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* @throws StoreException
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* @deprecated
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*/
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void openQuadTree() throws StoreException { |
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if (quadtree == null) { |
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File file = new File(quadtreeFile); |
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// Intento de cargar todo el quadtree en memoria
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FileSystemIndexStore store = new FileSystemIndexStore(file);
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quadtree = store.load(); |
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} |
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} |
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void openQuadTreeInMemory() throws StoreException { |
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if (quadtree == null) { |
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File file = new File(quadtreeFile); |
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// Intento de cargar todo el quadtree en memoria
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FileSystemIndexStore store = new FileSystemIndexStore(file);
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QuadTree filequadtree = store.load(); |
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quadtree = new QuadTree(filequadtree.getNumShapes(), filequadtree
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.getMaxDepth(), filequadtree.getRoot().getBounds()); |
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Stack nodes = new Stack(); |
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nodes.push(filequadtree.getRoot()); |
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while (nodes.size() != 0) { |
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Node node = (Node) nodes.pop(); |
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Envelope nodeEnv = node.getBounds(); |
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int[] shapeIds = node.getShapesId(); |
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for (int i = 0; i < shapeIds.length; i++) { |
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quadtree.insert(shapeIds[i], nodeEnv); |
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} |
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int numSubnodes = node.getNumSubNodes();
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for (int i = 0; i < numSubnodes; i++) { |
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nodes.push(node.getSubNode(i)); |
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} |
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}// while
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filequadtree.close(); |
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} |
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} |
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public void flush() throws IndexException { |
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flush(new File(quadtreeFile)); |
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} |
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public void flush(File f) throws IndexException { |
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byte order = 0; |
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if ((byteOrder == null) || byteOrder.equalsIgnoreCase("NM")) { |
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order = IndexHeader.NEW_MSB_ORDER; |
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} else if (byteOrder.equalsIgnoreCase("NL")) { |
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order = IndexHeader.NEW_LSB_ORDER; |
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} |
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FileSystemIndexStore store = new FileSystemIndexStore(f, order);
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try {
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store.store(quadtree); |
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this.quadtreeFile = f.getAbsolutePath();
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} catch (StoreException e) {
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throw new IndexException(e); |
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} |
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} |
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public void close() { |
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try {
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quadtree.close(); |
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} catch (StoreException e) {
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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} |
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} |
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public File getFile() { |
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return new File(this.quadtreeFile); |
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} |
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} |