Application: gvSIG desktop » gvSIG geoprocess

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2012 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

/*

 * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2010 Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 */

package org.gvsig.geoprocess.algorithm.fusespatially;

import java.util.ArrayList;

import java.util.List;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.EditableFeature;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.FeatureSelection;

import org.gvsig.fmap.dal.feature.FeatureSet;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

import org.gvsig.geoprocess.algorithm.base.core.GeometryOperation;

import org.gvsig.geoprocess.algorithm.base.util.GeometryUtil;

import org.gvsig.geoprocess.lib.sextante.AbstractSextanteGeoProcess;

import org.gvsig.tools.dispose.DisposableIterator;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import com.vividsolutions.jts.geom.Geometry;

/**

 * Fuse spatially operation

 * @author <a href="mailto:nachobrodin@gmail.com">Nacho Brodin</a>

 */

public class FuseSpatiallyOperationFast extends GeometryOperation {

        private static Logger                                  logger                        = LoggerFactory.getLogger(FuseSpatiallyOperationFast.class.getName());

        private ArrayList<Element>               featureList        = null; 

        private String                           nameIdField        = null;

        private FeatureStore                     outFeatStoreTable  = null;

        class Element {

                public int                 id              = -1;

                public Feature             feat            = null;

                public List<Element>       overlapList     = new ArrayList<Element>();

                public boolean             insertedToJoin  = false;

                public Geometry            jtsGeom         = null;

        }

        public FuseSpatiallyOperationFast(AbstractSextanteGeoProcess process) {

                super(process);

                featureList = new ArrayList<Element>();

        }

        @Override

        public EditableFeature invoke(org.gvsig.fmap.geom.Geometry g,

                        Feature featureInput) {

                // TODO Auto-generated method stub

                return null;

        }

        @Override

        public void invoke(org.gvsig.fmap.geom.Geometry g,

                        EditableFeature featureInput) {

                // TODO Auto-generated method stub

        }

        /**

         * Computes a complete operation over the input FeatureStore. The result of this operation

         * is stored in the output FeatureStore. This method will call once for each geometry.

         * @param inFeatStore

         *        Input FeatureStore

         * @param outFeatStore

         *        Output FeatureStore

         * @param attrNames

         *        List of attributes to build the output feature store

         * @param selectedGeom

         *        If it is true only the selected geometries will be processed

         * @throws DataException

         */

        @SuppressWarnings("deprecation")

        public void computesGeometryOperation(FeatureStore inFeatStore,

                                                                        FeatureStore outFeatStore,

                                                                        FeatureStore outFeatStoreTable,

                                                                        String[] attrNames,

                                                                        String[] attrNamesTable,

                                                                        boolean selectedGeomInput,

                                                                        boolean selectedGeomOutput,

                                                                        String idField) throws DataException {

                this.outFeatStoreTable = outFeatStoreTable;

                this.nameIdField = idField;

                this.inFeatureStore = inFeatStore;

                this.selectedGeomInput = selectedGeomInput;

                this.selectedGeomOverlay = selectedGeomOutput;

                FeatureSet featuresSet = null;

                featuresSet = inFeatStore.getFeatureSet();

                setFeatureStore(outFeatStore, attrNames);

                DisposableIterator it = null;

                if(selectedGeomInput) {

            FeatureSelection ds = inFeatStore.getFeatureSelection();

            it = ds.iterator();

            numberOfFeatures = (int) ds.getSelectedCount();

                } else {

                        it = featuresSet.iterator();

                        numberOfFeatures = (int)featuresSet.getSize();

                }

        if (status != null && process != null) {

            status.setRangeOfValues(0, numberOfFeatures);

            process.setProgress(0, numberOfFeatures);

        }

        //Crear lista de elementos

                int iCount = 0;

                while( it.hasNext() && !process.getTaskMonitor().isCanceled()) {

                        Feature feat = (Feature)it.next();

                        Element el = new Element();

                        el.feat = feat;

                        el.id = iCount;

                        featureList.add(el);

            if (status != null && process != null) {

                status.setCurValue(iCount);

                process.setProgress(iCount, numberOfFeatures);

            }

                        iCount ++;

                }

                it.dispose();

                //Crear listas de solapes para cada feature

                iCount = 0;

                while (iCount < featureList.size() && !process.getTaskMonitor().isCanceled()) {

                        Element elem1 = featureList.get(iCount);

                        org.gvsig.fmap.geom.Geometry geom1 = elem1.feat.getDefaultGeometry();

                        elem1.jtsGeom = GeometryUtil.geomToJTS(geom1);

                        if (status != null && process != null) {

                status.setCurValue(iCount);

                process.setProgress(iCount, numberOfFeatures);

            }

                        for (int i = iCount + 1; i < featureList.size(); i++) {

                                Element elem2 = featureList.get(i);

                                org.gvsig.fmap.geom.Geometry geom2 = elem2.feat.getDefaultGeometry();

                                elem2.jtsGeom = GeometryUtil.geomToJTS(geom2);

                                if(elem1.jtsGeom.intersects(elem2.jtsGeom))        {

                                        elem1.overlapList.add(elem2);

                                        elem2.overlapList.add(elem1);

                                }

                        }

                        iCount ++;

                }

                //Se calculan las listas de geometrias a unir

                //Para cada feature se obtiene su lista de elementos que solapan y para 

                //cada elemento que solapa se obtiene su lista. Finalmente todas se unen y 

                //y se hace un insert de una feature nueva

                List<Geometry> listResult = new ArrayList<Geometry>();

                iCount = 0;

                int iFeat = 0;

                while (iCount < featureList.size() && !process.getTaskMonitor().isCanceled()) {

                        Element elem1 = featureList.get(iCount);

                        if (status != null && process != null) {

                status.setCurValue(iCount);

                process.setProgress(iCount, numberOfFeatures);

            }

                        if(!elem1.insertedToJoin) {

                                elem1.insertedToJoin = true;

                                listResult.clear();

                                try {

                                        insertInTable(outFeatStoreTable, elem1.feat, iFeat);

                                } catch (DataException e) {

                                        logger.info("Imposible insertar en la tabla", e);

                                }

                                listResult.add(elem1.jtsGeom);

                                buildListToJoin(listResult, elem1.overlapList, iFeat);

                                Geometry newGeom = computesUnion(listResult, elem1);

                                try {

                                        addFeatureToOutput(newGeom, elem1.feat, iFeat);

                                } catch (CreateGeometryException e) {

                                        logger.info("Error a?adiendo geometr?a", e);

                                } catch (DataException e) {

                                        logger.info("Error a?adiendo geometr?a", e);

                                }

                                iFeat ++;

                        }

                        iCount ++;

                }

                if(persister != null)

                        persister.end();

        }

        /**

         * Computes the union of the list of geometries

         * @param listResult

         * @param elem1

         * @return

         */

        private Geometry computesUnion(List<Geometry> listResult, Element elem1) {

                int splitValue = 500;

                Geometry newGeom = null;

                if(listResult.size() > splitValue) {

                        List<List<Geometry>> list = splitList(listResult, splitValue);

                        List<Geometry> result = new ArrayList<Geometry>();

                        for (int i = 0; i < list.size(); i++) {

                                Geometry aux = GeometryUtil.geometryUnion(list.get(i), elem1.feat.getDefaultGeometry().getGeometryType().getType());

                                result.add(aux);

                        }

                        for (int i = 0; i < result.size(); i++) {

                                newGeom = GeometryUtil.geometryUnion(result, elem1.feat.getDefaultGeometry().getGeometryType().getType());

                        }

                } else {

                        newGeom = GeometryUtil.geometryUnion(listResult, elem1.feat.getDefaultGeometry().getGeometryType().getType());        

                }

                return newGeom;

        }

        /**

         * Splits the array of geometries to compute its union because JTS cannot support

         * a lot of geometries

         * @param list

         * @param n

         * @return

         */

        private List<List<Geometry>> splitList(List<Geometry> list, int n) {

                int elements = (int)(list.size() / n);

                List<List<Geometry>> l = new ArrayList<List<Geometry>>();

                for (int i = 0; i < elements; i++) {

                        l.add(list.subList((i * n), (i * n) + n));

                }

                if(elements * n < list.size()) {

                        l.add(list.subList((elements * n), list.size()));

                }

                return l;

        }

        /**

         * Builds the union of all lists 

         * @param listResult

         * @param listToJoin

         */

        private void buildListToJoin(List<Geometry> listResult, List<Element> listToJoin, int reference) {

                for (int i = 0; i < listToJoin.size(); i++) {

                        Element elem = listToJoin.get(i);

                        if(!elem.insertedToJoin) {

                                elem.insertedToJoin = true;

                                buildListToJoin(listResult, elem.overlapList, reference);

                                try {

                                        insertInTable(outFeatStoreTable, elem.feat, reference);

                                } catch (DataException e) {

                                        logger.info("Imposible insertar en la tabla", e);

                                }

                                listResult.add(elem.jtsGeom);

                        }

                }

        }

        /**

         * Adds a feature to the output

         * @param newGeom

         * @param feat

         * @param newFeatID

         * @throws DataException

         * @throws CreateGeometryException

         */

        private void addFeatureToOutput(Geometry newGeom, 

                        Feature feat, 

                        int newFeatID) throws DataException, CreateGeometryException {

                //Si hay una tabla aparte esta capa solo lleva el id como referencia a la tabla de campos

                if(outFeatStoreTable != null) { 

                        lastEditFeature = persister.addFeature(newGeom, nameIdField, newFeatID);

                } else {

                        //Si no hay tabla se ponen todos los campos de la tabla de entrada

                        String[] fieldNames = persister.getFieldNamesWithoutGeom();

                        ArrayList<String> fields = new ArrayList<String>();

                        ArrayList<Object> values = new ArrayList<Object>();

                        fields.add(nameIdField);

                        values.add(newFeatID);

                        for (int j = 0; j < fieldNames.length; j++) {

                                Object obj = feat.get(fieldNames[j]);

                                if(obj != null && fieldNames[j].compareTo(nameIdField) != 0) {

                                        fields.add(fieldNames[j]);

                                        values.add(obj);

                                }

                        }

                        lastEditFeature = persister.addFeature(newGeom, fields, values);

                }

        }

        /**

         * Insert in the output table a new feature with the fields of the input feature. Moreover 

         * exists a field that is an identifier which is a reference to the fusion layer.

         * @param outFeatureStoreTable

         * @param f

         * @throws DataException

         */

        private void insertInTable(FeatureStore outFeatureStoreTable, Feature f, int reference) throws DataException {

                if(outFeatureStoreTable == null)

                        return;

                EditableFeature edFeat = outFeatureStoreTable.createNewFeature();

                edFeat.set(nameIdField, reference);

                FeatureAttributeDescriptor[] attrList = f.getType().getAttributeDescriptors();

                for (int j = 0; j < attrList.length; j++) {

                        if(attrList[j].getName().compareTo("GEOMETRY") != 0) {

                                edFeat.set(attrList[j].getName(), f.get(attrList[j].getName()));

                        }

                }

                outFeatureStoreTable.insert(edFeat);

        }

}