Application: gvSIG desktop » gvSIG geoprocess

/*

 * 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.sextante.app.algorithm.base.core;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.gvsig.fmap.dal.DataSet;

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

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

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

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

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

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

import org.gvsig.fmap.dal.feature.impl.DefaultFeatureSelection;

/**

 * Each geometry operation have to inherit from this class.

 *  

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

 */

public abstract class GeometryOperation {

        protected DALFeaturePersister              persister          = null;

        protected FeatureStore                     inFeatureStore     = null;

        protected ArrayList<FeatureStore>          inFeatureStoreList = null;

        protected boolean                          selectedGeom       = false;

        protected int                              numberOfFeatures   = 0;

        /**

         * Invokes this operation and returns an EditableFeature

         * @param g

         * @param featureInput

         * @return

         */

        public abstract EditableFeature invoke(org.gvsig.fmap.geom.Geometry g, Feature featureInput);

        /**

         * Invokes this operation

         * @param g

         * @param featureInput

         */

        public abstract void invoke(org.gvsig.fmap.geom.Geometry g, EditableFeature featureInput);

        /**

         * Sets the output FeatureType and the input attributes for this feature

         * @param out

         * @throws DataException 

         */

        public abstract void setFeatureStore(FeatureStore out, String[] attrNames) throws DataException;

        /**

         * Gets the last result of this operation

         * @return

         */

        public abstract Object getResult();

        /**

         * 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("unchecked")

        public void computesGeometryOperation(FeatureStore inFeatStore,

                                                                        FeatureStore outFeatStore,

                                                                        String[] attrNames,

                                                                        boolean selectedGeom,

                                                                        boolean closeOutStore) throws DataException {

                this.inFeatureStore = inFeatStore;

                this.selectedGeom = selectedGeom;

                FeatureSet featuresSet = null;

                featuresSet = inFeatStore.getFeatureSet();

                if(outFeatStore != null)

                        setFeatureStore(outFeatStore, attrNames);

                DisposableIterator it = null;

                if(selectedGeom) {

                        DataSet ds = inFeatStore.getSelection();

                        it = ((DefaultFeatureSelection)ds).iterator();

                } else

                        it = featuresSet.iterator();

                numberOfFeatures = (int)featuresSet.getSize();

                while( it.hasNext() ) {

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

                        List geomList = feature.getGeometries();

                        if(geomList == null) {

                                org.gvsig.fmap.geom.Geometry geom = feature.getDefaultGeometry();

                                invoke(geom, feature);

                                continue;

                        }

                        Iterator<org.gvsig.fmap.geom.Geometry> itGeom = geomList.iterator();

                        boolean first = true;

                        EditableFeature editFeat = null;

                        while(itGeom.hasNext()) {

                                org.gvsig.fmap.geom.Geometry g = itGeom.next();

                                if(first) {

                                        editFeat = invoke(g, feature);

                                        first = false;

                                } else

                                        invoke(g, editFeat);

                        }

                }

                if(closeOutStore && persister != null)

                        persister.end();

        }

        /**

         * 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 feature.

         * @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

         */

        public void computesFeatureOperation(FeatureStore inFeatStore,

                                                                        FeatureStore outFeatStore,

                                                                        String[] attrNames,

                                                                        boolean selectedGeom,

                                                                        boolean closeOutStore) throws DataException {

                this.inFeatureStore = inFeatStore;

                this.selectedGeom = selectedGeom;

                FeatureSet featuresSet = null;

                featuresSet = inFeatStore.getFeatureSet();

                if(outFeatStore != null)

                        setFeatureStore(outFeatStore, attrNames);

                DisposableIterator it = null;

                if(selectedGeom) {

                        DataSet ds = inFeatStore.getSelection();

                        it = ((DefaultFeatureSelection)ds).iterator();

                } else

                        it = featuresSet.iterator();

                numberOfFeatures = (int)featuresSet.getSize();

                while( it.hasNext() ) {

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

                        invoke(null, feature);

                }

                if(closeOutStore && persister != null)

                        persister.end();

        }

        /**

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

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

         * @param inFeatStoreList

         *        Input FeatureStore list

         * @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

         */

        public void computesGeometryOperationInAList(ArrayList<FeatureStore> inFeatStoreList,

                                                                        FeatureStore outFeatStore,

                                                                        String[] attrNames,

                                                                        boolean selectedGeom,

                                                                        boolean closeOutStore) throws DataException {

                this.inFeatureStoreList = inFeatStoreList;

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

                        computesGeometryOperation(inFeatStoreList.get(i), 

                                                                                i == 0 ? outFeatStore : null, 

                                                                                attrNames, 

                                                                                selectedGeom, 

                                                                                false);

                }

                if(closeOutStore && persister != null)

                        persister.end();

        }

        /**

         * Ends the edition and closes the FeatureStore

         * @deprecated

         */

        public void end() {

                persister.end();

        }

}