| gvSIG desktop 1

/*

 * Created on 05-mar-2006

 *

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

 *

 * Copyright (C) 2004 IVER T.I. and 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.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

*

* $Id: MergeVisitor.java 5628 2006-06-02 18:21:28Z azabala $

* $Log$

* Revision 1.2  2006-06-02 18:21:28  azabala

* *** empty log message ***

*

* Revision 1.1  2006/05/24 21:10:15  azabala

* primera version en cvs despues de refactoring orientado a crear un framework extensible de geoprocessing

*

* Revision 1.5  2006/03/23 21:05:11  azabala

* *** empty log message ***

*

* Revision 1.4  2006/03/17 19:53:34  azabala

* *** empty log message ***

*

* Revision 1.3  2006/03/14 18:32:46  fjp

* Cambio con LayerDefinition para que sea compatible con la definici?n de tablas tambi?n.

*

* Revision 1.2  2006/03/07 21:01:33  azabala

* *** empty log message ***

*

* Revision 1.1  2006/03/05 19:59:16  azabala

* *** empty log message ***

*

*

*/

package com.iver.cit.gvsig.geoprocess.merge.fmap;

import com.hardcode.gdbms.engine.values.Value;

import com.hardcode.gdbms.engine.values.ValueFactory;

import com.iver.cit.gvsig.fmap.DriverException;

import com.iver.cit.gvsig.fmap.core.IFeature;

import com.iver.cit.gvsig.fmap.core.IGeometry;

import com.iver.cit.gvsig.fmap.drivers.FieldDescription;

import com.iver.cit.gvsig.fmap.drivers.ITableDefinition;

import com.iver.cit.gvsig.fmap.edition.EditionException;

import com.iver.cit.gvsig.fmap.layers.FLayer;

import com.iver.cit.gvsig.fmap.layers.SelectableDataSource;

import com.iver.cit.gvsig.fmap.layers.layerOperations.AlphanumericData;

import com.iver.cit.gvsig.fmap.layers.layerOperations.VectorialData;

import com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor;

import com.iver.cit.gvsig.fmap.operations.strategies.VisitException;

import com.iver.cit.gvsig.geoprocess.core.fmap.FeatureFactory;

import com.iver.cit.gvsig.geoprocess.core.fmap.FeatureProcessor;

/**

 * Visits all features of a layer, in context of a 

 * merge geoprocess, and creates a new feature with the 

 * attributes equals to ITableDefinition specified

 * 

 * @author azabala

 *

 */

public class MergeVisitor implements FeatureVisitor {

        SelectableDataSource recordset;

        ITableDefinition definition;

        FeatureProcessor featureProcessor;

        public MergeVisitor(ITableDefinition schema,

                        FeatureProcessor processor){

                this.definition = schema;

                this.featureProcessor = processor;

        }

        public void visit(IGeometry g, int index) throws VisitException {

                if(g == null)

                        return;

                FieldDescription[] fields =

                        definition.getFieldsDesc();

                Value[] values = new Value[fields.length];

                for(int i = 0; i < fields.length; i++){

                        String fieldName = fields[i].getFieldName();

                        try {

                                int fieldIndex = recordset.getFieldIndexByName(fieldName);

                                if(fieldIndex == -1)

                                        values[i] = ValueFactory.createNullValue();

                                else{

                                        //we must to verify data type, not only field name

                                        int fieldType = fields[i].getFieldType();

                                        int recordsetType = recordset.getFieldType(fieldIndex);

                                        if(fieldType != recordsetType){

                                                values[i] = ValueFactory.createNullValue();

                                        }else{

                                                values[i] = recordset.getFieldValue(index, fieldIndex);

                                        }        

                                }

                        } catch (com.hardcode.gdbms.engine.data.driver.DriverException e) {

                                throw new VisitException("Error en merge al tratar de leer el atributo de un feature de una de las capas");

                        }

                }//for

                IFeature feature = FeatureFactory.createFeature(values, g);

                featureProcessor.processFeature(feature);

        }

        public void stop(FLayer layer) {

                featureProcessor.finish();

        }

        public boolean start(FLayer layer) {

                if(layer instanceof VectorialData && layer instanceof AlphanumericData){

                        try {

                                this.recordset = ((AlphanumericData)layer).getRecordset();

                                this.featureProcessor.start();

                        } catch (DriverException e) {

                                return false;

                        } catch (EditionException e) {

                                return false;

                        }

                        return true;

                }

                return false;

        }

        public String getProcessDescription() {

                return "Merging many layers";

        }

}