Application: gvSIG desktop

/*

 * Created on 07-feb-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: DefinitionUtils.java 39584 2013-01-10 14:47:47Z fpuga $

* $Log$

* Revision 1.3  2007-03-06 16:47:58  caballero

* Exceptions

*

* Revision 1.2  2006/06/20 18:19:43  azabala

* refactorizaci?n para que todos los nuevos geoprocesos cuelguen del paquete impl

*

* Revision 1.1  2006/05/24 21:12:16  azabala

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

*

* Revision 1.6  2006/05/08 15:38:31  azabala

* converted private constant in public

*

* Revision 1.5  2006/03/26 20:03:31  azabala

* *** empty log message ***

*

* Revision 1.4  2006/03/14 18:32:46  fjp

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

*

* Revision 1.3  2006/02/19 20:56:07  azabala

* *** empty log message ***

*

* Revision 1.2  2006/02/17 16:34:00  azabala

* *** empty log message ***

*

* Revision 1.1  2006/02/09 15:59:48  azabala

* First version in CVS

*

*

*/

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

import java.util.ArrayList;

import java.util.List;

import com.hardcode.gdbms.driver.exceptions.ReadDriverException;

import com.hardcode.gdbms.engine.data.driver.DriverException;

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

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

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

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

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

/**

 * This class has utility methods to work with LayerDefinitions

 * @author azabala

 *

 * TODO By now only works with SHPLayerDefinition. Redesign to work

 * with any layer definition.

 */

public class DefinitionUtils {

        public static int NUM_DECIMALS = 5;

        /**

         * It builds a LayerDefinition from a LyrVect

         * @param datasource

         * @param shapeType

         * @return

         * @throws ReadDriverException

         * @throws DriverException

         * @throws com.iver.cit.gvsig.fmap.DriverException

         */

        public static SHPLayerDefinition createLayerDefinition(FLyrVect layer) throws ReadDriverException{

                SHPLayerDefinition solution = new SHPLayerDefinition();

                solution.setName(layer.getName());

                solution.setShapeType(layer.getShapeType());

                SelectableDataSource datasource = layer.getRecordset();

                FieldDescription[] fieldsDescription = datasource.getFieldsDescription();

                solution.setFieldsDesc(fieldsDescription);

                return solution;

        }

        public static int getDataTypeLength(int dataType){

                switch(dataType){

                case XTypes.NUMERIC:

                case XTypes.DOUBLE:

                case XTypes.REAL:

                case XTypes.FLOAT:

                case XTypes.BIGINT:

                case XTypes.INTEGER:

                case XTypes.DECIMAL:

                        return 20;

                case XTypes.CHAR:

                case XTypes.VARCHAR:

                case XTypes.LONGVARCHAR:

                        return 254;

                case XTypes.DATE:

                        return 8;

                case XTypes.BOOLEAN:

                case XTypes.BIT:

                        return 1;

                }

                return 0;

        }

        /**

         * Utility class to overlay geoprocess (that merges

         * layer definitions of many features)

         * @param firstLayer

         * @param secondLayer

         * @return

         * @throws ReadDriverException

         * @throws DriverException

         * @throws com.iver.cit.gvsig.fmap.DriverException

         */

        public static SHPLayerDefinition mergeLayerDefinitions(FLyrVect firstLayer,

                        FLyrVect secondLayer) throws ReadDriverException{

                SHPLayerDefinition solution = new SHPLayerDefinition();

                solution.setName(firstLayer.getName() + "-" + secondLayer.getName());

                solution.setShapeType(firstLayer.getShapeType());

                SelectableDataSource firstDatasource = firstLayer.getRecordset();

                SelectableDataSource secondDatasource = secondLayer.getRecordset();

                FieldDescription[] fields = 

                        new FieldDescription[firstDatasource.getFieldCount() + secondDatasource.getFieldCount()];

                int i = 0;

                for (FieldDescription fieldDesc:firstDatasource.getFieldsDescription()) {

                    fields[i++] = fieldDesc;

                }

                for (FieldDescription fieldDesc:secondDatasource.getFieldsDescription()) {

                    fields[i++] = fieldDesc;

                }

                solution.setFieldsDesc(fields);

                return solution;

        }

        /**

         * Tells if a FieldDescription is numeric

         * @param fieldDesc

         * @return

         */

        public static boolean isNumeric(FieldDescription fieldDesc){

                return XTypes.isNumeric(fieldDesc.getFieldType());

        }

        /**

         * Returns all numeric FieldDescriptions of a LayerDefinition

         * @param layerDef

         * @return

         */

        public static List getNumerics(ITableDefinition layerDef){

                ArrayList solution = new ArrayList();

                FieldDescription[] fields = layerDef.getFieldsDesc();

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

                        //java access to arrays is a consumption operation

                        FieldDescription field = fields[i];

                        if(DefinitionUtils.isNumeric(field)){

                                solution.add(field);

                        }

                }

                return solution;

        }

}