Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 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 3

 * 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.

 */

package org.gvsig.fmap.dal.store.dbf;

import java.util.ArrayList;

import java.util.List;

import org.gvsig.fmap.dal.DataTypes;

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

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

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

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

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

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

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

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

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

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

import org.gvsig.tools.persistence.PersistentState;

import org.gvsig.tools.persistence.exception.PersistenceException;

public class MyTransform extends AbstractFeatureStoreTransform {

    private String geomName;

        private String xname;

        private String yname;

    private GeometryManager geomManager;

        /**

         * A default constructor with out parameters

         */

        public MyTransform() {

                this.geomManager = GeometryLocator.getGeometryManager();

        }

        /**

         * Initializes the transform by assigning the source store and the names of

         * the necessary attributes.

         *

         * @param store

         *            source store.

         *

         * @param geomName

         *            name of the geometry attribute in the default feature type

         *            from the source store.

         *

         * @param xname

         *            name of the attribute containing the X coordinates

         *

         * @param yname

         *            name of the attribute containing the Y coordinates

         *

         * @throws DataException

         */

        public MyTransform initialize(FeatureStore store, String geomName,

                        String xname, String yname) throws DataException {

                // Initialize some data

                setFeatureStore(store);

                this.geomName = geomName;

                this.xname = xname;

                this.yname = yname;

                // obtain the feature type, add the new attribute

                // and keep a reference to the

                // resulting feature type

                EditableFeatureType type = getFeatureStore().getDefaultFeatureType()

                                .getEditable();

                type.add(geomName, DataTypes.GEOMETRY);

                List list = new ArrayList(1);

                list.add(type.getNotEditableCopy());

                setFeatureTypes(list, (FeatureType) list.get(0));

                return this;

        }

        /**

         * Applies this transform to a target editable feature, using data from the

         * source feature.

         */

        public void applyTransform(Feature source, EditableFeature target)

                        throws DataException {

                // copy source feature data over target feature

                target.copyFrom(source);

                // calculate and assign new attribute's value

                Geometry geom;

                try {

                        geom = geomManager.createPoint(source.getDouble(xname), source

                                        .getDouble(yname), Geometry.SUBTYPES.GEOM2D);

                } catch (CreateGeometryException e) {

                        throw new XYTransformException(e);

                }

                target.setGeometry(this.geomName, geom);

        }

        public class XYTransformException extends DataException {

            private final static String MESSAGE_FORMAT = "Problems apply XYTransform, can't create point.";

            private final static String MESSAGE_KEY = "_XYTransformException";

            private static final long serialVersionUID = -3556249688758572523L;

            public XYTransformException(Throwable cause) {

                    super(MESSAGE_FORMAT, cause, MESSAGE_KEY, serialVersionUID);

            }

        }

    public void saveToState(PersistentState state) throws PersistenceException {

                state.set("xname", xname);

                state.set("yname", yname);

                state.set("geomName", geomName);

        }

    public void loadFromState(PersistentState state)

                        throws PersistenceException {

                this.xname = state.getString("xname");

                this.yname = state.getString("yname");

                this.geomName = state.getString("geomName");

        }

    /**

         * Returns the FeatureType to use to get data from original store

         */

        public FeatureType getSourceFeatureTypeFrom(FeatureType targetFeatureType) {

                EditableFeatureType ed = targetFeatureType.getEditable();

                ed.remove(this.geomName);

                return ed.getNotEditableCopy();

        }

        /**

         * Informs that original values of store don't will be modified

         */

        public boolean isTransformsOriginalValues() {

                return false;

        }

}