Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

* 

* 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.

* 

*/

/*

* AUTHORS (In addition to CIT):

* 2009 {Iver T.I.}   {Task}

*/

package org.gvsig.app.eventtheme.dal.feature;

import java.util.Arrays;

import org.gvsig.fmap.dal.DataStore;

import org.gvsig.fmap.dal.DataTypes;

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

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

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

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

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

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

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

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

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

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.Geometry.SUBTYPES;

import org.gvsig.fmap.geom.Geometry.TYPES;

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

import org.gvsig.fmap.geom.primitive.Point;

import org.gvsig.tools.persistence.PersistenceException;

import org.gvsig.tools.persistence.PersistentState;

/**

 * This class implements a transformation for a events theme. The original 

 * {@link DataStore} have to have a couple of attributes, one with the X 

 * coordinate and the second one with the Y coordinate. The result of 

 * the transformation is a {@link DataStore} that has a new geometric 

 * attribute and its value is a point with the coordinates specified in 

 * the original {@link DataStore}. 

 * @author <a href="mailto:jpiera@gvsig.org">Jorge Piera</a>

 */

public class EventThemeTransform extends AbstractFeatureStoreTransform {

        private String xFieldName = null;

        private String yFieldName = null;

        private String geometryFieldName = null;

        private FeatureType originalFeatureType;

        private static final GeometryManager geometryManager = GeometryLocator.getGeometryManager();

        public EventThemeTransform() {

                super();

        }

        /**

         * This method initializes the transformation, sets the name of the parameters and 

         * sets the value of the {@link FeatureType} returned by the transformation. 

         * @param store

         * The original store. 

         * @param geometryFieldName

         * The field that contains the geometric attribute.

         * @param xFieldName

         * The field that contains the X coordinate.

         * @param yFieldName

         * The field that contains the Y coordinate.

         * @throws DataException

         */

        public void initialize(FeatureStore store, String geometryFieldName, String xFieldName, String yFieldName) throws DataException{

                setFeatureStore(store);

                this.xFieldName = xFieldName;

                this.yFieldName = yFieldName;

                if ((geometryFieldName == null) || (geometryFieldName.equals(""))){

                        this.geometryFieldName = "the_geom";

                }else{

                        this.geometryFieldName = geometryFieldName;

                }

                this.originalFeatureType = this.getFeatureStore()

                .getDefaultFeatureType();

                EditableFeatureType type = this.getFeatureStore().getDefaultFeatureType().getEditable();

                if (type.get(this.geometryFieldName) == null){

                        EditableFeatureAttributeDescriptor attributeDescriptor = type.add(this.geometryFieldName,  DataTypes.GEOMETRY);

                        attributeDescriptor.setGeometryType(TYPES.POINT);

                        attributeDescriptor.setGeometrySubType(SUBTYPES.GEOM2D);                        

                }

                type.setDefaultGeometryAttributeName(this.geometryFieldName);

                FeatureType[] types = new FeatureType[] { type.getNotEditableCopy() };

                setFeatureTypes(Arrays.asList(types), types[0]);

        }

        /* (non-Javadoc)

         * @see org.gvsig.fmap.dal.feature.FeatureStoreTransform#applyTransform(org.gvsig.fmap.dal.feature.Feature, org.gvsig.fmap.dal.feature.EditableFeature)

         */

        public void applyTransform(Feature source, EditableFeature target)

                        throws DataException {

                this.copySourceToTarget(source, target);

                Object x = source.get(xFieldName);

                Object y = source.get(yFieldName);

                Double dx = Double.valueOf(x.toString());

                Double dy = Double.valueOf(y.toString());

                try {                        

                        Point point = geometryManager.createPoint(dx, dy, SUBTYPES.GEOM2D);

                        target.set(geometryFieldName, point);

                        target.setDefaultGeometry(point);                                

                } catch (CreateGeometryException e) {

                        throw new org.gvsig.fmap.dal.feature.exception.CreateGeometryException(TYPES.POINT, SUBTYPES.GEOM2D, e);

                }                

        }

        /**

         * @param source

         * @param target

         */

        private void copySourceToTarget(Feature source, EditableFeature target) {

                FeatureAttributeDescriptor attr, attrTrg;

                FeatureType ftSrc = source.getType();

                FeatureType ftTrg = target.getType();

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

                        attr = ftSrc.getAttributeDescriptor(i);

                        if (ftTrg.getIndex(attr.getName()) > -1) {

                                try {

                                        target.set(attr.getName(), source.get(i));

                                } catch (IllegalArgumentException e) {

                                        attrTrg = ftTrg.getAttributeDescriptor(attr.getName());

                                        target.set(attrTrg.getIndex(), attrTrg.getDefaultValue());

                                }

                        }

                }

        }

        /* (non-Javadoc)

         * @see org.gvsig.fmap.dal.feature.FeatureStoreTransform#getSourceFeatureTypeFrom(org.gvsig.fmap.dal.feature.FeatureType)

         */

        public FeatureType getSourceFeatureTypeFrom(FeatureType targetFeatureType) {

                return this.originalFeatureType;

        }

        /* (non-Javadoc)

         * @see org.gvsig.fmap.dal.feature.FeatureStoreTransform#isTransformsOriginalValues()

         */

        public boolean isTransformsOriginalValues() {

                return true;

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.Persistent#saveToState(org.gvsig.tools.persistence.PersistentState)

         */

        public void saveToState(PersistentState state) throws PersistenceException {

                // TODO Auto-generated method stub

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.Persistent#setState(org.gvsig.tools.persistence.PersistentState)

         */

        public void setState(PersistentState state) throws PersistenceException {

                // TODO Auto-generated method stub

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.Persistent#loadFromState(org.gvsig.tools.persistence.PersistentState)

         */

        public void loadFromState(PersistentState state)

                        throws PersistenceException {

                // TODO Auto-generated method stub

        }

}