Application: gvSIG desktop

import org.gvsig.tools.persistence.PersistentState;

/**

 * This transform adds a new attribute of type Geometry to the

 * point whose coordinates proceed from two numeric attributes from the

 * store, called xname, yname.

 *

	private FeatureStore store;

	private String geomName;

	private String yname;

	/**

	 * Empty default constructor

	 */

	public MyTransform() {

	}

	/**

	 * 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 void initialize(FeatureStore store, String geomName, String xname, String yname) throws DataException {

		// Initialize some data

		this.store = 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 = store.getDefaultFeatureType().getEditable();

		type.add(geomName, DataTypes.GEOMETRY);

	}

	/**

	 * 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

		GeometryFactory geomFactory = GeometryManager.getInstance().getGeometryFactory();

		Geometry geom = geomFactory.createPoint2D(

			source.getDouble(yname)

		);

		target.setGeometry(this.geomName, geom);

	public void setState(PersistentState state) throws PersistenceException {

	}

}