/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */
package org.geotools.gml3.bindings;

import javax.xml.namespace.QName;

import org.geotools.geometry.DirectPosition1D;
import org.geotools.geometry.DirectPosition2D;
import org.geotools.geometry.DirectPosition3D;
import org.geotools.gml3.GML;
import org.geotools.xml.AbstractComplexBinding;
import org.geotools.xml.ElementInstance;
import org.geotools.xml.Node;
import org.opengis.geometry.DirectPosition;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.vividsolutions.jts.geom.CoordinateSequence;
import com.vividsolutions.jts.geom.GeometryFactory;


/**
 * Binding object for the type http://www.opengis.net/gml:DirectPositionType.
 *
 * <p>
 *        <pre>
 *         <code>
 *  <complexType name="DirectPositionType">
 *      <annotation>
 *          <documentation>DirectPosition instances hold the coordinates for a position within some coordinate reference system (CRS). Since
 *                          DirectPositions, as data types, will often be included in larger objects (such as geometry elements) that have references to CRS, the
 *                          "srsName" attribute will in general be missing, if this particular DirectPosition is included in a larger element with such a reference to a
 *                          CRS. In this case, the CRS is implicitly assumed to take on the value of the containing object's CRS.</documentation>
 *      </annotation>
 *      <simpleContent>
 *          <extension base="gml:doubleList">
 *              <attributeGroup ref="gml:SRSReferenceGroup"/>
 *          </extension>
 *      </simpleContent>
 *  </complexType>
 *
 *          </code>
 *         </pre>
 * </p>
 *
 * @generated
 *
 *
 *
 * @source $URL$
 */
public class DirectPositionTypeBinding extends AbstractComplexBinding {
    GeometryFactory factory;

    public DirectPositionTypeBinding(GeometryFactory factory) {
        this.factory = factory;
    }

    /**
     * @generated
     */
    public QName getTarget() {
        return GML.DirectPositionType;
    }

    public int getExecutionMode() {
        return AFTER;
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     *
     * @generated modifiable
     */
    public Class getType() {
        return CoordinateSequence.class;
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     *
     * @generated modifiable
     */
    public Object parse(ElementInstance instance, Node node, Object value)
        throws Exception {
        CoordinateReferenceSystem crs = GML3ParsingUtils.crs(node);

        //double[] position = (double[]) value;
        Double[] position = (Double[]) value;
        DirectPosition dp = null;

        if (position.length < 2) {
            dp = (crs != null) ? new DirectPosition1D(crs) : new DirectPosition1D();
            dp.setOrdinate(0, position[0].doubleValue());
        } else if (position.length < 3 ){
            dp = (crs != null) ? new DirectPosition2D(crs) : new DirectPosition2D();
            dp.setOrdinate(0, position[0].doubleValue());
            dp.setOrdinate(1, position[1].doubleValue());
        } else {
        	dp = (crs != null) ? new DirectPosition3D(crs) : new DirectPosition3D();
            dp.setOrdinate(0, position[0].doubleValue());
            dp.setOrdinate(1, position[1].doubleValue());
            dp.setOrdinate(2, position[2].doubleValue());
        }

        return dp;
    }

    public Element encode(Object object, Document document, Element value)
        throws Exception {
        CoordinateSequence cs = (CoordinateSequence) object;

        StringBuffer sb = new StringBuffer();

        // assume either zero or one coordinate
        if (cs.size() >= 1) {
            int dim = cs.getDimension();
            for (int d = 0; d < dim; d++) {
                double v = cs.getOrdinate(0, d);
                if (Double.isNaN(v) && d > 1) {
                    continue;
                }

                // separator char is a blank
                sb.append(String.valueOf(v)).append(" ");
            }
            if (dim > 0) {
                sb.setLength(sb.length()-1);
            }
        }

        value.appendChild(document.createTextNode(sb.toString()));

        return value;
    }
}