/*
 *    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.gml2.bindings;

import java.util.List;

import javax.xml.namespace.QName;

import org.geotools.gml2.GML;
import org.geotools.xml.AbstractComplexBinding;
import org.geotools.xml.ElementInstance;
import org.geotools.xml.Node;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.CoordinateSequence;
import com.vividsolutions.jts.geom.Envelope;


/**
 * Binding object for the type http://www.opengis.net/gml:BoxType.
 *
 * <p>
 *        <pre>
 *         <code>
 *  <complexType name="BoxType">
 *      <annotation>
 *          <documentation>         The Box structure defines an extent
 *              using a pair of coordinate tuples.       </documentation>
 *      </annotation>
 *      <complexContent>
 *          <extension base="gml:AbstractGeometryType">
 *              <sequence>
 *                  <choice>
 *                      <element ref="gml:coord" minOccurs="2" maxOccurs="2"/>
 *                      <element ref="gml:coordinates"/>
 *                  </choice>
 *              </sequence>
 *          </extension>
 *      </complexContent>
 *  </complexType>
 *
 *          </code>
 *         </pre>
 * </p>
 *
 * @generated
 *
 * @source $URL$
 */
public class GMLBoxTypeBinding extends AbstractComplexBinding {
    /**
     * @generated
     */
    public QName getTarget() {
        return GML.BoxType;
    }

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

    /**
     * <!-- begin-user-doc -->
     * This method returns an object of type
     * @link com.vividsolutions.jts.geom.Envelope.
     * <!-- end-user-doc -->
     *
     * @generated modifiable
     */
    public Object parse(ElementInstance instance, Node node, Object value)
        throws Exception {
        List coordinates = node.getChildren("coord");

        if (!coordinates.isEmpty() && (coordinates.size() == 2)) {
            Node n1 = (Node) coordinates.get(0);
            Node n2 = (Node) coordinates.get(1);
            Coordinate c1 = (Coordinate) n1.getValue();
            Coordinate c2 = (Coordinate) n2.getValue();

            return new Envelope(c1.x, c2.x, c1.y, c2.y);
        }

        if (!coordinates.isEmpty()) {
            throw new RuntimeException("Envelope can have only two coordinates");
        }

        if (node.getChild("coordinates") != null) {
            CoordinateSequence cs = (CoordinateSequence) node.getChild("coordinates").getValue();

            if (cs.size() != 2) {
                throw new RuntimeException("Envelope can have only two coordinates");
            }

            return new Envelope(cs.getX(0), cs.getX(1), cs.getY(0), cs.getY(1));
        }

        throw new RuntimeException("Could not find coordinates for envelope");
    }

    public Object getProperty(Object object, QName name)
        throws Exception {
        Envelope e = (Envelope) object;

        if (GML.coord.equals(name)) {
            return new Coordinate[] {
                new Coordinate(e.getMinX(), e.getMinY()), new Coordinate(e.getMaxX(), e.getMaxY())
            };
        }

        return null;
    }
}