/*
 *    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.filter.v1_0;

import org.picocontainer.MutablePicoContainer;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import javax.xml.namespace.QName;
import org.opengis.filter.FilterFactory;
import org.opengis.filter.expression.Expression;
import org.opengis.filter.expression.PropertyName;
import org.geotools.filter.Filters;
import org.geotools.xml.AbstractComplexBinding;
import org.geotools.xml.ElementInstance;
import org.geotools.xml.Node;


/**
 * Binding object for the type http://www.opengis.net/ogc:PropertyNameType.
 *
 * <p>
 *        <pre>
 *         <code>
 *  <xsd:complexType name="PropertyNameType">
 *      <xsd:complexContent mixed="true">
 *          <xsd:extension base="ogc:ExpressionType"/>
 *      </xsd:complexContent>
 *  </xsd:complexType>
 *
 *          </code>
 *         </pre>
 * </p>
 *
 * @generated
 *
 *
 * @source $URL$
 */
public class OGCPropertyNameTypeBinding extends AbstractComplexBinding {
    protected FilterFactory factory;

    public OGCPropertyNameTypeBinding(FilterFactory factory) {
        this.factory = factory;
    }

    /**
     * @generated
     */
    public QName getTarget() {
        return OGC.PropertyNameType;
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     *
     * @generated modifiable
     */
    public int getExecutionMode() {
        return AFTER;
    }

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

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     *
     * @generated modifiable
     */
    public void initialize(ElementInstance instance, Node node, MutablePicoContainer context) {
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     *
     * @generated modifiable
     */
    public Object parse(ElementInstance instance, Node node, Object value)
        throws Exception {
        Expression expression = (Expression) value;
        String xpath = Filters.asString(expression);

        //if null returned, assume empty string == default geometry
        if (xpath == null) {
            xpath = "";
        }

        return factory.property(xpath);
    }

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

        if (propertyName.getPropertyName() != null) {
            value.appendChild(document.createTextNode(propertyName.getPropertyName()));
        }

        return value;
    }
}