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/*
 * Copyright (C) 2012 United States Government as represented by the Administrator of the
 * National Aeronautics and Space Administration.
 * All Rights Reserved.
 */

package gov.nasa.worldwind.ogc.kml;

import gov.nasa.worldwind.util.WWUtil;
import gov.nasa.worldwind.util.xml.*;

import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.XMLEvent;
import java.util.*;

/**
 * Represents the KML Change element and provides access to its contents.
 *
 * @author tag
 * @version $Id: KMLChange.java 1171 2013-02-11 21:45:02Z dcollins $
 */
public class KMLChange extends AbstractXMLEventParser implements KMLUpdateOperation
{
    protected List objects = new ArrayList();

    /**
     * Construct an instance.
     *
     * @param namespaceURI the qualifying namespace URI. May be null to indicate no namespace qualification.
     */
    public KMLChange(String namespaceURI)
    {
        super(namespaceURI);
    }

    @Override
    protected void doAddEventContent(Object o, XMLEventParserContext ctx, XMLEvent event, Object... args)
        throws XMLStreamException
    {
        if (o instanceof KMLAbstractObject)
            this.addObject((KMLAbstractObject) o);
        else
            super.doAddEventContent(o, ctx, event, args);
    }

    protected void addObject(KMLAbstractObject o)
    {
        this.objects.add(o);
    }

    public List getObjects()
    {
        return this.objects;
    }

    public void applyOperation(KMLRoot targetRoot)
    {
        for (KMLAbstractObject sourceValues : this.objects)
        {
            String targetId = sourceValues.getTargetId();
            if (WWUtil.isEmpty(targetId))
                continue;

            Object o = targetRoot.getItemByID(targetId);
            if (o == null || !(o instanceof KMLAbstractObject))
                continue;

            KMLAbstractObject objectToChange = (KMLAbstractObject) o;

            objectToChange.applyChange(sourceValues);
        }
    }
}