package com.ximple.io.dgn7;

import org.apache.log4j.Logger;

import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.Coordinate;

/**
 * ShapeElement
 *
 * @author Ulysses
 * @version 0.1
 * @since 2006/5/18 下午 03:08:43
 */
public class ShapeElement extends LineStringElement implements GeometryConverter
{
    private static final Logger logger = Logger.getLogger(ShapeElement.class);

    public ShapeElement(byte[] raw)
    {
        super(raw);
    }

    public Coordinate[] getVertices()
    {
        Coordinate[] result = super.getVertices();
        if ((result != null) && (result.length > 2))
        {
            boolean isClosed = result[0].equals2D(result[result.length - 1]);
            if (!isClosed)
            {
                double distance = result[0].distance(result[result.length - 1]);
                if (distance < 0.00210)
                {
                    result[result.length - 1] = new Coordinate(result[0]);
                } else
                {
                    logger.info("Shape is not closed. distance=" + distance);
                    logger.debug("result[0]=" + result[0].toString());
                    logger.debug("result[length - 1]=" + result[result.length - 1]);
                }
            }
        }

        return result;
    }

    public Geometry toGeometry(GeometryFactory factory)
    {
        try
        {
            LinearRing ring = factory.createLinearRing(this.getVertices());
            return factory.createPolygon(ring, null);
        } catch (IllegalArgumentException e)
        {
            logger.warn(e.getMessage(), e);
            return null;
        }
    }

    public static class ElementHandler extends Element.ElementHandler
    {
        private static ElementHandler instance = null;

        public ElementHandler()
        {
            super(ElementType.SHAPE);
        }

        public static IElementHandler getInstance()
        {
            if (instance == null)
            {
                instance = new ElementHandler();
            }

            return instance;
        }

        protected Element createElement(byte[] raw)
        {
            return new ShapeElement(raw);
        }
    }
}