多边形自相交处理-selfIntersection

	今天测试提了一个自相交空间查询的bug，用自相交的多边形查询资源点查不到结果。但是用postgis是可以查询出来的，看了一下postgis的处理方式，wkt字符串转为geometry之后会调用makeValid方法，如果是一个自相交的多边形POLYGON((0 0, 0 100, 100 100, 100 0, 0 0))，它会转换成一个MULTIPOLYGON(((0 0, 0 100, 100 100, 100 0, 0 0)),((50 50, 50 150, 150 150, 150 50, 50 50)))，就是说自相交的polygon被转成multiPolygonbn。但是这个是数据库处理的，后来想想geotools有没有对应的处理方法，网上搜索到一个高人写的方法：http://stackoverflow.com/questions/31473553/is-there-a-way-to-convert-a-self-intersecting-polygon-to-a-multipolygon-in-jts，很好的解决了这个问题。

/**
 * Get / create a valid version of the geometry given. If the geometry is a polygon or multi polygon, self intersections /
 * inconsistencies are fixed. Otherwise the geometry is returned.
 * 
 * @param geom
 * @return a geometry 
 */
public static Geometry validate(Geometry geom){
    if(geom instanceof Polygon){
        if(geom.isValid()){
            geom.normalize(); // validate does not pick up rings in the wrong order - this will fix that
            return geom; // If the polygon is valid just return it
        }
        Polygonizer polygonizer = new Polygonizer();
        addPolygon((Polygon)geom, polygonizer);
        return toPolygonGeometry(polygonizer.getPolygons(), geom.getFactory());
    }else if(geom instanceof MultiPolygon){
        if(geom.isValid()){
            geom.normalize(); // validate does not pick up rings in the wrong order - this will fix that
            return geom; // If the multipolygon is valid just return it
        }
        Polygonizer polygonizer = new Polygonizer();
        for(int n = geom.getNumGeometries(); n-- > 0;){
            addPolygon((Polygon)geom.getGeometryN(n), polygonizer);
        }
        return toPolygonGeometry(polygonizer.getPolygons(), geom.getFactory());
    }else{
        return geom; // In my case, I only care about polygon / multipolygon geometries
    }
}

/**
 * Add all line strings from the polygon given to the polygonizer given
 * 
 * @param polygon polygon from which to extract line strings
 * @param polygonizer polygonizer
 */
static void addPolygon(Polygon polygon, Polygonizer polygonizer){
    addLineString(polygon.getExteriorRing(), polygonizer);
    for(int n = polygon.getNumInteriorRing(); n-- > 0;){
        addLineString(polygon.getInteriorRingN(n), polygonizer);
    }
}

/**
 * Add the linestring given to the polygonizer
 * 
 * @param linestring line string
 * @param polygonizer polygonizer
 */
static void addLineString(LineString lineString, Polygonizer polygonizer){

    if(lineString instanceof LinearRing){ // LinearRings are treated differently to line strings : we need a LineString NOT a LinearRing
        lineString = lineString.getFactory().createLineString(lineString.getCoordinateSequence());
    }

    // unioning the linestring with the point makes any self intersections explicit.
    Point point = lineString.getFactory().createPoint(lineString.getCoordinateN(0));
    Geometry toAdd = lineString.union(point); 

    //Add result to polygonizer
    polygonizer.add(toAdd);
}

/**
 * Get a geometry from a collection of polygons.
 * 
 * @param polygons collection
 * @param factory factory to generate MultiPolygon if required
 * @return null if there were no polygons, the polygon if there was only one, or a MultiPolygon containing all polygons otherwise
 */
static Geometry toPolygonGeometry(Collection polygons, GeometryFactory factory){
    switch(polygons.size()){
        case 0:
            return null; // No valid polygons!
        case 1:
            return polygons.iterator().next(); // single polygon - no need to wrap
        default:
            return factory.createMultiPolygon(polygons.toArray(new Polygon[polygons.size()])); // multiple polygons - wrap them
    }
}