Android中对于Geometry对象的字符串化

package com.esri.geometry.utils;

import com.esri.core.geometry.Envelope;
import com.esri.core.geometry.Geometry;
import com.esri.core.geometry.MultiPath;
import com.esri.core.geometry.Point;
import com.esri.core.geometry.Polygon;
import com.esri.core.geometry.Polyline;

public class GeometryUtils {
	
	/**
	 * 将几何对象生成wkt字符串	
	 */
	public static String GeometryToWKT(Geometry geometry){		
		if(geometry == null){
			return null;
		}
		String geoStr = "";
		Geometry.Type type = geometry.getType();
		if("Point".equals(type.name())){			
			Point pt = (Point)geometry;
			geoStr = type.name()+"("+pt.getX() +" "+pt.getY()+")";			
		}else if("Polygon".equals(type.name()) || "Polyline".equals(type.name())){
			MultiPath pg = (MultiPath)geometry;
			geoStr = type.name()+"("+"";
				int pathSize = pg.getPathCount();
			for(int j=0;j<pathSize;j++){
				String temp = "(";
				int size = pg.getPathSize(j);				
				for(int i=0;i<size;i++){					
					Point pt = pg.getPoint(i);
					temp +=pt.getX() +" "+pt.getY()+",";
				}
				temp = temp.substring(0, temp.length()-1)+")";
				geoStr +=temp+",";
			}
			geoStr = geoStr.substring(0, geoStr.length()-1)+")";
		}else if("Envelope".equals(type.name())){
			Envelope env = (Envelope)geometry;
			geoStr = type.name()+"("+ env.getXMin() +","+env.getYMin()+","+env.getXMax()+","+env.getYMax()+")";			
		}else if("MultiPoint".equals(type.name())){			
		}else{
			geoStr = null;
		}		
		return geoStr;
	}

	
	/**
	 * 将wkt字符串拼成几何对象	 
	 */
	public static Geometry WKTToGeometry(String wkt){
		Geometry geo = null;
		if(wkt == null || wkt.equals("")){
			return null;
		}
		String headStr = wkt.substring(0, wkt.indexOf("("));
		String temp = wkt.substring(wkt.indexOf("(")+1, wkt.lastIndexOf(")"));
		if(headStr.equals("Point")){
			String[] values = temp.split(" ");
			geo = new Point(Double.valueOf(values[0]),Double.valueOf(values[1]));
		}else if(headStr.equals("Polyline") || headStr.equals("Polygon")){
			geo = parseWKT(temp,headStr);
		}else if(headStr.equals("Envelope")){
			String[] extents = temp.split(",");			
	geo = new Envelope(Double.valueOf(extents[0]),Double.valueOf(extents[1]),Double.valueOf(extents[2]),Double.valueOf(extents[3]));
		}else if(headStr.equals("MultiPoint")){			
		}else{
			return null;
		}
		return geo;
	}		
	private static Geometry parseWKT(String multipath,String type){
		String subMultipath = multipath.substring(1, multipath.length()-1);
		String[] paths;
		if(subMultipath.indexOf("),(") >=0 ){			
			paths = subMultipath.split("),(");//多个几何对象的字符串
		}else{
			paths = new String[]{subMultipath};
		}
		Point startPoint = null;
		MultiPath path = null ;
		if(type.equals("Polyline")){
			path = new Polyline();
		}else{
			path = new Polygon();
		}		
		for(int i=0;i<paths.length;i++){
			String[] points = paths[i].split(",");
			startPoint = null;
			for(int j=0;j<points.length;j++){				
				String[] pointStr = points[j].split(" ");
				if(startPoint == null){
					startPoint = new Point(Double.valueOf(pointStr[0]),Double.valueOf(pointStr[1]));
					path.startPath(startPoint);
				}else{					
					path.lineTo(new Point(Double.valueOf(pointStr[0]),Double.valueOf(pointStr[1])));
				}				
			}			
		}
		return path;
	}


}