demo.java

采用java实现的arcgis server程序

package demo;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import com.esri.adf.web.data.GISResource;
import com.esri.adf.web.data.WebContext;
import com.esri.adf.web.data.WebLayerInfo;
import com.esri.adf.web.data.WebMap;
import com.esri.adf.web.data.geometry.WebExtent;
import com.esri.adf.web.data.geometry.WebGeometry;
import com.esri.adf.web.data.query.IdentifyCriteria;
import com.esri.adf.web.data.query.QueryResult;
import com.esri.adf.web.data.query.WebQuery;
import com.esri.adf.web.data.results.WebResults;
import com.esri.adf.web.faces.event.MapEvent;
import com.esri.adf.web.faces.event.TaskEvent;

public class Demo {
	double zoomFactor = 0.6;
	
	public void select(MapEvent e) {
		//get the adf objects
		WebContext ctx = e.getWebContext();
		WebMap wmap = ctx.getWebMap();
		WebQuery wquery = ctx.getWebQuery();
		
		//get the screen geom
		WebGeometry screengeom = e.getWebGeometry();
		
		//convert to map geom
		WebExtent ext = (WebExtent)screengeom.toMapGeometry(wmap);
		
		//perform query and get results ***busy code***
		IdentifyCriteria ic = new IdentifyCriteria(ext);
		List layers = new ArrayList();
		layers.add(new WebLayerInfo(2, "Countries", (GISResource)ctx.getResources().get("world")));
		List results = wquery.query(ic, layers);
		
		//iterate thru and highlight each result
		wquery.clearGraphics();
		for (Iterator iter = results.iterator(); iter.hasNext();) {
			QueryResult r = (QueryResult) iter.next();
			r.highlight();
		}
		
		//get the WebResults object
		WebResults wresults = ctx.getWebResults();
		
		//use the verbose method to add results
		wresults.addResultsWithActionArray("Selected Countries: " + results.size(), 
				results,
				"getName", "getDetails",
				new String[] {"zoom", "highlight", "clearGraphic"});
	}
	
	public void zoom(TaskEvent e) {
		//get the webcontext and webmap
		WebContext ctx = e.getWebContext();
		WebMap wmap = ctx.getWebMap();
		
		//get the current ext
		WebExtent ext = wmap.getCurrentExtent();
		
		//expand the ext by the zoomFactor
		ext.expand(zoomFactor);
		
		//set the new ext
		wmap.setCurrentExtent(ext);
		
		//refresh the context
		ctx.refresh();
	}
	
	public Map getZoomFactors() {
		Map factors = new LinkedHashMap();
		for(int i = 1; i <= 10; i++) {
			Double factor = new Double(2d * i / 10);
			factors.put(factor, factor);
		}
		return factors;
	}
	
	public double getZoomFactor() {
		return zoomFactor;
	}

	public void setZoomFactor(double zoomFactor) {
		this.zoomFactor = zoomFactor;
	}
}