featurecounter.java

一个ARCGIS 地图应用

package com.intellegent;

import java.rmi.RemoteException;

import com.esri.adf.web.ags.ADFAGSException;
import com.esri.adf.web.ags.data.AGSMapResource;
import com.esri.adf.web.data.WebContext;
import com.esri.adf.web.data.WebMap;
import com.esri.adf.web.data.geometry.WebExtent;
import com.esri.adf.web.faces.event.MapEvent;
import com.esri.arcgisws.EnvelopeN;
import com.esri.arcgisws.EsriSearchOrder;
import com.esri.arcgisws.EsriSpatialRelEnum;
import com.esri.arcgisws.MapServerPort;
import com.esri.arcgisws.SpatialFilter;

public class FeatureCounter {

	private WebContext context;

	private int countedFeatures;

	
	public String countFeaturesInRectangle(MapEvent event) {
		//Get the chosen extent
		WebMap webMap = context.getWebMap();
		WebExtent chosenExent = (WebExtent) event.getWebGeometry()
				.toMapGeometry(webMap);
		//Delegate to countFeatures()
		this.countFeatures(chosenExent);
		//Don't want to navigate to another page
		return null;
	}

	public String countFeaturesInFullExtent() {
		//Get the full extent
		WebExtent fullExtent = context.getWebMap().getFullExtent();
		//Delegate to countFeatures()
		this.countFeatures(fullExtent);
		//Don't want to navigate to another page
		return null;
	}

	private void countFeatures(WebExtent extent) {
		// Get the MapServerPort so we can execute methods through ArcGIS Server API
		AGSMapResource agsMap = (AGSMapResource) context.getResources().get(
				"ags0");
		MapServerPort mapServer = agsMap.getMapServer();
		// Make a new envelope from the web extent
		EnvelopeN env = new EnvelopeN(extent.getMinX(), extent.getMinY(),
				extent.getMaxX(), extent.getMaxY(), null, null, null, null,
				null);

		// Setup a spatial filter for an Intersection relationship
		SpatialFilter spatialFilter = new SpatialFilter();
		spatialFilter
				.setSpatialRel(EsriSpatialRelEnum.esriSpatialRelIntersects);
		spatialFilter.setWhereClause("");
		spatialFilter.setSearchOrder(EsriSearchOrder.esriSearchOrderSpatial);
		spatialFilter.setSpatialRelDescription("");
		spatialFilter.setGeometryFieldName("");
		// Set the envelope as the geometry
		spatialFilter.setFilterGeometry(env);

		// MapServer::queryFeatureCount() executes on the server and can throw a
		// RemoteException
		try {
			// Count features in 4th layer which intersect with the envelope
			int layerId = 3;
			this.countedFeatures = mapServer.queryFeatureCount(mapServer
					.getDefaultMapName(), layerId, spatialFilter);
		} catch (RemoteException rme) {
			// Rethrow this as ADFAGSException so that it can participate in the
			// exception framework
			throw new ADFAGSException(
					"Could not execute MapServer::queryFeatureCount()", rme);
		}
	}

	public WebContext getContext() {
		return context;
	}

	public void setContext(WebContext context) {
		this.context = context;
	}

	public int getCountedFeatures() {
		return countedFeatures;
	}

	public void setCountedFeatures(int countedFeatures) {
		this.countedFeatures = countedFeatures;
	}
}