countfeatures.java

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/*
* Copyright 2006 ESRI
*
* All rights reserved under the copyright laws of the United States
* and applicable international laws, treaties, and conventions.
*
* You may freely redistribute and use this sample code, with or
* without modification, provided you include the original copyright
* notice and use restrictions.
* See use restrictions at /arcgis/java/samples/userestrictions.
*/

package com.esri.webadf.sample;

import java.rmi.RemoteException;

import com.esri.adf.web.ags.ADFAGSException;
import com.esri.adf.web.ags.data.AGSMapFunctionality;
import com.esri.adf.web.ags.data.AGSMapResource;
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.query.WebQuery;
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.LayerDescription;
import com.esri.arcgisws.MapServerPort;
import com.esri.arcgisws.SpatialFilter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.faces.model.SelectItem;

public class CountFeatures {

private WebContext webContext = null;
private int numberOfFeatures = -1;
private WebLayerInfo layer;
private AGSMapFunctionality mfunc = null;
private ArrayList layers = null;

public int getNumberOfFeatures() {
    return numberOfFeatures;
}

public WebContext getWebContext() {
    return webContext;
}

public void setWebContext(WebContext webContext) {
    this.webContext = webContext;
}

public String countInExtent(){
    WebMap webMap = webContext.getWebMap();
    WebExtent webExtent = webMap.getCurrentExtent();
    //this line is safe only because this is a single source application that has an AGS Source
    AGSMapResource agsMap = (AGSMapResource) webContext.getResources().get("ags1");
    goCount(webExtent, agsMap);
    //by returning null the JSF Navigation Handler returns to the originating page
    return null;
}

public void countInRectangle(MapEvent event){
    WebMap webMap = webContext.getWebMap();
    WebExtent webExtent = (WebExtent) event.getWebGeometry().toMapGeometry(webMap);
    //this line is safe only because this is a single source application that has an AGS Source
    AGSMapResource agsMap = (AGSMapResource) webContext.getResources().get("ags1");
    goCount(webExtent, agsMap);
}

private void goCount(WebExtent webExtent, AGSMapResource agsMap) {
    numberOfFeatures = 0;
    //Get the class that handles the SOAP transactions with the server
    MapServerPort mapServer = agsMap.getMapServer();
    //make a new envelope from the web extent
    EnvelopeN env = new EnvelopeN(webExtent.getMinX(), webExtent.getMinY(), webExtent.getMaxX(), webExtent.getMaxY(),
            null, null, null, null, null);
    // make a spatialfilter value object with the required parameters
    SpatialFilter spatialFilter = new SpatialFilter();
    spatialFilter.setFilterGeometry(env);
    spatialFilter.setSpatialRel(EsriSpatialRelEnum.esriSpatialRelIntersects);
    spatialFilter.setWhereClause("");
    spatialFilter.setSearchOrder(EsriSearchOrder.esriSearchOrderSpatial);
    spatialFilter.setSpatialRelDescription("");
    spatialFilter.setGeometryFieldName("");

    int layerId = -1;
    if (layer != null) layerId = layer.getId();
    //because queryFeatureCount is found on the MapServerPort the call to queryFeatureCount goes back
    //to the server which can throw an RemoteException
    try {
            if(layerId != -1)
               numberOfFeatures =  mapServer.queryFeatureCount(mapServer.getDefaultMapName(), layerId, spatialFilter);
            else {
               AGSMapFunctionality func = (AGSMapFunctionality)agsMap.getFunctionality("map");
               LayerDescription[] descs = func.getLayerDescriptions();
               for(int i = 0; i < descs.length; i++) {
                   numberOfFeatures += mapServer.queryFeatureCount(mapServer.getDefaultMapName(), descs[i].getLayerID(),spatialFilter);
               }
            }
    } catch (RemoteException e){
            //By rethrowing this as an ADFAGSException it can participate in the exception frameowork of the
            //ADF which will show root cause and be available in a message stack for your JSF page.
            throw new ADFAGSException("Unable to count features", e);

    }
}
public ArrayList getQueryLayers(){

    if (layers != null) return layers;
    layers = new ArrayList();
    WebQuery wQuery = this.webContext.getWebQuery();
    WebLayerInfo layerInfo = null;
    if (wQuery != null){
      List layerList = wQuery.getQueryLayers();
      for (Iterator iter = layerList.iterator(); iter.hasNext(); ) {
        Object item = (Object) iter.next();
        if (item instanceof WebLayerInfo){
          layerInfo = (WebLayerInfo)item;
          layers.add(new SelectItem(layerInfo, layerInfo.getName()));
        }
      }
    }
    return layers;
  }



public WebLayerInfo getLayer() {
    return layer;
}

public void setLayer(WebLayerInfo layer) {
    this.layer = layer;
}

}