agsfilterfunctionality.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.web.ags.data;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import com.esri.adf.web.ags.data.AGSMapFunctionality;
import com.esri.adf.web.data.GISResource;
import com.esri.adf.web.data.WebLayerInfo;
import com.esri.arcgisws.LayerDescription;
import com.esri.solutions.jitk.web.data.IFilterFunctionality;

public class AGSFilterFunctionality implements IFilterFunctionality{
	private static final Logger _logger = LogManager.getLogger(AGSFilterFunctionality.class);
	private GISResource _resource = null;
	
	public void filter(WebLayerInfo wlInfo, String definitionExpression) {
		_logger.info("Setting definition expression: " + definitionExpression);
		
		LayerDescription layerDesc = getLayerDesc(wlInfo);
		
		if (layerDesc != null){
			layerDesc.setDefinitionExpression(definitionExpression);
			wlInfo.getResource().getWebContext().refresh();
		}
		else {
			_logger.error("LayerDescription is null, filter could not be set");
		}
	}

	//TODO: Add this feature back in once its needed
	//public WebLayerInfo[] getFilterLayers() {
	//	
	//	AGSMapResource agsMapResource = (AGSMapResource)_resource;
	//	AGSMapFunctionality agsMapFunc = (AGSMapFunctionality)(agsMapResource).getFunctionality("map");
	//	MapLayerInfo[] agsLayerInfos = agsMapFunc.getLayerInfos();
	//	return null;
	//}

	public GISResource getResource() {
		return _resource;
	}

	public void initFunctionality(GISResource resource) {
		_logger.debug("Initializing functionality");
		_resource = resource;
	}
	
	public void destroyFunctionality() {
		_logger.debug("Destroying functionality");
	}

	/**
	 * Obtain the layer description for the given layers
	 */
	private LayerDescription getLayerDesc(WebLayerInfo wlInfo) {
		int iLayerId = -1;
		WebLayerInfo webLayerInfo = wlInfo;
		
		if (webLayerInfo != null) {	
			iLayerId = webLayerInfo.getId();
			GISResource resource = webLayerInfo.getResource();
			
			AGSMapFunctionality agsMapFunc = (AGSMapFunctionality)resource.getFunctionality("map");
			
			LayerDescription[] arLayerDescs = agsMapFunc.getLayerDescriptions();
	        
	        for(int iIdx = 0; iIdx < arLayerDescs.length; iIdx++)  {
	        	if (arLayerDescs[iIdx].getLayerID() == iLayerId) {
	        		return arLayerDescs[iIdx];
	            }
	        }
		}	
		
        return null;
	}
}