wfsquerycriteria.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.web.wfs.data.query;

import java.util.List;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import com.esri.adf.web.data.GISResource;
import com.esri.adf.web.data.WebLayerInfo;
import com.esri.adf.web.data.geometry.WebSpatialReference;
import com.esri.adf.web.data.query.QueryFunctionality;
import com.esri.solutions.jitk.datasources.ogc.wfs.CoordinateReferenceSystem;
import com.esri.solutions.jitk.datasources.ogc.wfs.FeatureTypeDescription;
import com.esri.solutions.jitk.datasources.ogc.wfs.IWFSClient;
import com.esri.solutions.jitk.datasources.ogc.wfs.WFSClient;
import com.esri.solutions.jitk.web.wfs.data.WFSMapResource;
import com.esri.solutions.jitk.web.wfs.data.WFSWebLayerInfo;

public abstract class WFSQueryCriteria {
	private static final Logger _logger = LogManager.getLogger(WFSQueryCriteria.class);
	
	public WFSQueryCriteria() {
	}
	
	protected WFSWebLayerInfo getWFSWeblayerInfo(QueryFunctionality qf, List<? extends WebLayerInfo> layerList) {
		WFSWebLayerInfo layerInfo = null;
		
		if (layerList == null) {
			_logger.error("WebLayerInfo list is null, aborting query");
			return layerInfo;
		}		
		
		if (layerList.size() != 1) {
			_logger.warn("WebLayerInfo list has " + layerList.size() + " layers. Using only first layer.");
			_logger.warn("WFSQueryFunctionality only supports querying one layer at a time");
		}		
		
		int iLayerId = layerList.get(0).getId();
		_logger.debug("Layer ID = " + iLayerId);
		GISResource gisResource = qf.getResource();		
		
		if (gisResource instanceof WFSMapResource) {
			WFSMapResource wfsResource = (WFSMapResource) gisResource;
			layerInfo = wfsResource.getLayerInfoByIndex(iLayerId);
		} else {
			_logger.error("GISResource not a WfsMapResource, aborting query");
		}
		
		return layerInfo;
	}
	
	protected CoordinateReferenceSystem getCrs(WebSpatialReference wsr, FeatureTypeDescription ftd) {
		WebSpatialReference spatRef = wsr;
		String mapSpatRef = String.valueOf(spatRef.getId());
		
		_logger.debug("Maps spatial reference def string " + spatRef.getDefinitionString());
		_logger.debug("Maps spatial reference ID is " + mapSpatRef);
		
		int spatRefId = spatRef.getId();
		
		if (spatRefId <= -1) {
			spatRefId = WebSpatialReference.getWebSpatialReferenceId(spatRef.getDefinitionString());
		}
		
		_logger.debug("Map calculated reference ID is " + spatRefId);
		CoordinateReferenceSystem crs = ftd.getOtherSrsFromCode(String.valueOf(spatRefId));
		
		if (crs == null) {
			_logger.error("WFS service does not support spatial reference ID " + spatRefId);
		} else {
			_logger.debug("WFS maps ID " + spatRefId + " to " + crs.getURNFormat());
		}
		
		return crs;
	}
	
	protected IWFSClient getWFSClient(GISResource gisResource) {
		// Get WFS end-point URL
		WFSMapResource mapResource = (WFSMapResource) gisResource;
		String url = mapResource.getEndPointURL();
		IWFSClient wfs = new WFSClient(url);
		
		return wfs;
	}
}