extenthistoryresetter.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.common.geometry;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import com.esri.adf.web.data.ExtentHistory;
import com.esri.adf.web.data.WebContext;

public class ExtentHistoryResetter {
	private static final Logger logger = LogManager.getLogger(ExtentHistoryResetter.class);
	
	public static void resetHistory(WebContext webCtx) {
        try {
            logger.info("Reseting extent history");
            ExtentHistory exHist = (ExtentHistory) webCtx.getAttribute("history");
            exHist.destroy();
            exHist = null;
            exHist = new ExtentHistory();
            exHist.init(webCtx);
            webCtx.setAttribute("history", exHist);
        }
        catch (Exception ex) {
        	logger.warn("Failed to reset extent history", ex);
        }		
	}
}