package net.sourceforge.fenixedu.presentationTier.Action.manager;

import java.util.Enumeration;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sourceforge.fenixedu._development.LogLevel;

import org.apache.log4j.Logger;
import org.apache.struts.Globals;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.tiles.TilesUtilImpl;

/**
 * Reloads the Struts configuration files and associated plugins by
 * reinitializing the Struts' ActionServlet.
 * 
 * @author cfgi
 */
public class ReloadStrutsAction extends Action {
    private static final Logger logger = Logger.getLogger(ReloadStrutsAction.class);

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
	    throws Exception {
	ActionServlet servlet = getServlet();

	if (servlet == null) {
	    if (LogLevel.WARN) {
		logger.warn("action servlet is null, could not reload configuration");
	    }
	    return null;
	}

	servlet.destroy();

	// clear struts and tiles state
	ServletContext context = servlet.getServletContext();
	Enumeration names = context.getAttributeNames();
	while (names.hasMoreElements()) {
	    String name = (String) names.nextElement();

	    if (name.startsWith(Globals.REQUEST_PROCESSOR_KEY)) {
		context.removeAttribute(name);
	    }

	    if (name.startsWith(TilesUtilImpl.DEFINITIONS_FACTORY)) {
		context.removeAttribute(name);
	    }
	}

	try {
	    servlet.init();
	} catch (ServletException e) {
	    if (LogLevel.ERROR) {
		logger.error("could not reload configuration, please redeploy the application");
	    }
	    e.printStackTrace();
	}

	if (LogLevel.INFO) {
	    logger.info("reloaded configuration");
	}
	return null;
    }
}