ControllerServlet.java

/*
*
* Copyright 2005 AgileTec s.r.l. (http://www.agiletec.it) All rights reserved.
*
* This file is part of jAPS software.
* jAPS is a free software; 
* you can redistribute it and/or modify it
* under the terms of the GNU General Public License (GPL) as published by the Free Software Foundation; version 2.
* 
* See the file License for the specific language governing permissions   
* and limitations under the License
* 
* 
* 
* Copyright 2005 AgileTec s.r.l. (http://www.agiletec.it) All rights reserved.
*
*/
package com.agiletec.aps.servlet;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

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

import com.agiletec.aps.system.ApsSystemUtils;
import com.agiletec.aps.system.RequestContext;
import com.agiletec.aps.system.SystemConstants;
import com.agiletec.aps.system.services.controller.ControllerManager;
import com.agiletec.aps.util.ApsWebApplicationUtils;

/**
 * Servlet di controllo, punto di ingresso per le richieste di pagine del portale.
 * Predispone il contesto di richiesta, invoca il controller e ne gestisce lo stato di uscita.
 * @author  
 */
public class ControllerServlet extends HttpServlet {
	
	@Override
	protected void service(HttpServletRequest request, HttpServletResponse response) 
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		RequestContext reqCtx = new RequestContext();
		Logger log = ApsSystemUtils.getLogger();
		if (log.isLoggable(Level.FINEST)) {
			log.finest("Request:" + request.getServletPath());
		}
		request.setAttribute(RequestContext.REQCTX, reqCtx);
		reqCtx.setRequest(request);
		reqCtx.setResponse(response);
		ControllerManager controller = 
			(ControllerManager) ApsWebApplicationUtils.getBean(SystemConstants.CONTROLLER_MANAGER, request);
		int status = controller.service(reqCtx);
		if (status == ControllerManager.REDIRECT) {
			if (log.isLoggable(Level.FINEST)) {
				log.finest("Redirezione");
			}
			this.redirect(reqCtx, response);
		} else if (status == ControllerManager.OUTPUT) {
			if (log.isLoggable(Level.FINEST)) {
				log.finest("Output");
			}
		} else if (status == ControllerManager.ERROR) {
			this.outputError(reqCtx, response);
			if (log.isLoggable(Level.FINEST)) {
				log.finest("Errore");
			}
		} else {
			log.severe("Errore: stato uscita controller = " 
					+ ControllerManager.getStatusDescription(status) 
					+ " per richiesta: ");
			log.severe(request.getServletPath());
			throw new ServletException("Servizio non disponibile");
		}
		return;
	}
	
	private void redirect(RequestContext reqCtx, HttpServletResponse response) throws ServletException {
		try {
			String url = (String) reqCtx.getExtraParam(RequestContext.EXTRAPAR_REDIRECT_URL);
			response.sendRedirect(url);
		} catch (Exception e) {
			throw new ServletException("Servizio non disponibile");
		}
	}
	
	private void outputError(RequestContext reqCtx, HttpServletResponse response)
			throws ServletException {
		try {
			if (!response.isCommitted()) {
				Integer httpErrorCode = (Integer) reqCtx.getExtraParam("errorCode");
				if (httpErrorCode == null) {
					httpErrorCode = new Integer(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
				}
				response.sendError(httpErrorCode.intValue());
			}
		} catch (IOException e) {
			ApsSystemUtils.logThrowable(e, this, "outputError");
			throw new ServletException("Servizio non disponibile");
		}
	}
	
}