/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *
 * $Id: PdfASServletContextListener.java,v 1.3 2006/10/31 08:22:04 wprinz Exp $
 */
package at.gv.egiz.pdfas.web;

import java.io.File;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;

import at.gv.egiz.pdfas.api.PdfAs;
import at.gv.egiz.pdfas.api.commons.Constants;
import at.gv.egiz.pdfas.api.internal.PdfAsInternal;
import at.gv.egiz.pdfas.web.helper.ApiHelper;
import at.gv.egiz.pdfas.web.helper.WebSettingsReader;
import at.knowcenter.wag.egov.egiz.exceptions.SettingsException;
import at.knowcenter.wag.egov.egiz.exceptions.WebException;

/**
 * The ServletContextListener is notified when the webapplication starts up and
 * shuts down.
 * 
 * <p>
 * Maintainance work is performed.
 * </p>
 * 
 * @author wprinz
 */
public class PdfASServletContextListener implements ServletContextListener {
   /**
    * The logger.
    */
   private static final Logger logger = Logger.getLogger(PdfASServletContextListener.class);

   /**
    * The servlet init parameter that may be used to declare the pdf-as
    * configuration folder. The init parameter may be set in web.xml or in
    * META-INF/context.xml resp. conf/Catalina/localhost/pdf-as.xml if deployed.
    */
   private final static String CONFIG_SERVLET_INIT_PARAMETER = "work-dir";

   /**
    * @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
    */
   public void contextInitialized(ServletContextEvent sce) {
      logger.info("PDF-AS Context init"); //$NON-NLS-1$

      String sysPropWorkdir = System.getProperty(Constants.CONFIG_DIR_SYSTEM_PROPERTY);
      String scWorkdir = sce.getServletContext().getInitParameter(CONFIG_SERVLET_INIT_PARAMETER);

      String work_dir;

      // search for system property
      if (!StringUtils.isEmpty(sysPropWorkdir)) {
         work_dir = sysPropWorkdir;
         logger.debug("Work-dir configuration via system property \""
               + Constants.CONFIG_DIR_SYSTEM_PROPERTY + "\" = \"" + sysPropWorkdir + "\".");

         // search for servlet parameter
      } else if (!StringUtils.isEmpty(scWorkdir)) {
         work_dir = scWorkdir;
         logger.debug("Work-dir configuration via servlet init parameter \""
               + CONFIG_SERVLET_INIT_PARAMETER + "\" = \"" + scWorkdir + "\".");

         // assume configuration to be located in webapp path
      } else {
         work_dir = sce.getServletContext().getRealPath("/");
         logger.info("PDF-AS work-dir not explicitely given. Assuming configuration is located in webapp folder \""
               + work_dir + "\".");
      }

      logger.info("PDF-AS configuration location = \"" + work_dir + "\"");

      // try
      // {
      //      logger.info("PDF-AS work directory = " + new File(work_dir).getCanonicalPath()); //$NON-NLS-1$
      //      logger.info("PDF-AS base directory = " + new File(base_dir).getCanonicalPath()); //$NON-NLS-1$
      // }
      // catch (IOException e)
      // {
      // e.printStackTrace();
      // }

      WebSettingsReader.initialize(work_dir);
      PdfAs pdfAs;
      try {
         pdfAs = ApiHelper.createApiObject(new File(WebSettingsReader.RESOURCES_PATH));
         sce.getServletContext().setAttribute(ApiHelper.PDF_AS_OBJECT, pdfAs);
      } catch (WebException e) {
         logger.error(e.getMessage(), e);
      }

      PdfAsInternal pdfAsInternal;
      try {
         pdfAsInternal = ApiHelper.createInternalApiObject();
         sce.getServletContext().setAttribute(ApiHelper.INTERNAL_PDF_AS_OBJECT, pdfAsInternal);
      } catch (WebException e) {
         logger.error(e.getMessage(), e);
      }

      try {
         WebSettingsReader.getInstance();
      } catch (SettingsException e) {
         logger.error(e.getMessage(), e);
      }

      WebSettingsReader.clearTemporaryDirectory();
   }

   /**
    * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
    */
   public void contextDestroyed(ServletContextEvent sce) {
      WebSettingsReader.clearTemporaryDirectory();
      logger.info("PDF-AS Context exit"); //$NON-NLS-1$
   }
}