Index: lams_learning/src/java/org/lamsfoundation/lams/learning/export/web/action/MainExportServlet.java
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RCS file: /usr/local/cvsroot/lams_learning/src/java/org/lamsfoundation/lams/learning/export/web/action/MainExportServlet.java,v
diff -u
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/export/web/action/MainExportServlet.java	12 Oct 2005 01:29:24 -0000	1.1
@@ -0,0 +1,186 @@
+/*
+ * Created on Oct 11, 2005
+ *
+ * TODO To change the template for this generated file go to
+ * Window - Preferences - Java - Code Style - Code Templates
+ */
+package org.lamsfoundation.lams.learning.export.web.action;
+
+import org.apache.log4j.Logger;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpServlet;
+
+import org.lamsfoundation.lams.tool.ToolAccessMode;
+import org.lamsfoundation.lams.util.WebUtil;
+import org.lamsfoundation.lams.util.FileUtil;
+import org.lamsfoundation.lams.util.FileUtilException;
+import org.lamsfoundation.lams.learning.export.ExportPortfolioException;
+import org.lamsfoundation.lams.learning.export.ExportPortfolioConstants;
+
+
+/**
+ * @author mtruong
+ *
+ * MainExportServlet is responsible for calling the main export url 
+ * which is in charge of calling all tools to output its portfolio.
+ * It is responsible for creating the temporary directory where
+ * all file output should be placed. It will connect to the main
+ * export url via HttpUrlConnection.
+ * At this moment, it is unsure where this page will forward to once 
+ * the files are generated. (Most likely, the online version of the
+ * export page, or forward to the download page, which zips up all 
+ * the exports and allows the user to download the zip file.
+ * 
+ */
+public class MainExportServlet extends HttpServlet {
+	
+	private static Logger log = Logger.getLogger(MainExportServlet.class);
+	
+	
+	protected void doPost(HttpServletRequest request, HttpServletResponse response)
+	throws ServletException, IOException {
+		doGet(request, response);
+	}
+	
+	protected void doGet(HttpServletRequest request, HttpServletResponse response)
+	throws ServletException, IOException, ExportPortfolioException{
+	
+		
+		String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath();
+		String url = basePath + "/exportPortfolio.do";
+		String urlWithParameters = null;
+		String mode = WebUtil.readStrParam(request, WebUtil.PARAM_MODE);
+		
+		//create the directory
+		if (createTemporaryDirectory(ExportPortfolioConstants.EXPORT_TMP_DIR))
+		{			
+		
+			if (mode.equals(ToolAccessMode.LEARNER.toString()))
+			{
+				urlWithParameters = WebUtil.appendParameterToURL(url, WebUtil.PARAM_MODE, ToolAccessMode.LEARNER.toString());	
+			}
+			else if (mode.equals(ToolAccessMode.TEACHER.toString()))
+			{
+				urlWithParameters = WebUtil.appendParameterToURL(url, WebUtil.PARAM_MODE, ToolAccessMode.TEACHER.toString());
+				urlWithParameters = WebUtil.appendParameterToURL(urlWithParameters, "lessonID", WebUtil.readStrParam(request, "lessonID"));
+			}
+			
+			writeResponseToFile(urlWithParameters, ExportPortfolioConstants.EXPORT_TMP_DIR, ExportPortfolioConstants.MAIN_EXPORT_FILENAME);
+		}
+		//forward somewhere
+		
+		
+		
+	}
+	
+	/**
+	 * Method taken from AbstractExportPortfolioServlet. Uses HttpUrlConnection to connect to the url,
+	 * and will save its contents in <code>directoryToStoreFile</code>.
+	 * 
+	 * @param urlToConnectTo The url in which the connection is to be made to
+	 * @param directoryToStoreFile The directory to store the html file
+	 * @param filename The filename of the HTML directory in which contents are to be saved to
+	 * @throws ExportPortfolioException
+	 */
+	private void writeResponseToFile(String urlToConnectTo, String directoryToStoreFile, String filename) throws ExportPortfolioException
+	{
+		String absoluteFilePath = directoryToStoreFile + File.separator + filename;
+		try
+		{
+			URL url = new URL(urlToConnectTo);
+			HttpURLConnection con = (HttpURLConnection)url.openConnection();
+			if ( log.isDebugEnabled() ) {
+				log.debug("A connection has been established with "+urlToConnectTo);
+			}
+			InputStream inputStream = con.getInputStream();
+			OutputStream outStream = new FileOutputStream(absoluteFilePath);
+			   
+			int c = -1;
+			while ((c = inputStream.read())!= -1)
+			{
+				outStream.write(c);
+			}
+			   
+			inputStream.close();
+			outStream.close(); 
+			if ( log.isDebugEnabled() ) {
+				log.debug("A connection to "+urlToConnectTo + " has been closed");
+			}
+		}
+		catch(MalformedURLException e)
+		{
+			throw new ExportPortfolioException("The URL given is invalid. ",e);
+		}
+		catch(FileNotFoundException e)
+		{
+			throw new ExportPortfolioException("The directory or file may not exist. ",e);
+		}
+		catch(IOException e)
+		{
+			throw new ExportPortfolioException("A problem has occurred while writing file. ", e);
+		}
+		
+	}
+	
+	/**
+	 * Creates the temporary export directory. Checks whether the directory already exists,
+	 * if so, it should delete that directory (? not sure if i want this function)
+	 * then it creates the directory.
+	 * @param directory The name of the directory to create
+	 * @return true if the directory has been created, false otherwise
+	 */
+	private boolean createTemporaryDirectory(String directory)
+	{
+		boolean created=false; 
+		if (FileUtil.directoryExist(directory))
+		{
+			//delete directory and create a new one
+			try
+			{
+				if (FileUtil.deleteDirectory(directory))
+				{
+					created = FileUtil.createDirectory(directory);
+				}
+				else
+				{
+					throw new ExportPortfolioException("Could not delete the temporary directory " + directory + ", please manually delete this directory in order to proceed.");
+				}
+				
+			}
+			catch(FileUtilException e)
+			{
+				throw new ExportPortfolioException("An error has occurred while trying to create the temporary directory for the export. Reason: ", e);
+			}
+		}
+		else
+		{
+			try
+			{		
+				created = FileUtil.createDirectory(directory);
+			}
+			catch(FileUtilException e)
+			{
+				throw new ExportPortfolioException("An error has occurred while trying to create the temporary directory for the export. Reason: ", e);
+			}
+					
+		}
+		return created;
+		
+		
+	}
+	
+
+}