package org.kuali.student.common.ui.server.gwt;
   
   import java.io.IOException;
   
   import javax.servlet.ServletOutputStream;
   import javax.servlet.http.HttpServlet;
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   
  import org.apache.log4j.Logger;
  import org.kuali.student.common.ui.client.util.ExportUtils;
  
  public class ExportDocumentDownload extends HttpServlet {
  
  	final Logger LOG = Logger.getLogger(ExportDocumentDownload.class);
  	private static final long serialVersionUID = 1L;
  
  	public void doGet(HttpServletRequest request, HttpServletResponse response) {
  		try {
  			// If PDF is generated to to temp file, read it
  			String exportId = request.getParameter("exportId");
  			String format = request.getParameter("format");
  			// Get from session the byte array that was cached by the GWT Servlet
  			byte[] bytes = (byte[]) request.getSession().getAttribute(exportId);
  
  			sendPDF(response, bytes, format);
  		} catch (Exception ex) {
  			// TODO Nina how must we handle exceptions here??
  			// do something here
  		}
  	}
  
  	void sendPDF(HttpServletResponse response, byte[] bytes, String format) throws IOException {
  		ServletOutputStream stream = response.getOutputStream();
  		if (format.equals(ExportUtils.PDF)) {
  			response.setContentType("application/pdf");
  			response.addHeader("Content-Type", "application/pdf");
  			response.addHeader("Content-Disposition", "inline; filename=export.pdf");
  			response.setContentLength((int) bytes.length);
  		} else if (format.equals(ExportUtils.XLS)) {
  			response.setContentType("application/xls");
  			response.addHeader("Content-Type", "application/xls");
  			response.addHeader("Content-Disposition", "inline; filename=export.xls");
  			response.setContentLength((int) bytes.length);   
  
  		} else {
  			response.setContentType("application/ms-word");
  			response.addHeader("Content-Type", "application/ms-word");
  			response.addHeader("Content-Disposition", "inline; filename=export.doc");
  			response.setContentLength((int) bytes.length);
  		}
  		stream.write(bytes);
  		stream.close();
  	}
  }