/src/edu/ucsb/nceas/metacat/MetaCatServlet.java - Diff - Metacat - Ecoinformatics Redmine

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Revision 943

Added by Jing Tao over 22 years ago

A new action named export was add to it. This action will export a zip output stream for a data package. In the zip output stream, meta data documents, data files and a html summary file are include. The stucture will looks like:
package----/metadata/metadata docments |
----/data/data files |
----html file

      * <p>Valid parameters are:<br>
      * action=query -- query the values of all elements and attributes
      *                     and return a result set of nodes<br>
      * action=squery -- structured query (see pathquery.dtd)<br>
      * action=squery -- structured query (see pathquery.dtd)<br>
      * action= -- export a zip format for data packadge<br>
      * action=read -- read any metadata/data file from Metacat and from Internet<br>
      * action=insert -- insert an XML document into the database store<br>
      * action=update -- update an XML document that is in the database store<br>
-...
         if (ctype != null && ctype.startsWith("multipart/form-data")) {
           handleMultipartForm(request, response);
         } else {
           // This probably means the data is "application/x-www-url-encoded", we hope :-)
           String name = null;
           String[] value = null;
-...
             handleQuery(response.getWriter(),params,response,username,groupnames);
           } else if(action.equals("squery")) {
             if(params.containsKey("query")) {
               handleSQuery(response.getWriter(),params,response,username,groupnames);
              handleSQuery(response.getWriter(),params,response,username,groupnames);
             } else {
               PrintWriter out = response.getWriter();
               out.println("Illegal action squery without \"query\" parameter");
+            }
           } else if (action.equals("export")) {
             //username and groupname have to continue using though they are
             //not standard
             handleExportAction(params, response, username, groupnames);
           } else if (action.equals("read")) {
             handleReadAction(params, response, username, groupnames);
           } else if (action.equals("insert") || action.equals("update")) {
-...
+      }
       // END OF SQUERY & QUERY SECTION
      //Exoport section
      /**
        * Handle the "export" request of data package from Metacat in zip format
        * @param params the Hashtable of HTTP request parameters
        * @param response the HTTP response object linked to the client
        * @param user the username sent the request
        * @param groups the user's groupnames
        */
       private void handleExportAction(Hashtable params,
                         HttpServletResponse response, String user, String[] groups)
+      {
         ServletOutputStream out = null;
         ZipOutputStream zOut = null;
         DocumentImpl docImpls=null;
         DBQuery queryObj=null;
         Connection conn = null;
         String[] docs = new String[10];
         String docId = "";
         try
+        {
           // read the params
           if (params.containsKey("docid")) {
             docs = (String[])params.get("docid");
+          }
           //get the connection to database
           conn = util.getConnection();
           queryObj = new DBQuery(conn, saxparser);//"saxparser" have to use though
                                                   //it is not standard
           docId=docs[0];
           out = response.getOutputStream();
           response.setContentType("application/zip"); //MIME type
           zOut = new ZipOutputStream(out);
           zOut =queryObj.getZippedPackage(docId, out, user, groups);
           zOut.finish(); //terminate the zip file
           zOut.close();  //close the zip stream
+        }
         catch (Exception e)
+        {
           try
+          {
             response.setContentType("text/xml"); //MIME type
             if (out != null)
+            {
                 PrintWriter pw = new PrintWriter(out);
                 pw.println("<?xml version=\"1.0\"?>");
                 pw.println("<error>");
                 pw.println(e.getMessage());
                 pw.println("</error>");
                 pw.close();
+            }
             if ( zOut != null )
+            {
               zOut.close();
+            }
+          }
           catch (IOException ioe)
+          {
             util.debugMessage("Problem with the servlet output " +
                                "in MetacatServlet.handleReadAction: " +
                                ioe.getMessage());
+          }
           util.debugMessage("Error in MetacatServlet.handleReadAction: " +
                              e.getMessage());
         }//catch
       }//handleExportAction
       // READ SECTION
       /**
        * Handle the "read" request of metadata/data files from Metacat
-...
       // read metadata or data from Metacat
       private void readFromMetacat(HttpServletResponse response, String docid,
                                    String qformat, String abstrpath, String user,
                                    String[] groups, boolean zip, ZipOutputStream zout)
                                  String[] groups, boolean zip, ZipOutputStream zout)
                    throws ClassNotFoundException, IOException, SQLException,
                           McdbException, Exception
+      {
-...
         try {
           // MBJ: need to put filesize limit in Metacat config (metacat.properties)
           MultipartParser mp = new MultipartParser(request, 200*1024*1024); // 200MB
           MultipartParser mp = new MultipartParser(request, 200*1024*1024); //200MB
           Part part;
           while ((part = mp.readNextPart()) != null) {
             String name = part.getName();
-...
             try {
               out = response.getWriter();
             } catch (IOException ioe2) {
               System.err.println("Fatal Error: couldn't get response output stream.");
               util.debugMessage("Fatal Error: couldn't get response "+
                                                                   "output stream.");
+            }
             out.println("<?xml version=\"1.0\"?>");
             out.println("<error>");

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Revision 943

Added by Jing Tao over 22 years ago