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

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Revision 370

Added by berkley over 23 years ago

- created transformResultset() which transforms an xml resultset document and displays it to the client useing DBTransform
- renamed transformDocument() to createResultDocument() and modified its functionality to only return a restultset xml document
- changed handleSQuery() and handleQuery() to use the new methods

      */
     public class MetaCatServlet extends HttpServlet {
       private ServletConfig		config = null;
       private ServletContext	context = null;
       private Hashtable 		connectionPool = new Hashtable();
       private String 		resultStyleURL = null;
       private String 		xmlcatalogfile = null;
       private String 		saxparser = null;
       private String        defaultdatapath = null;
       private String        servletpath = null;
       private String        htmlpath = null;
       private ServletConfig config = null;
       private ServletContext context = null;
       private Hashtable connectionPool = new Hashtable();
       private String resultStyleURL = null;
       private String xmlcatalogfile = null;
       private String saxparser = null;
       private String defaultdatapath = null;
       private String servletpath = null;
       private String htmlpath = null;
     					// path to directory where data files
     					// that can be downloaded will be stored
       private String        executescript  = null;
       private String executescript  = null;
     					// script to get data file and put it
                         // in defaultdocpath dir
       private PropertyResourceBundle options = null;
-...
+        }
     // End of Jivka added
         try
+        {
           Class[] x = {Class.forName("PrintWriter"),
                        Class.forName("Hashtable"),
                        Class.forName("HttpServletResponse")};
           Class c = Class.forName("edu.ucsb.nceas.metacat.MetaCatServlet");
           Method m = c.getDeclaredMethod("handleQueryAction", x);
+        }
         catch(Exception e)
+        {
+        }
         if(action.equals("query"))
+        {
           handleQuery(out, params, response);
-...
                 out.println("<error>");
                 out.println("SRB Connection failed. " + re.getMessage());
                 out.println("</error>");
+        }
+      }
       /**
         *Create the squery xml and return it as a String.
+        }
+      }
       /**
         *Create the squery xml, execute it and display it
         * @param out is the output stream to the client
         * @param params is the Hashtable of parameters that should be included
         * in the squery.
         * @param response is the response object linked to the client
         * @param conn the database connection
         */
       private void handleSQuery(PrintWriter out, Hashtable params,
                                 HttpServletResponse response)
+      {
       private void handleSQuery(PrintWriter out, Hashtable params,
                                 HttpServletResponse response)
+      {
         //create the squery and return it to be processed
         String doctype = null;
         String[] doctypeArr = null;
         Connection conn = null;
         doctypeArr = (String[])params.get("doctype");
         doctype = null;
         if (doctypeArr != null)
-...
+        }
         String xmlquery = DBQuery .createSQuery(params, doctype);
         Hashtable doclist = runQuery(xmlquery);
         String qformat = ((String[])params.get("qformat"))[0];
         transformDocument(doclist, qformat, xmlquery, out, response);
         String qformat = ((String[])params.get("qformat"))[0];
         String resultdoc = createResultDocument(doclist, qformat, xmlquery,
                                                 out, response);
         if(qformat.equals("html"))
+        {
           transformResultset(resultdoc, response, out);
+        }
         else if(qformat.equals("xml"))
+        {
           response.setContentType("text/xml");
           out.println(resultdoc);
+        }
         else
+        {
           out.println("invalid qformat: " + qformat);
+        }
         //conn.close();
+      }
        /**
         *Create the query xml and return it as a String.
         * @param query is the free text query parameter returned through the CGI.
         * @param doctype is the doctype parameter returned through the CGI.
         * If no doctype filter is required, set it to null or "".
         */
         *Create the xml query, execute it and display the results.
         * @param out is the output stream to the client
         * @param params is the Hashtable of parameters that should be included
         * in the squery.
         * @param response is the response object linked to the client
         */
       private void handleQuery(PrintWriter out, Hashtable params,
                                HttpServletResponse response)
+      {
         String doctype=null;
         String[] doctypeArr=null;
         String query=null;
         Connection conn = null;
         if(params.containsKey("query"))
+        {
         { //get the query parameter
           query = ((String[])params.get("query"))[0];
+        }
         else
-...
+        }
         if(params.containsKey("doctype"))
+        {
         { //check for the doctype
           doctypeArr = (String[])params.get("doctype");
           doctype = null;
+        }
-...
+        {
           doctype="ANY";
+        }
         //create the query and run it
         String xmlquery = DBQuery.createQuery(query, doctype);
         Hashtable doclist = runQuery(xmlquery);
         String qformat = ((String[])params.get("qformat"))[0];
         transformDocument(doclist, qformat, xmlquery, out, response);
         String resultdoc = createResultDocument(doclist, qformat, xmlquery,
                                                 out, response);
         //format and transform the results
         if(qformat.equals("html"))
+        {
           transformResultset(resultdoc, response, out);
+        }
         else if(qformat.equals("xml"))
+        {
           response.setContentType("text/xml");
           out.println(resultdoc);
+        }
         else
+        {
           out.println("invalid qformat: " + qformat);
+        }
         //conn.close();
+      }
       /**
         * Run the query and return a hashtable of results.
         * @param xmlquery the query to run
         */
       private Hashtable runQuery(String xmlquery)
+      {
-...
+        }
+      }
        /**
        * Transorms an xml resultset document to html and sends it to the browser
        * @param resultdoc the string representation of the document that needs
        * to be transformed.
        * @param response the HttpServletResponse object bound to the client.
        * @param out the output stream to the client
        */
       private void transformResultset(String resultdoc,
                                       HttpServletResponse response,
                                       PrintWriter out)
+      {
         Connection conn = null;
         try
+        {
           conn = util.getConnection();
           DBTransform trans = new DBTransform(conn);
           response.setContentType("text/html");
           trans.transformXMLDocument(resultdoc, "-//NCEAS//resultset//EN",
                                      "-//W3C//HTML//EN", out);
+        }
         catch(Exception e)
+        {
           if (conn != null)
+          {
             util.returnConnection(conn);
+          }
+        }
         //conn.close();
+      }
       /**
        * Transforms a hashtable of documents to an xml or html result.
        * @param doclist- the hashtable to transform
-...
        * @param out- the printwriter object used to write to the client
        * @param response- the response stream to write back to the client.
        */
       private void transformDocument(Hashtable doclist, String qformat,
       private String createResultDocument(Hashtable doclist, String qformat,
                                      String xmlquery, PrintWriter out,
                                      HttpServletResponse response)
+      {
-...
           resultset.append("  <document>" + document + "</document>");
+        }
         resultset.append("</resultset>");
         return resultset.toString();
         /*
         if(qformat.equals("xml"))
+        {
           // set content type and other response header fields first
-...
             out.println("Error transforming document:\n" + e.getMessage());
+          }
+        }
         */
+      }
       /**
-...
     /**
      * '$Log$
      * 'Revision 1.71  2000/08/15 20:48:05  berkley
      * 'remove handleQueryAction() in favor of directly calling handleQuery() and handleSQuery() from doGetOrPost()
      * '
      * 'Revision 1.70  2000/08/15 20:02:15  bojilova
      * 'Cleared hardcoded paths for the location of .html files and use
      * 'the new "htmlpath" property from metacat.properties file

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Revision 370

Added by berkley over 23 years ago