Beispiel #1
0
 private void addListElement(Object listValue, HTable headers, Table dataTable)
     throws JSONException {
   if (listValue instanceof JSONObject) {
     Row row = dataTable.addRow(getFactory());
     JSONObject o = (JSONObject) listValue;
     @SuppressWarnings("unchecked")
     Iterator<String> it = o.sortedKeys();
     while (it.hasNext()) {
       String key = it.next();
       addObjectElement(key, o.get(key), headers, row);
     }
   } else if (isPrimitiveValue(listValue)) {
     HNode hNode = addHNode(headers, "values");
     String hNodeId = hNode.getId();
     Row row = dataTable.addRow(getFactory());
     // TODO, conserve the types of the primitive types.
     String value = "";
     if (listValue instanceof String || listValue instanceof Boolean) {
       value = (String) listValue;
     } else if (listValue instanceof Double) {
       value = Double.toString((Double) listValue);
     } else if (listValue instanceof Integer) {
       value = Integer.toString((Integer) listValue);
     } else if (listValue instanceof Long) {
       value = Long.toString((Long) listValue);
     } else {
       // Pedro 2012/09/14
       logger.error("Unexpected value in JSON array:" + listValue.toString());
     }
     row.setValue(hNodeId, value, getFactory());
   } else if (listValue instanceof JSONArray) {
     HNode hNode = addHNode(headers, "nested array");
     String hNodeId = hNode.getId();
     Row row = dataTable.addRow(getFactory());
     HTable nestedHTable = addNestedHTable(hNode, "nested array values", row);
     Table nestedTable = row.getNode(hNodeId).getNestedTable();
     JSONArray a = (JSONArray) listValue;
     for (int i = 0; i < a.length(); i++) {
       addListElement(a.get(i), nestedHTable, nestedTable);
     }
   } else {
     logger.error("Cannot handle whatever case is not covered by the if statements. Sorry.");
   }
 }
Beispiel #2
0
 private void addKeysAndValues(JSONObject object, HTable nestedHTable, Table nestedTable)
     throws JSONException {
   Row nestedRow = nestedTable.addRow(getFactory());
   @SuppressWarnings("unchecked")
   Iterator<String> it = object.sortedKeys();
   while (it.hasNext()) {
     String nestedKey = it.next();
     addObjectElement(nestedKey, object.get(nestedKey), nestedHTable, nestedRow);
   }
 }
Beispiel #3
0
 private void addEmptyRow(Table nestedTable, HNode hNode) {
   HTable headersNestedTable = hNode.getNestedTable();
   Row emptyRow = nestedTable.addRow(getFactory());
   for (HNode nestedHNode : headersNestedTable.getHNodes()) {
     if (nestedHNode.hasNestedTable()) {
       addEmptyRow(emptyRow.getNode(nestedHNode.getId()).getNestedTable(), nestedHNode);
     } else {
       emptyRow.setValue(nestedHNode.getId(), "", getFactory());
     }
   }
 }
  private void generateRDF(
      String wkname,
      String query,
      List<KR2RMLRDFWriter> writers,
      R2RMLMappingIdentifier id,
      String baseURI)
      throws IOException, JSONException, KarmaException, SQLException, ClassNotFoundException {
    logger.debug("Generating RDF...");

    WorksheetR2RMLJenaModelParser parserTest = new WorksheetR2RMLJenaModelParser(id);
    KR2RMLMapping mapping = parserTest.parse();

    AbstractJDBCUtil dbUtil = JDBCUtilFactory.getInstance(dbType);
    Connection conn = dbUtil.getConnection(hostname, portnumber, username, password, dBorSIDName);
    conn.setAutoCommit(false);

    java.sql.Statement stmt =
        conn.createStatement(
            java.sql.ResultSet.TYPE_FORWARD_ONLY, java.sql.ResultSet.CONCUR_READ_ONLY);
    stmt.setFetchSize(DATABASE_TABLE_FETCH_SIZE);

    ResultSet r = stmt.executeQuery(query);
    ResultSetMetaData meta = r.getMetaData();
    ;

    // Get the column names
    List<String> columnNames = new ArrayList<>();
    for (int i = 1; i <= meta.getColumnCount(); i++) {
      columnNames.add(meta.getColumnName(i));
    }

    // Prepare required Karma objects
    Workspace workspace = initializeWorkspace();

    RepFactory factory = workspace.getFactory();
    Worksheet wk = factory.createWorksheet(wkname, workspace, encoding);
    List<String> headersList = addHeaders(wk, columnNames, factory);

    int counter = 0;

    ArrayList<String> rowValues = null;
    while ((rowValues = dbUtil.parseResultSetRow(r)) != null) {
      // Generate RDF and create a new worksheet for every DATABASE_TABLE_FETCH_SIZE rows
      if (counter % DATABASE_TABLE_FETCH_SIZE == 0 && counter != 0) {
        generateRDFFromWorksheet(wk, workspace, mapping, writers, baseURI);
        logger.debug("Done for " + counter + " rows ...");
        removeWorkspace(workspace);

        parserTest = new WorksheetR2RMLJenaModelParser(id);
        mapping = parserTest.parse();
        workspace = initializeWorkspace();
        factory = workspace.getFactory();
        wk = factory.createWorksheet(wkname, workspace, encoding);
        headersList = addHeaders(wk, columnNames, factory);
      }

      /** Add the data * */
      Table dataTable = wk.getDataTable();
      Row row = dataTable.addRow(factory);
      for (int i = 0; i < rowValues.size(); i++) {
        row.setValue(headersList.get(i), rowValues.get(i), factory);
      }

      counter++;
    }

    generateRDFFromWorksheet(wk, workspace, mapping, writers, baseURI);

    // Releasing all the resources
    r.close();
    conn.close();
    stmt.close();
    logger.debug("done");
  }