Examples of org.apache.metamodel.data.EmptyDataSet

org.apache.metamodel.data.EmptyDataSet
An empty data set. @author Kasper Sørensen

    public DataSet executeQuery(InputStream inputStream, Table table, Column[] columns, int maxRows) {
        final Workbook wb = ExcelUtils.readWorkbook(inputStream);
        final Sheet sheet = wb.getSheet(table.getName());


        if (sheet == null || sheet.getPhysicalNumberOfRows() == 0) {
            return new EmptyDataSet(columns);
        }


        DataSet dataSet = ExcelUtils.getDataSet(wb, sheet, table, _configuration);


        if (maxRows > 0) {

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                selectItems.add(new SelectItem(columns[0]));
            }
        }


        if (maxRows == 0) {
            return new EmptyDataSet(selectItems);
        }


        final Schema schema = table.getSchema();
        final String schemaName;
        if (schema == null) {

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            throw new IllegalArgumentException("Cannot materialize non information_schema table: " + table);
        }


        DataSet dataSet;
        if (data.isEmpty()) {
            dataSet = new EmptyDataSet(selectItems);
        } else {
            dataSet = new InMemoryDataSet(header, data);
        }


        // Handle column subset

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    public static DataSet getDataSet(Workbook workbook, Sheet sheet, Table table, ExcelConfiguration configuration) {
        final SelectItem[] selectItems = MetaModelHelper.createSelectItems(table.getColumns());
        final Iterator<Row> rowIterator = getRowIterator(sheet, configuration, true);
        if (!rowIterator.hasNext()) {
            // no more rows!
            return new EmptyDataSet(selectItems);
        }


        final DataSet dataSet = new XlsDataSet(selectItems, workbook, rowIterator);
        return dataSet;
    }

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                    if (!resultSet.next()) {
                        // the result set was not as long as the first row
                        if (resultSet != null) {
                            resultSet.close();
                        }
                        return new EmptyDataSet(query.getSelectClause().getItems());
                    }
                }
            }


            if (lease == null) {

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            }
            selectItemOffset += fromSelectItems.length;
        }


        if (data.isEmpty()) {
            return new EmptyDataSet(selectItems);
        }


        final DataSetHeader header = new CachingDataSetHeader(selectItems);
        final List<Row> rows = new ArrayList<Row>(data.size());
        for (Object[] objects : data) {

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                }
                resultData.add(new DefaultRow(resultHeader, resultRow, null));
            }


            if (resultData.isEmpty()) {
                result = new EmptyDataSet(selectItems);
            } else {
                result = new InMemoryDataSet(resultHeader, resultData);
            }
        }
        result = getSelection(selectItems, result);

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                sortIndexes[i] = indexOf;
            }


            final List<Row> data = readDataSetFull(dataSet);
            if (data.isEmpty()) {
                return new EmptyDataSet(dataSet.getSelectItems());
            }


            final Comparator<Object> valueComparator = ObjectComparator.getComparator();


            // create a comparator for doing the actual sorting/ordering

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            }
        }
        ds1.close();


        if (resultRows.isEmpty()) {
            return new EmptyDataSet(selectItems);
        }


        return new InMemoryDataSet(header, resultRows);
    }

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        try {
            // skip column header lines
            for (int i = 0; i < lineNumber; i++) {
                String line = reader.readLine();
                if (line == null) {
                    return new EmptyDataSet(columns);
                }
            }
        } catch (IOException e) {
            throw new MetaModelException("IOException occurred while reading from CSV resource: " + _resource, e);
        }

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