Examples of org.apache.metamodel.data.DataSetHeader

org.apache.metamodel.data.DataSetHeader
Represents the header of a {@link DataSet}, which define the columns/SelectItems of it.

            // no need to join, simply return a new view (with null values) on
            // the previous dataset.
            return getSelection(selectItems, ds1);
        }


        final DataSetHeader header = new CachingDataSetHeader(selectItems);


        while (ds1.next()) {


            // Construct a single-row dataset for making a carthesian product
            // against ds2

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    @Override
    protected DataSet materializeMainSchemaTable(Table table, Column[] columns, int maxRows) {
        if (_tableName.equals(table.getName())) {
            final SelectItem[] allSelectItems = MetaModelHelper.createSelectItems(table.getColumns());
            final DataSetHeader header = new CachingDataSetHeader(allSelectItems);
            final List<Row> data = new ArrayList<Row>();
            data.add(new DefaultRow(header, new Object[] { "1", "hello", "world" }, null));
            data.add(new DefaultRow(header, new Object[] { "2", _value, "world" }, null));
            data.add(new DefaultRow(header, new Object[] { "3", "hi", _value }, null));
            data.add(new DefaultRow(header, new Object[] { "4", "yo", "world" }, null));

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                        final Number count = executeCountQuery(table, whereItems, functionApproximationAllowed);
                        if (count == null) {
                            logger.debug("DataContext did not return any count query results. Proceeding with manual counting.");
                        } else {
                            List<Row> data = new ArrayList<Row>(1);
                            final DataSetHeader header = new SimpleDataSetHeader(new SelectItem[] { selectItem });
                            data.add(new DefaultRow(header, new Object[] { count }));
                            return new InMemoryDataSet(header, data);
                        }
                    }
                }

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