Examples with RowIterator org.knime.core.data.RowIterator used on opensource projects

Example 26 with RowIterator

use of org.knime.core.data.RowIterator in project knime-core by knime.

the class MDSProjectionManager method preprocFixedDataPoints.

/**
 * Initializes for each of the fixed data points a point in the
 * target space. Which of the columns of the data table containing the
 * fixed points have to be considered (according to the non fixed points)
 * is specified by the given array of indices.
 *
 * @param fixedDataMdsIndices The indices specifying the columns of
 * the data table containing the fixed data points, to consider.
 * @throws CanceledExecutionException If the process is canceled.
 */
protected void preprocFixedDataPoints(final int[] fixedDataMdsIndices) throws CanceledExecutionException {
    m_exec.setMessage("Preprocessing fixed data points");
    // sort indices
    Arrays.sort(fixedDataMdsIndices);
    RowIterator it = m_fixedDataPoints.iterator();
    while (it.hasNext()) {
        m_exec.checkCanceled();
        DataRow row = it.next();
        DataPoint p = new DataPoint(m_dimension);
        for (int i = 0; i < m_dimension; i++) {
            final DataCell cell = row.getCell(fixedDataMdsIndices[i]);
            if (!cell.isMissing()) {
                final Double d = ((DoubleValue) cell).getDoubleValue();
                p.setElementAt(i, d);
            }
        }
        m_fixedPoints.put(row.getKey(), p);
    }
}

Example 27 with RowIterator

use of org.knime.core.data.RowIterator in project knime-core by knime.

the class CAIMDiscretizationNodeModel method createAllIntervalBoundaries2.

/**
 * Sorts the data table in ascending order on the given column, then all
 * distinct values are determined and finally a new table is created that
 * holds the minimum, the maximum value and the midpoints of all adjacent
 * values. These represent all possible boundaries.
 *
 * @param table the table with the data
 * @param columnIndex the column of interest
 * @param exec the execution context to set the progress
 */
private BoundaryScheme createAllIntervalBoundaries2(final BufferedDataTable table, final int columnIndex, final ExecutionContext exec) throws Exception {
    // sort the data accordint to the column index
    List<String> sortColumn = new ArrayList<String>();
    sortColumn.add(table.getDataTableSpec().getColumnSpec(columnIndex).getName());
    boolean[] sortOrder = new boolean[1];
    // in ascending order
    sortOrder[0] = true;
    SortedTable sortedTable = new SortedTable(table, sortColumn, sortOrder, true, exec);
    // the first different value is the minimum value of the sorted list
    RowIterator rowIterator = sortedTable.iterator();
    double lastDifferentValue = ((DoubleValue) rowIterator.next().getCell(columnIndex)).getDoubleValue();
    // create the head of the linked double list
    // marked by NaN
    LinkedDouble head = new LinkedDouble(Double.NEGATIVE_INFINITY);
    // set the last added element
    LinkedDouble lastAdded = head;
    // count the number of boundaries
    int numBoundaries = 0;
    while (rowIterator.hasNext()) {
        DataRow row = rowIterator.next();
        DataCell cell = row.getCell(columnIndex);
        double value = ((DoubleValue) cell).getDoubleValue();
        if (value != lastDifferentValue) {
            // a new boundary is the midpoint
            double newBoundary = (value + lastDifferentValue) / 2.0D;
            lastDifferentValue = value;
            // add the new midpoint boundary to the linked list
            lastAdded.m_next = new LinkedDouble(newBoundary);
            numBoundaries++;
            lastAdded.m_next.m_previous = lastAdded;
            lastAdded = lastAdded.m_next;
        }
    }
    return new BoundaryScheme(head, numBoundaries);
}

Example 28 with RowIterator

use of org.knime.core.data.RowIterator in project knime-core by knime.

the class FileTable method toString.

// addTableSpecStatusOfSettings(SettingsStatus, DataTableSpec)
/**
 * Returns a string summary for this table which is the entire table
 * content. Note, this call might be time consuming since this method
 * iterates over the table to retrieve all data.
 *
 * {@inheritDoc}
 */
@Override
public String toString() {
    // maximum number of chars to print
    final int colLength = 15;
    RowIterator rowIterator = iterator();
    DataRow row;
    StringBuffer result = new StringBuffer();
    // Create a column header
    // Cell (0,0)
    result.append(sprintDataCell(" ", colLength));
    // "<ColName>[Type]"
    for (int i = 0; i < m_tableSpec.getNumColumns(); i++) {
        if (m_tableSpec.getColumnSpec(i).getType().equals(StringCell.TYPE)) {
            result.append(sprintDataCell(m_tableSpec.getColumnSpec(i).getName().toString() + "[Str]", colLength));
        } else if (m_tableSpec.getColumnSpec(i).getType().equals(IntCell.TYPE)) {
            result.append(sprintDataCell(m_tableSpec.getColumnSpec(i).getName().toString() + "[Int]", colLength));
        } else if (m_tableSpec.getColumnSpec(i).getType().equals(DoubleCell.TYPE)) {
            result.append(sprintDataCell(m_tableSpec.getColumnSpec(i).getName().toString() + "[Dbl]", colLength));
        } else {
            result.append(sprintDataCell(m_tableSpec.getColumnSpec(i).getName().toString() + "[UNKNOWN!!]", colLength));
        }
    }
    result.append("\n");
    while (rowIterator.hasNext()) {
        row = rowIterator.next();
        result.append(sprintDataCell(row.getKey().getString(), colLength));
        for (int i = 0; i < row.getNumCells(); i++) {
            result.append(sprintDataCell(row.getCell(i).toString(), colLength));
        }
        result.append("\n");
    }
    return result.toString();
}

Example 29 with RowIterator

use of org.knime.core.data.RowIterator in project knime-core by knime.

the class ConcatenateTableFactory method copyTablesIntoOneTable.

/**
 * Copies all tables, except the last still not-closed table, into an entire new table
 */
private void copyTablesIntoOneTable(final ExecutionContext exec) throws CanceledExecutionException {
    BufferedDataTable[] tables = new BufferedDataTable[m_tables.size() - 1];
    for (int i = 0; i < tables.length; i++) {
        tables[i] = m_tables.get(i).getTable();
    }
    AppendedRowsTable wrapper = new AppendedRowsTable(org.knime.core.data.append.AppendedRowsTable.DuplicatePolicy.Fail, null, tables);
    BufferedDataContainer con = exec.createDataContainer(wrapper.getDataTableSpec());
    RowIterator rowIt = wrapper.iterator();
    exec.setProgress("Too many tables. Copy tables into one table.");
    while (rowIt.hasNext()) {
        exec.checkCanceled();
        con.addRowToTable(rowIt.next());
    }
    con.close();
    BufferedDataContainer last = m_tables.get(m_tables.size() - 1);
    m_tables.clear();
    m_tables.add(con);
    m_tables.add(last);
    exec.setProgress("Tables copied into one.");
}

Example 30 with RowIterator

use of org.knime.core.data.RowIterator in project knime-core by knime.

the class ReplacedColumnsTable method iterator.

/**
 * {@inheritDoc}
 */
public RowIterator iterator() {
    RowIterator origIt = m_table.iterator();
    DataType[] validateTypes = new DataType[m_columns.length];
    for (int column = 0; column < m_columns.length; column++) {
        validateTypes[column] = getDataTableSpec().getColumnSpec(m_columns[column]).getType();
    }
    return new ReplacedColumnsRowIterator(origIt, m_cellFactory, validateTypes, m_columns);
}