Package app.babylon.table.io

Interface HeaderStrategy

All Known Implementing Classes:
HeaderStrategyAuto, HeaderStrategyExpectedHeaders, HeaderStrategyExplicitRow, HeaderStrategyNoHeaders, HeaderStrategyWidestNonEmptyRow
public interface HeaderStrategy
Detects header rows and selected columns for an input stream according to a specific header interpretation strategy.

  • Field Details

    • DEFAULT_SCAN_LIMIT

      static final int DEFAULT_SCAN_LIMIT
      Default number of rows to scan when inferring headers.
      See Also:

  • Method Details

    • getScanLimit

      default int getScanLimit()
      Returns the maximum number of rows to scan during header detection.
      Returns:
      scan limit

    • detect

      default HeaderDetection detect(RowStreamMarkable rowStream, Set<ColumnName> selectedColumns) throws IOException
      Detects headers and optional selected columns from a markable row stream.
      Parameters:
      rowStream - row stream to inspect
      selectedColumns - requested selected columns
      Returns:
      detected header information
      Throws:
      IOException - if stream inspection fails

    • detectFoundHeaders

      HeaderDetection detectFoundHeaders(RowStreamMarkable rowStream, Set<ColumnName> selectedColumns) throws IOException
      Detects the raw headers present in the source.
      Parameters:
      rowStream - row stream to inspect
      selectedColumns - requested selected columns
      Returns:
      detected raw header information
      Throws:
      IOException - if stream inspection fails

    • toColumnNames

      static ColumnName[] toColumnNames(ByteStringSlices row)