Package org.apache.druid.segment

Interface CloseableShapeshifter

All Superinterfaces:
AutoCloseable, Closeable
All Known Implementing Classes:
AbstractFrameRowsAndColumns, ColumnBasedFrameRowsAndColumns, CursorFactoryRowsAndColumns, QueryableIndexRowsAndColumns, RowBasedFrameRowsAndColumns
public interface CloseableShapeshifter extends Closeable
A CloseableShapeshifter is an interface created to allow Segments to be used from as(Class), but also to be able to ensure that any resource used by the object returned from the as(Class) method have proper management of their lifecycle. This was initially introduced in order to make it possible for Segment to become a RowsAndColumns without needing to add extra close() methods to RowsAndColumns.

  • Method Summary

    Modifier and Type
    Method
    Description
    <T> T
    as(Class<T> clazz)
    Asks the Object to return itself as a concrete implementation of a specific interface.

    Methods inherited from interface java.io.Closeable

    close

  • Method Details

    • as

      @Nullable <T> T as(@Nonnull Class<T> clazz)
      Asks the Object to return itself as a concrete implementation of a specific interface. The interface asked for will tend to be a semantically-meaningful interface.
      Type Parameters:
      T - The interface that the calling code wants a concrete implementation of
      Parameters:
      clazz - A class object representing the interface that the calling code wants a concrete implementation of
      Returns:
      A concrete implementation of the interface, or null if there is no meaningful optimization to be had through a local implementation of the interface.