Package io.deephaven.engine.table.impl.sources

Class RowKeyColumnSource

java.lang.Object
io.deephaven.engine.table.impl.AbstractColumnSource<Long>
io.deephaven.engine.table.impl.sources.RowKeyColumnSource
All Implemented Interfaces:
ChunkSource<Values>, ChunkSource.WithPrev<Values>, ColumnSource<Long>, ElementSource<Long>, FillContextMaker, GetContextMaker, ColumnSourceGetDefaults.ForLong, ColumnSourceGetDefaults.LongBacked<Long>, DefaultChunkSource<Values>, DefaultChunkSource.WithPrev<Values>, ImmutableColumnSource<Long>, ImmutableColumnSourceGetDefaults.ForLong, FillUnordered<Values>, Releasable, TupleExporter<Long>, TupleSource<Long>
public class RowKeyColumnSource extends AbstractColumnSource<Long> implements ImmutableColumnSourceGetDefaults.ForLong, FillUnordered<Values>
This is a column source that uses no additional memory and is an identity mapping from row key to row key.

  • Field Details

  • Constructor Details

    • RowKeyColumnSource

      public RowKeyColumnSource()

  • Method Details

    • getLong

      public long getLong(long rowKey)
      Description copied from interface: ElementSource
      Get the value at the rowKey as a long. RowKeys that are not present are undefined.
      Specified by:
      getLong in interface ElementSource<Long>
      Parameters:
      rowKey - the location in key space to get the value from.
      Returns:
      the long at the rowKey, null values are represented by QueryConstants.NULL_LONG

    • fillChunk

      public void fillChunk(@NotNull @NotNull ChunkSource.FillContext context, @NotNull @NotNull WritableChunk<? super Values> destination, @NotNull @NotNull RowSequence rowSequence)
      Description copied from interface: ChunkSource
      Populates the given destination chunk with data corresponding to the keys from the given RowSequence.
      Specified by:
      fillChunk in interface ChunkSource<Values>
      Overrides:
      fillChunk in class AbstractColumnSource<Long>
      Parameters:
      context - A context containing all mutable/state related data used in retrieving the Chunk.
      destination - The chunk to be populated according to rowSequence. No assumptions shall be made about the size of the chunk shall be made. The chunk will be populated from position [0,rowSequence.size()).
      rowSequence - An RowSequence representing the keys to be fetched

    • fillPrevChunk

      public void fillPrevChunk(@NotNull @NotNull ChunkSource.FillContext context, @NotNull @NotNull WritableChunk<? super Values> destination, @NotNull @NotNull RowSequence rowSequence)
      Description copied from interface: ChunkSource.WithPrev
      Populates the given destination chunk with data corresponding to the keys from the given RowSequence.
      Specified by:
      fillPrevChunk in interface ChunkSource.WithPrev<Values>
      Overrides:
      fillPrevChunk in class AbstractColumnSource<Long>
      Parameters:
      context - A context containing all mutable/state related data used in retrieving the Chunk.
      destination - The chunk to be populated according to rowSequence. No assumptions shall be made about the size of the chunk shall be made. The chunk will be populated from position [0,rowSequence.size()).
      rowSequence - An RowSequence representing the keys to be fetched

    • providesFillUnordered

      public boolean providesFillUnordered()
      Description copied from interface: FillUnordered
      Returns true if this column source can efficiently provide an unordered fill. If this method returns false, then fillChunkUnordered and fillPrevChunkUnordered may throw an UnsupportedOperationException.
      Specified by:
      providesFillUnordered in interface FillUnordered<Values>
      Returns:
      if this column source can provide an unordered fill

    • fillChunkUnordered

      public void fillChunkUnordered(@NotNull @NotNull ChunkSource.FillContext context, @NotNull @NotNull WritableChunk<? super Values> dest, @NotNull @NotNull LongChunk<? extends RowKeys> keys)
      Description copied from interface: FillUnordered
      Populates a contiguous portion of the given destination chunk with data corresponding to the keys from the given LongChunk.

      It behaves as if the following code were executed: 

       destination.setSize(keys.size());
 for (int ii = 0; ii < keys.size(); ++ii) {
     destination.set(ii, get(keys.get(ii)));
 }
      Specified by:
      fillChunkUnordered in interface FillUnordered<Values>
      Parameters:
      context - A context containing all mutable/state related data used in retrieving the Chunk.
      dest - The chunk to be populated according to keys
      keys - A chunk of individual, not assumed to be ordered keys to be fetched

    • fillPrevChunkUnordered

      public void fillPrevChunkUnordered(@NotNull @NotNull ChunkSource.FillContext context, @NotNull @NotNull WritableChunk<? super Values> dest, @NotNull @NotNull LongChunk<? extends RowKeys> keys)
      Description copied from interface: FillUnordered
      Populates a contiguous portion of the given destination chunk with prev data corresponding to the keys from the given LongChunk.

      It behaves as if the following code were executed: 

       destination.setSize(keys.size());
 for (int ii = 0; ii < keys.size(); ++ii) {
     destination.set(ii, getPrev(keys.get(ii)));
 }
      Specified by:
      fillPrevChunkUnordered in interface FillUnordered<Values>
      Parameters:
      context - A context containing all mutable/state related data used in retrieving the Chunk.
      dest - The chunk to be populated according to keys
      keys - A chunk of individual, not assumed to be ordered keys to be fetched