Package com.illumon.iris.db.v2.sources

Class NullValueColumnSource<T>

java.lang.Object
com.illumon.iris.db.v2.sources.AbstractColumnSource<T>
com.illumon.iris.db.v2.sources.NullValueColumnSource<T>
All Implemented Interfaces:
ChunkSource<Attributes.Values>, ChunkSource.WithPrev<Attributes.Values>, DefaultChunkSource<Attributes.Values>, DefaultChunkSource.WithPrev<Attributes.Values>, FillContextMaker, GetContextMaker, ColumnSource<T>, ElementSource<T>, Releasable, TupleExporter<T>, TupleSource<T>, ShiftData.ShiftCallback, Serializable
public class NullValueColumnSource<T>
extends AbstractColumnSource<T>
implements ShiftData.ShiftCallback
A column source that returns null for all keys.
See Also:
Serialized Form

  • Method Details

    • getInstance

      public static <T2> NullValueColumnSource<T2> getInstance​(Class<T2> clazz)

    • startTrackingPrevValues

      public void startTrackingPrevValues()
      Description copied from interface: ColumnSource
      ColumnSource implementations that track previous values have the option to not actually start tracking previous values until this method is called. This is an option, not an obligation: some simple ColumnSource implementations (like TSingleValueSource for various T) always track previous values; other implementations (like PrevColumnSource) never do; some (like TArrayColumnSource) only start tracking once this method is called. An immutable column source can not have distinct prev values; therefore it is implemented as a no-op.
      Specified by:
      startTrackingPrevValues in interface ColumnSource<T>

    • get

      public T get​(long index)
      Description copied from interface: ElementSource
      Get the value from the source. This may return boxed values for basic types.
      Specified by:
      get in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the value at the index, potentially null.

    • getBoolean

      public Boolean getBoolean​(long index)
      Description copied from interface: ElementSource
      Get the value at the index as a Boolean.
      Specified by:
      getBoolean in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the boolean at the index, potentially null.

    • getByte

      public byte getByte​(long index)
      Description copied from interface: ElementSource
      Get the value at the index as a byte.
      Specified by:
      getByte in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the boolean at the index, null values are represented by QueryConstants.NULL_BYTE

    • getChar

      public char getChar​(long index)
      Description copied from interface: ElementSource
      Get the value at the index as a char.
      Specified by:
      getChar in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the char at the index, null values are represented by QueryConstants.NULL_CHAR

    • getDouble

      public double getDouble​(long index)
      Description copied from interface: ElementSource
      Get the value at the index as a double.
      Specified by:
      getDouble in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the double at the index, null values are represented by QueryConstants.NULL_DOUBLE

    • getFloat

      public float getFloat​(long index)
      Description copied from interface: ElementSource
      Get the value at the index as a float.
      Specified by:
      getFloat in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the float at the index, null values are represented by QueryConstants.NULL_FLOAT

    • getInt

      public int getInt​(long index)
      Description copied from interface: ElementSource
      Get the value at the index as an int.
      Specified by:
      getInt in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the int at the index, null values are represented by QueryConstants.NULL_INT

    • getLong

      public long getLong​(long index)
      Description copied from interface: ElementSource
      Get the value at the index as a long.
      Specified by:
      getLong in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the long at the index, null values are represented by QueryConstants.NULL_LONG

    • getShort

      public short getShort​(long index)
      Description copied from interface: ElementSource
      Get the value at the index as a short.
      Specified by:
      getShort in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the short at the index, null values are represented by QueryConstants.NULL_SHORT

    • getPrev

      public T getPrev​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index. Previous values are used during an LTM update cycle to process changes in data. During normal operation previous values will be identical to current values.
      Specified by:
      getPrev in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the value from.
      Returns:
      the previous value at the index, or null.

    • getPrevBoolean

      public Boolean getPrevBoolean​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index as a Boolean. See ElementSource.getPrev(long) for more details.
      Specified by:
      getPrevBoolean in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the previous value from.
      Returns:
      the previous boolean at the index, or null.

    • getPrevByte

      public byte getPrevByte​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index as a byte. See ElementSource.getPrev(long) for more details.
      Specified by:
      getPrevByte in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the previous value from.
      Returns:
      the previous boolean at the index, null values are represented by QueryConstants.NULL_BYTE

    • getPrevChar

      public char getPrevChar​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index as a char. See ElementSource.getPrev(long) for more details.
      Specified by:
      getPrevChar in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the previous value from.
      Returns:
      the previous char at the index, null values are represented by QueryConstants.NULL_CHAR

    • getPrevDouble

      public double getPrevDouble​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index as a double. See ElementSource.getPrev(long) for more details.
      Specified by:
      getPrevDouble in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the previous value from.
      Returns:
      the previous double at the index, null values are represented by QueryConstants.NULL_DOUBLE

    • getPrevFloat

      public float getPrevFloat​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index as a float. See ElementSource.getPrev(long) for more details.
      Specified by:
      getPrevFloat in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the previous value from.
      Returns:
      the previous float at the index, null values are represented by QueryConstants.NULL_FLOAT

    • getPrevInt

      public int getPrevInt​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index as an int. See ElementSource.getPrev(long) for more details.
      Specified by:
      getPrevInt in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the previous value from.
      Returns:
      the previous int at the index, null values are represented by QueryConstants.NULL_INT

    • getPrevLong

      public long getPrevLong​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index as a long. See ElementSource.getPrev(long) for more details.
      Specified by:
      getPrevLong in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the previous value from.
      Returns:
      the previous long at the index, null values are represented by QueryConstants.NULL_LONG

    • getPrevShort

      public short getPrevShort​(long index)
      Description copied from interface: ElementSource
      Get the previous value at the index as a short. See ElementSource.getPrev(long) for more details.
      Specified by:
      getPrevShort in interface ElementSource<T>
      Parameters:
      index - the location in index space to get the previous value from.
      Returns:
      the previous short at the index, null values are represented by QueryConstants.NULL_SHORT

    • shift

      public void shift​(long start, long end, long offset)
      Specified by:
      shift in interface ShiftData.ShiftCallback

    • isImmutable

      public boolean isImmutable()
      Description copied from interface: ColumnSource
      Determine if this column source is immutable, meaning that the values at a given index key never change.
      Specified by:
      isImmutable in interface ColumnSource<T>
      Returns:
      true if the values at a given index of the column source never change, false otherwise

    • allowsReinterpret

      public <ALTERNATE_DATA_TYPE> boolean allowsReinterpret​(@NotNull Class<ALTERNATE_DATA_TYPE> alternateDataType)
      Description copied from interface: ColumnSource
      Test if a reinterpret call will succeed.
      Specified by:
      allowsReinterpret in interface ColumnSource<T>
      Overrides:
      allowsReinterpret in class AbstractColumnSource<T>
      Type Parameters:
      ALTERNATE_DATA_TYPE - the dataType to inquire about
      Parameters:
      alternateDataType - The alternative type to consider
      Returns:
      If a reinterpret on this column source with the supplied alternateDataType will succeed.

    • doReinterpret

      protected <ALTERNATE_DATA_TYPE> ColumnSource<ALTERNATE_DATA_TYPE> doReinterpret​(@NotNull Class<ALTERNATE_DATA_TYPE> alternateDataType)
      Description copied from class: AbstractColumnSource
      Supply allowed reinterpret results. The default implementation handles the most common case to avoid code duplication.
      Overrides:
      doReinterpret in class AbstractColumnSource<T>
      Type Parameters:
      ALTERNATE_DATA_TYPE - the dataType to reinterpret to
      Parameters:
      alternateDataType - The alternate data type
      Returns:
      The resulting ColumnSource

    • fillChunk

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

    • fillPrevChunk

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