Package org.apache.druid.segment.column

Class NullableTypeStrategy<T>

java.lang.Object

org.apache.druid.segment.column.NullableTypeStrategy<T>

All Implemented Interfaces:

it.unimi.dsi.fastutil.Hash.Strategy<T>, Comparator<T>

public final class NullableTypeStrategy<T>
extends Object
implements Comparator<T>, it.unimi.dsi.fastutil.Hash.Strategy<T>

Wrapper of TypeStrategy for nullable types, which stores NullHandling.IS_NULL_BYTE or NullHandling.IS_NOT_NULL_BYTE in the leading byte of any value, as appropriate. If the value is null, only NullHandling.IS_NULL_BYTE will be set, otherwise, the value bytes will be written after the null byte. layout: | null (byte) | value (byte[]) | This is not the most efficient way to track nulls, it is recommended to only use this wrapper if you MUST store null values.

See Also:

TypeStrategy

Constructor Summary

Constructors

Constructor	Description
NullableTypeStrategy(TypeStrategy<T> delegate)

Method Summary

Modifier and Type	Method	Description
int	compare(T o1, T o2)
boolean	equals(T a, T b)
int	estimateSizeBytes(T value)
boolean	groupable()
int	hashCode(T o)
T	read(ByteBuffer buffer)
T	read(ByteBuffer buffer, int offset)
boolean	readRetainsBufferReference()	Whether the read(java.nio.ByteBuffer) methods return an object that may retain a reference to the provided ByteBuffer.
int	write(ByteBuffer buffer, int offset, T value, int maxSizeBytes)
int	write(ByteBuffer buffer, T value, int maxSizeBytes)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

NullableTypeStrategy

public NullableTypeStrategy(TypeStrategy<T> delegate)

Method Detail

estimateSizeBytes

public int estimateSizeBytes(@Nullable
                             T value)

read

@Nullable
public T read(ByteBuffer buffer)

write

@CheckReturnValue
public int write(ByteBuffer buffer,
                 @Nullable
                 T value,
                 int maxSizeBytes)

read

@Nullable
public T read(ByteBuffer buffer,
              int offset)

readRetainsBufferReference

public boolean readRetainsBufferReference()

Whether the read(java.nio.ByteBuffer) methods return an object that may retain a reference to the provided ByteBuffer. If a reference is sometimes retained, this method returns true. It returns false if, and only if, a reference is *never* retained.

write

@CheckReturnValue
public int write(ByteBuffer buffer,
                 int offset,
                 @Nullable
                 T value,
                 int maxSizeBytes)

compare

public int compare(T o1,
                   T o2)

Specified by:

compare in interface Comparator<T>

groupable

public boolean groupable()

hashCode

public int hashCode(@Nullable
                    T o)

Specified by:

hashCode in interface it.unimi.dsi.fastutil.Hash.Strategy<T>

equals

public boolean equals(@Nullable
                      T a,
                      @Nullable
                      T b)

Specified by:

equals in interface it.unimi.dsi.fastutil.Hash.Strategy<T>