Package org.apache.druid.query.aggregation

Class SerializablePairLongStringSimpleStagedSerde

java.lang.Object

org.apache.druid.query.aggregation.AbstractSerializablePairLongObjectSimpleStagedSerde<SerializablePairLongString>

org.apache.druid.query.aggregation.SerializablePairLongStringSimpleStagedSerde

All Implemented Interfaces:

StagedSerde<SerializablePairLongString>

public class SerializablePairLongStringSimpleStagedSerde
extends AbstractSerializablePairLongObjectSimpleStagedSerde<SerializablePairLongString>

serializes a Long/String pair as Long:Integer:bytes

or Long:StringSize:StringData The StringSize can be following: -1 : Denotes an empty string 0 : Denotes a null string >0 : Denotes a non-empty string Mapping of null and empty string is done weirdly to preserve backward compatibility when nulls were returned all the time, and there was no distinction between empty and null string

Constructor Summary

Constructors

Constructor	Description
SerializablePairLongStringSimpleStagedSerde()

Method Summary

Modifier and Type	Method	Description
SerializablePairLongString	deserialize(ByteBuffer byteBuffer)
StorableBuffer	serializeDelayed(SerializablePairLongString value)	Useful method when some computation is necessary to prepare for serialization without actually writing out all the bytes in order to determine the serialized size.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.segment.serde.cell.StagedSerde

deserialize, serialize

Constructor Detail

SerializablePairLongStringSimpleStagedSerde

public SerializablePairLongStringSimpleStagedSerde()

Method Detail

serializeDelayed

public StorableBuffer serializeDelayed(@Nullable
                                       SerializablePairLongString value)

Description copied from interface: StagedSerde

Useful method when some computation is necessary to prepare for serialization without actually writing out all the bytes in order to determine the serialized size. It allows encapsulation of the size computation and the final logical to actually store into a ByteBuffer. It also allows for callers to pack multiple serialized objects into a single ByteBuffer without extra copies of a byte[]/ByteBuffer by using the StorableBuffer instance returned

Specified by:

serializeDelayed in interface StagedSerde<SerializablePairLongString>

Overrides:

serializeDelayed in class AbstractSerializablePairLongObjectSimpleStagedSerde<SerializablePairLongString>

Parameters:

value - - object to serialize

Returns:

an object that reports its serialized size and how to serialize the object to a ByteBuffer

deserialize

@Nullable
public SerializablePairLongString deserialize(ByteBuffer byteBuffer)