org.apache.hadoop.hive.serde2

Class AbstractSerializer

java.lang.Object

org.apache.hadoop.hive.serde2.AbstractSerializer

All Implemented Interfaces:

Serializer

public abstract class AbstractSerializer
extends Object
implements Serializer

Abstract class for implementing Serializer. The abstract class has been created, so that new methods can be added in the underlying interface, Serializer, and only implementations that need those methods overwrite it.

Constructor Summary

Constructors

Constructor and Description
AbstractSerializer()

Method Summary

Modifier and Type	Method and Description
abstract SerDeStats	getSerDeStats() Returns statistics collected when serializing
abstract Class<? extends org.apache.hadoop.io.Writable>	getSerializedClass() Returns the Writable class that would be returned by the serialize method.
abstract void	initialize(org.apache.hadoop.conf.Configuration conf, Properties tbl) Initialize the HiveSerializer.
abstract org.apache.hadoop.io.Writable	serialize(Object obj, ObjectInspector objInspector) Serialize an object by navigating inside the Object with the ObjectInspector.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractSerializer

public AbstractSerializer()

Method Detail

initialize

public abstract void initialize(org.apache.hadoop.conf.Configuration conf,
                                Properties tbl)
                         throws SerDeException

Initialize the HiveSerializer.

Specified by:

initialize in interface Serializer

Parameters:

conf - System properties

tbl - table properties

Throws:

SerDeException

getSerializedClass

public abstract Class<? extends org.apache.hadoop.io.Writable> getSerializedClass()

Returns the Writable class that would be returned by the serialize method. This is used to initialize SequenceFile header.

Specified by:

getSerializedClass in interface Serializer

serialize

public abstract org.apache.hadoop.io.Writable serialize(Object obj,
                                                        ObjectInspector objInspector)
                                                 throws SerDeException

Serialize an object by navigating inside the Object with the ObjectInspector. In most cases, the return value of this function will be constant since the function will reuse the Writable object. If the client wants to keep a copy of the Writable, the client needs to clone the returned value.

Specified by:

serialize in interface Serializer

Throws:

SerDeException

getSerDeStats

public abstract SerDeStats getSerDeStats()

Returns statistics collected when serializing

Specified by:

getSerDeStats in interface Serializer