org.apache.hadoop.hive.serde2

Class TypedSerDe

java.lang.Object

org.apache.hadoop.hive.serde2.AbstractSerDe

org.apache.hadoop.hive.serde2.TypedSerDe

All Implemented Interfaces:

Deserializer, SerDe, Serializer

Direct Known Subclasses:

ByteStreamTypedSerDe

public abstract class TypedSerDe
extends AbstractSerDe

TypedSerDe.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.Object	deserializeCache
protected java.lang.Class<?>	objectClass
protected java.lang.reflect.Type	objectType

Constructor Summary

Constructors

Constructor and Description
TypedSerDe(java.lang.reflect.Type objectType)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	deserialize(Writable blob) Deserialize an object out of a Writable blob.
ObjectInspector	getObjectInspector() Get the object inspector that can be used to navigate through the internal structure of the Object returned from deserialize(...).
protected ObjectInspectorFactory.ObjectInspectorOptions	getObjectInspectorOptions()
SerDeStats	getSerDeStats() Returns statistics collected when serializing
java.lang.Class<? extends Writable>	getSerializedClass() Returns the Writable class that would be returned by the serialize method.
void	initialize(Configuration job, java.util.Properties tbl) Initialize the HiveSerializer.
Writable	serialize(java.lang.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

Field Detail

objectType

protected java.lang.reflect.Type objectType

objectClass

protected java.lang.Class<?> objectClass

deserializeCache

protected java.lang.Object deserializeCache

Constructor Detail

TypedSerDe

public TypedSerDe(java.lang.reflect.Type objectType)
           throws SerDeException

Throws:

SerDeException

Method Detail

deserialize

public java.lang.Object deserialize(Writable blob)
                             throws SerDeException

Description copied from class: AbstractSerDe

Deserialize an object out of a Writable blob. In most cases, the return value of this function will be constant since the function will reuse the returned object. If the client wants to keep a copy of the object, the client needs to clone the returned value by calling ObjectInspectorUtils.getStandardObject().

Specified by:

deserialize in interface Deserializer

Specified by:

deserialize in class AbstractSerDe

Parameters:

blob - The Writable object containing a serialized object

Returns:

A Java object representing the contents in the blob.

Throws:

SerDeException

getObjectInspector

public ObjectInspector getObjectInspector()
                                   throws SerDeException

Description copied from class: AbstractSerDe

Get the object inspector that can be used to navigate through the internal structure of the Object returned from deserialize(...).

Specified by:

getObjectInspector in interface Deserializer

Specified by:

getObjectInspector in class AbstractSerDe

Throws:

SerDeException

getObjectInspectorOptions

protected ObjectInspectorFactory.ObjectInspectorOptions getObjectInspectorOptions()

initialize

public void initialize(Configuration job,
                       java.util.Properties tbl)
                throws SerDeException

Description copied from class: AbstractSerDe

Initialize the HiveSerializer.

Specified by:

initialize in interface Deserializer

Specified by:

initialize in interface Serializer

Specified by:

initialize in class AbstractSerDe

Parameters:

job - System properties

tbl - table properties

Throws:

SerDeException

getSerializedClass

public java.lang.Class<? extends Writable> getSerializedClass()

Description copied from class: AbstractSerDe

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

Specified by:

getSerializedClass in class AbstractSerDe

serialize

public Writable serialize(java.lang.Object obj,
                          ObjectInspector objInspector)
                   throws SerDeException

Description copied from class: AbstractSerDe

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

Specified by:

serialize in class AbstractSerDe

Throws:

SerDeException

getSerDeStats

public SerDeStats getSerDeStats()

Description copied from class: AbstractSerDe

Returns statistics collected when serializing

Specified by:

getSerDeStats in interface Deserializer

Specified by:

getSerDeStats in interface Serializer

Specified by:

getSerDeStats in class AbstractSerDe