org.apache.hadoop.hive.serde2
Class TypedSerDe

java.lang.Object
  org.apache.hadoop.hive.serde2.TypedSerDe

All Implemented Interfaces:

Deserializer, SerDe, Serializer

Direct Known Subclasses:

ByteStreamTypedSerDe

public abstract class TypedSerDe
extends Object
implements SerDe

TypedSerDe.

Field Summary

protected Object	deserializeCache
protected Class<?>	objectClass
protected Type	objectType

Constructor Summary

TypedSerDe(Type objectType)

Method Summary

Object	deserialize(org.apache.hadoop.io.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
Class<? extends org.apache.hadoop.io.Writable>	getSerializedClass() Returns the Writable class that would be returned by the serialize method.
void	initialize(org.apache.hadoop.conf.Configuration job, Properties tbl) Initialize the HiveDeserializer.
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

Field Detail

objectType

protected Type objectType

objectClass

protected Class<?> objectClass

deserializeCache

protected Object deserializeCache

Constructor Detail

TypedSerDe

public TypedSerDe(Type objectType)
           throws SerDeException

Throws:

SerDeException

Method Detail

deserialize

public Object deserialize(org.apache.hadoop.io.Writable blob)
                   throws SerDeException

Description copied from interface: Deserializer

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

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 interface: Deserializer

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

Throws:

SerDeException

getObjectInspectorOptions

protected ObjectInspectorFactory.ObjectInspectorOptions getObjectInspectorOptions()

initialize

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

Description copied from interface: Deserializer

Initialize the HiveDeserializer.

Specified by:

initialize in interface Deserializer

Specified by:

initialize in interface Serializer

Parameters:

job - System properties

tbl - table properties

Throws:

SerDeException

getSerializedClass

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

Description copied from interface: Serializer

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

Description copied from interface: Serializer

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 SerDeStats getSerDeStats()

Description copied from interface: Deserializer

Returns statistics collected when serializing

Specified by:

getSerDeStats in interface Deserializer

Specified by:

getSerDeStats in interface Serializer