org.apache.hadoop.hive.serde2

Class AbstractDeserializer

java.lang.Object

org.apache.hadoop.hive.serde2.AbstractDeserializer

All Implemented Interfaces:

Deserializer

Direct Known Subclasses:

ThriftDeserializer

public abstract class AbstractDeserializer
extends java.lang.Object
implements Deserializer

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

Constructor Summary

Constructors

Constructor and Description
AbstractDeserializer()

Method Summary

Modifier and Type	Method and Description
abstract java.lang.Object	deserialize(Writable blob) Deserialize an object out of a Writable blob.
abstract ObjectInspector	getObjectInspector() Get the object inspector that can be used to navigate through the internal structure of the Object returned from deserialize(...).
abstract SerDeStats	getSerDeStats() Returns statistics collected when serializing
abstract void	initialize(Configuration conf, java.util.Properties tbl) Initialize the HiveDeserializer.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDeserializer

public AbstractDeserializer()

Method Detail

initialize

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

Initialize the HiveDeserializer.

Specified by:

initialize in interface Deserializer

Parameters:

conf - System properties

tbl - table properties

Throws:

SerDeException

deserialize

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

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 abstract ObjectInspector getObjectInspector()
                                            throws SerDeException

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

getSerDeStats

public abstract SerDeStats getSerDeStats()

Returns statistics collected when serializing

Specified by:

getSerDeStats in interface Deserializer