org.apache.hadoop.hive.serde2.columnar
Class ColumnarSerDeBase

java.lang.Object
  org.apache.hadoop.hive.serde2.columnar.ColumnarSerDeBase

All Implemented Interfaces:

Deserializer, SerDe, Serializer

Direct Known Subclasses:

ColumnarSerDe, LazyBinaryColumnarSerDe

public abstract class ColumnarSerDeBase
extends Object
implements SerDe

Field Summary

protected ObjectInspector	cachedObjectInspector
protected boolean	lastOperationDeserialize
protected boolean	lastOperationSerialize
protected long	serializedSize
protected SerDeStats	stats

Constructor Summary

ColumnarSerDeBase()

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(...).
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.
protected void	initialize(int 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.hadoop.hive.serde2.Deserializer

initialize

Methods inherited from interface org.apache.hadoop.hive.serde2.Serializer

initialize, serialize

Field Detail

cachedObjectInspector

protected ObjectInspector cachedObjectInspector

serializedSize

protected long serializedSize

stats

protected SerDeStats stats

lastOperationSerialize

protected boolean lastOperationSerialize

lastOperationDeserialize

protected boolean lastOperationDeserialize

Constructor Detail

ColumnarSerDeBase

public ColumnarSerDeBase()

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

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

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

initialize

protected void initialize(int size)
                   throws SerDeException

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