org.apache.hive.hcatalog.data

Class JsonSerDe

java.lang.Object

org.apache.hadoop.hive.serde2.AbstractSerDe

org.apache.hive.hcatalog.data.JsonSerDe

All Implemented Interfaces:

org.apache.hadoop.hive.serde2.Deserializer, org.apache.hadoop.hive.serde2.Serializer

public class JsonSerDe
extends org.apache.hadoop.hive.serde2.AbstractSerDe

Field Summary

Fields inherited from class org.apache.hadoop.hive.serde2.AbstractSerDe

configErrors

Constructor Summary

Constructors

Constructor and Description
JsonSerDe()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	deserialize(org.apache.hadoop.io.Writable blob) Takes JSON string in Text form, and has to return an object representation above it that's readable by the corresponding object inspector.
java.lang.String	getHiveInternalColumnName(int fpos)
org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector	getObjectInspector() Returns an object inspector for the specified schema that is capable of reading in the object representation of the JSON string
int	getPositionFromHiveInternalColumnName(java.lang.String internalName)
org.apache.hadoop.hive.serde2.SerDeStats	getSerDeStats()
java.lang.Class<? extends org.apache.hadoop.io.Writable>	getSerializedClass()
void	initialize(org.apache.hadoop.conf.Configuration conf, java.util.Properties tbl)
org.apache.hadoop.io.Writable	serialize(java.lang.Object obj, org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector objInspector) Given an object and object inspector pair, traverse the object and generate a Text representation of the object.

Methods inherited from class org.apache.hadoop.hive.serde2.AbstractSerDe

getConfigurationErrors, initialize, shouldStoreFieldsInMetastore

Methods inherited from class java.lang.Object

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

Constructor Detail

JsonSerDe

public JsonSerDe()

Method Detail

initialize

public void initialize(org.apache.hadoop.conf.Configuration conf,
                       java.util.Properties tbl)
                throws org.apache.hadoop.hive.serde2.SerDeException

Specified by:

initialize in interface org.apache.hadoop.hive.serde2.Deserializer

Specified by:

initialize in interface org.apache.hadoop.hive.serde2.Serializer

Specified by:

initialize in class org.apache.hadoop.hive.serde2.AbstractSerDe

Throws:

org.apache.hadoop.hive.serde2.SerDeException

deserialize

public java.lang.Object deserialize(org.apache.hadoop.io.Writable blob)
                             throws org.apache.hadoop.hive.serde2.SerDeException

Takes JSON string in Text form, and has to return an object representation above it that's readable by the corresponding object inspector. For this implementation, since we're using the jackson parser, we can construct our own object implementation, and we use HCatRecord for it

Specified by:

deserialize in interface org.apache.hadoop.hive.serde2.Deserializer

Specified by:

deserialize in class org.apache.hadoop.hive.serde2.AbstractSerDe

Throws:

org.apache.hadoop.hive.serde2.SerDeException

getHiveInternalColumnName

public java.lang.String getHiveInternalColumnName(int fpos)

getPositionFromHiveInternalColumnName

public int getPositionFromHiveInternalColumnName(java.lang.String internalName)

serialize

public org.apache.hadoop.io.Writable serialize(java.lang.Object obj,
                                               org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector objInspector)
                                        throws org.apache.hadoop.hive.serde2.SerDeException

Given an object and object inspector pair, traverse the object and generate a Text representation of the object.

Specified by:

serialize in interface org.apache.hadoop.hive.serde2.Serializer

Specified by:

serialize in class org.apache.hadoop.hive.serde2.AbstractSerDe

Throws:

org.apache.hadoop.hive.serde2.SerDeException

getObjectInspector

public org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector getObjectInspector()
                                                                                 throws org.apache.hadoop.hive.serde2.SerDeException

Returns an object inspector for the specified schema that is capable of reading in the object representation of the JSON string

Specified by:

getObjectInspector in interface org.apache.hadoop.hive.serde2.Deserializer

Specified by:

getObjectInspector in class org.apache.hadoop.hive.serde2.AbstractSerDe

Throws:

org.apache.hadoop.hive.serde2.SerDeException

getSerializedClass

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

Specified by:

getSerializedClass in interface org.apache.hadoop.hive.serde2.Serializer

Specified by:

getSerializedClass in class org.apache.hadoop.hive.serde2.AbstractSerDe

getSerDeStats

public org.apache.hadoop.hive.serde2.SerDeStats getSerDeStats()

Specified by:

getSerDeStats in interface org.apache.hadoop.hive.serde2.Deserializer

Specified by:

getSerDeStats in interface org.apache.hadoop.hive.serde2.Serializer

Specified by:

getSerDeStats in class org.apache.hadoop.hive.serde2.AbstractSerDe