org.apache.hadoop.hive.serde2.json

Class HiveJsonWriter

java.lang.Object

org.apache.hadoop.hive.serde2.json.HiveJsonWriter

public class HiveJsonWriter
extends Object

A class which takes Java Objects and a ObjectInspector to produce a JSON string representation of the structure. The Java Object can be a Collection containing other Collections and therefore can be thought of as a tree or as a directed acyclic graph that must be walked and each node recorded as JSON.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HiveJsonWriter.Feature Enumeration that defines all on/off features for this writer.

Constructor Summary

Constructors

Constructor and Description
HiveJsonWriter() Default constructor.
HiveJsonWriter(BinaryEncoding encoding, List<String> rootStructFieldNames) Constructs a JSON writer.

Method Summary

Modifier and Type	Method and Description
void	disable(HiveJsonWriter.Feature feature)
void	enable(HiveJsonWriter.Feature feature)
BinaryEncoding	getBinaryEncodingType()
Set<HiveJsonWriter.Feature>	getFeatures()
boolean	isEnabled(HiveJsonWriter.Feature feature)
void	setBinaryEncoding(BinaryEncoding encoding)
String	toString()
String	write(Object o, ObjectInspector objInspector) Given an Object and an ObjectInspector, convert the structure into a JSON text string.

Methods inherited from class java.lang.Object

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

Constructor Detail

HiveJsonWriter

public HiveJsonWriter()

Default constructor. Uses base-64 mime encoding for any binary data.

HiveJsonWriter

public HiveJsonWriter(BinaryEncoding encoding,
                      List<String> rootStructFieldNames)

Constructs a JSON writer.

Parameters:

encoding - The encoding to use for binary data

rootStructFieldNames - The names of the fields at the root level

Method Detail

write

public String write(Object o,
                    ObjectInspector objInspector)
             throws SerDeException

Given an Object and an ObjectInspector, convert the structure into a JSON text string.

Parameters:

o - The object to convert

objInspector - The ObjectInspector describing the object

Returns:

A String containing the JSON text

Throws:

SerDeException - The object cannot be transformed

enable

public void enable(HiveJsonWriter.Feature feature)

disable

public void disable(HiveJsonWriter.Feature feature)

getFeatures

public Set<HiveJsonWriter.Feature> getFeatures()

isEnabled

public boolean isEnabled(HiveJsonWriter.Feature feature)

getBinaryEncodingType

public BinaryEncoding getBinaryEncodingType()

setBinaryEncoding

public void setBinaryEncoding(BinaryEncoding encoding)

toString

public String toString()

Overrides:

toString in class Object