Package org.apache.avro.generic

Class DeterministicMapOrderGenericDatumWriter<T>

java.lang.Object

org.apache.avro.generic.GenericDatumWriter<T>

org.apache.avro.generic.DeterministicMapOrderGenericDatumWriter<T>

All Implemented Interfaces:

DeterministicMapOrderDatumWriter, org.apache.avro.io.DatumWriter<T>

public class DeterministicMapOrderGenericDatumWriter<T>
extends org.apache.avro.generic.GenericDatumWriter<T>
implements DeterministicMapOrderDatumWriter

An Avro generic datum writer that sorts the map entries by keys before serializing the map. In original Avro implementation GenericDatumWriter Avro gets all entries from the Map and serializes the entries right away. This may generate inconsistent results if 2 maps have the same entry set but are constructed in the different orders. A specific datum writer is also provided. See DeterministicMapOrderSpecificDatumWriter for more details. TODO: consider putting the class to Fast Avro library

Field Summary

Fields inherited from interface org.apache.avro.generic.DeterministicMapOrderDatumWriter

COMPARATOR

Constructor Summary

Constructors

Constructor	Description
DeterministicMapOrderGenericDatumWriter(org.apache.avro.generic.GenericData data)
DeterministicMapOrderGenericDatumWriter(org.apache.avro.Schema root)
DeterministicMapOrderGenericDatumWriter(org.apache.avro.Schema root, org.apache.avro.generic.GenericData data)

Method Summary

Modifier and Type	Method	Description
void	internalWrite(org.apache.avro.Schema schema, java.lang.Object datum, org.apache.avro.io.Encoder out)
protected void	writeMap(org.apache.avro.Schema schema, java.lang.Object datum, org.apache.avro.io.Encoder out)

Methods inherited from class org.apache.avro.generic.GenericDatumWriter

addAvroTypeMsg, addClassCastMsg, convert, getArrayElements, getArraySize, getData, getMapEntries, getMapSize, npe, resolveUnion, setSchema, write, write, writeArray, writeBytes, writeEnum, writeField, writeFixed, writeRecord, writeString, writeString, writeWithoutConversion

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.avro.generic.DeterministicMapOrderDatumWriter

writeMapWithDeterministicOrder

Constructor Detail

DeterministicMapOrderGenericDatumWriter

public DeterministicMapOrderGenericDatumWriter(org.apache.avro.Schema root)

DeterministicMapOrderGenericDatumWriter

public DeterministicMapOrderGenericDatumWriter(org.apache.avro.generic.GenericData data)

DeterministicMapOrderGenericDatumWriter

public DeterministicMapOrderGenericDatumWriter(org.apache.avro.Schema root,
                                               org.apache.avro.generic.GenericData data)

Method Detail

internalWrite

public void internalWrite(org.apache.avro.Schema schema,
                          java.lang.Object datum,
                          org.apache.avro.io.Encoder out)
                   throws java.io.IOException

Specified by:

internalWrite in interface DeterministicMapOrderDatumWriter

Throws:

java.io.IOException

writeMap

protected void writeMap(org.apache.avro.Schema schema,
                        java.lang.Object datum,
                        org.apache.avro.io.Encoder out)
                 throws java.io.IOException

Overrides:

writeMap in class org.apache.avro.generic.GenericDatumWriter<T>

Throws:

java.io.IOException