org.apache.flink.formats.avro

Class AvroDeserializationSchema<T>

java.lang.Object

org.apache.flink.formats.avro.AvroDeserializationSchema<T>

Type Parameters:

T - type of record it produces

All Implemented Interfaces:

Serializable, DeserializationSchema<T>, ResultTypeQueryable<T>

Direct Known Subclasses:

RegistryAvroDeserializationSchema

public class AvroDeserializationSchema<T>
extends Object
implements DeserializationSchema<T>

Deserialization schema that deserializes from Avro binary format.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.api.common.serialization.DeserializationSchema

DeserializationSchema.InitializationContext

Method Summary

Modifier and Type	Method and Description
T	deserialize(byte[] message) Deserializes the byte message.
boolean	equals(Object o)
static AvroDeserializationSchema<org.apache.avro.generic.GenericRecord>	forGeneric(org.apache.avro.Schema schema) Creates AvroDeserializationSchema that produces GenericRecord using provided schema.
static <T extends org.apache.avro.specific.SpecificRecord> AvroDeserializationSchema<T>	forSpecific(Class<T> tClass) Creates AvroDeserializationSchema that produces classes that were generated from avro schema.
TypeInformation<T>	getProducedType() Gets the data type (as a TypeInformation) produced by this function or input format.
int	hashCode()
boolean	isEndOfStream(T nextElement) Method to decide whether the element signals the end of the stream.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.api.common.serialization.DeserializationSchema

deserialize, open

Method Detail

forGeneric

public static AvroDeserializationSchema<org.apache.avro.generic.GenericRecord> forGeneric(org.apache.avro.Schema schema)

Creates AvroDeserializationSchema that produces GenericRecord using provided schema.

Parameters:

schema - schema of produced records

Returns:

deserialized record in form of GenericRecord

forSpecific

public static <T extends org.apache.avro.specific.SpecificRecord> AvroDeserializationSchema<T> forSpecific(Class<T> tClass)

Creates AvroDeserializationSchema that produces classes that were generated from avro schema.

Parameters:

tClass - class of record to be produced

Returns:

deserialized record

deserialize

public T deserialize(@Nullable
                     byte[] message)
              throws IOException

Description copied from interface: DeserializationSchema

Deserializes the byte message.

Specified by:

deserialize in interface DeserializationSchema<T>

Parameters:

message - The message, as a byte array.

Returns:

The deserialized message as an object (null if the message cannot be deserialized).

Throws:

IOException

isEndOfStream

public boolean isEndOfStream(T nextElement)

Description copied from interface: DeserializationSchema

Method to decide whether the element signals the end of the stream. If true is returned the element won't be emitted.

Specified by:

isEndOfStream in interface DeserializationSchema<T>

Parameters:

nextElement - The element to test for the end-of-stream signal.

Returns:

True, if the element signals end of stream, false otherwise.

getProducedType

public TypeInformation<T> getProducedType()

Description copied from interface: ResultTypeQueryable

Gets the data type (as a TypeInformation) produced by this function or input format.

Specified by:

getProducedType in interface ResultTypeQueryable<T>

Returns:

The data type produced by this function or input format.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object