org.apache.asterix.metadata.entitytupletranslators

Class DatatypeTupleTranslator

java.lang.Object

org.apache.asterix.metadata.entitytupletranslators.AbstractTupleTranslator<Datatype>

org.apache.asterix.metadata.entitytupletranslators.DatatypeTupleTranslator

All Implemented Interfaces:

IMetadataEntityTupleTranslator<Datatype>

public class DatatypeTupleTranslator
extends AbstractTupleTranslator<Datatype>

Translates a Datatype metadata entity to an ITupleReference and vice versa.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DatatypeTupleTranslator.DerivedTypeTag

Field Summary

Fields

Modifier and Type	Field and Description
static int	DATATYPE_DATATYPE_TUPLE_FIELD_INDEX
static int	DATATYPE_DATAVERSENAME_TUPLE_FIELD_INDEX
static int	DATATYPE_PAYLOAD_TUPLE_FIELD_INDEX

Fields inherited from class org.apache.asterix.metadata.entitytupletranslators.AbstractTupleTranslator

aString, booleanSerde, fieldValue, int32Serde, recordBuilder, stringSerde, tuple, tupleBuilder

Constructor Summary

Constructors

Constructor and Description
DatatypeTupleTranslator(JobId jobId, MetadataNode metadataNode, boolean getTuple)

Method Summary

Methods

Modifier and Type	Method and Description
Datatype	getMetadataEntityFromTuple(org.apache.hyracks.dataflow.common.data.accessors.ITupleReference frameTuple) Transforms a metadata entity of type T from a given tuple to a Java object (deserializing the appropriate field(s) in the tuple as necessary).
org.apache.hyracks.dataflow.common.data.accessors.ITupleReference	getTupleFromMetadataEntity(Datatype dataType) Serializes the given metadata entity of type T into an appropriate tuple representation (i.e., some number of fields containing bytes).

Methods inherited from class java.lang.Object

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

Field Detail

DATATYPE_DATAVERSENAME_TUPLE_FIELD_INDEX

public static final int DATATYPE_DATAVERSENAME_TUPLE_FIELD_INDEX

See Also:

Constant Field Values

DATATYPE_DATATYPE_TUPLE_FIELD_INDEX

public static final int DATATYPE_DATATYPE_TUPLE_FIELD_INDEX

See Also:

Constant Field Values

DATATYPE_PAYLOAD_TUPLE_FIELD_INDEX

public static final int DATATYPE_PAYLOAD_TUPLE_FIELD_INDEX

See Also:

Constant Field Values

Constructor Detail

DatatypeTupleTranslator

public DatatypeTupleTranslator(JobId jobId,
                       MetadataNode metadataNode,
                       boolean getTuple)

Method Detail

getMetadataEntityFromTuple

public Datatype getMetadataEntityFromTuple(org.apache.hyracks.dataflow.common.data.accessors.ITupleReference frameTuple)
                                    throws MetadataException,
                                           IOException

Description copied from interface: IMetadataEntityTupleTranslator

Transforms a metadata entity of type T from a given tuple to a Java object (deserializing the appropriate field(s) in the tuple as necessary).

Parameters:

frameTuple - Tuple containing a serialized representation of a metadata entity of type T.

Returns:

A new instance of a metadata entity of type T.

Throws:

MetadataException

IOException

getTupleFromMetadataEntity

public org.apache.hyracks.dataflow.common.data.accessors.ITupleReference getTupleFromMetadataEntity(Datatype dataType)
                                                                                             throws IOException,
                                                                                                    MetadataException

Description copied from interface: IMetadataEntityTupleTranslator

Serializes the given metadata entity of type T into an appropriate tuple representation (i.e., some number of fields containing bytes).

Parameters:

dataType - Metadata entity to be written into a tuple.

Throws:

IOException

MetadataException