org.apache.asterix.metadata.entitytupletranslators

Class DatasetTupleTranslator

java.lang.Object

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

org.apache.asterix.metadata.entitytupletranslators.DatasetTupleTranslator

All Implemented Interfaces:

IMetadataEntityTupleTranslator<Dataset>

public class DatasetTupleTranslator
extends AbstractTupleTranslator<Dataset>

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

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.hyracks.api.dataflow.value.ISerializerDeserializer<AInt32>	aInt32Serde
static int	DATASET_DATASETNAME_TUPLE_FIELD_INDEX
static int	DATASET_DATAVERSENAME_TUPLE_FIELD_INDEX
static int	DATASET_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
DatasetTupleTranslator(boolean getTuple)

Method Summary

Methods

Modifier and Type	Method and Description
Dataset	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(Dataset dataset) 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

DATASET_DATAVERSENAME_TUPLE_FIELD_INDEX

public static final int DATASET_DATAVERSENAME_TUPLE_FIELD_INDEX

See Also:

Constant Field Values

DATASET_DATASETNAME_TUPLE_FIELD_INDEX

public static final int DATASET_DATASETNAME_TUPLE_FIELD_INDEX

See Also:

Constant Field Values

DATASET_PAYLOAD_TUPLE_FIELD_INDEX

public static final int DATASET_PAYLOAD_TUPLE_FIELD_INDEX

See Also:

Constant Field Values

aInt32Serde

protected org.apache.hyracks.api.dataflow.value.ISerializerDeserializer<AInt32> aInt32Serde

Constructor Detail

DatasetTupleTranslator

public DatasetTupleTranslator(boolean getTuple)

Method Detail

getMetadataEntityFromTuple

public Dataset getMetadataEntityFromTuple(org.apache.hyracks.dataflow.common.data.accessors.ITupleReference frameTuple)
                                   throws 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:

IOException

getTupleFromMetadataEntity

public org.apache.hyracks.dataflow.common.data.accessors.ITupleReference getTupleFromMetadataEntity(Dataset dataset)
                                                                                             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:

dataset - Metadata entity to be written into a tuple.

Throws:

IOException

MetadataException