com.bigdata.rdf.lexicon

Class BlobsTupleSerializer

java.lang.Object

com.bigdata.btree.DefaultTupleSerializer<IV,BigdataValue>

com.bigdata.rdf.lexicon.BlobsTupleSerializer

All Implemented Interfaces:

ITupleSerializer<IV,BigdataValue>, IKeyBuilderFactory, Externalizable, Serializable

public class BlobsTupleSerializer
extends DefaultTupleSerializer<IV,BigdataValue>

Encapsulates key and value formation for the TERMS index. The keys are BlobIVs. The values are BigdataValues serialized using the BigdataValueSerializer. Large values are converted to raw records and must be materialized before they can be deserialized.

Version:

$Id$

Author:

Bryan Thompson

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
BlobsTupleSerializer() De-serialization ctor.
BlobsTupleSerializer(String namespace, BigdataValueFactory valueFactory)

Method Summary

Methods

Modifier and Type	Method and Description
BigdataValue	deserialize(ITuple tuple) De-serializes the ITuple as a BigdataValue, including the term identifier extracted from the unsigned byte[] key, and sets the appropriate BigdataValueFactoryImpl reference on that object.
IV	deserializeKey(ITuple tuple) Decodes the key to a BlobIV.
void	readExternal(ObjectInput in)
byte[]	serializeKey(Object obj) Return the unsigned byte[] key for a BlobIV.
byte[]	serializeVal(BigdataValue obj) Return the byte[] value, which is the serialization of an RDF Value using the BigdataValueSerializer.
void	writeExternal(ObjectOutput out)

Methods inherited from class com.bigdata.btree.DefaultTupleSerializer

getDefaultKeyBuilderFactory, getDefaultLeafKeysCoder, getDefaultValuesCoder, getKeyBuilder, getLeafKeysCoder, getLeafValuesCoder, getPrimaryKeyBuilder, newInstance, setLeafKeysCoder, setLeafValuesCoder, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

BlobsTupleSerializer

public BlobsTupleSerializer()

De-serialization ctor.

BlobsTupleSerializer

public BlobsTupleSerializer(String namespace,
                    BigdataValueFactory valueFactory)

Parameters:

keyBuilderFactory - A factory that does not support unicode and has an initialCapacity of .

Method Detail

deserializeKey

public IV deserializeKey(ITuple tuple)

Decodes the key to a BlobIV.

Specified by:

deserializeKey in interface ITupleSerializer<IV,BigdataValue>

Overrides:

deserializeKey in class DefaultTupleSerializer<IV,BigdataValue>

Parameters:

key - The key for an entry in the TERMS index.

Returns:

The BlobIV.

serializeKey

public byte[] serializeKey(Object obj)

Return the unsigned byte[] key for a BlobIV.

Specified by:

serializeKey in interface ITupleSerializer<IV,BigdataValue>

Overrides:

serializeKey in class DefaultTupleSerializer<IV,BigdataValue>

Parameters:

obj - The BlobIV.

Returns:

An unsigned byte[] which places the object into the total sort order for the index and never null ( null keys are not allowed into an index).

serializeVal

public byte[] serializeVal(BigdataValue obj)

Return the byte[] value, which is the serialization of an RDF Value using the BigdataValueSerializer.

Specified by:

serializeVal in interface ITupleSerializer<IV,BigdataValue>

Overrides:

serializeVal in class DefaultTupleSerializer<IV,BigdataValue>

Parameters:

obj - An RDF Value.

Returns:

The serialized representation of the object as a byte[] -or- null if the reference is null.

deserialize

public BigdataValue deserialize(ITuple tuple)

De-serializes the ITuple as a BigdataValue, including the term identifier extracted from the unsigned byte[] key, and sets the appropriate BigdataValueFactoryImpl reference on that object.

Specified by:

deserialize in interface ITupleSerializer<IV,BigdataValue>

Overrides:

deserialize in class DefaultTupleSerializer<IV,BigdataValue>

Parameters:

tuple - The tuple.

Returns:

The de-serialized object.

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class DefaultTupleSerializer<IV,BigdataValue>

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class DefaultTupleSerializer<IV,BigdataValue>

Throws:

IOException