com.bigdata.rdf.lexicon
Class Term2IdTupleSerializer

java.lang.Object
  com.bigdata.btree.DefaultTupleSerializer
      com.bigdata.rdf.lexicon.Term2IdTupleSerializer

All Implemented Interfaces:

ITupleSerializer, IKeyBuilderFactory, Externalizable, Serializable

public class Term2IdTupleSerializer
extends DefaultTupleSerializer

Handles the term:id index (forward mapping for the lexicon). The keys are unsigned byte[]s representing a total order for the RDF Value space. The index assigns term identifiers, and those term identifiers are stored in the values of the index.

Version:

$Id: Term2IdTupleSerializer.java 4818 2011-06-29 20:01:56Z thompsonbry $

Author:

Bryan Thompson

See Also:

Serialized Form

Constructor Summary

Term2IdTupleSerializer()
De-serialization ctor.

Term2IdTupleSerializer(IKeyBuilderFactory keyBuilderFactory)
Uses the caller's IKeyBuilderFactory.

Term2IdTupleSerializer(Properties properties)
Configures the IKeyBuilderFactory from the caller's properties.

Method Summary

IV	deserialize(ITuple tuple) De-serializes the ITuple as a IV whose value is the term identifier associated with the key.
Object	deserializeKey(ITuple tuple) You can not decode the term:id keys since they include Unicode sort keys and that is a lossy transform.
LexiconKeyBuilder	getLexiconKeyBuilder() Thread-local object for constructing keys for the lexicon.
void	readExternal(ObjectInput in)
byte[]	serializeKey(Object obj) Return the unsigned byte[] key for an RDF Value.
byte[]	serializeVal(Object obj) Return the byte[] value, which is a term identifier written as a packed long integer.
void	writeExternal(ObjectOutput out)

Methods inherited from class com.bigdata.btree.DefaultTupleSerializer

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Term2IdTupleSerializer

public Term2IdTupleSerializer()

De-serialization ctor.

Term2IdTupleSerializer

public Term2IdTupleSerializer(Properties properties)

Configures the IKeyBuilderFactory from the caller's properties.

Parameters:

properties -

Term2IdTupleSerializer

public Term2IdTupleSerializer(IKeyBuilderFactory keyBuilderFactory)

Uses the caller's IKeyBuilderFactory.

Parameters:

keyBuilderFactory -

Method Detail

getLexiconKeyBuilder

public LexiconKeyBuilder getLexiconKeyBuilder()

Thread-local object for constructing keys for the lexicon.

deserializeKey

public Object deserializeKey(ITuple tuple)

You can not decode the term:id keys since they include Unicode sort keys and that is a lossy transform.

Specified by:

deserializeKey in interface ITupleSerializer

Overrides:

deserializeKey in class DefaultTupleSerializer

Throws:

UnsupportedOperationException - always

serializeKey

public byte[] serializeKey(Object obj)

Return the unsigned byte[] key for an RDF Value.

Specified by:

serializeKey in interface ITupleSerializer

Overrides:

serializeKey in class DefaultTupleSerializer

Parameters:

obj - The RDF Value.

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(Object obj)

Return the byte[] value, which is a term identifier written as a packed long integer.

Specified by:

serializeVal in interface ITupleSerializer

Overrides:

serializeVal in class DefaultTupleSerializer

Parameters:

obj - A term identifier expressed as a TermId.

Returns:

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

deserialize

public IV deserialize(ITuple tuple)

De-serializes the ITuple as a IV whose value is the term identifier associated with the key. The key itself is not decodable.

Specified by:

deserialize in interface ITupleSerializer

Overrides:

deserialize in class DefaultTupleSerializer

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

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class DefaultTupleSerializer

Throws:

IOException