com.bigdata.rdf.lexicon

Class ReverseIndexWriterTask

java.lang.Object

com.bigdata.rdf.lexicon.ReverseIndexWriterTask

All Implemented Interfaces:

Callable<Long>

public class ReverseIndexWriterTask
extends Object
implements Callable<Long>

Add terms to the reverse index, which is the index that we use to lookup the RDF value by its term identifier so that we can externalize ISPOs as RDF/XML or the like.

Note: Every term asserted against the forward mapping [terms] MUST be asserted against the reverse mapping [ids] EVERY time. This is required in order to guarantee that the reverse index remains complete and consistent. Otherwise a client that writes on the terms index and fails before writing on the ids index would cause those terms to remain undefined in the reverse index.

Constructor Summary

Constructors

Constructor and Description
ReverseIndexWriterTask(IIndex idTermIndex, BigdataValueFactory valueFactory, KVO<BigdataValue>[] a, int ndistinct, boolean storeBlankNodes)

Method Summary

Methods

Modifier and Type	Method and Description
Long	call()

Methods inherited from class java.lang.Object

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

Constructor Detail

ReverseIndexWriterTask

public ReverseIndexWriterTask(IIndex idTermIndex,
                      BigdataValueFactory valueFactory,
                      KVO<BigdataValue>[] a,
                      int ndistinct,
                      boolean storeBlankNodes)

Parameters:

idTermIndex - The index on which to write the data.

valueFactory - This determines how the Value objects are serialized on the index.

a - The terms (in sorted order by their term identifiers).

ndistinct - The #of elements in a.

Method Detail

call

public Long call()
          throws Exception

Specified by:

call in interface Callable<Long>

Returns:

the elapsed time for this task.

Throws:

Exception