org.openrdf.sesame.sailimpl.rdbms.iterators
Class RdbmsValueIterator

java.lang.Object
  org.openrdf.sesame.sailimpl.rdbms.iterators.RdbmsValueIterator

All Implemented Interfaces:

ValueIterator

Direct Known Subclasses:

RdbmsLiteralIterator, RdbmsResourceIterator

public abstract class RdbmsValueIterator

extends Object

implements ValueIterator

A ResourceIterator that executes an SQL query. RdbmsValueIterator is an abstract class, no instances of RdbmsValueIterator can be created. A subclass of RdbmsValueIterator is defined that either iterates rdfs:Resources or rdfs:Literals. This subclass must implement getResult(), the implementation of getResult() must call the proper contructor of either rdfs:Resource or rdfs:Literal.

Version:

$Revision: 1.6.4.2 $

Author:

Peter van 't Hof, Arjohn Kampman

Constructor Summary

RdbmsValueIterator(RdfSource source, String[] namespaceNames, Connection databaseCon, String query)
Constructor.

Method Summary

void	close() Closes the iterator and frees any resources that it uses (e.g.
boolean	hasNext() Checks whether there are any more values available.
Value	next() Gets the next value.

Methods inherited from class java.lang.Object

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

Constructor Detail

RdbmsValueIterator

public RdbmsValueIterator(RdfSource source,
                          String[] namespaceNames,
                          Connection databaseCon,
                          String query)

Constructor.

Parameters:

databaseCon - connection to the repository

query - to execute

Method Detail

hasNext

public boolean hasNext()

Description copied from interface: ValueIterator

Checks whether there are any more values available.

Specified by:

hasNext in interface ValueIterator

Returns:

true if there are more values available, false otherwise.

next

public Value next()

Description copied from interface: ValueIterator

Gets the next value.

Specified by:

next in interface ValueIterator

Returns:

the next value.

close

public void close()

Description copied from interface: ValueIterator

Closes the iterator and frees any resources that it uses (e.g. connections to databases). Every ValueIterator should be properly closed when it has returned all of its values, or when it is no longer needed.

Specified by:

close in interface ValueIterator