com.hp.hpl.jena.util
Class StatementSubjectIterator

java.lang.Object
  |
  +--com.hp.hpl.jena.util.StatementSubjectIterator

All Implemented Interfaces:

ResIterator

public class StatementSubjectIterator

extends java.lang.Object

implements ResIterator

A wrapper for StmtIterator that projects the subject of the statement to form a ResIterator.

Version:

CVS info: $Id: StatementSubjectIterator.java,v 1.1 2001/09/24 17:02:36 ijd Exp $

Author:

Ian Dickinson, HP Labs (email)

Constructor Summary

StatementSubjectIterator(StmtIterator sIterator)
Construct an iterator to project the subject of the statement out to form a resource iterator.

Method Summary

void	close() Terminate the iteration and free up resources.
boolean	hasNext() Determine if there any more Resources in the iteration.
Resource	next() Return the next Resource of the iteration.
void	remove() Unsupported Operation.

Methods inherited from class java.lang.Object

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

Constructor Detail

StatementSubjectIterator

public StatementSubjectIterator(StmtIterator sIterator)

Construct an iterator to project the subject of the statement out to form a resource iterator.

Parameters:

sIterator - The StmtIterator whose subjects will form the elements of the the resource iterator.

Method Detail

hasNext

public boolean hasNext()
                throws RDFException

Determine if there any more Resources in the iteration.

Specified by:

hasNext in interface ResIterator

Returns:

true if and only if there are more Resources available from the iteration.

Throws:

RDFException - Generic RDF exception.

next

public Resource next()
              throws java.util.NoSuchElementException,
                     RDFException

Return the next Resource of the iteration.

Specified by:

next in interface ResIterator

Returns:

The next Resource from the iteration.

Throws:

java.util.NoSuchElementException - if there are no more to be returned.

RDFException - Generic RDF exception.

remove

public void remove()
            throws java.util.NoSuchElementException,
                   RDFException

Unsupported Operation.

Specified by:

remove in interface ResIterator

Throws:

java.util.NoSuchElementException -

RDFException -

close

public void close()
           throws RDFException

Terminate the iteration and free up resources.

Some implementations, e.g. on relational databases, hold resources while the iterator still exists. These will normally be freed when the iteration completes. However, if an application wishes to ensure they are freed without completing the iteration, this method should be called.

Specified by:

close in interface ResIterator

Throws:

RDFException - Generic RDF exception.