Module org.apache.jena.core

Package org.apache.jena.rdf.model

Interface NodeIterator

All Superinterfaces:

ClosableIterator<RDFNode>, org.apache.jena.atlas.lib.Closeable, ExtendedIterator<RDFNode>, Iterator<RDFNode>, org.apache.jena.atlas.iterator.IteratorCloseable<RDFNode>

All Known Implementing Classes:

ContNodeIteratorImpl, NodeIteratorImpl, SeqNodeIteratorImpl

public interface NodeIterator
extends ExtendedIterator<RDFNode>

An iterator which returns RDF nodes.

RDF iterators are standard Java iterators, except that they have an extra method that returns specifically typed objects, in this case RDF nodes, and have a close() method. that should be called to free resources if the application does not complete the iteration.

Method Summary

Modifier and Type	Method	Description
void	close()	Terminate the iteration and free up resources.
boolean	hasNext()	Determine if there any more values in the iteration.
RDFNode	next()	Return the next RDFNode of the iteration.
RDFNode	nextNode()	Return the next RDFNode of the iteration.
void	remove()	Unsupported Operation.

Methods inherited from interface org.apache.jena.util.iterator.ExtendedIterator

andThen, filterDrop, filterKeep, forEach, mapWith, nextOptional, removeNext, toList, toSet

Methods inherited from interface java.util.Iterator

forEachRemaining

Method Details

hasNext

boolean hasNext()

Determine if there any more values in the iteration.

Specified by:

hasNext in interface Iterator<RDFNode>

Returns:

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

next

RDFNode next()
      throws NoSuchElementException

Return the next RDFNode of the iteration.

Specified by:

next in interface Iterator<RDFNode>

Returns:

The next RDFNode from the iteration.

Throws:

NoSuchElementException - if there are no more nodes to be returned.

nextNode

RDFNode nextNode()
          throws NoSuchElementException

Return the next RDFNode of the iteration.

Returns:

The next RDFNode from the iteration.

Throws:

NoSuchElementException - if there are no more nodes to be returned.

remove

void remove()
     throws NoSuchElementException

Unsupported Operation.

Specified by:

remove in interface Iterator<RDFNode>

Throws:

NoSuchElementException

close

void close()

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 ClosableIterator<RDFNode>

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable