Package org.eclipse.rdf4j.federated.evaluation.iterator

Class PrintingIteration

java.lang.Object

org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<BindingSet,QueryEvaluationException>

org.eclipse.rdf4j.federated.evaluation.iterator.PrintingIteration

All Implemented Interfaces:

AutoCloseable, CloseableIteration<BindingSet,QueryEvaluationException>, Iteration<BindingSet,QueryEvaluationException>

public class PrintingIteration
extends AbstractCloseableIteration<BindingSet,QueryEvaluationException>

Print the bindings of the inner iteration to stdout, however maintain a copy, which is accessible through this iteration.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field	Description
protected LinkedList<BindingSet>	copyQueue
protected boolean	done
protected final CloseableIteration<BindingSet,QueryEvaluationException>	inner

Constructor Summary

Constructors

Constructor	Description
PrintingIteration(CloseableIteration<BindingSet,QueryEvaluationException> inner)

Method Summary

Modifier and Type	Method	Description
protected void	handleClose()	Called by AbstractCloseableIteration.close() when it is called for the first time.
boolean	hasNext()	Returns true if the iteration has more elements.
BindingSet	next()	Returns the next element in the iteration.
void	print()
void	remove()	Removes from the underlying collection the last element returned by the iteration (optional operation).

Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration

close, isClosed

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration

stream

Field Details

inner

protected final CloseableIteration<BindingSet,QueryEvaluationException> inner

copyQueue

protected LinkedList<BindingSet> copyQueue

done

protected boolean done

Constructor Details

PrintingIteration

public PrintingIteration(CloseableIteration<BindingSet,QueryEvaluationException> inner)

Method Details

print

public void print()
           throws QueryEvaluationException

Throws:

QueryEvaluationException

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Description copied from interface: Iteration

Returns true if the iteration has more elements. (In other words, returns true if Iteration.next() would return an element rather than throwing a NoSuchElementException.)

Returns:

true if the iteration has more elements.

Throws:

QueryEvaluationException

next

public BindingSet next()
                throws QueryEvaluationException

Description copied from interface: Iteration

Returns the next element in the iteration.

Returns:

the next element in the iteration.

Throws:

QueryEvaluationException

remove

public void remove()
            throws QueryEvaluationException

Description copied from interface: Iteration

Removes from the underlying collection the last element returned by the iteration (optional operation). This method can be called only once per call to next.

Throws:

QueryEvaluationException

handleClose

protected void handleClose()
                    throws QueryEvaluationException

Description copied from class: AbstractCloseableIteration

Called by AbstractCloseableIteration.close() when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.

Overrides:

handleClose in class AbstractCloseableIteration<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException