Class ConvertingIteration<S,T>
- java.lang.Object
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- org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<T>
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- org.eclipse.rdf4j.common.iteration.ConvertingIteration<S,T>
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- All Implemented Interfaces:
AutoCloseable
,Iterator<T>
,CloseableIteration<T>
- Direct Known Subclasses:
BoundJoinConversionIteration
,BoundJoinVALUESConversionIteration
,ExtensionIterator
,GroupedCheckConversionIteration
,InsertBindingsIteration
,ProjectionIterator
,ServiceJoinConversionIteration
public abstract class ConvertingIteration<S,T> extends AbstractCloseableIteration<T>
A CloseableIteration that converts an iteration over objects of type S (the source type) to an iteration over objects of type T (the target type).
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Constructor Summary
Constructors Modifier Constructor Description protected
ConvertingIteration(CloseableIteration<? extends S> iter)
Creates a new ConvertingIteration that operates on the supplied source type iteration.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description protected abstract T
convert(S sourceObject)
Converts a source type object to a target type object.protected void
handleClose()
Closes this iteration as well as the wrapped iteration if it is aCloseableIteration
.boolean
hasNext()
Checks whether the source type iteration contains more elements.T
next()
Returns the next element from the source type iteration.void
remove()
Calls remove() on the underlying Iteration.-
Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration
close, isClosed
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration
stream
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Methods inherited from interface java.util.Iterator
forEachRemaining
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Constructor Detail
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ConvertingIteration
protected ConvertingIteration(CloseableIteration<? extends S> iter)
Creates a new ConvertingIteration that operates on the supplied source type iteration.- Parameters:
iter
- The source type iteration for this ConvertingIteration, must not be null.
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Method Detail
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convert
protected abstract T convert(S sourceObject)
Converts a source type object to a target type object.
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hasNext
public final boolean hasNext()
Checks whether the source type iteration contains more elements.- Returns:
- true if the source type iteration contains more elements, false otherwise.
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next
public final T next()
Returns the next element from the source type iteration.- Throws:
NoSuchElementException
- If all elements have been returned.IllegalStateException
- If the iteration has been closed.
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remove
public final void remove()
Calls remove() on the underlying Iteration.- Throws:
UnsupportedOperationException
- If the wrapped Iteration does not support the remove operation.IllegalStateException
- If the Iteration has been closed, or ifnext()
has not yet been called, orremove()
has already been called after the last call tonext()
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handleClose
protected void handleClose()
Closes this iteration as well as the wrapped iteration if it is aCloseableIteration
.- Specified by:
handleClose
in classAbstractCloseableIteration<T>
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