Class IntersectIteration<E>
java.lang.Object
org.eclipse.rdf4j.common.iteration.FilterIteration<E>
org.eclipse.rdf4j.common.iteration.IntersectIteration<E>
- All Implemented Interfaces:
AutoCloseable
,Iterator<E>
,CloseableIteration<E>
An Iteration that returns the intersection of the results of two Iterations. Optionally, the Iteration can be
configured to filter duplicates from the returned elements.
Note that duplicates can also be filtered by wrapping this Iteration in a DistinctIteration
, but that has a
bit more overhead as it adds a second hash table lookup.
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Field Summary
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Constructor Summary
ConstructorDescriptionIntersectIteration
(CloseableIteration<? extends E> arg1, CloseableIteration<? extends E> arg2) Creates a new IntersectIteration that returns the intersection of the results of two Iterations.IntersectIteration
(CloseableIteration<? extends E> arg1, CloseableIteration<? extends E> arg2, boolean distinct) Creates a new IntersectIteration that returns the intersection of the results of two Iterations.IntersectIteration
(CloseableIteration<? extends E> arg1, CloseableIteration<? extends E> arg2, boolean distinct, Supplier<Set<E>> setMaker) Creates a new IntersectIteration that returns the intersection of the results of two Iterations.IntersectIteration
(CloseableIteration<? extends E> arg1, CloseableIteration<? extends E> arg2, Supplier<Set<E>> setMaker) -
Method Summary
Modifier and TypeMethodDescriptionprotected boolean
Returns true if the object is in the set of elements of the second argument.protected void
Closes this Iteration and also closes the wrapped Iteration if it is aCloseableIteration
.protected boolean
inIncludeSet
(E object) makeSet()
protected boolean
removeFromIncludeSet
(E object) Methods inherited from class org.eclipse.rdf4j.common.iteration.FilterIteration
close, hasNext, next, remove
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
Methods inherited from interface java.util.Iterator
forEachRemaining
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Field Details
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arg2
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Constructor Details
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IntersectIteration
public IntersectIteration(CloseableIteration<? extends E> arg1, CloseableIteration<? extends E> arg2) Creates a new IntersectIteration that returns the intersection of the results of two Iterations. By default, duplicates are not filtered from the results.- Parameters:
arg1
- An Iteration containing the first set of elements.arg2
- An Iteration containing the second set of elements.
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IntersectIteration
public IntersectIteration(CloseableIteration<? extends E> arg1, CloseableIteration<? extends E> arg2, Supplier<Set<E>> setMaker) -
IntersectIteration
public IntersectIteration(CloseableIteration<? extends E> arg1, CloseableIteration<? extends E> arg2, boolean distinct) Creates a new IntersectIteration that returns the intersection of the results of two Iterations.- Parameters:
arg1
- An Iteration containing the first set of elements.arg2
- An Iteration containing the second set of elements.distinct
- Flag indicating whether duplicate elements should be filtered from the result.
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IntersectIteration
public IntersectIteration(CloseableIteration<? extends E> arg1, CloseableIteration<? extends E> arg2, boolean distinct, Supplier<Set<E>> setMaker) Creates a new IntersectIteration that returns the intersection of the results of two Iterations.- Parameters:
arg1
- An Iteration containing the first set of elements.arg2
- An Iteration containing the second set of elements.distinct
- Flag indicating whether duplicate elements should be filtered from the result.
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Method Details
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accept
Returns true if the object is in the set of elements of the second argument.- Specified by:
accept
in classFilterIteration<E>
- Parameters:
object
- The object to be tested.- Returns:
- true if the object should be returned, false otherwise.
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removeFromIncludeSet
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inIncludeSet
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makeSet
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handleClose
protected void handleClose()Description copied from class:FilterIteration
Closes this Iteration and also closes the wrapped Iteration if it is aCloseableIteration
.- Specified by:
handleClose
in classFilterIteration<E>
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