Interface Iteration<E,X extends Exception>
-
- Type Parameters:
E- Object type of objects contained in the iteration.X- Exception type that is thrown when a problem occurs during iteration.
- All Known Subinterfaces:
CloseableIteration<E,X>,GraphQueryResult,QueryResult<T>,TupleQueryResult
- All Known Implementing Classes:
AbstractCloseableIteration,AbstractParserQuery.QueryInterruptIteration,AbstractParserQuery.QueryInterruptIteration,BackgroundGraphResult,BackgroundTupleResult,BadlyDesignedLeftJoinIterator,BottomUpJoinIterator,BoundJoinConversionIteration,BoundJoinVALUESConversionIteration,CachedGraphQueryResult,CachedTupleQueryResult,CloseableIteratorIteration,CloseablePeakableIteration,CloseDependentConnectionIteration,CollectionIteration,CollectionIteration,CompatibleBindingSetFilter,ConsumingIteration,ControlledWorkerBoundJoin,ControlledWorkerJoin,ControlledWorkerLeftJoin,ControlledWorkerUnion,ConvertingIteration,CrossProductIteration,DelayedIteration,DescribeIteration,DistinctIteration,DistinctModelReducingUnionIteration,EmptyIteration,ExceptionConvertingIteration,ExtensionIterator,FederatedDescribeIteration,FedXQueueCursor,FilteringInsertBindingsIteration,FilteringIteration,FilteringIteration,FilterIteration,FilterIterator,GraphQueryResultImpl,GraphToBindingSetConversionIteration,GroupedCheckConversionIteration,GroupIterator,HashJoin,HashJoinIteration,IndependentJoingroupBindingsIteration,IndependentJoingroupBindingsIteration2,IndependentJoingroupBindingsIteration3,InsertBindingSetCursor,InsertBindingsIteration,IntersectIteration,IteratingGraphQueryResult,IteratingTupleQueryResult,IterationWrapper,IteratorIteration,JoinExecutorBase,JoinExecutorBase,JoinExecutorBase,JoinIterator,LazyMutableClosableIteration,LeftJoinIterator,LimitedSizeDistinctIteration,LimitIteration,LockingIteration,LoggingCloseableIteration,LookAheadIteration,MemStatementIterator,MinusIteration,MultiProjectionIterator,MutableTupleQueryResult,OffsetIteration,OrderIterator,ParallelExecutorBase,ParallelServiceExecutor,PathIteration,PrintingIteration,ProjectionIterator,QueryContextIteration,QueryEvaluationStep.DelayedEvaluationIteration,QueryResultIteration,QueueCursor,QueueIteration,ReducedIteration,RepositoryExceptionConvertingIteration,RepositoryResult,ReusableGraphQueryResult,ReusableTupleQueryResult,ServiceCrossProductIteration,ServiceJoinConversionIteration,ServiceJoinConversionIteration,ServiceJoinIterator,SilentIteration,SilentIteration,SingleBindingSetIteration,SingletonIteration,SPARQLCrossProductIteration,SPARQLMinusIteration,StatementConversionIteration,StopRemainingExecutionsOnCloseIteration,SynchronousBoundJoin,SynchronousJoin,SynchronousWorkerUnion,TimeLimitIteration,TupleQueryResultImpl,UnionExecutorBase,UnionIteration,WorkerUnionBase,ZeroLengthPathIteration
public interface Iteration<E,X extends Exception>An Iteration is a typed Iterator-like object that can throw (typed) Exceptions while iterating. This is used in cases where the iteration is lazy and evaluates over a (remote) connection, for example accessing a database. In such cases an error can occur at any time and needs to be communicated through a checked exception, somethingIteratorcan not do (it can only throwRuntimeExceptions.- Author:
- jeen, Herko ter Horst
- See Also:
Iterator
-
-
Method Summary
All Methods Instance Methods Abstract Methods Default Methods Modifier and Type Method Description booleanhasNext()Returns true if the iteration has more elements.Enext()Returns the next element in the iteration.voidremove()Removes from the underlying collection the last element returned by the iteration (optional operation).default Stream<E>stream()Convert the results to a Java 8 Stream.
-
-
-
Method Detail
-
hasNext
boolean hasNext() throws X extends ExceptionReturns true if the iteration has more elements. (In other words, returns true ifnext()would return an element rather than throwing a NoSuchElementException.)
-
next
E next() throws X extends Exception
Returns the next element in the iteration.- Returns:
- the next element in the iteration.
- Throws:
NoSuchElementException- if the iteration has no more elements or if it has been closed.X extends Exception
-
remove
void remove() throws X extends ExceptionRemoves 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:
UnsupportedOperationException- if the remove operation is not supported by this Iteration.IllegalStateException- If the Iteration has been closed, or if next() has not yet been called, or remove() has already been called after the last call to next().X extends Exception
-
-