org.neo4j.helpers.collection
Class NestingIterator<T,U>

java.lang.Object
  org.neo4j.helpers.collection.PrefetchingIterator<T>
      org.neo4j.helpers.collection.NestingIterator<T,U>

Type Parameters:

T - the type of items to return

U - the type of items in the surface item iterator

All Implemented Interfaces:

Iterator<T>

public abstract class NestingIterator<T,U>
extends PrefetchingIterator<T>

Concatenates sub-iterators of an iterator. Iterates through each item in an iterator. For each item, the createNestedIterator(Object) is invoked to create a sub-iterator. The resulting iterator iterates over each item in each sub-iterator. In effect flattening the iteration.

Constructor Summary

NestingIterator(Iterator<U> source)

Method Summary

protected abstract Iterator<T>	createNestedIterator(U item)
protected T	fetchNextOrNull()
U	getCurrentSurfaceItem()

Methods inherited from class org.neo4j.helpers.collection.PrefetchingIterator

getPrefetchedNextOrNull, hasNext, next, remove, setPrefetchedNext

Methods inherited from class java.lang.Object

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

Constructor Detail

NestingIterator

public NestingIterator(Iterator<U> source)

Method Detail

createNestedIterator

protected abstract Iterator<T> createNestedIterator(U item)

getCurrentSurfaceItem

public U getCurrentSurfaceItem()

fetchNextOrNull

protected T fetchNextOrNull()

Specified by:

fetchNextOrNull in class PrefetchingIterator<T>