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## 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>`

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