LookAheadIterator (Eclipse RDF4J 4.2.4)

java.lang.Object
- org.eclipse.rdf4j.common.iterator.AbstractCloseableIterator<E>
- - org.eclipse.rdf4j.common.iterator.LookAheadIterator<E>

All Implemented Interfaces:

Closeable, AutoCloseable, Iterator<E>

Direct Known Subclasses:

UnionIterator
```
public abstract class LookAheadIterator<E>
extends AbstractCloseableIterator<E>
```
Author:

MJAHale

Constructor Summary

Constructors
Modifier Constructor Description

protected LookAheadIterator()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract E`	`getNextElement()`	Gets the next element.
`protected void`	`handleAlreadyClosed()`
`protected void`	`handleClose()`	Called by `AbstractCloseableIterator.close()` when it is called for the first time.
`boolean`	`hasNext()`
`E`	`next()`
`void`	`remove()`	Throws an `UnsupportedOperationException`.

Methods inherited from class org.eclipse.rdf4j.common.iterator.AbstractCloseableIterator
close, isClosed

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Iterator
forEachRemaining

- Constructor Detail
  - LookAheadIterator
```
protected LookAheadIterator()
```
- Method Detail
  - getNextElement
```
protected abstract E getNextElement()
```
    Gets the next element. Subclasses should implement this method so that it returns the next element.
    
    Returns:
    
    The next element, or null if no more elements are available.
  - hasNext
```
public final boolean hasNext()
```
  - next
```
public final E next()
```
  - remove
```
public void remove()
```
    Throws an UnsupportedOperationException.
  - handleClose
```
protected void handleClose()
                    throws IOException
```
    Description copied from class: AbstractCloseableIterator
    
    Called by AbstractCloseableIterator.close() when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.
    
    Overrides:
    
    handleClose in class AbstractCloseableIterator<E>
    
    Throws:
    
    IOException
  - handleAlreadyClosed
```
protected void handleAlreadyClosed()
                            throws IOException
```
    Overrides:
    
    handleAlreadyClosed in class AbstractCloseableIterator<E>
    
    Throws:
    
    IOException