org.pentaho.reporting.libraries.base.util

Class EmptyIterator<T>

java.lang.Object

org.pentaho.reporting.libraries.base.util.EmptyIterator<T>

All Implemented Interfaces:

Iterator<T>

public final class EmptyIterator<T>
extends Object
implements Iterator<T>

An helper class to implement an empty iterator. This iterator will always return false when hasNext is called.

Field Summary

Fields

Modifier and Type	Field and Description
static Iterator	INSTANCE

Method Summary

Methods

Modifier and Type	Method and Description
static <T> Iterator<T>	emptyIterator()
boolean	hasNext() Returns true if the iteration has more elements.
T	next() Returns the next element in the iteration.
void	remove() Removes from the underlying collection the last element returned by the iterator (optional operation).

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final Iterator INSTANCE

Method Detail

emptyIterator

public static <T> Iterator<T> emptyIterator()

hasNext

public boolean hasNext()

Returns true if the iteration has more elements. (In other words, returns true if next would return an element rather than throwing an exception.)

Specified by:

hasNext in interface Iterator<T>

Returns:

true if the iterator has more elements.

next

public T next()

Returns the next element in the iteration.

Specified by:

next in interface Iterator<T>

Returns:

the next element in the iteration.

Throws:

NoSuchElementException - iteration has no more elements.

remove

public void remove()

Removes from the underlying collection the last element returned by the iterator (optional operation). This method can be called only once per call to next. The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method.

Specified by:

remove in interface Iterator<T>

Throws:

UnsupportedOperationException - if the remove operation is not supported by this Iterator.

IllegalStateException - if the next method has not yet been called, or the remove method has already been called after the last call to the next method.