uk.ac.leeds.ccg.andyt.grids.utilities
Class ListIteratorAbstract<E>

java.lang.Object
  uk.ac.leeds.ccg.andyt.grids.utilities.ListIteratorAbstract<E>

All Implemented Interfaces:

java.util.Iterator<E>, java.util.ListIterator<E>

public abstract class ListIteratorAbstract<E>
extends java.lang.Object
implements java.util.ListIterator<E>

A basic wrapper for the interface.

Constructor Summary

ListIteratorAbstract()

Method Summary

abstract void	add(E o) Inserts the specified element into the list (optional operation).
abstract boolean	hasNext() Returns true if this list iterator has more elements when traversing the list in the forward direction.
abstract boolean	hasPrevious() Returns true if this list iterator has more elements when traversing the list in the reverse direction.
abstract E	next() Returns the next element in the list.
abstract int	nextIndex() Returns the index of the element that would be returned by a subsequent call to next.
abstract E	previous() Returns the previous element in the list.
abstract int	previousIndex() Returns the index of the element that would be returned by a subsequent call to previous.
abstract void	remove() Removes from the list the last element that was returned by next or previous (optional operation).
abstract void	set(E o) Replaces the last element returned by next or previous with the specified element (optional operation).

Methods inherited from class java.lang.Object

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

Constructor Detail

ListIteratorAbstract

public ListIteratorAbstract()

Method Detail

hasNext

public abstract boolean hasNext()

Returns true if this list iterator has more elements when traversing the list in the forward direction. (In other words, returns true if next would return an element rather than throwing an exception.)

Specified by:

hasNext in interface java.util.Iterator<E>

Specified by:

hasNext in interface java.util.ListIterator<E>

Returns:

true if the list iterator has more elements when traversing the list in the forward direction.

next

public abstract E next()

Returns the next element in the list. This method may be called repeatedly to iterate through the list, or intermixed with calls to previous to go back and forth. (Note that alternating calls to next and previous will return the same element repeatedly.)

Specified by:

next in interface java.util.Iterator<E>

Specified by:

next in interface java.util.ListIterator<E>

Returns:

the next element in the list.

Throws:

NoSuchElementException - if the iteration has no next element.

hasPrevious

public abstract boolean hasPrevious()

Returns true if this list iterator has more elements when traversing the list in the reverse direction. (In other words, returns true if previous would return an element rather than throwing an exception.)

Specified by:

hasPrevious in interface java.util.ListIterator<E>

Returns:

true if the list iterator has more elements when traversing the list in the reverse direction.

previous

public abstract E previous()

Returns the previous element in the list. This method may be called repeatedly to iterate through the list backwards, or intermixed with calls to next to go back and forth. (Note that alternating calls to next and previous will return the same element repeatedly.)

Specified by:

previous in interface java.util.ListIterator<E>

Returns:

the previous element in the list.

Throws:

NoSuchElementException - if the iteration has no previous element.

nextIndex

public abstract int nextIndex()

Returns the index of the element that would be returned by a subsequent call to next. (Returns list size if the list iterator is at the end of the list.)

Specified by:

nextIndex in interface java.util.ListIterator<E>

Returns:

the index of the element that would be returned by a subsequent call to next, or list size if list iterator is at end of list.

previousIndex

public abstract int previousIndex()

Returns the index of the element that would be returned by a subsequent call to previous. (Returns -1 if the list iterator is at the beginning of the list.)

Specified by:

previousIndex in interface java.util.ListIterator<E>

Returns:

the index of the element that would be returned by a subsequent call to previous, or -1 if list iterator is at beginning of list.

remove

public abstract void remove()

Removes from the list the last element that was returned by next or previous (optional operation). This call can only be made once per call to next or previous. It can be made only if ListIterator.add has not been called after the last call to next or previous.

Specified by:

remove in interface java.util.Iterator<E>

Specified by:

remove in interface java.util.ListIterator<E>

Throws:

java.lang.UnsupportedOperationException - if the remove operation is not supported by this list iterator.

java.lang.IllegalStateException - neither next nor previous have been called, or remove or add have been called after the last call to * next or previous.

set

public abstract void set(E o)

Replaces the last element returned by next or previous with the specified element (optional operation). This call can be made only if neither ListIterator.remove nor ListIterator.add have been called after the last call to next or previous.

Specified by:

set in interface java.util.ListIterator<E>

Parameters:

o - the element with which to replace the last element returned by next or previous.

Throws:

java.lang.UnsupportedOperationException - if the set operation is not supported by this list iterator.

java.lang.ClassCastException - if the class of the specified element prevents it from being added to this list.

java.lang.IllegalArgumentException - if some aspect of the specified element prevents it from being added to this list.

java.lang.IllegalStateException - if neither next nor previous have been called, or remove or add have been called after the last call to next or previous.

add

public abstract void add(E o)

Inserts the specified element into the list (optional operation). The element is inserted immediately before the next element that would be returned by next, if any, and after the next element that would be returned by previous, if any. (If the list contains no elements, the new element becomes the sole element on the list.) The new element is inserted before the implicit cursor: a subsequent call to next would be unaffected, and a subsequent call to previous would return the new element. (This call increases by one the value that would be returned by a call to nextIndex or previousIndex.)

Specified by:

add in interface java.util.ListIterator<E>

Parameters:

o - the element to insert.

Throws:

java.lang.UnsupportedOperationException - if the add method is not supported by this list iterator.

java.lang.ClassCastException - if the class of the specified element prevents it from being added to this list.

java.lang.IllegalArgumentException - if some aspect of this element prevents it from being added to this list.