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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections.iterators

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.apache.commons.collections.iterators .ObjectArrayIterator

org.apache.commons.collections.iterators .ObjectArrayListIterator

ObjectArrayListIterator

public class ObjectArrayListIterator extends ObjectArrayIterator implements ListIterator,ResettableListIterator(Code)

Implements a ListIterator over an array of objects.

This iterator does not support ObjectArrayListIterator.add or ObjectArrayListIterator.remove , as the object array cannot be structurally modified. The ObjectArrayListIterator.set method is supported however.

The iterator implements a ObjectArrayListIterator.reset method, allowing the reset of the iterator back to the start if required.
See Also:   org.apache.commons.collections.iterators.ObjectArrayIterator
See Also:   java.util.Iterator
See Also:   java.util.ListIterator
since:
   Commons Collections 3.0
version:
   $Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
author:
   Neil O'Toole
author:
   Stephen Colebourne
author:
   Phil Steitz

Field Summary
protected int	lastItemIndex Holds the index of the last item returned by a call to `next()` or `previous()`.

Constructor Summary
public	ObjectArrayListIterator() Constructor for use with `setArray`.
public	ObjectArrayListIterator(Object[] array) Constructs an ObjectArrayListIterator that will iterate over the values in the specified array.
public	ObjectArrayListIterator(Object[] array, int start) Constructs an ObjectArrayListIterator that will iterate over the values in the specified array from a specific start index.
public	ObjectArrayListIterator(Object[] array, int start, int end) Construct an ObjectArrayListIterator that will iterate over a range of values in the specified array.

Method Summary
public void	add(Object obj) This iterator does not support modification of its backing array's size, and so will always throw an UnsupportedOperationException when this method is invoked.
public boolean	hasPrevious() Returns true if there are previous elements to return from the array.
public Object	next() Gets the next element from the array.
public int	nextIndex() Gets the next index to be retrieved.
public Object	previous() Gets the previous element from the array.
public int	previousIndex() Gets the index of the item to be retrieved if ObjectArrayListIterator.previous() is called.
public void	reset() Resets the iterator back to the start index.
public void	set(Object obj) Sets the element under the cursor. This method sets the element that was returned by the last call to ObjectArrayListIterator.next() of ObjectArrayListIterator.previous() .

Field Detail

lastItemIndex
protected int lastItemIndex(Code)
	Holds the index of the last item returned by a call to `next()` or `previous()`. This is set to `-1` if neither method has yet been invoked. `lastItemIndex` is used to to implement the ObjectArrayListIterator.set method.

Constructor Detail

ObjectArrayListIterator
public ObjectArrayListIterator()(Code)
	Constructor for use with `setArray`. Using this constructor, the iterator is equivalent to an empty iterator until ObjectArrayListIterator.setArray is called to establish the array to iterate over.

ObjectArrayListIterator
public ObjectArrayListIterator(Object[] array)(Code)
	Constructs an ObjectArrayListIterator that will iterate over the values in the specified array. Parameters: array - the array to iterate over throws: NullPointerException - if `array` is `null`

ObjectArrayListIterator
public ObjectArrayListIterator(Object[] array, int start)(Code)
	Constructs an ObjectArrayListIterator that will iterate over the values in the specified array from a specific start index. Parameters: array - the array to iterate over Parameters: start - the index to start iterating at throws: NullPointerException - if `array` is `null` throws: IndexOutOfBoundsException - if the start index is out of bounds

ObjectArrayListIterator
public ObjectArrayListIterator(Object[] array, int start, int end)(Code)
	Construct an ObjectArrayListIterator that will iterate over a range of values in the specified array. Parameters: array - the array to iterate over Parameters: start - the index to start iterating at Parameters: end - the index (exclusive) to finish iterating at throws: IndexOutOfBoundsException - if the start or end index is out of bounds throws: IllegalArgumentException - if end index is before the start throws: NullPointerException - if `array` is `null`

Method Detail

add
public void add(Object obj)(Code)
	This iterator does not support modification of its backing array's size, and so will always throw an UnsupportedOperationException when this method is invoked. Parameters: obj - the object to add throws: UnsupportedOperationException - always thrown.

hasPrevious
public boolean hasPrevious()(Code)
	Returns true if there are previous elements to return from the array. true if there is a previous element to return

next
public Object next()(Code)
	Gets the next element from the array. the next element throws: NoSuchElementException - if there is no next element

nextIndex
public int nextIndex()(Code)
	Gets the next index to be retrieved. the index of the item to be retrieved next

previous
public Object previous()(Code)
	Gets the previous element from the array. the previous element throws: NoSuchElementException - if there is no previous element

previousIndex
public int previousIndex()(Code)
	Gets the index of the item to be retrieved if ObjectArrayListIterator.previous() is called. the index of the item to be retrieved next

reset
public void reset()(Code)
	Resets the iterator back to the start index.

set
public void set(Object obj)(Code)
	Sets the element under the cursor. This method sets the element that was returned by the last call to ObjectArrayListIterator.next() of ObjectArrayListIterator.previous() . Note: ListIterator implementations that support `add()` and `remove()` only allow `set()` to be called once per call to `next()` or `previous` (see the ListIterator javadoc for more details). Since this implementation does not support `add()` or `remove()`, `set()` may be called as often as desired. Parameters: obj - the object to set into the array throws: IllegalStateException - if next() has not yet been called. throws: ClassCastException - if the object type is unsuitable for the array

Fields inherited from org.apache.commons.collections.iterators.ObjectArrayIterator

protected Object[] array(Code)(Java Doc)
protected int endIndex(Code)(Java Doc)
protected int index(Code)(Java Doc)
protected int startIndex(Code)(Java Doc)

Methods inherited from org.apache.commons.collections.iterators.ObjectArrayIterator

public Object[] getArray()(Code)(Java Doc)
public int getEndIndex()(Code)(Java Doc)
public int getStartIndex()(Code)(Java Doc)
public boolean hasNext()(Code)(Java Doc)
public Object next()(Code)(Java Doc)
public void remove()(Code)(Java Doc)
public void reset()(Code)(Java Doc)
public void setArray(Object[] array)(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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