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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.ArrayIterator
      org.apache.commons.collections.iterators.ArrayListIterator

ArrayListIterator
public class ArrayListIterator extends ArrayIterator implements ListIterator,ResettableListIterator(Code)
Implements a ListIterator over an array.

The array can be either an array of object or of primitives. If you know that you have an object array, the ObjectArrayListIterator class is a better choice, as it will perform better.

This iterator does not support ArrayListIterator.add(Object) or ArrayListIterator.remove() , as the array cannot be changed in size. The ArrayListIterator.set(Object) method is supported however.
See Also:   org.apache.commons.collections.iterators.ArrayIterator
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  intlastItemIndex
     Holds the index of the last item returned by a call to next() or previous().

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

Method Summary
public  voidadd(Object o)
     This iterator does not support modification of its backing collection, and so will always throw an UnsupportedOperationException when this method is invoked.
public  booleanhasPrevious()
     Returns true if there are previous elements to return from the array.
public  Objectnext()
     Gets the next element from the array.
public  intnextIndex()
     Gets the next index to be retrieved.
public  Objectprevious()
     Gets the previous element from the array.
public  intpreviousIndex()
     Gets the index of the item to be retrieved if ArrayListIterator.previous() is called.
public  voidreset()
     Resets the iterator back to the start index.
public  voidset(Object o)
     Sets the element under the cursor.

This method sets the element that was returned by the last call to ArrayListIterator.next() of ArrayListIterator.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 ArrayListIterator.set method.




Constructor Detail
ArrayListIterator
public ArrayListIterator()(Code)
Constructor for use with setArray.

Using this constructor, the iterator is equivalent to an empty iterator until ArrayListIterator.setArray(Object) is called to establish the array to iterate over.




ArrayListIterator
public ArrayListIterator(Object array)(Code)
Constructs an ArrayListIterator that will iterate over the values in the specified array.
Parameters:
  array - the array to iterate over
throws:
  IllegalArgumentException - if array is not an array.
throws:
  NullPointerException - if array is null



ArrayListIterator
public ArrayListIterator(Object array, int startIndex)(Code)
Constructs an ArrayListIterator that will iterate over the values in the specified array from a specific start index.
Parameters:
  array - the array to iterate over
Parameters:
  startIndex - the index to start iterating at
throws:
  IllegalArgumentException - if array is not an array.
throws:
  NullPointerException - if array is null
throws:
  IndexOutOfBoundsException - if the start index is out of bounds



ArrayListIterator
public ArrayListIterator(Object array, int startIndex, int endIndex)(Code)
Construct an ArrayListIterator that will iterate over a range of values in the specified array.
Parameters:
  array - the array to iterate over
Parameters:
  startIndex - the index to start iterating at
Parameters:
  endIndex - the index (exclusive) to finish iterating at
throws:
  IllegalArgumentException - if array is not an array.
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 o)(Code)
This iterator does not support modification of its backing collection, and so will always throw an UnsupportedOperationException when this method is invoked.
throws:
  UnsupportedOperationException - always thrown.
See Also:   java.util.ListIterator.set



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 ArrayListIterator.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 o)(Code)
Sets the element under the cursor.

This method sets the element that was returned by the last call to ArrayListIterator.next() of ArrayListIterator.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.
See Also:   java.util.ListIterator.set




Fields inherited from org.apache.commons.collections.iterators.ArrayIterator
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.ArrayIterator
protected void checkBound(int bound, String type)(Code)(Java Doc)
public Object getArray()(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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