structure
Class HashtableIterator

java.lang.Object
  |
  +--structure.AbstractIterator
        |
        +--structure.HashtableIterator

All Implemented Interfaces:

Enumeration, Iterator

class HashtableIterator

extends AbstractIterator

A traversal of all the elements as they appear in a hashtable. No order is guaranteed. This iterator is not publically accessable and is used to implement Hashtable's key and value iterators. This iteration returns objects that are instances of Association.

Typical use:

      Hashtable h = new Hashtable();
      // ...hashtable gets built up...
      Iterator hi = new HashtableIterator(h.data);
      while (hi.hasNext())
      {
          System.out.println(ai.next());
      }
 

Field Summary

protected int	current The current entry being considered.
protected Association[]	data Reference to hash table data

Constructor Summary

HashtableIterator(Association[] table)
Construct a traversal over a hashtable.

Method Summary

Object	get() Get current value of traversal.
boolean	hasNext() Returns true iff there are unconsidered elements within the table.
Object	next() Returns current value and increments traversal.
void	reset() Resets the traversal to point to the beginning of the table.

Methods inherited from class structure.AbstractIterator

hasMoreElements, nextElement, remove, value

Methods inherited from class java.lang.Object

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

Field Detail

current

protected int current

The current entry being considered.

data

protected Association[] data

Reference to hash table data

Constructor Detail

HashtableIterator

public HashtableIterator(Association[] table)

Construct a traversal over a hashtable.

Parameters:

table - The array of lists to be traversed.

Method Detail

reset

public void reset()

Resets the traversal to point to the beginning of the table.

Overrides:

reset in class AbstractIterator

Postcondition:

resets traversal to beginning of hash table

hasNext

public boolean hasNext()

Returns true iff there are unconsidered elements within the table.

Overrides:

hasNext in class AbstractIterator

Postcondition:

returns true if there are unvisited elements

Returns:

True iff there are elements yet to be considered within table.

next

public Object next()

Returns current value and increments traversal.

Overrides:

next in class AbstractIterator

Precondition:

hasNext()

Postcondition:

returns current element, increments traversal

Returns:

The current value, before incrementing.

get

public Object get()

Get current value of traversal.

Overrides:

get in class AbstractIterator

Postcondition:

returns current element

Returns:

The current value.