Class JavaMap

java.lang.Object
  |
  +--JavaMap

All Implemented Interfaces:

IMap

public class JavaMap

extends Object

implements IMap

IMap implementation using a Java Hashtable to store items.

Field Summary

protected Hashtable

items Hashtable used to store items in this.

Fields inherited from interface IMap

NO_SUCH_ELEMENT

Constructor Summary

JavaMap()
Constructs an empty Java map.

Method Summary

void	insertItem(Object aKey, Object anElement) Inserts an item into this that associates the given key with the given element, increasing the size of this by 1 if the given key is not already in this.
boolean	isEmpty() Returns whether or not this is empty.
Object	lookupElement(Object aKey) Returns the element associated with the given key, or NO_SUCH_ELEMENT if the key is not in this.
Object	removeElement(Object aKey) Removes and returns the element in this that is associated with the given key, reducing the size of this by 1, or returns NO_SUCH_ELEMENT and does not change the size if the key is not in this.
int	size() Returns the number of items in this.

Methods inherited from class java.lang.Object

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

Field Detail

items

protected Hashtable items

Hashtable used to store items in this.

Constructor Detail

JavaMap

public JavaMap()

Constructs an empty Java map.

Method Detail

insertItem

public void insertItem(Object aKey,
                       Object anElement)

Inserts an item into this that associates the given key with the given element, increasing the size of this by 1 if the given key is not already in this.

Specified by:

insertItem in interface IMap

Parameters:

aKey - key for the element

anElement - element to be inserted

lookupElement

public Object lookupElement(Object aKey)

Returns the element associated with the given key, or NO_SUCH_ELEMENT if the key is not in this.

Specified by:

lookupElement in interface IMap

Parameters:

aKey - key for element to retrieve

removeElement

public Object removeElement(Object aKey)

Removes and returns the element in this that is associated with the given key, reducing the size of this by 1, or returns NO_SUCH_ELEMENT and does not change the size if the key is not in this.

Specified by:

removeElement in interface IMap

Parameters:

aKey - key for element to remove

size

public int size()

Returns the number of items in this.

Specified by:

size in interface IMap

isEmpty

public boolean isEmpty()

Returns whether or not this is empty.

Specified by:

isEmpty in interface IMap