org.cdlib.xtf.util

Class ConsecutiveMap

Object

ConsecutiveMap

public class ConsecutiveMap
extends Object

Implements a simple mapping, from object keys to integers. Each new key is assigned a consecutive number, starting at zero.

Author:

Martin Haye

Field Summary

Fields

Modifier and Type	Field and Description
private Vector	inOrder Vector of all unique keys, in order of addition
private HashMap	map Mapping used to keep the unique set of keys

Constructor Summary

Constructors

Constructor and Description
ConsecutiveMap()

Method Summary

Modifier and Type	Method and Description
int	get(Object key) Retrieve the namecode for the given key.
Object[]	getArray() Retrieve an array of all the keys, ordered by consecutive number.
boolean	has(Object key) Check if the given key is present in the map yet.
int	put(Object key) If the key is already present in the map, return its assigned number.

Methods inherited from class Object

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

Field Detail

map

private HashMap map

Mapping used to keep the unique set of keys

inOrder

private Vector inOrder

Vector of all unique keys, in order of addition

Constructor Detail

ConsecutiveMap

public ConsecutiveMap()

Method Detail

put

public int put(Object key)

If the key is already present in the map, return its assigned number. Otherwise, add it and assign it a new number.

Parameters:

key - The key to look up

Returns:

A number associated with that key

get

public int get(Object key)

Retrieve the namecode for the given key. If not found, returns -1.

has

public boolean has(Object key)

Check if the given key is present in the map yet.

getArray

public Object[] getArray()

Retrieve an array of all the keys, ordered by consecutive number.