Package qilin.util

Interface Numberer<E>

All Known Subinterfaces:

IterableNumberer<E>

All Known Implementing Classes:

ArrayNumberer, StringNumberer

public interface Numberer<E>

A numberer converts objects to unique non-negative integers, and vice-versa.

Author:

xiao, generalize the interface

Method Summary

Modifier and Type	Method	Description
void	add(E o)	Tells the numberer that a new object needs to be assigned a number.
E	get(long number)	Should return the object that was assigned the number.
long	get(E o)	Should return the number that was assigned to object o that was previously passed as an argument to add().
boolean	remove(E o)	Removes the number for a given object.
int	size()	Should return the number of objects that have been assigned numbers.

Method Details

add

void add(E o)

Tells the numberer that a new object needs to be assigned a number.

remove

boolean remove(E o)

Removes the number for a given object.

Parameters:

o - the element

Returns:

true if the removal was successful, false when not

get

long get(E o)

Should return the number that was assigned to object o that was previously passed as an argument to add().

get

E get(long number)

Should return the object that was assigned the number.

size

int size()

Should return the number of objects that have been assigned numbers.