g2d.util

Class TetrisStack

java.lang.Object

g2d.util.TetrisStack

public class TetrisStack
extends java.lang.Object

This beast is a peculiar stack of limited size. It allows the usual push() and pop() operations. However, if the stack is full, a subsequent push results in the lowest (oldest) element to be dropped (like a ring buffer). The other weird thing is that some values are registered as puffable: If a new value is pushed on top of a puffable value, this previous entry will be removed (kind of like 1-column tetris with a correctly colored block).

Used to keep track of last tab panes seen that are enabled.

Constructor Summary

Constructors

Constructor and Description
TetrisStack(int capacity)

Method Summary

Modifier and Type	Method and Description
void	addPuffable(int puff) Add a puffable value.
boolean	isEmpty() Test whether stack is empty.
int	pop() Get last element in stack.
void	push(int value) Push new element on stack.

Methods inherited from class java.lang.Object

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

Constructor Detail

TetrisStack

public TetrisStack(int capacity)

Method Detail

addPuffable

public void addPuffable(int puff)

Add a puffable value.

Parameters:

puff - Integer value that is puffed or overwritten if new value pushed upon

push

public void push(int value)

Push new element on stack. If stack reached its capacity, it will remove the oldest element first. Then, if new element pushed on puffable, will also remove the puffable value.

Parameters:

value - Integer value of new element

pop

public int pop()

Get last element in stack.

Returns:

last element in stack

Throws:

java.lang.IndexOutOfBoundsException - if stack is empty

isEmpty

public boolean isEmpty()

Test whether stack is empty.

Returns:

True is stack is empty, false otherwise