org.eclipse.nebula.visualization.internal.xygraph.undo

Class SizeLimitedStack<T>

java.lang.Object

org.eclipse.nebula.visualization.internal.xygraph.undo.SizeLimitedStack<T>

public class SizeLimitedStack<T>
extends java.lang.Object

A stack with limited size. If the stack is full, the oldest element will be removed when new element was pushed.

Constructor Summary

Constructors

Constructor and Description
SizeLimitedStack(int sizeLimit) Constructor

Method Summary

Modifier and Type	Method and Description
void	clear() Empty the stack.
T	peek() Looks at the object at the top of this stack without removing it from the stack.
T	pop() Removes the object at the top of this stack and returns that object as the value of this function.
void	push(T e) Pushes an item onto the top of this stack.
int	size() Returns the number of elements in this stack.
java.lang.Object[]	toArray() Return an array of all elements in the stack.

Methods inherited from class java.lang.Object

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

Constructor Detail

SizeLimitedStack

public SizeLimitedStack(int sizeLimit)

Constructor

Parameters:

sizeLimit - the maximum number of elements in the stack. If the stack is full, the oldest element will be removed when new element was pushed.

Method Detail

push

public void push(T e)

Pushes an item onto the top of this stack.

Parameters:

e - the item to be pushed onto this stack.

pop

public T pop()

Removes the object at the top of this stack and returns that object as the value of this function.

Returns:

The object at the top of this stack (the last item of the Vector object).

Throws:

java.util.NoSuchElementException - if this list is empty

peek

public T peek()

Looks at the object at the top of this stack without removing it from the stack.

Returns:

the object at the top of this stack (the last item of the Vector object).

Throws:

java.util.NoSuchElementException - if this list is empty

clear

public void clear()

Empty the stack.

toArray

public java.lang.Object[] toArray()

Return an array of all elements in the stack. The oldest element is the first element of the returned array.

Returns:

the array contained all elements in the stack.

size

public int size()

Returns the number of elements in this stack.

Returns:

the number of elements in this stack