jaitools.jiffle.runtime
Class IntegerStack

java.lang.Object
  jaitools.jiffle.runtime.IntegerStack

public class IntegerStack
extends Object

A simple, array-based stack for Integer values used by AbstractJiffleRuntime. This class is here to avoid using generic collections (which the Janino compiler does not support) or littering the runtime source code with casts.

Since:

1.1

Version:

$Id: IntegerStack.java 1451 2011-02-24 05:25:37Z michael.bedward $

Author:

Michael Bedward

Field Summary

static int	CHUNK_SIZE Initial size of stack and grow increment
static int	CLEAR_SIZE Stack size beyond which the data array will be shrunk when clear() is called.

Constructor Summary

IntegerStack()

Method Summary

void	clear() Clear the stack.
Integer	peek() Peek at the top value without removing it.
Integer	pop() Pop the top value off the stack.
Integer	push(Integer x) Push a value onto the stack.
int	size() Gets the number of items on the stack.

Methods inherited from class java.lang.Object

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

Field Detail

CHUNK_SIZE

public static final int CHUNK_SIZE

Initial size of stack and grow increment

See Also:

Constant Field Values

CLEAR_SIZE

public static final int CLEAR_SIZE

Stack size beyond which the data array will be shrunk when clear() is called.

See Also:

Constant Field Values

Constructor Detail

IntegerStack

public IntegerStack()

Method Detail

push

public Integer push(Integer x)

Push a value onto the stack.

Parameters:

x - the value

Returns:

the value

pop

public Integer pop()

Pop the top value off the stack.

Returns:

the value

Throws:

RuntimeException - if the stack is empty

peek

public Integer peek()

Peek at the top value without removing it.

Returns:

the value

Throws:

RuntimeException - if the stack is empty

clear

public void clear()

Clear the stack. If the stack size if above CLEAR_SIZE the data array is shrunk to its initial size.

size

public int size()

Gets the number of items on the stack.

Returns:

number of items.