water.cascade

Class Env.ExecStack

java.lang.Object

water.cascade.Env.ExecStack

Enclosing class:

Env

public class Env.ExecStack
extends java.lang.Object

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isEmpty() Is the stack empty?
java.lang.Object	peek() Peek the top of the stack
java.lang.Object	peekAt(int i) Peek the stack at position passed in (does error checking on the position)
int	peekType() Peek the type of the object at the top of the stack.
int	peekTypeAt(int i) Peek the tpe of the object at position `i` in the stack.
java.lang.Object	pop() Pop one of the top of the stack.
void	push(java.lang.Object t) Push an Object onto the stack
int	size() Get the size of the stack.

Methods inherited from class java.lang.Object

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

Method Detail

peek

public java.lang.Object peek()

Peek the top of the stack

Returns:

the Object at the `_head` of the stack

peekAt

public java.lang.Object peekAt(int i)

Peek the stack at position passed in (does error checking on the position)

Parameters:

i - The position at which to peek the stack

Returns:

the Object at position `i`.

peekType

public int peekType()

Peek the type of the object at the top of the stack. Does not pop!

Returns:

an int representing the type of the object at the top of the stack

peekTypeAt

public int peekTypeAt(int i)

Peek the tpe of the object at position `i` in the stack. Does not pop!

Parameters:

i - The position at which to peek the stack

Returns:

an int representing the type of the object at position `i` in the stack.

isEmpty

public boolean isEmpty()

Is the stack empty?

Returns:

true if empty, false otherwise

size

public int size()

Get the size of the stack.

Returns:

the number of Objects sitting in the stack. Assert that the number of Objects is aligned with `_head`.

pop

public java.lang.Object pop()

Pop one of the top of the stack.

Returns:

the Object sitting at the top of the stack

push

public void push(java.lang.Object t)

Push an Object onto the stack

Parameters:

t - is the Object to be pushed onto the stack.