org.apache.calcite.util

Class Stacks

java.lang.Object

org.apache.calcite.util.Stacks

public class Stacks
extends Object

Utilities to make vanilla lists look like stacks.

Method Summary

Methods

Modifier and Type	Method and Description
static <T> T	peek(List<T> stack) Returns the most recently added element in the stack.
static <T> void	pop(List<T> stack, T element) Removes an element from the stack.
static <T> void	push(List<T> stack, T element) Adds an element to the stack.

Methods inherited from class java.lang.Object

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

Method Detail

peek

public static <T> T peek(List<T> stack)

Returns the most recently added element in the stack. Throws if the stack is empty.

push

public static <T> void push(List<T> stack,
            T element)

Adds an element to the stack.

pop

public static <T> void pop(List<T> stack,
           T element)

Removes an element from the stack. Asserts of the element is not the one last added; throws if the stack is empty.