io.vertx.redis.client.impl.ArrayStack Maven / Gradle / Ivy
/*
* Copyright 2019 Red Hat, Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* The Apache License v2.0 is available at
* http://www.opensource.org/licenses/apache2.0.php
*
* You may elect to redistribute this code under either of these licenses.
*/
package io.vertx.redis.client.impl;
final class ArrayStack {
private final Object[] stack;
private int pointer;
ArrayStack(int size) {
stack = new Object[size];
pointer = -1;
}
void push(T item) {
stack[++pointer] = item;
}
T pop() {
final Object o = stack[pointer];
stack[pointer--] = null;
return (T) o;
}
boolean empty() {
return pointer == -1;
}
T peek() {
if (pointer == -1) {
return null;
}
return (T) stack[pointer];
}
int size() {
return pointer + 1;
}
}