| // Copyright (c) 2019, the R8 project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| package com.android.tools.r8.utils; |
| |
| import java.util.Comparator; |
| import java.util.Objects; |
| import java.util.function.Supplier; |
| |
| public class Box<T> { |
| |
| private T value; |
| |
| public Box() {} |
| |
| public Box(T initialValue) { |
| set(initialValue); |
| } |
| |
| public T computeIfAbsent(Supplier<T> supplier) { |
| if (value == null) { |
| value = supplier.get(); |
| } |
| return value; |
| } |
| |
| public T get() { |
| return value; |
| } |
| |
| public void set(T value) { |
| this.value = value; |
| } |
| |
| public void setMin(T element, Comparator<T> comparator) { |
| if (!isSet() || comparator.compare(element, get()) < 0) { |
| set(element); |
| } |
| } |
| |
| public boolean isSet() { |
| return value != null; |
| } |
| |
| public T getAndSet(T newValue) { |
| T oldValue = value; |
| value = newValue; |
| return oldValue; |
| } |
| |
| @Override |
| public boolean equals(Object object) { |
| if (object == null || getClass() != object.getClass()) { |
| return false; |
| } |
| Box<?> box = (Box<?>) object; |
| return Objects.equals(value, box.value); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(value); |
| } |
| } |