| // Copyright 2017 The Cobalt Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package dev.cobalt.util; |
| |
| import android.support.annotation.Nullable; |
| |
| /** Holds a mutable reference to an object, or null. */ |
| public class Holder<T> { |
| private T instance; |
| |
| public Holder() { |
| this.instance = null; |
| } |
| |
| public void set(@Nullable T instance) { |
| this.instance = instance; |
| } |
| |
| @Nullable |
| public T get() { |
| return instance; |
| } |
| } |
