// 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;
  }
}