| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * 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 com.android.systemui.keyguard; |
| |
| import androidx.annotation.NonNull; |
| |
| import java.util.ArrayList; |
| import java.util.Objects; |
| import java.util.function.BiConsumer; |
| import java.util.function.Consumer; |
| |
| /** |
| * Base class for lifecycles with observers. |
| */ |
| public class Lifecycle<T> { |
| |
| private ArrayList<T> mObservers = new ArrayList<>(); |
| |
| public void addObserver(@NonNull T observer) { |
| mObservers.add(Objects.requireNonNull(observer)); |
| } |
| |
| public void removeObserver(T observer) { |
| mObservers.remove(observer); |
| } |
| |
| public void dispatch(Consumer<T> consumer) { |
| for (int i = 0; i < mObservers.size(); i++) { |
| consumer.accept(mObservers.get(i)); |
| } |
| } |
| |
| /** |
| * Will dispatch the consumer to the observer, along with a single argument of type<U>. |
| */ |
| public <U> void dispatch(BiConsumer<T, U> biConsumer, U arg) { |
| for (int i = 0; i < mObservers.size(); i++) { |
| biConsumer.accept(mObservers.get(i), arg); |
| } |
| } |
| } |