1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.systemui.keyguard; 18 19 import java.util.ArrayList; 20 import java.util.function.Consumer; 21 22 /** 23 * Base class for lifecycles with observers. 24 */ 25 public class Lifecycle<T> { 26 27 private ArrayList<T> mObservers = new ArrayList<>(); 28 addObserver(T observer)29 public void addObserver(T observer) { 30 mObservers.add(observer); 31 } 32 removeObserver(T observer)33 public void removeObserver(T observer) { 34 mObservers.remove(observer); 35 } 36 dispatch(Consumer<T> consumer)37 public void dispatch(Consumer<T> consumer) { 38 for (int i = 0; i < mObservers.size(); i++) { 39 consumer.accept(mObservers.get(i)); 40 } 41 } 42 } 43