1 /* 2 * Copyright (C) 2016 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.documentsui.base; 18 19 /** 20 * A functional interface that handles an event and returns a boolean to indicate if the event 21 * is consumed. 22 */ 23 @FunctionalInterface 24 public interface EventHandler<T> { accept(T event)25 boolean accept(T event); 26 createStub(boolean reply)27 public static <T> EventHandler<T> createStub(boolean reply) { 28 return new Stub<T>(reply); 29 } 30 31 public static final class Stub<T> implements EventHandler<T> { 32 33 private boolean mReply; 34 Stub(boolean reply)35 private Stub(boolean reply) { 36 mReply = reply;} 37 38 @Override accept(T event)39 public boolean accept(T event) { 40 return mReply; 41 } 42 43 } 44 }