1 /* 2 * Copyright (C) 2015 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.camera.captureintent.stateful; 18 19 import com.google.common.base.Optional; 20 21 import java.util.HashMap; 22 import java.util.Map; 23 24 import javax.annotation.ParametersAreNonnullByDefault; 25 26 /** 27 * Provides a basic implementation for {@link State} interface. 28 */ 29 @ParametersAreNonnullByDefault 30 public abstract class StateImpl implements State { 31 private final StateMachine mStateMachine; 32 private final Map<Class, EventHandler> mEventHandlerMap; 33 StateImpl(StateMachine stateMachine)34 protected StateImpl(StateMachine stateMachine) { 35 mStateMachine = stateMachine; 36 mEventHandlerMap = new HashMap<>(); 37 } 38 StateImpl(State previousState)39 protected StateImpl(State previousState) { 40 this(previousState.getStateMachine()); 41 } 42 43 @Override getStateMachine()44 public StateMachine getStateMachine() { 45 return mStateMachine; 46 } 47 48 @Override onEnter()49 public Optional<State> onEnter() { 50 return NO_CHANGE; 51 } 52 53 @Override onLeave()54 public void onLeave() { 55 } 56 57 @Override getEventHandlerCount()58 public int getEventHandlerCount() { 59 return mEventHandlerMap.size(); 60 } 61 62 @Override getEventHandler(Class<T> eventClass)63 public final <T extends Event> EventHandler<T> getEventHandler(Class<T> eventClass) { 64 return mEventHandlerMap.get(eventClass); 65 } 66 67 @Override setEventHandler( Class<T> eventClass, EventHandler<T> eventHandler)68 public final <T extends Event> void setEventHandler( 69 Class<T> eventClass, EventHandler<T> eventHandler) { 70 mEventHandlerMap.put(eventClass, eventHandler); 71 } 72 73 @Override removeEventHandler(Class<T> eventClass)74 public <T extends Event> void removeEventHandler(Class<T> eventClass) { 75 mEventHandlerMap.remove(eventClass); 76 } 77 }