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UserPresenter.java
/* * 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.example.android.persistence.migrations; import android.support.annotation.Nullable; /** * Listens for users's actions from the UI {@link UserActivity}, retrieves the data and updates * the UI as required. */ public class UserPresenter { private UserRepository mDataSource; @Nullable private UserView mView; private LoadUserCallback mLoadUserCallback; private UpdateUserCallback mUpdateUserCallback; public UserPresenter(UserRepository dataSource, UserView view) { mDataSource = dataSource; mView = view; mLoadUserCallback = createLoadUserCallback(); mUpdateUserCallback = createUpdateUserCallback(); } /** * Start working with the view. */ public void start() { mDataSource.getUser(mLoadUserCallback); } public void stop() { mView = null; } /** * Update the username of the user. * * @param userName the new userName */ public void updateUserName(final String userName) { mDataSource.updateUserName(userName, mUpdateUserCallback); } private LoadUserCallback createLoadUserCallback() { return new LoadUserCallback() { @Override public void onUserLoaded(User user) { if (mView != null) { mView.showUserName(user.getUserName()); } } @Override public void onDataNotAvailable() { if (mView != null) { mView.hideUserName(); } } }; } private UpdateUserCallback createUpdateUserCallback() { return user -> { if (mView != null) { mView.showUserName(user.getUserName()); } }; } }