1d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd/* 2d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Copyright (C) 2015 The Android Open Source Project 3d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * 4d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Licensed under the Apache License, Version 2.0 (the "License"); 5d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * you may not use this file except in compliance with the License. 6d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * You may obtain a copy of the License at 7d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * 8d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * http://www.apache.org/licenses/LICENSE-2.0 9d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * 10d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Unless required by applicable law or agreed to in writing, software 11d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * distributed under the License is distributed on an "AS IS" BASIS, 12d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * See the License for the specific language governing permissions and 14d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * limitations under the License. 15d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */ 16d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd 17d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddpackage com.android.messaging.datamodel.binding; 18d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd 19d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd/** 20d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Base class for data objects that will be bound to a piece of the UI 21d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */ 22d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddpublic abstract class BindableData { 23d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd /** 24d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Called by Binding during unbind to allow data to proactively unregister callbacks 25d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Data instance should release all listeners that may call back to the host UI 26d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */ 27d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd protected abstract void unregisterListeners(); 28d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd 29d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd /** 30d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Key used to identify the piece of UI that the data is currently bound to 31d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */ 32d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd private String mBindingId; 33d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd 34d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd /** 35d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Bind this data to the ui host - checks data is currently unbound 36d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */ 37d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd public void bind(final String bindingId) { 38d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd if (isBound() || bindingId == null) { 39d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd throw new IllegalStateException(); 40d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd } 41d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd mBindingId = bindingId; 42d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd } 43d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd 44d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd /** 45d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Unbind this data from the ui host - checks that the data is currently bound to specified id 46d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */ 47d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd public void unbind(final String bindingId) { 48d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd if (!isBound(bindingId)) { 49d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd throw new IllegalStateException(); 50d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd } 51d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd unregisterListeners(); 52d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd mBindingId = null; 53d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd } 54d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd 55d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd /** 56d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Check to see if the data is bound to anything 57d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * 58d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * TODO: This should be package private because it's supposed to only be used by Binding, 59d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * however, several classes call this directly. We want the classes to track what they are 60d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * bound to. 61d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */ 62d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd protected boolean isBound() { 63d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd return (mBindingId != null); 64d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd } 65d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd 66d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd /** 67d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Check to see if data is still bound with specified bindingId before calling over to ui 68d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */ 69d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd public boolean isBound(final String bindingId) { 70d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd return (bindingId.equals(mBindingId)); 71d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd } 72d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd} 73