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.settings.overlay; 18 19 import android.content.Context; 20 import android.text.TextUtils; 21 import android.util.Log; 22 23 import com.android.settings.R; 24 25 /** 26 * Abstract class for creating feature controllers. Allows OEM implementations to define their own 27 * factories with their own controllers containing whatever code is needed to implement 28 * the features. To provide a factory implementation, implementors should override 29 * {@link R.string#config_featureFactory} in their override. 30 */ 31 public abstract class FeatureFactory { 32 private static final String LOG_TAG = "FeatureFactory"; 33 private static final boolean DEBUG = false; 34 35 private static FeatureFactory sFactory; 36 37 /** 38 * Returns a factory for creating feature controllers. Creates the factory if it does not 39 * already exist. Uses the value of {@link R.string#config_featureFactory} to instantiate 40 * a factory implementation. 41 */ getFactory(Context context)42 public static FeatureFactory getFactory(Context context) { 43 if (sFactory != null) { 44 return sFactory; 45 } 46 47 if (DEBUG) Log.d(LOG_TAG, "getFactory"); 48 final String clsName = context.getString(R.string.config_featureFactory); 49 if (TextUtils.isEmpty(clsName)) { 50 throw new UnsupportedOperationException("No feature factory configured"); 51 } 52 try { 53 sFactory = (FeatureFactory) context.getClassLoader().loadClass(clsName).newInstance(); 54 } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) { 55 throw new FactoryNotFoundException(e); 56 } 57 58 if (DEBUG) Log.d(LOG_TAG, "started " + sFactory.getClass().getSimpleName()); 59 return sFactory; 60 } 61 getSupportFeatureProvider(Context context)62 public abstract SupportFeatureProvider getSupportFeatureProvider(Context context); 63 64 public static final class FactoryNotFoundException extends RuntimeException { FactoryNotFoundException(Throwable throwable)65 public FactoryNotFoundException(Throwable throwable) { 66 super("Unable to create factory. Did you misconfigure Proguard?", throwable); 67 } 68 } 69 } 70