1 /* 2 * Copyright (C) 2013 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.contacts.common.extensions; 18 19 import android.content.Context; 20 import android.util.Log; 21 22 import java.io.FileNotFoundException; 23 import java.io.IOException; 24 import java.io.InputStream; 25 import java.util.Properties; 26 27 28 /* 29 * A framework for adding extensions to Dialer. This class reads a property file from 30 * assets/contacts_extensions.properties and loads extension classes that an app has defined. If 31 * an extension class was not defined, null is returned. 32 */ 33 public class ExtensionsFactory { 34 35 private static String TAG = "ExtensionsFactory"; 36 37 // Config filename for mappings of various class names to their custom 38 // implementations. 39 private static final String EXTENSIONS_PROPERTIES = "contacts_extensions.properties"; 40 41 private static final String EXTENDED_PHONE_DIRECTORIES_KEY = "extendedPhoneDirectories"; 42 43 private static Properties sProperties = null; 44 private static ExtendedPhoneDirectoriesManager mExtendedPhoneDirectoriesManager = null; 45 46 public static void init(Context context) { 47 if (sProperties != null) { 48 return; 49 } 50 try { 51 final InputStream fileStream = context.getAssets().open(EXTENSIONS_PROPERTIES); 52 sProperties = new Properties(); 53 sProperties.load(fileStream); 54 fileStream.close(); 55 56 final String className = sProperties.getProperty(EXTENDED_PHONE_DIRECTORIES_KEY); 57 if (className != null) { 58 mExtendedPhoneDirectoriesManager = createInstance(className); 59 } else { 60 Log.d(TAG, EXTENDED_PHONE_DIRECTORIES_KEY + " not found in properties file."); 61 } 62 63 } catch (FileNotFoundException e) { 64 // No custom extensions. Ignore. 65 Log.d(TAG, "No custom extensions."); 66 } catch (IOException e) { 67 Log.d(TAG, e.toString()); 68 } 69 } 70 71 private static <T> T createInstance(String className) { 72 try { 73 Class<?> c = Class.forName(className); 74 //noinspection unchecked 75 return (T) c.newInstance(); 76 } catch (ClassNotFoundException e) { 77 Log.e(TAG, className + ": unable to create instance.", e); 78 } catch (IllegalAccessException e) { 79 Log.e(TAG, className + ": unable to create instance.", e); 80 } catch (InstantiationException e) { 81 Log.e(TAG, className + ": unable to create instance.", e); 82 } 83 return null; 84 } 85 86 public static ExtendedPhoneDirectoriesManager getExtendedPhoneDirectoriesManager() { 87 return mExtendedPhoneDirectoriesManager; 88 } 89 } 90
