1 /* 2 * Copyright (C) 2018 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.car.settings.common; 18 19 import androidx.preference.Preference; 20 21 /** Contains utility function to operate on Preferences. */ 22 public class PreferenceUtil { 23 24 /** Ensures that the preference of given type. */ checkPreferenceType(Preference preference, Class expectedType)25 public static boolean checkPreferenceType(Preference preference, Class expectedType) { 26 return expectedType.isInstance(preference); 27 } 28 29 /** 30 * Requires that the preference is of given type. 31 * 32 * @throws IllegalArgumentException if the preference is not of the given type. 33 */ requirePreferenceType(Preference preference, Class expectedType)34 public static void requirePreferenceType(Preference preference, Class expectedType) { 35 if (!checkPreferenceType(preference, expectedType)) { 36 throw new IllegalArgumentException( 37 "Preference should be of type " + expectedType.getName()); 38 } 39 } 40 } 41