1/* 2 * Copyright (C) 2015 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 17package android.support.provider; 18 19import android.support.annotation.Nullable; 20import android.support.annotation.RestrictTo; 21import android.text.TextUtils; 22 23import java.util.Collection; 24 25import static android.support.annotation.RestrictTo.Scope.GROUP_ID; 26 27/** 28 * Simple static methods to be called at the start of your own methods to verify 29 * correct arguments and state. 30 * @hide 31 */ 32@RestrictTo(GROUP_ID) 33final class Preconditions { 34 static void checkArgument(boolean expression, String message) { 35 if (!expression) { 36 throw new IllegalArgumentException(message); 37 } 38 } 39 40 static void checkArgumentNotNull(Object object, String message) { 41 if (object == null) { 42 throw new IllegalArgumentException(message); 43 } 44 } 45 46 static void checkArgumentEquals(String expected, @Nullable String actual, String message) { 47 if (!TextUtils.equals(expected, actual)) { 48 throw new IllegalArgumentException(String.format(message, String.valueOf(expected), 49 String.valueOf(actual))); 50 } 51 } 52 53 static void checkState(boolean expression, String message) { 54 if (!expression) { 55 throw new IllegalStateException(message); 56 } 57 } 58} 59