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