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.tests;
18
19import android.content.Context;
20import android.os.ParcelFileDescriptor;
21
22import java.io.File;
23import java.io.FileOutputStream;
24import java.io.IOException;
25import java.io.InputStream;
26
27/**
28 * Utilities for tests.
29 */
30final class TestUtils {
31    /**
32     * Saves a file from resources to a temporary location and returns a File instance for it.
33     *
34     * @param id Resource ID
35     */
36    static File createFileFromResource(Context context, int id) throws IOException {
37        final File file = File.createTempFile("android.support.provider.tests{",
38                "}.zip", context.getCacheDir());
39        try (
40            final FileOutputStream outputStream =
41                    new ParcelFileDescriptor.AutoCloseOutputStream(
42                            ParcelFileDescriptor.open(
43                                    file, ParcelFileDescriptor.MODE_WRITE_ONLY));
44            final InputStream inputStream = context.getResources().openRawResource(id);
45        ) {
46            final byte[] buffer = new byte[32 * 1024];
47            int bytes;
48            while ((bytes = inputStream.read(buffer)) != -1) {
49                outputStream.write(buffer, 0, bytes);
50            }
51            outputStream.flush();
52            return file;
53        }
54    }
55}
56