1/*
2 * Copyright (C) 2014 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 com.android.ex.camera2.portability.util;
18
19import com.android.ex.camera2.portability.debug.Log;
20
21import java.lang.reflect.Method;
22
23/**
24 * Mirrors hidden class {@link android.os.SystemProperties} (available since API Level 1).
25 */
26public final class SystemProperties {
27    private static final Log.Tag TAG = new Log.Tag("SysProps");
28
29    /**
30     * Gets system properties set by <code>adb shell setprop <em>key</em> <em>value</em></code>
31     *
32     * @param key the property key.
33     * @param defaultValue the value to return if the property is undefined or empty (this parameter
34     *            may be {@code null}).
35     * @return the system property value or the default value.
36     */
37    public static String get(String key, String defaultValue) {
38        try {
39            final Class<?> systemProperties = Class.forName("android.os.SystemProperties");
40            final Method get = systemProperties.getMethod("get", String.class, String.class);
41            return (String) get.invoke(null, key, defaultValue);
42        } catch (Exception e) {
43            // This should never happen
44            Log.e(TAG, "Exception while getting system property: ", e);
45            return defaultValue;
46        }
47    }
48
49    private SystemProperties() {
50    }
51}
52