/*
 * Copyright (C) 2021 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.os;

import android.os.SystemClock;

/**
 * A wrapper for SystemClock, intended for mocking in unit tests.
 */
@android.ravenwood.annotation.RavenwoodKeepWholeClass
public abstract class Clock {
    /** Elapsed Realtime, see SystemClock.elapsedRealtime() */
    public long elapsedRealtime() {
        throw new UnsupportedOperationException();
    }

    /** Uptime, see SystemClock.uptimeMillis() */
    public long uptimeMillis() {
        throw new UnsupportedOperationException();
    }

    /** Wall-clock time as per System.currentTimeMillis() */
    public long currentTimeMillis() {
        throw new UnsupportedOperationException();
    }

    public static final Clock SYSTEM_CLOCK = new Clock() {

        @Override
        public long elapsedRealtime() {
            return SystemClock.elapsedRealtime();
        }

        @Override
        public long uptimeMillis() {
            return SystemClock.uptimeMillis();
        }

        @Override
        public long currentTimeMillis() {
            return System.currentTimeMillis();
        }
    };
}