uk.gov.gchq.gaffer.commonutil.LongUtil Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2017-2019 Crown Copyright
 *
 * 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 uk.gov.gchq.gaffer.commonutil;

import java.util.SplittableRandom;

/**
 * Utility methods for Longs.
 */
public final class LongUtil {
    private static final SplittableRandom RANDOM = new SplittableRandom();

    private LongUtil() {
        // Private constructor to prevent instantiation.
    }

    /**
     * Gets a random positive long value based on the current time and a random number.
     *
     * @return the time based random number
     */
    public static long getTimeBasedRandom() {
        final long random = (System.currentTimeMillis() << 32) | RANDOM.nextInt(Integer.MAX_VALUE);
        return Long.MIN_VALUE == random ? Long.MAX_VALUE : Math.abs(random);
    }
}