org.nervousync.generator.uuid.UUIDGenerator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of utils-jdk11 Show documentation

Java utility collections, development by Nervousync Studio (NSYC)

There is a newer version: 1.2.1

/*
 * Licensed to the Nervousync Studio (NSYC) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.nervousync.generator.uuid;

import org.nervousync.generator.IGenerator;

/**
 * The type Uuid generator.
 */
public abstract class UUIDGenerator implements IGenerator {

    /**
     * High bits long.
     *
     * @param randomBytes the random bytes
     * @return the long
     */
    protected final long highBits(byte[] randomBytes) {
        long highBits = 0L;
        for (int i = 0 ; i < 8 ; i++) {
            highBits = (highBits << 8) | (randomBytes[i] & 0xFF);
        }
        return highBits;
    }

    /**
     * High bits long.
     *
     * @param currentTimeMillis the current time millis
     * @return the long
     */
    protected final long highBits(long currentTimeMillis) {
        return ((currentTimeMillis & 0xFFFFFFFFL) << 32)
                | ((currentTimeMillis & 0xFFFF00000000L) >> 16)
                | 0x1000L
                | ((currentTimeMillis & 0xFFF000000000000L) >> 48);
    }

    /**
     * Low bits long.
     *
     * @param dataBytes the data bytes
     * @return the long
     */
    protected long lowBits(byte[] dataBytes) {
        long lowBits = 0L;
        for (int index = 8 ; index < 16 ; index++) {
            lowBits = (lowBits << 8) | (dataBytes[index] & 0xFF);
        }
        return lowBits;
    }

    @Override
    public void destroy() {
    }
}