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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;

/**
 * Abstract UUID generator
 * UUID生成器抽象类
 *
 * @author Steven Wee	[email protected]
 * @version $Revision: 1.0.0 $ $Date: Jul 06, 2022 12:48:16 $
 */
public abstract class UUIDGenerator implements IGenerator {
    /**
	 * Calculate high bits of given data bytes
	 * 从给定的二进制数组计算高位值
     *
     * @param randomBytes   given data bytes
     *                      给定的二进制数组
     * @return  High bits value in long
     *          long型的高位比特值
     */
    protected final long highBits(byte[] randomBytes) {
        long highBits = 0L;
        for (int i = 0 ; i < 8 ; i++) {
            highBits = (highBits << 8) | (randomBytes[i] & 0xFF);
        }
        return highBits;
    }
    /**
	 * Calculate high bits of given current time milliseconds
	 * 从给定的当前时间戳计算高位值
     *
     * @param currentTimeMillis     current time milliseconds
     *                              当前时间戳
     * @return  High bits value in long
     *          long型的高位比特值
     */
    protected final long highBits(long currentTimeMillis) {
        return ((currentTimeMillis & 0xFFFFFFFFL) << 32)
                | ((currentTimeMillis & 0xFFFF00000000L) >> 16)
                | 0x1000L
                | ((currentTimeMillis & 0xFFF000000000000L) >> 48);
    }
    /**
	 * Calculate low bits of given data bytes
	 * 从给定的二进制数组计算低位值
     *
     * @param dataBytes     given data bytes
     *                      给定的二进制数组
     * @return  Low bits value in long
     *          long型的低位比特值
     */
    protected long lowBits(byte[] dataBytes) {
        long lowBits = 0L;
        for (int index = 8 ; index < 16 ; index++) {
            lowBits = (lowBits << 8) | (dataBytes[index] & 0xFF);
        }
        return lowBits;
    }
    /**
	 * Destroy current generator instance
	 * 销毁当前生成器实例对象
     */
    @Override
    public void destroy() {
    }
}