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Wudaosoft Commons Library
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/**
 *    Copyright 2009-2018 Wudao Software Studio(wudaosoft.com)
 * 
 *    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.wudaosoft.commons.utils;

import java.net.InetAddress;

/**
 * ID生成器 
 * @author Changsoul.Wu
 * @date 2012-8-11 下午3:33:38
 */
public class IdGenerator {
	private static final int IP;
	static {
		int ipadd;
		try {
			ipadd = toInt(InetAddress.getLocalHost().getAddress());
		} catch (Exception e) {

			ipadd = 0;
		}
		IP = ipadd;
	}
	private static short counter = (short) 0;
	private static final int JVM = (int) (System.currentTimeMillis() >>> 8);
	private static String sep = "";

	public static String getSeparator() {
		return sep;
	}

	public void setSeparator(String separator) {
		sep = (separator == null ? "" : separator);
	}

	public static String generate() {
		return new StringBuffer(36).append(format(getIP())).append(sep)
				.append(format(getJVM())).append(sep)
				.append(format(getHiTime())).append(sep)
				.append(format(getLoTime())).append(sep)
				.append(format(getCount())).toString().toUpperCase();
	}

	protected static int getJVM() {
		return JVM;
	}

	protected static short getCount() {
		synchronized (IdGenerator.class) {
			if (counter < 0)
				counter = 0;
			return counter++;
		}
	}

	protected static int getIP() {
		return IP;
	}

	protected static short getHiTime() {
		return (short) (System.currentTimeMillis() >>> 32);
	}

	protected static int getLoTime() {
		return (int) System.currentTimeMillis();
	}

	private static int toInt(byte[] bytes) {
		int result = 0;
		for (int i = 0; i < 4; i++) {
			result = (result << 8) - Byte.MIN_VALUE + (int) bytes[i];
		}
		return result;
	}

	protected static String format(int intval) {
		String formatted = Integer.toHexString(intval);
		StringBuffer buf = new StringBuffer("00000000");
		buf.replace(8 - formatted.length(), 8, formatted);
		return buf.toString();
	}

	protected static String format(short shortval) {
		String formatted = Integer.toHexString(shortval);
		StringBuffer buf = new StringBuffer("0000");
		buf.replace(4 - formatted.length(), 4, formatted);
		return buf.toString();
	}
	
}