jp.co.ntts.vhut.util.MacConversionUtil.java Source code

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Here is the source code for jp.co.ntts.vhut.util.MacConversionUtil.java

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/*
 * Copyright 2011 NTT Software Corporation.
 * All Rights Reserved.
 */
package jp.co.ntts.vhut.util;

import java.math.BigInteger;

import org.apache.commons.lang.StringUtils;

/**
 * <p>MAC?.
 *
 * @version 1.0.0
 * @author NTT Software Corporation.
 *
 * <!--
 * $Date: 2011-11-28 19:50:40 +0900 (, 28 11 2011) $
 * $Revision: 949 $
 * $Author: NTT Software Corporation. $
 * -->
 */
public class MacConversionUtil {

    private MacConversionUtil() {
    }

    /**
     * ????????.
     * @param macStart ()
     * @param macEnd ()
     * @return 
     */
    public static int getCount(String macStart, String macEnd) {
        BigInteger biMacStart = new BigInteger(addrToByte(macStart));
        BigInteger biMacEnd = new BigInteger(addrToByte(macEnd));
        return biMacEnd.subtract(biMacStart).intValue() + 1;
    }

    /**
     * ????????????.
     * @param mac ?
     * @param macStart 
     * @param macEnd 
     * @return ?????true
     */
    public static boolean isScorp(String mac, String macStart, String macEnd) {
        int front = getCount(macStart, mac);
        int back = getCount(mac, macEnd);
        return front > 0 && back > 0;
    }

    /**
     * ??????.
     * @param mac 
     * @param macStart 
     * @return ?
     */
    public static int getMacAddressOrder(String mac, String macStart) {
        BigInteger biMacTarget = new BigInteger(addrToByte(mac));
        BigInteger biMacStart = new BigInteger(addrToByte(macStart));
        return biMacTarget.subtract(biMacStart).intValue();
    }

    /**
     * ?????????.
     * @param macStart .
     * @param count ?
     * @return 
     */
    public static byte[] getMacAddressWithOrderAsByte(String macStart, int count) {
        BigInteger biMacStart = new BigInteger(addrToByte(macStart));
        BigInteger biSub = BigInteger.valueOf(count);
        byte[] bMacTarget = biMacStart.add(biSub).toByteArray();
        byte[] result = new byte[6];
        int delta = 6 - bMacTarget.length;
        for (int i = 0; i < 6; i++) {
            if (i >= delta) {
                result[i] = bMacTarget[i - delta];
            } else {
                result[i] = (byte) 0;
            }
        }
        return result;
    }

    /**
     * ?????????.
     * @param baddr ??
     * @return ?
     */
    public static String byteToAddr(byte[] baddr) {
        String s = "";
        for (int i = 0; i < 6; i++) {
            s += StringUtils.leftPad(Integer.toHexString(convertToInt(baddr[i])).toUpperCase(), 2, "0");
        }
        return s;
    }

    private static byte[] addrToByte(String addr) {
        byte[] b = new byte[6];
        String[] addrs = addr.split(":");
        if (addrs.length == 1) {
            for (int i = 0; i < 6; i++) {
                b[i] = (byte) Integer.parseInt(addr.substring(i * 2, i * 2 + 2), 16);
            }
        } else if (addrs.length == 6) {
            for (int i = 0; i < 6; i++) {
                b[i] = (byte) Integer.parseInt(addrs[i], 16);
            }
        }
        return b;
    }

    /**
     * byteint?????.
     * @param b 
     * @return ?
     */
    static int convertToInt(byte b) {
        Integer intValue = new Byte(b).intValue();
        if (intValue < 0) {
            intValue += 256;
        }
        return intValue;
    }

    /**
     * HEX?????.
     * @param s HEX?MAC
     * @return ?MAC
     */
    public static String convertHexToColon(String s) {
        Object[] addrs = new Object[6];
        for (int i = 0; i < 6; i++) {
            addrs[i] = s.substring(i * 2, i * 2 + 2);
        }
        return StringUtils.join(addrs, ":");
    }

    /**
     * HEX?????.
     * @param s HEX?MAC
     * @return ?MAC
     */
    public static String convertColonToHex(String s) {
        return byteToAddr(addrToByte(s));
    }
}

/**
 * =====================================================================
 * 
 *    Copyright 2011 NTT Sofware Corporation
 * 
 *    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.
 * 
 * =====================================================================
 */