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/*
* Wireless Host Monitor
*
* Copyright (C) 2003, Jonathan Sevy <jsevy@mcs.drexel.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package airporthostmon;
import java.util.*;
import java.io.*;
public class MacAddress
implements Comparable, Serializable
{
private byte[] macAddress;
public MacAddress(byte[] address)
{
macAddress = address;
}
public MacAddress(String macAddressString)
throws ValueFormatException
{
this.macAddress = parseMacAddress(macAddressString);
}
private byte[] parseMacAddress(String addressString)
throws ValueFormatException
{
try
{
StringTokenizer st = new StringTokenizer(addressString, " .-"); // break on spaces, dots or dashes
int size = 0;
while (st.hasMoreTokens())
{
// figure out how many values are in string
size++;
st.nextToken();
}
if (size != 6)
{
throw new ValueFormatException("Wrong number of components supplied in MAC address");
}
byte[] returnBytes = new byte[size];
st = new StringTokenizer(addressString, " .-");
for (int i = 0; i < size; i++)
{
int addressComponent = (Integer.parseInt(st.nextToken(), 16));
if ((addressComponent < 0) || (addressComponent > 255))
throw new ValueFormatException("Invalid characters used in MAC address");
returnBytes[i] = (byte)addressComponent;
}
return returnBytes;
}
catch (NumberFormatException e)
{
String messageString = "Invalid characters used in MAC address\n";
messageString += "MAC address must be specified as pairs of hex digits separated by spaces.\n";
messageString += " Example: 00 02 2d 37 1f a6";
throw new ValueFormatException(messageString);
}
catch (ValueFormatException e)
{
// augment the message string
String messageString = e.getMessage() + "\n";
messageString += "MAC address must be specified as pairs of hex digits separated by spaces.\n";
messageString += " Example: 00 02 2d 37 1f a6";
throw new ValueFormatException(messageString);
}
}
public boolean equals(Object other)
{
if (!(other instanceof MacAddress))
return false;
MacAddress otherAddress = (MacAddress)other;
if (macAddress.length != otherAddress.macAddress.length)
return false;
for (int i = 0; i < macAddress.length; i++)
{
if (this.macAddress[i] != otherAddress.macAddress[i])
return false;
}
// all address components equal; return true
return true;
}
public int compareTo(Object other)
{
MacAddress otherAddress = (MacAddress)other;
if (macAddress.length != otherAddress.macAddress.length)
{
if (macAddress.length < otherAddress.macAddress.length)
return -1;
else
return 1;
}
for (int i = 0; i < macAddress.length; i++)
{
int unsigned = this.macAddress[i];
if (unsigned < 0)
unsigned += 256;
int otherUnsigned = otherAddress.macAddress[i];
if (otherUnsigned < 0)
otherUnsigned += 256;
if (unsigned < otherUnsigned)
return -1;
else if (unsigned > otherUnsigned)
return 1;
}
// if get to here, they're equal
return 0;
}
private String hexByte(byte b)
{
int pos = b;
if (pos < 0)
pos += 256;
String returnString = new String();
returnString += Integer.toHexString(pos/16);
returnString += Integer.toHexString(pos%16);
return returnString;
}
/**
* Returns a space-separated hex string
*/
public String toString()
{
String returnString = new String();
for (int i = 0; i < macAddress.length; i++)
{
returnString += hexByte(macAddress[i]) + " ";
}
return returnString;
}
}
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