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 * Date Last Modified: 2006-02-15
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 * Date Last Modified: 2006-02-15
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 *
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 *
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 * Purpose: //FIXME
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 * Purpose: //FIXME
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 ******************************************************************************/
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 ******************************************************************************/
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import java.util.Vector;
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import java.util.Date;
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public class DHCPTable
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public class DHCPTable
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{
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{
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    private int defaultVectorSize = 10;
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    private Vector table = new Vector (defaultVectorSize);
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    private DHCPTableEntry[] table = new DHCPTableEntry[100];
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    private String lowestIP = "134.71.24.1";
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    private IPAddr lowestIP = new IPAddr("134.71.24.1");
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    private String highestIP = "134.71.24.100";
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    private IPAddr highestIP = new IPAddr("134.71.24.100");
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    private String lowestFreeIP = lowestIP;
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    private long timeoutMS = 8000; // 8000 millisec by default
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    public DHCPTable () {}
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    public DHCPTable ()
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    {
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        int i;
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        final String startStr = "134.71.24.";
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        IPAddr ip = null;
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        for (i=1; i<=table.length; i++)
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        {
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            ip = new IPAddr (startStr + i);
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            table[i-1] = new DHCPTableEntry("", ip, 0);
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        }
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    }
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    private String getFirstFreeIPAddr ()
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    private DHCPTableEntry getFirstFreeEntry ()
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    {
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    {
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        int i = 0;
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        int i = 0;
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        for (i=0; i<table.size(); i++)
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        for (i=0; i<table.length; i++)
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            if (table[i].getLeaseStart() == 0)
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                return table[i];
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        throw new ArrayIndexOutOfBoundsException();
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    }
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    public DHCPTableEntry addEntry (String HWAddr)
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    {
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        long curTime = new Date().getTime();
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        DHCPTableEntry e = getFirstFreeEntry();
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        e.setHWAddr (HWAddr);
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        e.setLeaseStart (curTime);
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        return e;
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    }
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    }
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    /**
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    /**
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     * Method: compareIPAddr()
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     * Method: timeoutEntry()
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     * Purpose: Compare two IP Addresses, and figure out which is greater.
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     * Purpose: tries to find an expired entry. If it has found one, it expires it
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     * Return Values: 0 - Equal Addresses
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     *                1 - IP #1 is greater
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     * and returns it, otherwise it returns null.
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     *                2 - IP #2 is greater
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     */
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     */
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    public int compareIPAddr (String ip1, String ip2)
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    {
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    public DHCPTableEntry addEntry (String HWAddr)
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    public DHCPTableEntry timeoutEntry ()
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    {
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    {
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        int i;
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        String freeIPAddr = lowestIP;
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        long curTime = new Date().getTime();
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        DHCPTableEntry te;
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        DHCPTableEntry e = null;
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        for (i=0; i<table.length; i++)
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        for (Enumeration e = table.elements(); e.hasMoreElements(); )
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            if (table[i].getLeaseStart() != 0 && curTime > (table[i].getLeaseStart() + timeoutMS))
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        {
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            {
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                e = new DHCPTableEntry (table[i].getHWAddr(),
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                                        table[i].getIPAddr(),
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                                        table[i].getLeaseStart());
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                table[i].setHWAddr ("");
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                table[i].setLeaseStart (0);
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            te = e.nextElement();
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                return e;
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            }
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            if (te.getIPAddr() <
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        return e; // will be null if an entry was not found
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    }
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    public DHCPTableEntry timeoutEntry (IPAddr ip)
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        }
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    {
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        int i = ip.getField(3) - 1;
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        long curTime = new Date().getTime();
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        DHCPTableEntry e = null;
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        if (curTime > (table[i].getLeaseStart() + timeoutMS))
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        {
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            // Make a copy of the object
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        DHCPTableEntry dte = new DHCPTableEntry (HWAddr, );
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            e = new DHCPTableEntry (table[i].getHWAddr(),
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                                    table[i].getIPAddr(),
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                                    table[i].getLeaseStart());
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        table.addEntry (dte);
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            table[i].setHWAddr ("");
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            table[i].setLeaseStart (0);
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            return e;
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        }
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        return dte;
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        return null;
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    }
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    }
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}
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}
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