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/*******************************************************************************
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 * File: IPAddr.java
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 * Author: Ira W. Snyder (devel@irasnyder.com)
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 * License: GNU General Public License v2
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 * Class: CS380 - Computer Networking
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 *
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 * Assignment: Project #3
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 * Date Last Modified: 2006-02-15
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 *
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 * Purpose: Implement a simple-to-access representation of an IP Address.
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 * This is used extensively by the DHCPTable class. This class allows easy
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 * access to each of the fields in the IP Address.
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 ******************************************************************************/
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public class IPAddr
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{
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    /* Instance Variables */
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    private int[] fields = new int[4];
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    /**
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     * Method: IPAddr constructor
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     * Purpose: Construct an IPAddr object
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     */
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    public IPAddr (String ip)
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    {
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        int i;
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        String[] sp = ip.split("\\.");
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        // We must have a bad argument
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        if (sp.length < 4)
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            throw new IllegalArgumentException();
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        // Set the private variable array to the argument
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        for (i=0; i<sp.length; i++)
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            fields[i] = Integer.parseInt(sp[i]);
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    }
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    /**
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     * Method: getField
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     * Purpose: Get one of the fields of an IP Address
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     */
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    public int getField (int fieldNum)
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    {
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        if (fieldNum < 0 || fieldNum > 3)
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            throw new IllegalArgumentException();
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        return fields[fieldNum];
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    }
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    /**
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     * Method: toString
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     * Purpose: Convert this IPAddr object to a String
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     */
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    public String toString ()
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    {
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        String s = new String("" + fields[0] + '.' + fields[1] + '.'
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                            + fields[2] + '.' + fields[3]);
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        return s;
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    }
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}
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