net.bican.iplib.IPAddressRangeUtil.java Source code

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Here is the source code for net.bican.iplib.IPAddressRangeUtil.java

Source

/*
 * 
 * jiplib
 * https://github.com/canbican/jiplib
 * 
 * Copyright 2015 Can Bican <can@bican.net>
 * See the file 'LICENSE' in the distribution for licensing terms.
 * 
 */
package net.bican.iplib;

import java.math.BigInteger;
import java.net.InetAddress;

import com.google.common.net.InetAddresses;

class IPAddressRangeUtil {
    static BigInteger distance(final IPAddress start, final IPAddress end) {
        final BigInteger bi1 = new BigInteger(1, start.getAddress());
        final BigInteger bi2 = new BigInteger(1, end.getAddress());
        return bi2.subtract(bi1);
    }

    static IPAddress next(final IPAddress endAddress, final IPAddress address) {
        if (address.equals(endAddress)) {
            return null;
        }
        try {
            final InetAddress result = InetAddresses.increment(address.getAddressInstance());
            return IPAddress.getInstance(result);
        } catch (final IllegalArgumentException e) {
            return null;
        }
    }

    static IPAddress previous(final IPAddress startAddress, final IPAddress address) {
        if (address.equals(startAddress)) {
            return null;
        }
        try {
            final InetAddress result = InetAddresses.decrement(address.getAddressInstance());
            return IPAddress.getInstance(result);
        } catch (final IllegalArgumentException e) {
            return null;
        }
    }
}