inet.ipaddr.ipv4.IPv4JoinedSegments Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ipaddress Show documentation
Library for handling IP addresses, both IPv4 and IPv6
There is a newer version: 5.5.1
/*
 * Copyright 2017 Sean C Foley
 *
 * 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
 *     or at
 *     https://github.com/seancfoley/IPAddress/blob/master/LICENSE
 *
 * 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.
 */

package inet.ipaddr.ipv4;

import inet.ipaddr.AddressValueException;
import inet.ipaddr.PrefixLenException;
import inet.ipaddr.format.IPAddressJoinedSegments;

/**
 * 
 * @author sfoley
 *
 */
public class IPv4JoinedSegments extends IPAddressJoinedSegments {
	
	private static final long serialVersionUID = 4L;
	private static int MAX_CHARS[] = new int[IPv4Address.SEGMENT_COUNT - 1];
	
	public IPv4JoinedSegments(int joinedCount, int value) {
		super(joinedCount, value);
		if(joinedCount >= IPv4Address.SEGMENT_COUNT) {
			throw new AddressValueException(joinedCount);
		}
	}

	public IPv4JoinedSegments(int joinedCount, long value, Integer segmentPrefixLength) {
		super(joinedCount, value, segmentPrefixLength);
		if(joinedCount >= IPv4Address.SEGMENT_COUNT) {
			throw new AddressValueException(joinedCount);
		} else if(segmentPrefixLength != null && segmentPrefixLength > IPv4Address.BIT_COUNT) {
			throw new PrefixLenException(segmentPrefixLength);
		} else {
			checkMax(value);
		} 
	}

	public IPv4JoinedSegments(int joinedCount, long lower, long upper, Integer segmentPrefixLength) {
		super(joinedCount, lower, upper, segmentPrefixLength);
		if(joinedCount >= IPv4Address.SEGMENT_COUNT) {
			throw new AddressValueException(joinedCount);
		} else if(segmentPrefixLength != null && segmentPrefixLength > IPv4Address.BIT_COUNT) {
			throw new PrefixLenException(segmentPrefixLength);
		}  else {
			checkMax(getUpperValue());
		}
	}
	
	private void checkMax(long val) {
		long max = 0;
		switch(joinedCount) {
		case 0:
			max = 255;
			break;
		case 1:
			max = 65535;
			break;
		case 2:
			max = 16777215;
			break;
		case 3:
			max = 4294967295L;
			break;
		}
		if(value > max) {
			throw new AddressValueException(value);
		}
	}

	@Override
	public int getMaxDigitCount() {
		int result = MAX_CHARS[joinedCount - 1];
		if(result == 0) {
			result = MAX_CHARS[joinedCount - 1] = super.getMaxDigitCount();
		}
		return result;
	}

	@Override
	protected long getDivisionNetworkMask(int bits) {
		int totalBits = IPv4Address.BITS_PER_SEGMENT * (joinedCount + 1);
		long fullMask = ~(~0L << totalBits); //totalBits must be 6 digits at most for this shift to work per the java spec (so it must be less than 2^6 = 64)
		long networkMask = fullMask & (fullMask << (totalBits - bits));
		return networkMask;
	}

	@Override
	protected long getDivisionHostMask(int bits) {
		int totalBits = IPv4Address.BITS_PER_SEGMENT * (joinedCount + 1);
		long hostMask = ~(~0L << (totalBits - bits));
		return hostMask;
	}

	@Override
	protected int getBitsPerSegment() {
		return IPv4Address.BITS_PER_SEGMENT;
	}

	@Override
	public int getDefaultTextualRadix() {
		return IPv4Address.DEFAULT_TEXTUAL_RADIX;
	}
}