IPRange.java

/*
 * Copyright 2014 jts
 *
 * 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
 *
 * 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 ru.jts.common.network.util;

/**
 * @author : Camelion
 * @date : 17.08.12  22:43
 * <p/>
 * Класс-помощник для создания перенаправлений.
 * Что-то подобное используется в Aion-emu, L2J, L2P, etc.
 */
public class IPRange {

	private long minAddress;
	private long maxAddress;
	private byte[] minAddressInByte;
	private byte[] maxAddressInByte;
	private byte[] routeAddress;

	public IPRange(String minAddress, String maxAddress, String routeAddress) {
		this.minAddress = toLong(minAddress);
		this.maxAddress = toLong(maxAddress);
		this.minAddressInByte = toByteArray(minAddress);
		this.maxAddressInByte = toByteArray(maxAddress);
		this.routeAddress = toByteArray(routeAddress);
	}

	public IPRange(byte[] minAddress, byte[] maxAddress, byte[] routeAddress) {
		this.minAddress = toLong(minAddress);
		this.maxAddress = toLong(maxAddress);
		this.minAddressInByte = minAddress;
		this.maxAddressInByte = maxAddress;
		this.routeAddress = routeAddress;
	}

	/**
	 * Разбивает адрес типа IPv4 на массив длиной 4
	 * Например 127.0.0.1 = {127, 0, 0, 1};
	 *
	 * @param address - адрес в формате IPv4
	 * @return - массив байтов, содержащий данный адрес
	 */
	public static byte[] toByteArray(String address) {
		byte[] result = new byte[4];
		String[] strings = address.split("\\.");
		for (int i = 0, n = strings.length; i < n; i++) {
			result[i] = (byte) Integer.parseInt(strings[i]);
		}

		return result;
	}

	/**
	 * Переводит IPv4 адрес в число типа long
	 *
	 * @param address - String адрес в формате IPv4
	 * @return число типа long
	 */
	public long toLong(String address) {
		byte[] byteAddress = toByteArray(address);
		long result = 0;
		result += (byteAddress[3] & 0xFF);
		result += ((byteAddress[2] & 0xFF) << 8);
		result += ((byteAddress[1] & 0xFF) << 16);
		result += (byteAddress[0] << 24);
		return result & 0xFFFFFFFFL;
	}

	/**
	 * Переводит IPv4 адрес в число типа long
	 *
	 * @param address - byte[] адрес в формате IPv4
	 * @return число типа long
	 */
	public long toLong(byte[] address) {
		long result = 0;
		result += (address[3] & 0xFF);
		result += ((address[2] & 0xFF) << 8);
		result += ((address[1] & 0xFF) << 16);
		result += (address[0] << 24);
		return result & 0xFFFFFFFFL;
	}


	/**
	 * Проверяет, находится ли адрес в заданом диапазоне адресов
	 *
	 * @param address - проверяемый адрес
	 * @return - true, если адрес попадает в диапазон, иначе - false
	 */
	public boolean isInRange(String address) {
		long addr = toLong(address);
		return addr >= minAddress && addr <= maxAddress;
	}

	public byte[] getRouteAddress() {
		return routeAddress;
	}

	public byte[] getMinAddressInByte() {
		return minAddressInByte;
	}

	public byte[] getMaxAddressInByte() {
		return maxAddressInByte;
	}
}