001package voyeur.types;
002/*-
003 * ##########################################################################
004 * Local Area Network Voyeur
005 * %%
006 * Copyright (C) 2019 - 2022 Allen D. Ball
007 * %%
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *      http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 * ##########################################################################
020 */
021import java.net.NetworkInterface;
022import java.net.SocketException;
023import java.util.ArrayList;
024import java.util.stream.Stream;
025
026import static java.util.stream.Collectors.joining;
027
028/**
029 * Hardware Address.
030 *
031 * @author {@link.uri mailto:ball@hcf.dev Allen D. Ball}
032 */
033public class HardwareAddress {
034    private final ArrayList<Byte> list = new ArrayList<>();
035
036    /**
037     * {@link NetworkInterface} constructor.
038     *
039     * @param   netif           The {@link NetworkInterface}.
040     *
041     * @throws  SocketException If the hardware address canoot be read.
042     */
043    public HardwareAddress(NetworkInterface netif) throws SocketException {
044        this(netif.getHardwareAddress());
045    }
046
047    /**
048     * {@link String} constructor.
049     *
050     * @param   string          The {@link String} representation.
051     */
052    public HardwareAddress(String string) {
053        Stream.of(string.split("[:]"))
054            .map(t -> Integer.valueOf(t, 16))
055            .map(t -> t & 0xFF)
056            .forEach(t -> list.add(t.byteValue()));
057    }
058
059    /**
060     * {@code byte} array constructor.
061     *
062     * @param   bytes           The {@code byte} array representing the
063     *                          hardware address.
064     */
065    public HardwareAddress(byte[] bytes) {
066        if (bytes != null) {
067            for (byte b : bytes) {
068                list.add(b);
069            }
070        }
071    }
072
073    @Override
074    public String toString() {
075        String string =
076            list.stream()
077            .map(t -> String.format("%02x", t))
078            .collect(joining(":"));
079
080        return string;
081    }
082}