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Java8 utilities for networking stuff.
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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.net;

import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;

/**
 * @author [email protected] (Marcio Endo)
 */
class SimpleConfiguredNetworkAdapter implements ConfiguredNetworkAdapter {

  private static final IpAddress BROADCAST = IpAddress.of(255, 255, 255, 255);
  private static final HardwareAddress EMPTY = HardwareAddress.wrap(new byte[] {});

  private final String name;
  private final HardwareAddress hardwareAddress;
  private final IpAddress ipAddress;
  private final IpAddress broadcast;

  private SimpleConfiguredNetworkAdapter(String name,
                                         HardwareAddress hardwareAddress,
                                         IpAddress ipAddress,
                                         IpAddress broadcast) {
    this.name = name;
    this.hardwareAddress = hardwareAddress;
    this.ipAddress = ipAddress;
    this.broadcast = broadcast;
  }

  public static ConfiguredNetworkAdapter of(NetworkInterface iface, InterfaceAddress address) {
    return new SimpleConfiguredNetworkAdapter(
        iface.getName(),
        hardwareAddress(iface),
        IpAddress.of(address.getAddress()),
        broadcast(address));
  }

  private static IpAddress broadcast(InterfaceAddress address) {
    InetAddress broadcast = address.getBroadcast();
    return broadcast != null ? IpAddress.of(broadcast) : BROADCAST;
  }

  private static HardwareAddress hardwareAddress(NetworkInterface iface) {
    try {
      return HardwareAddress.wrap(iface.getHardwareAddress());
    } catch (SocketException e) {
      return EMPTY;
    }
  }

  @Override
  public String name() {
    return name;
  }

  @Override
  public HardwareAddress hardwareAddress() {
    return hardwareAddress;
  }

  @Override
  public IpAddress ipAddress() {
    return ipAddress;
  }

  @Override
  public IpAddress broadcast() {
    return broadcast;
  }

}