RouterFactory.java

/*
 * The MIT License
 *
 * Copyright 2014 sorrge.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.nyan.dch.communication.transport.tcpip.NAT;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import net.sbbi.upnp.impls.InternetGatewayDevice;

/**
 *
 * @author chris
 */
public class RouterFactory
{
  /**
   * The timeout in milliseconds for finding a router device.
   */
  private final static int DISCOVERY_TIMEOUT = 5000;

  public List<Router> findRouters() throws Exception
  {
    final InternetGatewayDevice[] devices;
    try
    {
      devices = InternetGatewayDevice.getDevices(DISCOVERY_TIMEOUT);
    }
    catch (final IOException e)
    {
      throw new Exception("Could not find devices", e);
    }
    if (devices == null || devices.length == 0)
      return Collections.emptyList();
    
    final List<Router> routers = new ArrayList<>(devices.length);
    for (final InternetGatewayDevice device : devices)
      routers.add(new Router(device));
    
    return routers;
  }

  @Override
  public String toString()
  {
    return "SBBI UPnP lib";
  }
}