HubManager.cs :  » Business-Application » DC » DCSharp » Backend » Managers » C# / CSharp Open Source

/* 
 * Copyright (C) 2004-2005 Jonathan Bindel
 * Copyright (C) 2006-2007 Eskil Bylund
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

using System;
using System.Collections;
using System.Collections.Generic;

using DCSharp.Backend.Connections;
using DCSharp.Backend.Objects;

namespace DCSharp.Backend.Managers{
  public sealed class HubManager : IEnumerable<HubConnection>
  {
    public event EventHandler<ConnectionEventArgs> HubAdded;
    public event EventHandler<ConnectionEventArgs> HubRemoved;
    public event EventHandler<ConnectionEventArgs> HubStateChanged;

    private List<HubConnection> hubs;

    public HubManager()
    {
      hubs = new List<HubConnection>();
    }

    #region Properties

    public int Count
    {
      get { return hubs.Count; }
    }

    public HubConnection[] Hubs
    {
      get
      {
        lock (hubs)
        {
          return hubs.ToArray();
        }
      }
    }

    public object SyncRoot
    {
      get { return hubs; }
    }

    #endregion

    #region Methods

    public void Add(HubConnection hub)
    {
      if (hub == null)
      {
        throw new ArgumentNullException("hub");
      }
      
      lock (hubs)
      {
        if (!hubs.Contains(hub))
        {
          hub.StateChanged += OnHubStateChanged;
          
          hubs.Add(hub);
          OnHubAdded(hub);
        }
      }
    }

    public void Remove(HubConnection hub)
    {
      if (hub == null)
      {
        throw new ArgumentNullException("hub");
      }
      
      lock (hubs)
      {
        if (hubs.Contains(hub))
        {
          hub.StateChanged -= OnHubStateChanged;
          
          hubs.Remove(hub);
          OnHubRemoved(hub);
        }
      }
    }

    public bool Contains(HubConnection hub)
    {
      return hubs.Contains(hub);
    }

    public HubConnection Find(Predicate<HubConnection> match)
    {
      if (match == null)
      {
        throw new ArgumentNullException("match");
      }
      
      lock (hubs)
      {
        return hubs.Find(match);
      }
    }

    public void ForEach(Action<HubConnection> action)
    {
      if (action == null)
      {
        throw new ArgumentNullException("action");
      }
      
      lock (hubs)
      {
        hubs.ForEach(action);
      }
    }

    public IEnumerator<HubConnection> GetEnumerator()
    {
      return hubs.GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
      return GetEnumerator();
    }

    public HubConnection GetHub(string hostname)
    {
      return Find(delegate(HubConnection hub)
      {
        return hub.Hostname == hostname || hub.Address == hostname;
      });
    }

    public HubConnection GetHubWithUser(User user)
    {
      return Find(delegate(HubConnection hub)
      {
        return hub.Users[user] != null;
      });
    }

    protected void OnHubAdded(HubConnection hub)
    {
      if (HubAdded != null)
      {
        HubAdded(this, new ConnectionEventArgs(hub));
      }
    }

    protected void OnHubRemoved(HubConnection hub)
    {
      if (HubRemoved != null)
      {
        HubRemoved(this, new ConnectionEventArgs(hub));
      }
    }

    protected void OnHubStateChanged(object obj, EventArgs args)
    {
      if (HubStateChanged != null)
      {
        HubStateChanged(this, new ConnectionEventArgs((Connection)obj));
      }
    }

    #endregion
  }
}