SearchManager.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.Generic;
using System.Timers;

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

namespace DCSharp.Backend.Managers{
  public class SearchManager
  {
    public EventHandler<SearchEventArgs> SearchTimedOut;
    
    private HubManager hubManager;
    
    private List<SearchInfo> searches;
    private Dictionary<SearchInfo, Timer> timers;

    public SearchManager(HubManager hubManager)
    {
      if (hubManager == null)
      {
        throw new ArgumentNullException("hubManager");
      }
      this.hubManager = hubManager;
      
      searches = new List<SearchInfo>();
      timers = new Dictionary<SearchInfo, Timer>();
    }

    #region Methods

    public void Search(SearchInfo searchInfo)
    {
      Search(searchInfo, TimeSpan.Zero);
    }
    
    public void Search(SearchInfo searchInfo, TimeSpan timeout)
    {
      Search(searchInfo, timeout, hubManager.Hubs);
    }
    
    public void Search(SearchInfo searchInfo, TimeSpan timeout,
      params HubConnection[] hubs)
    {
      if (searchInfo == null)
      {
        throw new ArgumentNullException("searchInfo");
      }
      
      lock (searches)
      {
        if (searches.Contains(searchInfo))
        {
          return;
        }
        searches.Add(searchInfo);
        
        foreach (HubConnection hub in hubs)
        {
          hub.Search(searchInfo);
        }
        StartTimer(searchInfo, timeout);
      }
    }

    public void StopSearch(SearchInfo searchInfo)
    {
      if (searchInfo == null)
      {
        throw new ArgumentNullException("searchInfo");
      }
      
      lock (searches)
      {
        StopTimer(searchInfo);
        searches.Remove(searchInfo);
      }
    }

    public bool Contains(SearchInfo searchInfo)
    {
      return searches.Contains(searchInfo);
    }

    public void AddResult(SearchResult result)
    {
      if (result == null)
      {
        throw new ArgumentNullException("result");
      }
      
      lock (searches)
      {
        foreach (SearchInfo searchInfo in searches)
        {
          if (Match(searchInfo, result))
          {
            searchInfo.Add(result);
          }
        }
      }
    }
    
    protected bool Match(SearchInfo searchInfo, SearchResult result)
    {
      // TODO: Check the type.
      if (searchInfo.TTH == result.TTH)
      {
        return true;
      }
      
      if ((searchInfo.MaxSize != null && result.Size > searchInfo.MaxSize) ||
        (searchInfo.MinSize != null && result.Size < searchInfo.MinSize))
      {
        return false;
      }
      if (searchInfo.Keywords != null &&
        !Util.StringMatchesKeywords(result.Path, searchInfo.Keywords))
      {
        return false;
      }
      return true;
    }
    
    protected virtual void OnSearchTimedOut(SearchInfo searchInfo)
    {
      if (SearchTimedOut != null)
      {
        SearchTimedOut(this, new SearchEventArgs(searchInfo));
      }
    }

    private void StartTimer(SearchInfo searchInfo, TimeSpan timeout)
    {
      if (timeout != TimeSpan.Zero)
      {
        Timer timer = new Timer(timeout.TotalMilliseconds);
        timer.Elapsed += delegate
        {
          StopSearch(searchInfo);
          OnSearchTimedOut(searchInfo);
        };
        timers.Add(searchInfo, timer);
        timer.Start();
      }
    }

    private void StopTimer(SearchInfo searchInfo)
    {
      Timer timer;
      if (timers.TryGetValue(searchInfo, out timer))
      {
        timer.Dispose();
        timers.Remove(searchInfo);
      }
    }

    #endregion
  }
}