/******************************************************************************
* The MIT License
* Copyright (c) 2003 Novell Inc.  www.novell.com
* 
* 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.
*******************************************************************************/
//
// Novell.Directory.Ldap.Events.Edir.EdirEventSource.cs
//
// Author:
//   Anil Bhatia (banil@novell.com)
//
// (C) 2003 Novell, Inc (http://www.novell.com)
//


using System;

namespace Novell.Directory.Ldap.Events.Edir
{
  /// <summary> 
  /// This is the source class for Edir events.
  /// </summary>
  public class EdirEventSource : LdapEventSource
  {
    protected EdirEventHandler edir_event;

    /// <summary>
    /// Caller has to register with this event in order to be notified of
    /// corresponding Edir events.
    /// </summary>
    public event EdirEventHandler EdirEvent
    {
      add
      {
	edir_event += value;
	ListenerAdded();
      }
      remove
      {
	edir_event -= value;
	ListenerRemoved();
      }
    }

    /// <summary> 
    /// EdirEventHandler is the delegate definition for EdirEvent.
    /// The client (listener) has to register using this delegate in order to
    /// get corresponding Edir events.
    /// </summary>
    public delegate
    void EdirEventHandler(object source,
			  EdirEventArgs objEdirEventArgs);

    protected override int GetListeners()
    {
      int nListeners = 0;
      if (null != edir_event)
	nListeners = edir_event.GetInvocationList().Length;

      return nListeners;
    }

    protected LdapConnection mConnection;
    protected MonitorEventRequest mRequestOperation = null;
    protected LdapResponseQueue mQueue = null;

    public EdirEventSource(EdirEventSpecifier[] specifier, LdapConnection conn)
    {
      if ((null == specifier) || (null == conn))
	throw new ArgumentException("Null argument specified");

      mRequestOperation = new MonitorEventRequest(specifier);
      mConnection = conn;
    }

    protected override void StartSearchAndPolling()
    {
      mQueue = mConnection.ExtendedOperation(mRequestOperation, null, null);
      int[] ids = mQueue.MessageIDs;

      if (ids.Length != 1)
      {
	throw new LdapException(
				null,
				LdapException.LOCAL_ERROR,
				"Unable to Obtain Message Id"
				);
      }

      StartEventPolling(mQueue, mConnection, ids[0]);
    }

    protected override void StopSearchAndPolling()
    {
      mConnection.Abandon(mQueue);
      StopEventPolling();
    }

    protected override bool NotifyEventListeners(LdapMessage sourceMessage,
			       EventClassifiers aClassification,
			       int nType)
    {
      bool bListenersNotified = false;
      if (null != edir_event)
      {
	if (null != sourceMessage)
	{
	  if ((sourceMessage.Type == LdapMessage.INTERMEDIATE_RESPONSE) &&
	      (sourceMessage is EdirEventIntermediateResponse))
	  {
	    edir_event(this,
		       new EdirEventArgs(sourceMessage,
					 EventClassifiers.CLASSIFICATION_EDIR_EVENT));
	    bListenersNotified = true;
	  }
	}
      }

      return bListenersNotified;
    }
  }
}