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lightning-sunbird  0.9+nobinonly
nsUrlListenerManager.cpp
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Pierre Phaneuf <pp@ludusdesign.com>
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "msgCore.h" // for pre-compiled headers...
00040 #include "nsUrlListenerManager.h"
00041 
00042 nsUrlListenerManager::nsUrlListenerManager() :
00043     m_listeners(nsnull)
00044 {
00045        // create a new isupports array to store our listeners in...
00046   NS_NewISupportsArray(getter_AddRefs(m_listeners));
00047 }
00048 
00049 nsUrlListenerManager::~nsUrlListenerManager()
00050 {
00051   ReleaseListeners();
00052 }
00053 
00054 void nsUrlListenerManager::ReleaseListeners()
00055 {
00056   if(m_listeners)
00057        {
00058               PRUint32 count;
00059         nsresult rv = m_listeners->Count(&count);
00060         NS_ASSERTION(NS_SUCCEEDED(rv), "m_listeners->Count() failed");
00061         if (NS_FAILED(rv)) return;
00062         
00063               for (int i = count - 1; i >= 0; i--)
00064                      m_listeners->RemoveElementAt(i);
00065        }
00066 }
00067 
00068 NS_IMPL_THREADSAFE_ISUPPORTS1(nsUrlListenerManager, nsIUrlListenerManager)
00069 
00070 nsresult nsUrlListenerManager::RegisterListener(nsIUrlListener * aUrlListener)
00071 {
00072        if (m_listeners && aUrlListener)
00073               m_listeners->AppendElement(aUrlListener);
00074 
00075        return NS_OK;
00076 }
00077 
00078 nsresult nsUrlListenerManager::UnRegisterListener(nsIUrlListener * aUrlListener)
00079 {
00080        if (m_listeners && aUrlListener)
00081               m_listeners->RemoveElement(aUrlListener);
00082        return NS_OK;
00083 }
00084 
00085 nsresult nsUrlListenerManager::BroadcastChange(nsIURI * aUrl, nsUrlNotifyType notification, nsresult aErrorCode)
00086 {
00087        NS_PRECONDITION(aUrl, "we shouldn't get OnStartRunningUrl for the url listener manager without a url...");
00088        nsresult rv = NS_OK;
00089 
00090        if (m_listeners && aUrl)
00091        {
00092               // enumerate over all url listeners...(Start at the end and work our way down)
00093               nsCOMPtr<nsIUrlListener> listener;
00094     nsCOMPtr<nsISupports> aSupports;
00095               PRUint32 index;
00096     m_listeners->Count(&index);
00097               for (; index > 0; index--)
00098               {
00099       m_listeners->GetElementAt(index-1, getter_AddRefs(aSupports)); 
00100                      listener = do_QueryInterface(aSupports);
00101 
00102                      if (listener)
00103                      {
00104                             if (notification == nsUrlNotifyStartRunning)
00105                                    listener->OnStartRunningUrl(aUrl);
00106                             else if (notification == nsUrlNotifyStopRunning)
00107                                    listener->OnStopRunningUrl(aUrl, aErrorCode);
00108                      }
00109 
00110               } // for each listener
00111        } // if m_listeners && aUrl
00112 
00113        return rv;
00114 }
00115 
00116 nsresult nsUrlListenerManager::OnStartRunningUrl(nsIMsgMailNewsUrl * aUrl)
00117 {
00118        return BroadcastChange(aUrl, nsUrlNotifyStartRunning, 0);
00119 }
00120 
00121 nsresult nsUrlListenerManager::OnStopRunningUrl(nsIMsgMailNewsUrl * aUrl, nsresult aErrorCode)
00122 {
00123        nsresult rv = BroadcastChange(aUrl, nsUrlNotifyStopRunning, aErrorCode);
00124   // in order to prevent circular references, after we issue on stop running url, 
00125   // go through and release all of our listeners...
00126   ReleaseListeners();
00127   return rv;
00128 }
00129