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lightning-sunbird  0.9+nobinonly
nsStreamListenerTee.cpp
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is Mozilla.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Netscape Communications Corporation.
00018  * Portions created by the Initial Developer are Copyright (C) 2002
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *   Darin Fisher <darin@netscape.com> (original author)
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
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00030  * use your version of this file under the terms of the MPL, indicate your
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00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "nsStreamListenerTee.h"
00039 
00040 NS_IMPL_ISUPPORTS3(nsStreamListenerTee,
00041                    nsIStreamListener,
00042                    nsIRequestObserver,
00043                    nsIStreamListenerTee)
00044 
00045 NS_IMETHODIMP
00046 nsStreamListenerTee::OnStartRequest(nsIRequest *request,
00047                                     nsISupports *context)
00048 {
00049     NS_ENSURE_TRUE(mListener, NS_ERROR_NOT_INITIALIZED);
00050     return mListener->OnStartRequest(request, context);
00051 }
00052 
00053 NS_IMETHODIMP
00054 nsStreamListenerTee::OnStopRequest(nsIRequest *request,
00055                                    nsISupports *context,
00056                                    nsresult status)
00057 {
00058     NS_ENSURE_TRUE(mListener, NS_ERROR_NOT_INITIALIZED);
00059     // it is critical that we close out the input stream tee
00060     if (mInputTee) {
00061         mInputTee->SetSink(nsnull);
00062         mInputTee = 0;
00063     }
00064     mSink = 0;
00065     return mListener->OnStopRequest(request, context, status);
00066 }
00067 
00068 NS_IMETHODIMP
00069 nsStreamListenerTee::OnDataAvailable(nsIRequest *request,
00070                                      nsISupports *context,
00071                                      nsIInputStream *input,
00072                                      PRUint32 offset,
00073                                      PRUint32 count)
00074 {
00075     NS_ENSURE_TRUE(mListener, NS_ERROR_NOT_INITIALIZED);
00076     NS_ENSURE_TRUE(mSink, NS_ERROR_NOT_INITIALIZED);
00077 
00078     nsCOMPtr<nsIInputStream> tee;
00079     nsresult rv;
00080 
00081     if (!mInputTee) {
00082         rv = NS_NewInputStreamTee(getter_AddRefs(tee), input, mSink);
00083         if (NS_FAILED(rv)) return rv;
00084 
00085         mInputTee = do_QueryInterface(tee, &rv);
00086         if (NS_FAILED(rv)) return rv;
00087     }
00088     else {
00089         // re-initialize the input tee since the input stream may have changed.
00090         rv = mInputTee->SetSource(input);
00091         if (NS_FAILED(rv)) return rv;
00092 
00093         tee = do_QueryInterface(mInputTee, &rv);
00094         if (NS_FAILED(rv)) return rv;
00095     }
00096 
00097     return mListener->OnDataAvailable(request, context, tee, offset, count);
00098 }
00099 
00100 NS_IMETHODIMP
00101 nsStreamListenerTee::Init(nsIStreamListener *listener,
00102                           nsIOutputStream *sink)
00103 {
00104     mListener = listener;
00105     mSink = sink;
00106     return NS_OK;
00107 }