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/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsISupports.idl"
interface nsIChannel;
interface nsIInputStream;
interface nsIStreamListener;
%{C++
#define NS_ISTREAMCONVERTER_KEY "@mozilla.org/streamconv;1"
%}
/**
* The nsIStreamConverterService is a higher level stream converter factory
* responsible for locating and creating stream converters
* (nsIStreamConverter).
*
* This service retrieves an interface that can convert data from a particular
* MIME type, to a particular MIME type. It is responsible for any intermediary
* conversion required in order to get from X to Z, assuming direct conversion
* is not possible.
*
* @author Jud Valeski
* @see nsIStreamConverter
*/
[scriptable, uuid(f2b1ab53-f0bd-4adb-9365-e59b1701a258)]
interface nsIStreamConverterService : nsISupports {
/**
* Tests whether conversion between the two specified types is possible.
* This is cheaper than calling convert()/asyncConvertData(); it is not
* necessary to call this function before calling one of those, though.
*/
boolean canConvert(in string aFromType, in string aToType);
/**
* Returns the content type that will be returned from a converter
* created with aFromType and * /*.
* Can fail if no converters support this conversion, or if the
* output type isn't known in advance.
*/
ACString convertedType(in ACString aFromType, in nsIChannel aChannel);
/**
* <b>SYNCHRONOUS VERSION</b>
* Converts a stream of one type, to a stream of another type.
*
* Use this method when you have a stream you want to convert.
*
* @param aFromStream The stream representing the original/raw data.
* @param aFromType The MIME type of aFromStream.
* @param aToType The MIME type of the returned stream.
* @param aContext Either an opaque context, or a converter specific
* context (implementation specific).
* @return The converted stream. NOTE: The returned stream
* may not already be converted. An efficient stream
* converter implementation will convert data on
* demand rather than buffering the converted data
* until it is used.
*/
nsIInputStream convert(in nsIInputStream aFromStream,
in string aFromType,
in string aToType,
in nsISupports aContext);
/**
* <b>ASYNCHRONOUS VERSION</b>
* Retrieves a nsIStreamListener that receives the original/raw data via its
* nsIStreamListener::OnDataAvailable() callback, then converts and pushes
* the data to aListener.
*
* Use this method when you want to proxy (and convert) nsIStreamListener
* callbacks asynchronously.
*
* @param aFromType The MIME type of the original/raw data.
* @param aToType The MIME type of the converted data.
* @param aListener The listener that receives the converted data.
* @param aCtxt Either an opaque context, or a converter specific
* context (implementation specific).
* @return A nsIStreamListener that receives data via its
* OnDataAvailable() method.
*/
nsIStreamListener asyncConvertData(in string aFromType,
in string aToType,
in nsIStreamListener aListener,
in nsISupports aContext);
};