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+/* -*- Mode: C++; tab-width: 2; 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 nsIURIContentListener;
+interface nsIURI;
+interface nsILoadGroup;
+interface nsIProgressEventSink;
+interface nsIChannel;
+interface nsIRequest;
+interface nsIStreamListener;
+interface nsIInputStream;
+interface nsIInterfaceRequestor;
+
+/**
+ * The uri dispatcher is responsible for taking uri's, determining
+ * the content and routing the opened url to the correct content
+ * handler.
+ *
+ * When you encounter a url you want to open, you typically call
+ * openURI, passing it the content listener for the window the uri is
+ * originating from. The uri dispatcher opens the url to discover the
+ * content type. It then gives the content listener first crack at
+ * handling the content. If it doesn't want it, the dispatcher tries
+ * to hand it off one of the registered content listeners. This allows
+ * running applications the chance to jump in and handle the content.
+ *
+ * If that also fails, then the uri dispatcher goes to the registry
+ * looking for the preferred content handler for the content type
+ * of the uri. The content handler may create an app instance
+ * or it may hand the contents off to a platform specific plugin
+ * or helper app. Or it may hand the url off to an OS registered
+ * application.
+ */
+[scriptable, uuid(8762c4e7-be35-4958-9b81-a05685bb516d)]
+interface nsIURILoader : nsISupports
+{
+ /**
+ * @name Flags for opening URIs.
+ */
+ /* @{ */
+ /**
+ * Should the content be displayed in a container that prefers the
+ * content-type, or will any container do.
+ */
+ const unsigned long IS_CONTENT_PREFERRED = 1 << 0;
+ /**
+ * If this flag is set, only the listener of the specified window context will
+ * be considered for content handling; if it refuses the load, an error will
+ * be indicated.
+ */
+ const unsigned long DONT_RETARGET = 1 << 1;
+ /* @} */
+
+ /**
+ * As applications such as messenger and the browser are instantiated,
+ * they register content listener's with the uri dispatcher corresponding
+ * to content windows within that application.
+ *
+ * Note to self: we may want to optimize things a bit more by requiring
+ * the content types the registered content listener cares about.
+ *
+ * @param aContentListener
+ * The listener to register. This listener must implement
+ * nsISupportsWeakReference.
+ *
+ * @see the nsIURILoader class description
+ */
+ void registerContentListener (in nsIURIContentListener aContentListener);
+ void unRegisterContentListener (in nsIURIContentListener aContentListener);
+
+ /**
+ * OpenURI requires the following parameters.....
+ * @param aChannel
+ * The channel that should be opened. This must not be asyncOpen'd yet!
+ * If a loadgroup is set on the channel, it will get replaced with a
+ * different one.
+ * @param aFlags
+ * Combination (bitwise OR) of the flags specified above. 0 indicates
+ * default handling.
+ * @param aWindowContext
+ * If you are running the url from a doc shell or a web shell, this is
+ * your window context. If you have a content listener you want to
+ * give first crack to, the uri loader needs to be able to get it
+ * from the window context. We will also be using the window context
+ * to get at the progress event sink interface.
+ * <b>Must not be null!</b>
+ */
+ void openURI(in nsIChannel aChannel,
+ in unsigned long aFlags,
+ in nsIInterfaceRequestor aWindowContext);
+
+ /**
+ * Loads data from a channel. This differs from openURI in that the channel
+ * may already be opened, and that it returns a stream listener into which the
+ * caller should pump data. The caller is responsible for opening the channel
+ * and pumping the channel's data into the returned stream listener.
+ *
+ * Note: If the channel already has a loadgroup, it will be replaced with the
+ * window context's load group, or null if the context doesn't have one.
+ *
+ * If the window context's nsIURIContentListener refuses the load immediately
+ * (e.g. in nsIURIContentListener::onStartURIOpen), this method will return
+ * NS_ERROR_WONT_HANDLE_CONTENT. At that point, the caller should probably
+ * cancel the channel if it's already open (this method will not cancel the
+ * channel).
+ *
+ * If flags include DONT_RETARGET, and the content listener refuses the load
+ * during onStartRequest (e.g. in canHandleContent/isPreferred), then the
+ * returned stream listener's onStartRequest method will return
+ * NS_ERROR_WONT_HANDLE_CONTENT.
+ *
+ * @param aChannel
+ * The channel that should be loaded. The channel may already be
+ * opened. It must not be closed (i.e. this must be called before the
+ * channel calls onStopRequest on its stream listener).
+ * @param aFlags
+ * Combination (bitwise OR) of the flags specified above. 0 indicates
+ * default handling.
+ * @param aWindowContext
+ * If you are running the url from a doc shell or a web shell, this is
+ * your window context. If you have a content listener you want to
+ * give first crack to, the uri loader needs to be able to get it
+ * from the window context. We will also be using the window context
+ * to get at the progress event sink interface.
+ * <b>Must not be null!</b>
+ */
+ nsIStreamListener openChannel(in nsIChannel aChannel,
+ in unsigned long aFlags,
+ in nsIInterfaceRequestor aWindowContext);
+
+ /**
+ * Stops an in progress load
+ */
+ void stop(in nsISupports aLoadCookie);
+};
+