/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=4 sw=4 et tw=80:
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Mozilla browser.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications, Inc.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Travis Bogard <travis@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsDocShell_h__
#define nsDocShell_h__

#include "nsIPresShell.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"
#include "nsIViewManager.h"
#include "nsIScrollableView.h"
#include "nsIContentViewer.h"
#include "nsIPrefBranch.h"
#include "nsVoidArray.h"
#include "nsInterfaceHashtable.h"
#include "nsIScriptContext.h"
#include "nsITimer.h"

#include "nsCDocShell.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIContentViewerContainer.h"
#include "nsIDeviceContext.h"

#include "nsDocLoader.h"
#include "nsIURILoader.h"
#include "nsIEditorDocShell.h"

#include "nsWeakReference.h"

// Local Includes
#include "nsDSURIContentListener.h"
#include "nsDocShellEditorData.h"

// Helper Classes
#include "nsCOMPtr.h"
#include "nsPoint.h" // mCurrent/mDefaultScrollbarPreferences
#include "nsString.h"
#include "nsAutoPtr.h"

// Threshold value in ms for META refresh based redirects
#define REFRESH_REDIRECT_TIMER 15000

// Interfaces Needed
#include "nsIDocumentCharsetInfo.h"
#include "nsIDocCharset.h"
#include "nsIGlobalHistory2.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIPrompt.h"
#include "nsIRefreshURI.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptGlobalObjectOwner.h"
#include "nsISHistory.h"
#include "nsILayoutHistoryState.h"
#include "nsIStringBundle.h"
#include "nsISupportsArray.h"
#include "nsIWebNavigation.h"
#include "nsIWebPageDescriptor.h"
#include "nsIWebProgressListener.h"
#include "nsISHContainer.h"
#include "nsIDocShellLoadInfo.h"
#include "nsIDocShellHistory.h"
#include "nsIURIFixup.h"
#include "nsIWebBrowserFind.h"
#include "nsIHttpChannel.h"
#include "nsDocShellTransferableHooks.h"
#include "nsIAuthPromptProvider.h"
#include "nsISecureBrowserUI.h"
#include "nsDocShellLoadTypes.h"

/* internally used ViewMode types */
enum ViewMode {
    viewNormal = 0x0,
    viewSource = 0x1
};

//*****************************************************************************
//***    nsRefreshTimer
//*****************************************************************************

class nsRefreshTimer : public nsITimerCallback
{
public:
    nsRefreshTimer();

    NS_DECL_ISUPPORTS
    NS_DECL_NSITIMERCALLBACK

    PRInt32 GetDelay() { return mDelay ;}

    nsCOMPtr<nsIDocShell> mDocShell;
    nsCOMPtr<nsIURI>      mURI;
    PRInt32               mDelay;
    PRPackedBool          mRepeat;
    PRPackedBool          mMetaRefresh;
    
protected:
    virtual ~nsRefreshTimer();
};

//*****************************************************************************
//***    nsDocShell
//*****************************************************************************

class nsDocShell : public nsDocLoader,
                   public nsIDocShell,
                   public nsIDocShell_MOZILLA_1_8_BRANCH,
                   public nsIDocShell_MOZILLA_1_8_BRANCH2,
                   public nsIDocShell_MOZILLA_1_8_BRANCH3,
                   public nsIDocShellTreeItem, 
                   public nsIDocShellTreeNode,
                   public nsIDocShellHistory,
                   public nsIWebNavigation,
                   public nsIBaseWindow, 
                   public nsIScrollable, 
                   public nsITextScroll, 
                   public nsIDocCharset, 
                   public nsIContentViewerContainer,
                   public nsIScriptGlobalObjectOwner,
                   public nsIRefreshURI,
                   public nsIWebProgressListener,
                   public nsIEditorDocShell,
                   public nsIWebPageDescriptor,
                   public nsIAuthPromptProvider
{
friend class nsDSURIContentListener;

public:
    // Object Management
    nsDocShell();

    virtual nsresult Init();

    NS_DECL_ISUPPORTS_INHERITED

    NS_DECL_NSIDOCSHELL
    NS_DECL_NSIDOCSHELL_MOZILLA_1_8_BRANCH
    NS_DECL_NSIDOCSHELL_MOZILLA_1_8_BRANCH2
    NS_DECL_NSIDOCSHELL_MOZILLA_1_8_BRANCH3
    NS_DECL_NSIDOCSHELLTREEITEM
    NS_DECL_NSIDOCSHELLTREENODE
    NS_DECL_NSIDOCSHELLHISTORY
    NS_DECL_NSIWEBNAVIGATION
    NS_DECL_NSIBASEWINDOW
    NS_DECL_NSISCROLLABLE
    NS_DECL_NSITEXTSCROLL
    NS_DECL_NSIDOCCHARSET
    NS_DECL_NSIINTERFACEREQUESTOR
    NS_DECL_NSIWEBPROGRESSLISTENER
    NS_DECL_NSIREFRESHURI
    NS_DECL_NSICONTENTVIEWERCONTAINER
    NS_DECL_NSIEDITORDOCSHELL
    NS_DECL_NSIWEBPAGEDESCRIPTOR
    NS_DECL_NSIAUTHPROMPTPROVIDER

    NS_IMETHOD Stop() {
        // Need this here because otherwise nsIWebNavigation::Stop
        // overrides the docloader's Stop()
        return nsDocLoader::Stop();
    }

    // Need to implement (and forward) nsISecurityEventSink, because
    // nsIWebProgressListener has methods with identical names...
    NS_FORWARD_NSISECURITYEVENTSINK(nsDocLoader::)

    nsDocShellInfoLoadType ConvertLoadTypeToDocShellLoadInfo(PRUint32 aLoadType);
    PRUint32 ConvertDocShellLoadInfoToLoadType(nsDocShellInfoLoadType aDocShellLoadType);

    // nsIScriptGlobalObjectOwner methods
    virtual nsIScriptGlobalObject* GetScriptGlobalObject();

    // Restores a cached presentation from history (mLSHE).
    // This method swaps out the content viewer and simulates loads for
    // subframes.  It then simulates the completion of the toplevel load.
    nsresult RestoreFromHistory();

protected:
    // Object Management
    virtual ~nsDocShell();
    virtual void DestroyChildren();

    // Content Viewer Management
    NS_IMETHOD EnsureContentViewer();
    NS_IMETHOD EnsureDeviceContext();
    nsresult CreateAboutBlankContentViewer();
    NS_IMETHOD CreateContentViewer(const char * aContentType, 
        nsIRequest * request, nsIStreamListener ** aContentHandler);
    NS_IMETHOD NewContentViewerObj(const char * aContentType, 
        nsIRequest * request, nsILoadGroup * aLoadGroup, 
        nsIStreamListener ** aContentHandler, nsIContentViewer ** aViewer);
    NS_IMETHOD SetupNewViewer(nsIContentViewer * aNewViewer);

    void SetupReferrerFromChannel(nsIChannel * aChannel);
    
    NS_IMETHOD GetEldestPresContext(nsPresContext** aPresContext);

    // Get the principal that we'll set on the channel if we're inheriting.  If
    // aConsiderCurrentDocument is true, we try to use the current document if
    // at all possible.  If that fails, we fall back on the parent document.
    // If that fails too, we force creation of a content viewer and use the
    // resulting principal.  If aConsiderCurrentDocument is false, we just look
    // at the parent.
    nsIPrincipal* GetInheritedPrincipal(PRBool aConsiderCurrentDocument);

    // Actually open a channel and perform a URI load.  Note: whatever owner is
    // passed to this function will be set on the channel.  Callers who wish to
    // not have an owner on the channel should just pass null.
    virtual nsresult DoURILoad(nsIURI * aURI,
                               nsIURI * aReferrer,
                               PRBool aSendReferrer,
                               nsISupports * aOwner,
                               const char * aTypeHint,
                               nsIInputStream * aPostData,
                               nsIInputStream * aHeadersData,
                               PRBool firstParty,
                               nsIDocShell ** aDocShell,
                               nsIRequest ** aRequest,
                               PRBool aIsNewWindowTarget);
    NS_IMETHOD AddHeadersToChannel(nsIInputStream * aHeadersData, 
                                  nsIChannel * aChannel);
    virtual nsresult DoChannelLoad(nsIChannel * aChannel,
                                   nsIURILoader * aURILoader);
    NS_IMETHOD ScrollIfAnchor(nsIURI * aURI, PRBool * aWasAnchor,
                              PRUint32 aLoadType, nscoord *cx, nscoord *cy);

    // Returns PR_TRUE if would have called FireOnLocationChange,
    // but did not because aFireOnLocationChange was false on entry.
    // In this case it is the caller's responsibility to ensure
    // FireOnLocationChange is called.
    // In all other cases PR_FALSE is returned.
    PRBool OnLoadingSite(nsIChannel * aChannel,
                         PRBool aFireOnLocationChange,
                         PRBool aAddToGlobalHistory = PR_TRUE);

    // Returns PR_TRUE if would have called FireOnLocationChange,
    // but did not because aFireOnLocationChange was false on entry.
    // In this case it is the caller's responsibility to ensure
    // FireOnLocationChange is called.
    // In all other cases PR_FALSE is returned.
    PRBool OnNewURI(nsIURI * aURI, nsIChannel * aChannel, PRUint32 aLoadType,
                    PRBool aFireOnLocationChange,
                    PRBool aAddToGlobalHistory = PR_TRUE);

    virtual void SetReferrerURI(nsIURI * aURI);

    // Session History
    virtual PRBool ShouldAddToSessionHistory(nsIURI * aURI);
    virtual nsresult AddToSessionHistory(nsIURI * aURI, nsIChannel * aChannel,
        nsISHEntry ** aNewEntry);
    nsresult DoAddChildSHEntry(nsISHEntry* aNewEntry, PRInt32 aChildOffset);

    NS_IMETHOD LoadHistoryEntry(nsISHEntry * aEntry, PRUint32 aLoadType);
    NS_IMETHOD PersistLayoutHistoryState();

    // Clone a session history tree for subframe navigation.
    // The tree rooted at |aSrcEntry| will be cloned into |aDestEntry|, except
    // for the entry with id |aCloneID|, which will be replaced with
    // |aReplaceEntry|.  |aSrcShell| is a (possibly null) docshell which
    // corresponds to |aSrcEntry| via its mLSHE or mOHE pointers, and will
    // have that pointer updated to point to the cloned history entry.
    static nsresult CloneAndReplace(nsISHEntry *aSrcEntry,
                                    nsDocShell *aSrcShell,
                                    PRUint32 aCloneID,
                                    nsISHEntry *aReplaceEntry,
                                    nsISHEntry **aDestEntry);

    // Child-walking callback for CloneAndReplace
    static nsresult CloneAndReplaceChild(nsISHEntry *aEntry,
                                         nsDocShell *aShell,
                                         PRInt32 aChildIndex, void *aData);

    nsresult GetRootSessionHistory(nsISHistory ** aReturn);
    nsresult GetHttpChannel(nsIChannel * aChannel, nsIHttpChannel ** aReturn);
    PRBool ShouldDiscardLayoutState(nsIHttpChannel * aChannel);

    // Determine whether this docshell corresponds to the given history entry,
    // via having a pointer to it in mOSHE or mLSHE.
    PRBool HasHistoryEntry(nsISHEntry *aEntry) const
    {
        return aEntry && (aEntry == mOSHE || aEntry == mLSHE);
    }

    // Update any pointers (mOSHE or mLSHE) to aOldEntry to point to aNewEntry
    void SwapHistoryEntries(nsISHEntry *aOldEntry, nsISHEntry *aNewEntry);

    // Call this method to swap in a new history entry to m[OL]SHE, rather than
    // setting it directly.  This completes the navigation in all docshells
    // in the case of a subframe navigation.
    void SetHistoryEntry(nsCOMPtr<nsISHEntry> *aPtr, nsISHEntry *aEntry);

    // Child-walking callback for SetHistoryEntry
    static nsresult SetChildHistoryEntry(nsISHEntry *aEntry,
                                         nsDocShell *aShell,
                                         PRInt32 aEntryIndex, void *aData);

    // Callback prototype for WalkHistoryEntries.
    // aEntry is the child history entry, aShell is its corresponding docshell,
    // aChildIndex is the child's index in its parent entry, and aData is
    // the opaque pointer passed to WalkHistoryEntries.
    typedef nsresult (*WalkHistoryEntriesFunc)(nsISHEntry *aEntry,
                                               nsDocShell *aShell,
                                               PRInt32 aChildIndex,
                                               void *aData);

    // For each child of aRootEntry, find the corresponding docshell which is
    // a child of aRootShell, and call aCallback.  The opaque pointer aData
    // is passed to the callback.
    static nsresult WalkHistoryEntries(nsISHEntry *aRootEntry,
                                       nsDocShell *aRootShell,
                                       WalkHistoryEntriesFunc aCallback,
                                       void *aData);

    // overridden from nsDocLoader, this provides more information than the
    // normal OnStateChange with flags STATE_REDIRECTING
    virtual void OnRedirectStateChange(nsIChannel* aOldChannel,
                                       nsIChannel* aNewChannel,
                                       PRUint32 aRedirectFlags,
                                       PRUint32 aStateFlags);

    // Global History
    nsresult AddToGlobalHistory(nsIURI * aURI, PRBool aRedirect,
                                nsIChannel * aChannel);

    // Helper Routines
    NS_IMETHOD GetPromptAndStringBundle(nsIPrompt ** aPrompt,
        nsIStringBundle ** aStringBundle);
    NS_IMETHOD GetChildOffset(nsIDOMNode * aChild, nsIDOMNode * aParent,
        PRInt32 * aOffset);
    NS_IMETHOD GetRootScrollableView(nsIScrollableView ** aOutScrollView);
    NS_IMETHOD EnsureScriptEnvironment();
    NS_IMETHOD EnsureEditorData();
    nsresult   EnsureTransferableHookData();
    NS_IMETHOD EnsureFind();
    nsresult   RefreshURIFromQueue();
    NS_IMETHOD DisplayLoadError(nsresult aError, nsIURI *aURI,
                                const PRUnichar *aURL,
                                nsIChannel* aFailedChannel = nsnull);
    NS_IMETHOD LoadErrorPage(nsIURI *aURI, const PRUnichar *aURL,
                             const PRUnichar *aPage,
                             const PRUnichar *aDescription,
                             nsIChannel* aFailedChannel);
    PRBool IsNavigationAllowed(PRBool aDisplayPrintErrorDialog = PR_TRUE);
    PRBool IsPrintingOrPP(PRBool aDisplayErrorDialog = PR_TRUE);

    nsresult SetBaseUrlForWyciwyg(nsIContentViewer * aContentViewer);

    static  inline  PRUint32
    PRTimeToSeconds(PRTime t_usec)
    {
      PRTime usec_per_sec;
      PRUint32 t_sec;
      LL_I2L(usec_per_sec, PR_USEC_PER_SEC);
      LL_DIV(t_usec, t_usec, usec_per_sec);
      LL_L2I(t_sec, t_usec);
      return t_sec;
    }

    PRBool IsFrame();

    //
    // Helper method that is called when a new document (including any
    // sub-documents - ie. frames) has been completely loaded.
    //
    virtual nsresult EndPageLoad(nsIWebProgress * aProgress,
                                 nsIChannel * aChannel,
                                 nsresult aResult);

    nsresult CheckLoadingPermissions();

    // Security checks to prevent frameset spoofing.  See comments at
    // implementation sites.
    static PRBool CanAccessItem(nsIDocShellTreeItem* aTargetItem,
                                nsIDocShellTreeItem* aAccessingItem,
                                PRBool aConsiderOpener = PR_TRUE);
    static PRBool ValidateOrigin(nsIDocShellTreeItem* aOriginTreeItem,
                                 nsIDocShellTreeItem* aTargetTreeItem);

    // Returns PR_TRUE if would have called FireOnLocationChange,
    // but did not because aFireOnLocationChange was false on entry.
    // In this case it is the caller's responsibility to ensure
    // FireOnLocationChange is called.
    // In all other cases PR_FALSE is returned.
    PRBool SetCurrentURI(nsIURI *aURI, nsIRequest *aRequest,
                         PRBool aFireOnLocationChange);

    // The following methods deal with saving and restoring content viewers
    // in session history.

    // mContentViewer points to the current content viewer associated with
    // this docshell.  When loading a new document, the content viewer is
    // either destroyed or stored into a session history entry.  To make sure
    // that destruction happens in a controlled fashion, a given content viewer
    // is always owned in exactly one of these ways:
    //   1) The content viewer is active and owned by a docshell's
    //      mContentViewer.
    //   2) The content viewer is still being displayed while we begin loading
    //      a new document.  The content viewer is owned by the _new_
    //      content viewer's mPreviousViewer, and has a pointer to the
    //      nsISHEntry where it will eventually be stored.  The content viewer
    //      has been close()d by the docshell, which detaches the document from
    //      the window object.
    //   3) The content viewer is cached in session history.  The nsISHEntry
    //      has the only owning reference to the content viewer.  The viewer
    //      has released its nsISHEntry pointer to prevent circular ownership.
    //
    // When restoring a content viewer from session history, open() is called
    // to reattach the document to the window object.  The content viewer is
    // then placed into mContentViewer and removed from the history entry.
    // (mContentViewer is put into session history as described above, if
    // applicable).

    // Determines whether we can safely cache the current mContentViewer in
    // session history.  This checks a number of factors such as cache policy,
    // pending requests, and unload handlers.
    // |aLoadType| should be the load type that will replace the current
    // presentation.  |aNewRequest| should be the request for the document to
    // be loaded in place of the current document, or null if such a request
    // has not been created yet. |aNewDocument| should be the document that will
    // replace the current document.
    PRBool CanSavePresentation(PRUint32 aLoadType,
                               nsIRequest *aNewRequest,
                               nsIDocument *aNewDocument);

    // Captures the state of the supporting elements of the presentation
    // (the "window" object, docshell tree, meta-refresh loads, and security
    // state) and stores them on |mOSHE|.
    nsresult CaptureState();

    // Begin the toplevel restore process for |aSHEntry|.
    // This simulates a channel open, and defers the real work until
    // RestoreFromHistory is called from a PLEvent.
    nsresult RestorePresentation(nsISHEntry *aSHEntry, PRBool *aRestoring);

    // Call BeginRestore(nsnull, PR_FALSE) for each child of this shell.
    nsresult BeginRestoreChildren();

    // Check whether aURI is about:blank
    static PRBool IsAboutBlank(nsIURI* aURI);

protected:
    // Override the parent setter from nsDocLoader
    virtual nsresult SetDocLoaderParent(nsDocLoader * aLoader);

    PRPackedBool               mAllowSubframes;
    PRPackedBool               mAllowPlugins;
    PRPackedBool               mAllowJavascript;
    PRPackedBool               mAllowMetaRedirects;
    PRPackedBool               mAllowImages;
    PRPackedBool               mFocusDocFirst;
    PRPackedBool               mHasFocus;
    PRPackedBool               mCreatingDocument; // (should be) debugging only
    PRPackedBool               mUseErrorPages;
    PRPackedBool               mAllowAuth;
    PRPackedBool               mAllowKeywordFixup;

    PRPackedBool               mFiredUnloadEvent;

    // this flag is for bug #21358. a docshell may load many urls
    // which don't result in new documents being created (i.e. a new
    // content viewer) we want to make sure we don't call a on load
    // event more than once for a given content viewer.
    PRPackedBool               mEODForCurrentDocument; 
    PRPackedBool               mURIResultedInDocument;

    PRPackedBool               mIsBeingDestroyed;

    PRPackedBool               mIsExecutingOnLoadHandler;

    // Indicates that a DocShell in this "docshell tree" is printing
    PRPackedBool               mIsPrintingOrPP;

    // Indicates to CreateContentViewer() that it is safe to cache the old
    // presentation of the page, and to SetupNewViewer() that the old viewer
    // should be passed a SHEntry to save itself into.
    PRPackedBool               mSavingOldViewer;

    PRUint32                   mAppType;

    // Offset in the parent's child list.
    PRInt32                    mChildOffset;

    PRUint32                   mBusyFlags;

    PRInt32                    mMarginWidth;
    PRInt32                    mMarginHeight;
    PRInt32                    mItemType;

    PRUint32                   mLoadType;

    nsString                   mName;
    nsString                   mTitle;
    /**
     * Content-Type Hint of the most-recently initiated load. Used for
     * session history entries.
     */
    nsCString                  mContentTypeHint;
    nsCOMPtr<nsISupportsArray> mRefreshURIList;
    nsCOMPtr<nsISupportsArray> mSavedRefreshURIList;
    nsRefPtr<nsDSURIContentListener> mContentListener;
    nsRect                     mBounds; // Dimensions of the docshell
    nsCOMPtr<nsIContentViewer> mContentViewer;
    nsCOMPtr<nsIDocumentCharsetInfo> mDocumentCharsetInfo;
    nsCOMPtr<nsIDeviceContext> mDeviceContext;
    nsCOMPtr<nsIWidget>        mParentWidget;
    nsCOMPtr<nsIPrefBranch>    mPrefs;
    nsCOMPtr<nsIURI>           mCurrentURI;
    nsCOMPtr<nsIURI>           mReferrerURI;
    nsCOMPtr<nsIScriptGlobalObject> mScriptGlobal;
    nsCOMPtr<nsISHistory>      mSessionHistory;
    nsCOMPtr<nsIGlobalHistory2> mGlobalHistory;
    nsCOMPtr<nsIWebBrowserFind> mFind;
    nsPoint                    mDefaultScrollbarPref; // persistent across doc loads
    // Reference to the SHEntry for this docshell until the page is destroyed.
    // Somebody give me better name
    nsCOMPtr<nsISHEntry>       mOSHE; 
    // Reference to the SHEntry for this docshell until the page is loaded
    // Somebody give me better name
    nsCOMPtr<nsISHEntry>       mLSHE;

    // hash of session storages, keyed by domain
    nsInterfaceHashtable<nsCStringHashKey, nsIDOMStorage> mStorages;

    // Index into the SHTransaction list, indicating the previous and current
    // transaction at the time that this DocShell begins to load
    PRInt32                    mPreviousTransIndex;
    PRInt32                    mLoadedTransIndex;

    // Editor stuff
    nsDocShellEditorData*      mEditorData;          // editor data, if any

    // Transferable hooks/callbacks
    nsCOMPtr<nsIClipboardDragDropHookList>  mTransferableHookData;

    // Secure browser UI object
    nsCOMPtr<nsISecureBrowserUI> mSecurityUI;

    // WEAK REFERENCES BELOW HERE.
    // Note these are intentionally not addrefd.  Doing so will create a cycle.
    // For that reasons don't use nsCOMPtr.

    nsIDocShellTreeOwner *     mTreeOwner; // Weak Reference
    nsIChromeEventHandler *    mChromeEventHandler; //Weak Reference

    static nsIURIFixup *sURIFixup;


public:
    class InterfaceRequestorProxy : public nsIInterfaceRequestor {
    public:
        InterfaceRequestorProxy(nsIInterfaceRequestor* p);
        virtual ~InterfaceRequestorProxy();
        NS_DECL_ISUPPORTS
        NS_DECL_NSIINTERFACEREQUESTOR
 
    protected:
        InterfaceRequestorProxy() {}
        nsWeakPtr mWeakPtr;
    };
};

#endif /* nsDocShell_h__ */