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 * The Original Code is mozilla.org code.
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#ifndef _nsContentSink_h_
#define _nsContentSink_h_

// Base class for contentsink implementations.

#include "nsICSSLoaderObserver.h"
#include "nsIScriptLoaderObserver.h"
#include "nsWeakReference.h"
#include "nsCOMPtr.h"
#include "nsCOMArray.h"
#include "nsString.h"

class nsIDocument;
class nsIURI;
class nsIChannel;
class nsIDocShell;
class nsICSSLoader;
class nsINodeInfoManager;
class nsIParser;
class nsIAtom;
class nsIChannel;
class nsIContent;
class nsIViewManager;

class nsContentSink : public nsICSSLoaderObserver,
                      public nsIScriptLoaderObserver,
                      public nsSupportsWeakReference
{
  NS_DECL_ISUPPORTS
  NS_DECL_NSISCRIPTLOADEROBSERVER
  
  // nsICSSLoaderObserver
  NS_IMETHOD StyleSheetLoaded(nsICSSStyleSheet* aSheet, PRBool aNotify);

protected:
  nsContentSink();
  virtual ~nsContentSink();

  nsresult Init(nsIDocument* aDoc, nsIURI* aURI,
                nsISupports* aContainer, nsIChannel* aChannel);

  nsresult ProcessHTTPHeaders(nsIChannel* aChannel);
  nsresult ProcessHeaderData(nsIAtom* aHeader, const nsAString& aValue,
                             nsIContent* aContent = nsnull);
  nsresult ProcessLinkHeader(nsIContent* aElement,
                             const nsAString& aLinkData);
  nsresult ProcessLink(nsIContent* aElement, const nsAString& aHref,
                       const nsAString& aRel, const nsAString& aTitle,
                       const nsAString& aType, const nsAString& aMedia);

  virtual nsresult ProcessStyleLink(nsIContent* aElement,
                                    const nsAString& aHref,
                                    PRBool aAlternate,
                                    const nsAString& aTitle,
                                    const nsAString& aType,
                                    const nsAString& aMedia);

  nsresult ProcessMETATag(nsIContent* aContent);

  void PrefetchHref(const nsAString &aHref, PRBool aExplicit);

  PRBool ScrollToRef(PRBool aReallyScroll);
  nsresult RefreshIfEnabled(nsIViewManager* vm);
  void StartLayout(PRBool aIsFrameset);

  // Overridable hooks into script evaluation
  virtual void PreEvaluateScript()  {return;}
  virtual void PostEvaluateScript() {return;}

  nsCOMPtr<nsIDocument>         mDocument;
  nsCOMPtr<nsIParser>           mParser;
  nsCOMPtr<nsIURI>              mDocumentURI;
  nsCOMPtr<nsIURI>              mDocumentBaseURI;
  nsCOMPtr<nsIDocShell>         mDocShell;
  nsCOMPtr<nsICSSLoader>        mCSSLoader;
  nsCOMPtr<nsINodeInfoManager>  mNodeInfoManager;

  nsCOMArray<nsIDOMHTMLScriptElement> mScriptElements;

  nsCString mRef; // ScrollTo #ref
  PRBool mNeedToBlockParser;
};

#endif // _nsContentSink_h_