/*

    Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)

    Copyright (C) 2001 Dirk Mueller <mueller@kde.org>

    Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License

    along with this library; see the file COPYING.LIB.  If not, write to

    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    Boston, MA 02110-1301, USA.

    This class provides all functionality needed for loading images, style sheets and html

    pages from the web. It has a memory cache for these objects.

*/

#ifndef DocLoader_h

#define DocLoader_h

#include "CachedResource.h"

#include "CachePolicy.h"

#include "StringHash.h"

#include <wtf/HashMap.h>

#include <wtf/HashSet.h>

#if PRELOAD_SCANNER_ENABLED

#include <wtf/ListHashSet.h>

#endif

namespace WebCore {

class CachedCSSStyleSheet;

class CachedImage;

class CachedScript;

class CachedXSLStyleSheet;

class Document;

class Frame;

class HTMLImageLoader;

class KURL;

// The DocLoader manages the loading of scripts/images/stylesheets for a single document.

class DocLoader

{

friend class Cache;

friend class HTMLImageLoader;

public:

    DocLoader(Frame*, Document*);

    ~DocLoader();

    CachedImage* requestImage(const String& url);

    CachedCSSStyleSheet* requestUserCSSStyleSheet(const String& url, const String& charset);

    CachedScript* requestScript(const String& url, const String& charset);

#if ENABLE(XSLT)

    CachedXSLStyleSheet* requestXSLStyleSheet(const String& url);

#endif

#if ENABLE(XBL)

    CachedXBLDocument* requestXBLDocument(const String &url);

#endif

    CachedResource* cachedResource(const String& url) const { return m_docResources.get(url); }

    const HashMap<String, CachedResource*>& allCachedResources() const { return m_docResources; }

    bool autoLoadImages() const { return m_autoLoadImages; }

    void setAutoLoadImages(bool);

    CachePolicy cachePolicy() const { return m_cachePolicy; }

    void setCachePolicy(CachePolicy);

    Frame* frame() const { return m_frame; }

    Document* doc() const { return m_doc; }

    void removeCachedResource(CachedResource*) const;

    void setLoadInProgress(bool);

    bool loadInProgress() const { return m_loadInProgress; }

    void setAllowStaleResources(bool allowStaleResources) { m_allowStaleResources = allowStaleResources; }

#if USE(LOW_BANDWIDTH_DISPLAY)

    void replaceDocument(Document* doc) { m_doc = doc; }

#endif

    void incrementRequestCount();

    void decrementRequestCount();

    int requestCount();

#if PRELOAD_SCANNER_ENABLED

    void clearPreloads();

    void preload(CachedResource::Type type, const String& url);

    void printPreloadStats();

#endif

private:

#if PRELOAD_SCANNER_ENABLED

#else

#endif

    void checkForReload(const KURL&);

    void checkCacheObjectStatus(CachedResource*);

    Cache* m_cache;

    HashSet<String> m_reloadedURLs;

    mutable HashMap<String, CachedResource*> m_docResources;

    CachePolicy m_cachePolicy;

    Frame* m_frame;

    Document *m_doc;

    int m_requestCount;

#if PRELOAD_SCANNER_ENABLED

	ListHashSet<CachedResource*> m_preloads;

#endif            

    //29 bits left

    bool m_autoLoadImages : 1;

    bool m_loadInProgress : 1;

    bool m_allowStaleResources : 1;

};

}

#endif