1 /* 2 Copyright (C) 1998 Lars Knoll (knoll (at) mpi-hd.mpg.de) 3 Copyright (C) 2001 Dirk Mueller <mueller (at) kde.org> 4 Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. 5 Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/ 6 7 This library is free software; you can redistribute it and/or 8 modify it under the terms of the GNU Library General Public 9 License as published by the Free Software Foundation; either 10 version 2 of the License, or (at your option) any later version. 11 12 This library is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 Library General Public License for more details. 16 17 You should have received a copy of the GNU Library General Public License 18 along with this library; see the file COPYING.LIB. If not, write to 19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20 Boston, MA 02110-1301, USA. 21 22 This class provides all functionality needed for loading images, style sheets and html 23 pages from the web. It has a memory cache for these objects. 24 */ 25 26 #ifndef CachedResourceLoader_h 27 #define CachedResourceLoader_h 28 29 #include "CachedResource.h" 30 #include "CachedResourceHandle.h" 31 #include "CachePolicy.h" 32 #include "ResourceLoadPriority.h" 33 #include "Timer.h" 34 #include <wtf/Deque.h> 35 #include <wtf/HashMap.h> 36 #include <wtf/HashSet.h> 37 #include <wtf/ListHashSet.h> 38 #include <wtf/text/StringHash.h> 39 40 namespace WebCore { 41 42 class CachedCSSStyleSheet; 43 class CachedFont; 44 class CachedImage; 45 class CachedResourceRequest; 46 class CachedScript; 47 class CachedXSLStyleSheet; 48 class Document; 49 class Frame; 50 class ImageLoader; 51 class KURL; 52 53 // The CachedResourceLoader manages the loading of scripts/images/stylesheets for a single document. 54 class CachedResourceLoader { 55 WTF_MAKE_NONCOPYABLE(CachedResourceLoader); WTF_MAKE_FAST_ALLOCATED; 56 friend class ImageLoader; 57 58 public: 59 CachedResourceLoader(Document*); 60 ~CachedResourceLoader(); 61 62 CachedImage* requestImage(const String& url); 63 CachedCSSStyleSheet* requestCSSStyleSheet(const String& url, const String& charset, ResourceLoadPriority priority = ResourceLoadPriorityUnresolved); 64 CachedCSSStyleSheet* requestUserCSSStyleSheet(const String& url, const String& charset); 65 CachedScript* requestScript(const String& url, const String& charset); 66 CachedFont* requestFont(const String& url); 67 68 #if ENABLE(XSLT) 69 CachedXSLStyleSheet* requestXSLStyleSheet(const String& url); 70 #endif 71 #if ENABLE(LINK_PREFETCH) 72 CachedResource* requestLinkResource(const String &url, ResourceLoadPriority priority = ResourceLoadPriorityUnresolved); 73 #endif 74 75 // Logs an access denied message to the console for the specified URL. 76 void printAccessDeniedMessage(const KURL& url) const; 77 78 CachedResource* cachedResource(const String& url) const; 79 CachedResource* cachedResource(const KURL& url) const; 80 81 typedef HashMap<String, CachedResourceHandle<CachedResource> > DocumentResourceMap; 82 const DocumentResourceMap& allCachedResources() const { return m_documentResources; } 83 84 bool autoLoadImages() const { return m_autoLoadImages; } 85 void setAutoLoadImages(bool); 86 87 #ifdef ANDROID_BLOCK_NETWORK_IMAGE 88 bool blockNetworkImage() const { return m_blockNetworkImage; } 89 void setBlockNetworkImage(bool); 90 bool shouldBlockNetworkImage(const String& url) const; 91 #endif 92 93 CachePolicy cachePolicy() const; 94 95 Frame* frame() const; // Can be NULL 96 Document* document() const { return m_document; } 97 98 void removeCachedResource(CachedResource*) const; 99 100 void load(CachedResource*, bool incremental = false, SecurityCheckPolicy = DoSecurityCheck, bool sendResourceLoadCallbacks = true); 101 void loadFinishing() { m_loadFinishing = true; } 102 void loadDone(CachedResourceRequest*); 103 void cancelRequests(); 104 105 void setAllowStaleResources(bool allowStaleResources) { m_allowStaleResources = allowStaleResources; } 106 107 void incrementRequestCount(const CachedResource*); 108 void decrementRequestCount(const CachedResource*); 109 int requestCount(); 110 111 void clearPreloads(); 112 void clearPendingPreloads(); 113 void preload(CachedResource::Type, const String& url, const String& charset, bool referencedFromBody); 114 void checkForPendingPreloads(); 115 void printPreloadStats(); 116 117 private: 118 CachedResource* requestResource(CachedResource::Type, const String& url, const String& charset, ResourceLoadPriority priority = ResourceLoadPriorityUnresolved, bool isPreload = false); 119 CachedResource* revalidateResource(CachedResource*, ResourceLoadPriority priority); 120 CachedResource* loadResource(CachedResource::Type, const KURL&, const String& charset, ResourceLoadPriority priority); 121 void requestPreload(CachedResource::Type, const String& url, const String& charset); 122 123 enum RevalidationPolicy { Use, Revalidate, Reload, Load }; 124 RevalidationPolicy determineRevalidationPolicy(CachedResource::Type, bool forPreload, CachedResource* existingResource) const; 125 126 void notifyLoadedFromMemoryCache(CachedResource*); 127 bool canRequest(CachedResource::Type, const KURL&); 128 129 void loadDoneActionTimerFired(Timer<CachedResourceLoader>*); 130 131 void performPostLoadActions(); 132 133 HashSet<String> m_validatedURLs; 134 mutable DocumentResourceMap m_documentResources; 135 Document* m_document; 136 137 typedef HashSet<RefPtr<CachedResourceRequest> > RequestSet; 138 RequestSet m_requests; 139 140 int m_requestCount; 141 142 OwnPtr<ListHashSet<CachedResource*> > m_preloads; 143 struct PendingPreload { 144 CachedResource::Type m_type; 145 String m_url; 146 String m_charset; 147 }; 148 Deque<PendingPreload> m_pendingPreloads; 149 150 Timer<CachedResourceLoader> m_loadDoneActionTimer; 151 152 //29 bits left 153 bool m_autoLoadImages : 1; 154 bool m_loadFinishing : 1; 155 bool m_allowStaleResources : 1; 156 #ifdef ANDROID_BLOCK_NETWORK_IMAGE 157 bool m_blockNetworkImage : 1; 158 #endif 159 }; 160 161 } 162 163 #endif 164
