Move Resource subclasses out of fetch/

Source/core/fetch/CSSStyleSheetResource.cpp

-/*
-    Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
-    Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
-    Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
-    Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
-    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.
-*/
-
-#include "config.h"
-#include "core/fetch/CSSStyleSheetResource.h"
-
-#include "core/css/StyleSheetContents.h"
-#include "core/fetch/FetchRequest.h"
-#include "core/fetch/ResourceClientWalker.h"
-#include "core/fetch/ResourceFetcher.h"
-#include "core/fetch/StyleSheetResourceClient.h"
-#include "platform/SharedBuffer.h"
-#include "platform/network/HTTPParsers.h"
-#include "wtf/CurrentTime.h"
-
-namespace blink {
-
-ResourcePtr<CSSStyleSheetResource> CSSStyleSheetResource::fetch(FetchRequest& request, ResourceFetcher* fetcher)
-{
-    ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
-    request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextStyle);
-    return toCSSStyleSheetResource(fetcher->requestResource(request, CSSStyleSheetResourceFactory()));
-}
-
-CSSStyleSheetResource::CSSStyleSheetResource(const ResourceRequest& resourceRequest, const String& charset)
-    : StyleSheetResource(resourceRequest, CSSStyleSheet, "text/css", charset)
-{
-    DEFINE_STATIC_LOCAL(const AtomicString, acceptCSS, ("text/css,*/*;q=0.1", AtomicString::ConstructFromLiteral));
-
-    // Prefer text/css but accept any type (dell.com serves a stylesheet
-    // as text/html; see <http://bugs.webkit.org/show_bug.cgi?id=11451>).
-    setAccept(acceptCSS);
-}
-
-CSSStyleSheetResource::~CSSStyleSheetResource()
-{
-    // Make sure dispose() was cllaed before destruction.
-    ASSERT(!m_parsedStyleSheetCache);
-}
-
-void CSSStyleSheetResource::dispose()
-{
-    if (m_parsedStyleSheetCache)
-        m_parsedStyleSheetCache->removedFromMemoryCache();
-    m_parsedStyleSheetCache.clear();
-}
-
-DEFINE_TRACE(CSSStyleSheetResource)
-{
-    visitor->trace(m_parsedStyleSheetCache);
-    StyleSheetResource::trace(visitor);
-}
-
-void CSSStyleSheetResource::didAddClient(ResourceClient* c)
-{
-    ASSERT(c->resourceClientType() == StyleSheetResourceClient::expectedType());
-    // Resource::didAddClient() must be before setCSSStyleSheet(),
-    // because setCSSStyleSheet() may cause scripts to be executed, which could destroy 'c' if it is an instance of HTMLLinkElement.
-    // see the comment of HTMLLinkElement::setCSSStyleSheet.
-    Resource::didAddClient(c);
-
-    if (!isLoading())
-        static_cast<StyleSheetResourceClient*>(c)->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), encoding(), this);
-}
-
-const String CSSStyleSheetResource::sheetText(MIMETypeCheck mimeTypeCheck) const
-{
-    ASSERT(!isPurgeable());
-
-    if (!m_data || m_data->isEmpty() || !canUseSheet(mimeTypeCheck))
-        return String();
-
-    if (!m_decodedSheetText.isNull())
-        return m_decodedSheetText;
-
-    // Don't cache the decoded text, regenerating is cheap and it can use quite a bit of memory
-    return decodedText();
-}
-
-const AtomicString CSSStyleSheetResource::mimeType() const
-{
-    return extractMIMETypeFromMediaType(response().httpHeaderField("Content-Type")).lower();
-}
-
-void CSSStyleSheetResource::checkNotify()
-{
-    // Decode the data to find out the encoding and keep the sheet text around during checkNotify()
-    if (m_data)
-        m_decodedSheetText = decodedText();
-
-    ResourceClientWalker<StyleSheetResourceClient> w(m_clients);
-    while (StyleSheetResourceClient* c = w.next())
-        c->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), encoding(), this);
-    // Clear the decoded text as it is unlikely to be needed immediately again and is cheap to regenerate.
-    m_decodedSheetText = String();
-}
-
-bool CSSStyleSheetResource::isSafeToUnlock() const
-{
-    return m_data->hasOneRef();
-}
-
-void CSSStyleSheetResource::destroyDecodedDataIfPossible()
-{
-    if (!m_parsedStyleSheetCache)
-        return;
-
-    m_parsedStyleSheetCache->removedFromMemoryCache();
-    m_parsedStyleSheetCache.clear();
-
-    setDecodedSize(0);
-}
-
-bool CSSStyleSheetResource::canUseSheet(MIMETypeCheck mimeTypeCheck) const
-{
-    if (errorOccurred())
-        return false;
-
-    // This check exactly matches Firefox. Note that we grab the Content-Type
-    // header directly because we want to see what the value is BEFORE content
-    // sniffing. Firefox does this by setting a "type hint" on the channel.
-    // This implementation should be observationally equivalent.
-    //
-    // This code defaults to allowing the stylesheet for non-HTTP protocols so
-    // folks can use standards mode for local HTML documents.
-    if (mimeTypeCheck == MIMETypeCheck::Lax)
-        return true;
-    return mimeType().isEmpty() || equalIgnoringCase(mimeType(), "text/css") || equalIgnoringCase(mimeType(), "application/x-unknown-content-type");
-}
-
-PassRefPtrWillBeRawPtr<StyleSheetContents> CSSStyleSheetResource::restoreParsedStyleSheet(const CSSParserContext& context)
-{
-    if (!m_parsedStyleSheetCache)
-        return nullptr;
-    if (m_parsedStyleSheetCache->hasFailedOrCanceledSubresources()) {
-        m_parsedStyleSheetCache->removedFromMemoryCache();
-        m_parsedStyleSheetCache.clear();
-        return nullptr;
-    }
-
-    ASSERT(m_parsedStyleSheetCache->isCacheable());
-    ASSERT(m_parsedStyleSheetCache->isInMemoryCache());
-
-    // Contexts must be identical so we know we would get the same exact result if we parsed again.
-    if (m_parsedStyleSheetCache->parserContext() != context)
-        return nullptr;
-
-    didAccessDecodedData();
-
-    return m_parsedStyleSheetCache;
-}
-
-void CSSStyleSheetResource::saveParsedStyleSheet(PassRefPtrWillBeRawPtr<StyleSheetContents> sheet)
-{
-    ASSERT(sheet && sheet->isCacheable());
-
-    if (m_parsedStyleSheetCache)
-        m_parsedStyleSheetCache->removedFromMemoryCache();
-    m_parsedStyleSheetCache = sheet;
-    m_parsedStyleSheetCache->addedToMemoryCache();
-
-    setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());
-}
-
-}