Refactoring: Generalize CachedSVGDocument for non-SVG use.

Source/core/loader/cache/CachedDocument.cpp

 /*
     Copyright (C) 2010 Rob Buis <rwlbuis@gmail.com>
     Copyright (C) 2011 Cosmin Truta <ctruta@gmail.com>
     Copyright (C) 2012 University of Szeged
     Copyright (C) 2012 Renata Hodovan <reni@webkit.org>
 
     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.
 */
 
 #include "config.h"
 
-#include "core/loader/cache/CachedSVGDocument.h"
+#include "core/loader/cache/CachedDocument.h"
 
 #include "core/loader/cache/CachedResourceClient.h"
 #include "core/loader/cache/CachedResourceHandle.h"
 #include "core/platform/SharedBuffer.h"
-#include <wtf/text/StringBuilder.h>
+#include "core/svg/SVGDocument.h"
+#include "wtf/text/StringBuilder.h"
 
 namespace WebCore {
 
-CachedSVGDocument::CachedSVGDocument(const ResourceRequest& request)
-    : CachedResource(request, SVGDocumentResource)
+CachedDocument::CachedDocument(const ResourceRequest& request, Type type)
+    : CachedResource(request, type)
     , m_decoder(TextResourceDecoder::create("application/xml"))
 {
-    setAccept("image/svg+xml");
+    // FIXME: We'll support more types to support HTMLImports.
+    ASSERT(type == SVGDocumentResource);
 }
 
-CachedSVGDocument::~CachedSVGDocument()
+CachedDocument::~CachedDocument()
 {
 }
 
-void CachedSVGDocument::setEncoding(const String& chs)
+void CachedDocument::setEncoding(const String& chs)
 {
     m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
 }
 
-String CachedSVGDocument::encoding() const
+String CachedDocument::encoding() const
 {
     return m_decoder->encoding().name();
 }
 
-void CachedSVGDocument::checkNotify()
+void CachedDocument::checkNotify()
 {
     if (m_data) {
         StringBuilder decodedText;
         decodedText.append(m_decoder->decode(m_data->data(), m_data->size()));
         decodedText.append(m_decoder->flush());
         // We don't need to create a new frame because the new document belongs to the parent UseElement.
-        m_document = SVGDocument::create(0, response().url());
+        m_document = createDocument(response().url());
         m_document->setContent(decodedText.toString());
     }
     CachedResource::checkNotify();
 }
 
-void CachedSVGDocument::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
+PassRefPtr<Document> CachedDocument::createDocument(const KURL& url)
+{
+    switch (type()) {
+    case SVGDocumentResource:
+        return SVGDocument::create(0, url);
+    default:
+        // FIXME: We'll add more types to support HTMLImports.
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
+}
+
+void CachedDocument::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CachedResourceSVG);
     CachedResource::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_document, "document");
     info.addMember(m_decoder, "decoder");
 }
 
 }