Moving XSAXDocumentBuilder2 to use XFastDocumentHandler:

This is used in parsing of meta Contexts across different
modules. This also involved moving to XFastParser for
parsing xml filters in sw, sd, starmath.

Change-Id: Ic663aaac6cb20ee8ce5b97cae87c93220f5a2929
Reviewed-on: https://gerrit.libreoffice.org/42989Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Jenkins <ci@libreoffice.org>

include/xmloff/xmlimp.hxx

@@ -55,6 +55,8 @@
 #include <xmloff/formlayerimport.hxx>
 #include <comphelper/attributelist.hxx>
 #include <sax/fastattribs.hxx>
+#include <rtl/ustring.hxx>
+#include <unordered_map>
 
 #include <com/sun/star/beans/NamedValue.hpp>
 
@@ -225,6 +227,7 @@ class XMLOFF_DLLPUBLIC SvXMLImport : public cppu::WeakImplHelper<
     css::uno::Reference< css::xml::sax::XFastDocumentHandler > mxFastDocumentHandler;
     static css::uno::Reference< css::xml::sax::XFastTokenHandler > xTokenHandler;
     static std::unordered_map< sal_Int32, std::pair< OUString, OUString > > aNamespaceMap;
+    static std::unordered_map< OUString, OUString, OUStringHash > aNamespaceURIPrefixMap;
     static bool bIsNSMapsInitialized;
 
     static void initializeNamespaceMaps();
@@ -378,6 +381,8 @@ public:
 
     static const OUString getNameFromToken( sal_Int32 nToken );
     static const OUString getNamespacePrefixFromToken( sal_Int32 nToken );
+    static const OUString getNamespaceURIFromToken( sal_Int32 nToken );
+    static const OUString getNamespacePrefixFromURI( const OUString& rURI );
 
     SvXMLNamespaceMap& GetNamespaceMap() { return *mpNamespaceMap; }
     const SvXMLNamespaceMap& GetNamespaceMap() const { return *mpNamespaceMap; }

include/xmloff/xmlmetai.hxx

@@ -40,22 +40,20 @@ private:
     css::uno::Reference< css::xml::dom::XSAXDocumentBuilder2> mxDocBuilder;
 
 public:
-    SvXMLMetaDocumentContext(SvXMLImport& rImport, sal_uInt16 nPrfx,
-        const OUString& rLName,
-        const css::uno::Reference< css::document::XDocumentProperties>& xDocProps);
-
     SvXMLMetaDocumentContext(SvXMLImport& rImport,
         const css::uno::Reference< css::document::XDocumentProperties>& xDocProps);
 
     virtual ~SvXMLMetaDocumentContext() override;
 
-    virtual SvXMLImportContextRef CreateChildContext( sal_uInt16 nPrefix,
-        const OUString& rLocalName,
-        const css::uno::Reference< css::xml::sax::XAttributeList>& xAttrList ) override;
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
+    virtual void SAL_CALL startFastElement( sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
-    virtual void StartElement( const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList ) override;
+    virtual void SAL_CALL endFastElement( sal_Int32 nElement ) override;
 
-    virtual void EndElement() override;
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
 public:
     static void setBuildId(const OUString & rGenerator,

offapi/com/sun/star/xml/dom/XSAXDocumentBuilder2.idl

@@ -20,7 +20,7 @@
 #ifndef __com_sun_star_xml_dom_XSAXDocumentBuilder2_idl
 #define __com_sun_star_xml_dom_XSAXDocumentBuilder2_idl
 
-#include <com/sun/star/xml/sax/XDocumentHandler.idl>
+#include <com/sun/star/xml/sax/XFastDocumentHandler.idl>
 #include <com/sun/star/xml/dom/XSAXDocumentBuilder.idl>
 
 module com {  module sun {  module star {  module xml { module dom {
@@ -33,7 +33,7 @@ module com {  module sun {  module star {  module xml { module dom {
 interface XSAXDocumentBuilder2
 {
     interface XSAXDocumentBuilder;
-    interface com::sun::star::xml::sax::XDocumentHandler;
+    interface com::sun::star::xml::sax::XFastDocumentHandler;
 };
 
 };};};};};

reportdesign/source/filter/xml/xmlfilter.cxx

@@ -745,10 +745,6 @@ SvXMLImportContext* ORptFilter::CreateDocumentContext( sal_uInt16 nPrefix,
         case XML_TOK_DOC_CONTENT:
             pContext = new RptXMLDocumentContentContext(*this, nPrefix, rLocalName);
             break;
-        case XML_TOK_DOC_META:
-            GetProgressBarHelper()->Increment( PROGRESS_BAR_STEP );
-            pContext = CreateMetaContext( rLocalName );
-            break;
         default:
             break;
     }
@@ -759,6 +755,23 @@ SvXMLImportContext* ORptFilter::CreateDocumentContext( sal_uInt16 nPrefix,
     return pContext;
 }
 
+SvXMLImportContext *ORptFilter::CreateFastContext( sal_Int32 nElement,
+        const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    SvXMLImportContext *pContext = nullptr;
+
+    switch (nElement)
+    {
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
+            GetProgressBarHelper()->Increment( PROGRESS_BAR_STEP );
+            pContext = CreateMetaContext( nElement );
+            break;
+        default:
+            pContext = new SvXMLImportContext(*this);
+    }
+    return pContext;
+}
+
 const SvXMLTokenMap& ORptFilter::GetDocElemTokenMap() const
 {
     if ( !m_pDocElemTokenMap.get() )
@@ -1102,14 +1115,14 @@ void ORptFilter::insertFunction(const css::uno::Reference< css::report::XFunctio
     m_aFunctions.emplace(_xFunction->getName(),_xFunction);
 }
 
-SvXMLImportContext* ORptFilter::CreateMetaContext(const OUString& rLocalName)
+SvXMLImportContext* ORptFilter::CreateMetaContext(const sal_Int32 /*nElement*/)
 {
     SvXMLImportContext* pContext = nullptr;
 
     if ( getImportFlags() & SvXMLImportFlags::META )
     {
         uno::Reference<document::XDocumentPropertiesSupplier> xDPS(GetModel(), uno::UNO_QUERY_THROW);
-        pContext = new SvXMLMetaDocumentContext(*this,XML_NAMESPACE_OFFICE, rLocalName,xDPS->getDocumentProperties());
+        pContext = new SvXMLMetaDocumentContext(*this, xDPS->getDocumentProperties());
     }
     return pContext;
 }

reportdesign/source/filter/xml/xmlfilter.hxx

@@ -99,7 +99,7 @@ public:
     using SvXMLImport::SetMasterStyles;
     SvXMLImportContext* CreateStylesContext(const OUString& rLocalName,
                                             const Reference< XAttributeList>& xAttrList, bool bIsAutoStyle );
-    SvXMLImportContext* CreateMetaContext(const OUString& rLocalName);
+    SvXMLImportContext* CreateMetaContext(const sal_Int32 nElement);
     SvXMLImportContext* CreateFontDeclsContext(const OUString& rLocalName,
             const css::uno::Reference< css::xml::sax::XAttributeList > & xAttrList );
 protected:
@@ -108,6 +108,9 @@ protected:
             const OUString& rLocalName,
             const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList ) override;
 
+    virtual SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
+
     virtual XMLShapeImportHelper* CreateShapeImport() override;
 
     virtual ~ORptFilter()  throw() override;

sc/source/filter/xml/xmlimprt.cxx

@@ -234,10 +234,6 @@ protected:
     ScXMLImport& GetScImport() { return static_cast<ScXMLImport&>(GetImport()); }
 
 public:
-    ScXMLDocContext_Impl( ScXMLImport& rImport,
-        sal_uInt16 nPrfx,
-        const OUString& rLName );
-
     ScXMLDocContext_Impl( ScXMLImport& rImport );
 
     virtual SvXMLImportContextRef CreateChildContext( sal_uInt16 nPrefix,
@@ -256,13 +252,6 @@ public:
     virtual void SAL_CALL endFastElement(sal_Int32 nElement) override;
 };
 
-ScXMLDocContext_Impl::ScXMLDocContext_Impl( ScXMLImport& rImport, sal_uInt16 nPrfx,
-                                           const OUString& rLName ) :
-SvXMLImportContext( rImport, nPrfx, rLName )
-{
-
-}
-
 ScXMLDocContext_Impl::ScXMLDocContext_Impl( ScXMLImport& rImport ) :
 SvXMLImportContext( rImport )
 {
@@ -273,37 +262,22 @@ class ScXMLFlatDocContext_Impl
     : public ScXMLDocContext_Impl, public SvXMLMetaDocumentContext
 {
 public:
-    ScXMLFlatDocContext_Impl( ScXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
-        const uno::Reference<document::XDocumentProperties>& i_xDocProps);
 
     ScXMLFlatDocContext_Impl( ScXMLImport& i_rImport,
         const uno::Reference<document::XDocumentProperties>& i_xDocProps);
 
-    virtual SvXMLImportContextRef CreateChildContext(
-        sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-        const uno::Reference<xml::sax::XAttributeList>& i_xAttrList) override;
-
     virtual void SAL_CALL startFastElement (sal_Int32 nElement,
         const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList) override;
 
     virtual void SAL_CALL endFastElement(sal_Int32 nElement) override;
 
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
     virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL
         createFastChildContext( sal_Int32 nElement,
         const css::uno::Reference<css::xml::sax::XFastAttributeList>& xAttrList ) override;
 };
 
-ScXMLFlatDocContext_Impl::ScXMLFlatDocContext_Impl( ScXMLImport& i_rImport,
-                                                   sal_uInt16 i_nPrefix, const OUString & i_rLName,
-                                                   const uno::Reference<document::XDocumentProperties>& i_xDocProps) :
-SvXMLImportContext(i_rImport, i_nPrefix, i_rLName),
-ScXMLDocContext_Impl(i_rImport, i_nPrefix, i_rLName),
-SvXMLMetaDocumentContext(i_rImport, i_nPrefix, i_rLName,
-                         i_xDocProps)
-{
-}
-
 ScXMLFlatDocContext_Impl::ScXMLFlatDocContext_Impl( ScXMLImport& i_rImport,
                                                    const uno::Reference<document::XDocumentProperties>& i_xDocProps) :
 SvXMLImportContext(i_rImport),
@@ -312,29 +286,14 @@ SvXMLMetaDocumentContext(i_rImport, i_xDocProps)
 {
 }
 
-SvXMLImportContextRef ScXMLFlatDocContext_Impl::CreateChildContext(
-    sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-    const uno::Reference<xml::sax::XAttributeList>& i_xAttrList)
-{
-    // behave like meta base class iff we encounter office:meta
-    const SvXMLTokenMap& rTokenMap = GetScImport().GetDocElemTokenMap();
-    if ( XML_TOK_DOC_META == rTokenMap.Get( i_nPrefix, i_rLocalName ) ) {
-        return SvXMLMetaDocumentContext::CreateChildContext(
-            i_nPrefix, i_rLocalName, i_xAttrList );
-    } else {
-        return ScXMLDocContext_Impl::CreateChildContext(
-            i_nPrefix, i_rLocalName, i_xAttrList );
-    }
-}
-
 uno::Reference< xml::sax::XFastContextHandler > SAL_CALL
     ScXMLFlatDocContext_Impl::createFastChildContext( sal_Int32 nElement,
     const uno::Reference< xml::sax::XFastAttributeList > & xAttrList )
 {
-    if ( nElement != XML_ELEMENT( OFFICE, XML_META ) )
-        return ScXMLDocContext_Impl::createFastChildContext( nElement, xAttrList );
+    if ( nElement == XML_ELEMENT( OFFICE, XML_META ) )
+        return SvXMLMetaDocumentContext::createFastChildContext( nElement, xAttrList );
     else
-        return new SvXMLImportContext( GetImport() );
+        return ScXMLDocContext_Impl::createFastChildContext( nElement, xAttrList );
 }
 
 void SAL_CALL ScXMLFlatDocContext_Impl::startFastElement(sal_Int32 nElement,
@@ -348,6 +307,11 @@ void SAL_CALL ScXMLFlatDocContext_Impl::endFastElement(sal_Int32 nElement)
     SvXMLMetaDocumentContext::endFastElement( nElement );
 }
 
+void SAL_CALL ScXMLFlatDocContext_Impl::characters(const OUString& rChars)
+{
+    SvXMLMetaDocumentContext::characters(rChars);
+}
+
 class ScXMLBodyContext_Impl : public ScXMLImportContext
 {
 public:
@@ -659,29 +623,6 @@ sc::PivotTableSources& ScXMLImport::GetPivotTableSources()
     return *mpPivotSources;
 }
 
-SvXMLImportContext *ScXMLImport::CreateDocumentContext( sal_uInt16 nPrefix,
-                                               const OUString& rLocalName,
-                                               const uno::Reference<xml::sax::XAttributeList>& xAttrList )
-{
-    SvXMLImportContext *pContext = nullptr;
-
-    if ( (XML_NAMESPACE_OFFICE == nPrefix) &&
-        ( IsXMLToken(rLocalName, XML_DOCUMENT_META)) ) {
-            pContext = CreateMetaContext(rLocalName);
-    } else if ( (XML_NAMESPACE_OFFICE == nPrefix) &&
-        ( IsXMLToken(rLocalName, XML_DOCUMENT)) ) {
-            uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
-                GetModel(), uno::UNO_QUERY_THROW);
-            // flat OpenDocument file format
-            pContext = new ScXMLFlatDocContext_Impl( *this, nPrefix, rLocalName,
-                xDPS->getDocumentProperties());
-    }
-    else
-        pContext = SvXMLImport::CreateDocumentContext( nPrefix, rLocalName, xAttrList );
-
-    return pContext;
-}
-
 SvXMLImportContext *ScXMLImport::CreateFastContext( sal_Int32 nElement,
         const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
 {
@@ -695,6 +636,10 @@ SvXMLImportContext *ScXMLImport::CreateFastContext( sal_Int32 nElement,
         pContext = new ScXMLDocContext_Impl( *this );
         break;
 
+    case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
+        pContext = CreateMetaContext(nElement);
+        break;
+
     case XML_ELEMENT( OFFICE, XML_DOCUMENT ):
     {
         uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
@@ -847,7 +792,7 @@ SvXMLImportContext *ScXMLImport::CreateBodyContext(const rtl::Reference<sax_fast
 }
 
 SvXMLImportContext *ScXMLImport::CreateMetaContext(
-    const OUString& rLocalName )
+    const sal_Int32 /*nElement*/ )
 {
     SvXMLImportContext* pContext = nullptr;
 
@@ -857,14 +802,11 @@ SvXMLImportContext *ScXMLImport::CreateMetaContext(
             GetModel(), uno::UNO_QUERY_THROW);
         uno::Reference<document::XDocumentProperties> const xDocProps(
             (IsStylesOnlyMode()) ? nullptr : xDPS->getDocumentProperties());
-        pContext = new SvXMLMetaDocumentContext(*this,
-            XML_NAMESPACE_OFFICE, rLocalName,
-            xDocProps);
+        pContext = new SvXMLMetaDocumentContext(*this, xDocProps);
     }
 
     if( !pContext )
-        pContext = new SvXMLImportContext( *this,
-        XML_NAMESPACE_OFFICE, rLocalName );
+        pContext = new SvXMLImportContext( *this );
 
     return pContext;
 }

sc/source/filter/xml/xmlimprt.hxx

@@ -299,10 +299,8 @@ class ScXMLImport: public SvXMLImport
 
 protected:
 
-    virtual SvXMLImportContext *CreateDocumentContext(sal_uInt16 nPrefix,
-                                      const OUString& rLocalName,
-                                      const css::uno::Reference<css::xml::sax::XAttributeList>& xAttrList ) override;
-
+    // This method is called after the namespace map has been updated, but
+    // before a context for the current element has been pushed.
     virtual SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
         const ::css::uno::Reference< ::css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
@@ -322,7 +320,7 @@ public:
     // NB: in contrast to other CreateFooContexts, this particular one handles
     //     the root element (i.e. office:document-meta)
     SvXMLImportContext *CreateMetaContext(
-                                    const OUString& rLocalName );
+                                    const sal_Int32 nElement );
     SvXMLImportContext *CreateFontDeclsContext(const sal_uInt16 nPrefix, const OUString& rLocalName,
                                      const css::uno::Reference<css::xml::sax::XAttributeList>& xAttrList);
     SvXMLImportContext *CreateScriptContext(

sd/source/filter/xml/sdxmlwrp.cxx

@@ -41,6 +41,7 @@
 #include <strmname.h>
 #include <svx/xmleohlp.hxx>
 #include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <com/sun/star/xml/sax/XFastParser.hpp>
 #include <com/sun/star/document/XFilter.hpp>
 #include <com/sun/star/document/XImporter.hpp>
 #include <com/sun/star/document/XExporter.hpp>
@@ -216,11 +217,18 @@ ErrCode ReadThroughComponent(
     // connect model and filter
     Reference < XImporter > xImporter( xFilter, UNO_QUERY );
     xImporter->setTargetDocument( xModelComponent );
+
+    uno::Reference< xml::sax::XFastParser > xFastParser = dynamic_cast<
+                            xml::sax::XFastParser* >( xFilter.get() );
+
     // finally, parser the stream
     SAL_INFO( "sd.filter", "parsing stream" );
     try
     {
-        xParser->parseStream( aParserInput );
+        if( xFastParser.is() )
+            xFastParser->parseStream( aParserInput );
+        else
+            xParser->parseStream( aParserInput );
     }
     catch (const xml::sax::SAXParseException& r)
     {

sdext/CppunitTest_sdext_pdfimport.mk

@@ -30,6 +30,7 @@ $(eval $(call gb_CppunitTest_use_libraries,sdext_pdfimport,\
     sal \
     test \
     unotest \
+    xo \
 ))
 
 $(eval $(call gb_CppunitTest_use_library_objects,sdext_pdfimport,pdfimport))

sdext/Executable_pdf2xml.mk

@@ -30,6 +30,7 @@ $(eval $(call gb_Executable_use_libraries,pdf2xml,\
     unotest \
     cppuhelper \
     sal \
+    xo \
 ))
 
 $(eval $(call gb_Executable_use_library_objects,pdf2xml,pdfimport))

sdext/Executable_pdfunzip.mk

@@ -28,6 +28,7 @@ $(eval $(call gb_Executable_use_libraries,pdfunzip,\
     cppuhelper \
     sal \
     vcl \
+    xo \
 ))
 
 $(eval $(call gb_Executable_use_library_objects,pdfunzip,pdfimport))

sdext/Library_pdfimport.mk

@@ -27,6 +27,7 @@ $(eval $(call gb_Library_use_libraries,pdfimport,\
     cppu \
     cppuhelper \
     sal \
+    xo \
 ))
 
 $(eval $(call gb_Library_use_externals,pdfimport,\

sdext/source/pdfimport/sax/emitcontext.cxx

@@ -27,6 +27,7 @@
 #include <cppuhelper/exc_hlp.hxx>
 #include <com/sun/star/xml/sax/SAXException.hpp>
 #include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <xmloff/xmlimp.hxx>
 
 #if OSL_DEBUG_LEVEL > 0
 #include <osl/file.hxx>
@@ -43,6 +44,8 @@ SaxEmitter::SaxEmitter( const uno::Reference< xml::sax::XDocumentHandler >& xDoc
     m_xDocHdl( xDocHdl )
 {
     OSL_PRECOND(m_xDocHdl.is(), "SaxEmitter(): invalid doc handler");
+    if (SvXMLImport *pFastHandler = dynamic_cast<SvXMLImport*>(m_xDocHdl.get()))
+        m_xDocHdl.set( new SvXMLLegacyToFastDocHandler( pFastHandler ) );
     try
     {
         m_xDocHdl->startDocument();

sfx2/source/doc/SfxDocumentMetaData.cxx

@@ -48,6 +48,7 @@
 #include <com/sun/star/document/XFilter.hpp>
 #include <com/sun/star/xml/sax/Parser.hpp>
 #include <com/sun/star/xml/sax/Writer.hpp>
+#include <com/sun/star/xml/sax/XFastParser.hpp>
 #include <com/sun/star/xml/dom/DOMException.hpp>
 #include <com/sun/star/xml/dom/XDocument.hpp>
 #include <com/sun/star/xml/dom/XElement.hpp>
@@ -1770,8 +1771,13 @@ SfxDocumentMetaData::loadFromStorage(
         css::uno::UNO_QUERY_THROW);
     xImp->setTargetDocument(css::uno::Reference<css::lang::XComponent>(this));
     xParser->setDocumentHandler(xDocHandler);
+    css::uno::Reference< css::xml::sax::XFastParser > xFastParser = dynamic_cast<
+                            css::xml::sax::XFastParser* >( xDocHandler.get() );
     try {
-        xParser->parseStream(input);
+        if( xFastParser.is() )
+            xFastParser->parseStream(input);
+        else
+            xParser->parseStream(input);
     } catch (const css::xml::sax::SAXException &) {
         throw css::io::WrongFormatException(
                 "SfxDocumentMetaData::loadFromStorage:"

starmath/source/mathmlimport.cxx

@@ -24,6 +24,7 @@ one go*/
 
 #include <com/sun/star/xml/sax/InputSource.hpp>
 #include <com/sun/star/xml/sax/Parser.hpp>
+#include <com/sun/star/xml/sax/XFastParser.hpp>
 #include <com/sun/star/document/XDocumentProperties.hpp>
 #include <com/sun/star/document/XDocumentPropertiesSupplier.hpp>
 #include <com/sun/star/packages/WrongPasswordException.hpp>
@@ -286,10 +287,16 @@ ErrCode SmXMLImportWrapper::ReadThroughComponent(
     Reference < XImporter > xImporter( xFilter, UNO_QUERY );
     xImporter->setTargetDocument( xModelComponent );
 
+    uno::Reference< xml::sax::XFastParser > xFastParser = dynamic_cast<
+                            xml::sax::XFastParser* >( xFilter.get() );
+
     // finally, parser the stream
     try
     {
-        xParser->parseStream( aParserInput );
+        if( xFastParser.is() )
+            xFastParser->parseStream( aParserInput );
+        else
+            xParser->parseStream( aParserInput );
 
         uno::Reference<lang::XUnoTunnel> xFilterTunnel( xFilter, uno::UNO_QUERY );
         SmXMLImport *pFilter = reinterpret_cast< SmXMLImport * >(
@@ -1935,11 +1942,20 @@ public:
 class SmXMLOfficeContext_Impl : public virtual SvXMLImportContext
 {
 public:
-    SmXMLOfficeContext_Impl( SmXMLImport &rImport, sal_uInt16 nPrfx,
-        const OUString& rLName)
-        : SvXMLImportContext(rImport,nPrfx,rLName) {}
+    SmXMLOfficeContext_Impl( SmXMLImport &rImport )
+        : SvXMLImportContext(rImport) {}
+
+    virtual void SAL_CALL characters( const OUString& /*aChars*/ ) override {}
+
+    virtual void SAL_CALL startFastElement( sal_Int32 /*nElement*/,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& /*xAttrList*/ ) override {}
+
+    virtual void SAL_CALL endFastElement( sal_Int32 /*nElement*/ ) override {}
 
     virtual SvXMLImportContextRef CreateChildContext(sal_uInt16 nPrefix, const OUString& rLocalName, const uno::Reference< xml::sax::XAttributeList > &xAttrList) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };
 
 SvXMLImportContextRef SmXMLOfficeContext_Impl::CreateChildContext(sal_uInt16 nPrefix,
@@ -1965,6 +1981,12 @@ SvXMLImportContextRef SmXMLOfficeContext_Impl::CreateChildContext(sal_uInt16 nPr
     return pContext;
 }
 
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SmXMLOfficeContext_Impl::createFastChildContext(
+    sal_Int32 /*nElement*/, const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    return new SvXMLImportContext( GetImport() );
+}
+
 
 // context for flat file xml format
 class SmXMLFlatDocContext_Impl
@@ -1972,41 +1994,59 @@ class SmXMLFlatDocContext_Impl
 {
 public:
     SmXMLFlatDocContext_Impl( SmXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
         const uno::Reference<document::XDocumentProperties>& i_xDocProps);
 
-    virtual SvXMLImportContextRef CreateChildContext(sal_uInt16 i_nPrefix, const OUString& i_rLocalName, const uno::Reference<xml::sax::XAttributeList>& i_xAttrList) override;
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
+    virtual void SAL_CALL startFastElement( sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
+
+    virtual void SAL_CALL endFastElement( sal_Int32 nElement ) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };
 
 SmXMLFlatDocContext_Impl::SmXMLFlatDocContext_Impl( SmXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
         const uno::Reference<document::XDocumentProperties>& i_xDocProps) :
-    SvXMLImportContext(i_rImport, i_nPrefix, i_rLName),
-    SmXMLOfficeContext_Impl(i_rImport, i_nPrefix, i_rLName),
-    SvXMLMetaDocumentContext(i_rImport, i_nPrefix, i_rLName,
-        i_xDocProps)
+    SvXMLImportContext(i_rImport),
+    SmXMLOfficeContext_Impl(i_rImport),
+    SvXMLMetaDocumentContext(i_rImport, i_xDocProps)
+{
+}
+
+void SAL_CALL SmXMLFlatDocContext_Impl::startFastElement( sal_Int32 nElement,
+    const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
+{
+    SvXMLMetaDocumentContext::startFastElement(nElement, xAttrList);
+}
+
+void SAL_CALL SmXMLFlatDocContext_Impl::endFastElement( sal_Int32 nElement )
 {
+    SvXMLMetaDocumentContext::endFastElement(nElement);
 }
 
-SvXMLImportContextRef SmXMLFlatDocContext_Impl::CreateChildContext(
-    sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-    const uno::Reference<xml::sax::XAttributeList>& i_xAttrList)
+void SAL_CALL SmXMLFlatDocContext_Impl::characters( const OUString& rChars )
+{
+    SvXMLMetaDocumentContext::characters(rChars);
+}
+
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SmXMLFlatDocContext_Impl::createFastChildContext(
+    sal_Int32 nElement, const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
     // behave like meta base class iff we encounter office:meta
-    if ( XML_NAMESPACE_OFFICE == i_nPrefix &&
-            i_rLocalName == GetXMLToken(XML_META) )
+    if ( nElement == XML_ELEMENT(OFFICE, XML_META) )
     {
-        return SvXMLMetaDocumentContext::CreateChildContext(
-                    i_nPrefix, i_rLocalName, i_xAttrList );
+        return SvXMLMetaDocumentContext::createFastChildContext(
+                    nElement, xAttrList );
     }
     else
     {
-        return SmXMLOfficeContext_Impl::CreateChildContext(
-                    i_nPrefix, i_rLocalName, i_xAttrList );
+        return SmXMLOfficeContext_Impl::createFastChildContext(
+                    nElement, xAttrList );
     }
 }
 
-
 static const SvXMLTokenMapEntry aPresLayoutElemTokenMap[] =
 {
     { XML_NAMESPACE_MATH,   XML_SEMANTICS, XML_TOK_SEMANTICS },
@@ -2823,28 +2863,40 @@ SvXMLImportContext *SmXMLImport::CreateDocumentContext(sal_uInt16 nPrefix,
     const OUString &rLocalName,
     const uno::Reference <xml::sax::XAttributeList> & /*xAttrList*/)
 {
-    if ( XML_NAMESPACE_OFFICE == nPrefix )
+    SvXMLImportContext *pContext = nullptr;
+    if ( XML_NAMESPACE_OFFICE != nPrefix )
+        pContext = new SmXMLDocContext_Impl(*this,nPrefix,rLocalName);
+
+    return pContext;
+}
+
+SvXMLImportContext *SmXMLImport::CreateFastContext(sal_Int32 nElement,
+    const uno::Reference <xml::sax::XFastAttributeList> & /*xAttrList*/)
+{
+    SvXMLImportContext *pContext = nullptr;
+
+    switch (nElement)
     {
-        if ( IsXMLToken(rLocalName, XML_DOCUMENT) ||
-             IsXMLToken(rLocalName, XML_DOCUMENT_META) )
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT ):
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
         {
             uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
                 GetModel(), uno::UNO_QUERY_THROW);
-            return IsXMLToken(rLocalName, XML_DOCUMENT_META)
-                ? new SvXMLMetaDocumentContext(*this,
-                        XML_NAMESPACE_OFFICE, rLocalName,
-                        xDPS->getDocumentProperties())
+            pContext = ( (nElement & TOKEN_MASK) == XML_DOCUMENT_META )
+                ? new SvXMLMetaDocumentContext( *this,
+                        xDPS->getDocumentProperties() )
                 // flat OpenDocument file format -- this has not been tested...
-                : new SmXMLFlatDocContext_Impl( *this, nPrefix, rLocalName,
-                            xDPS->getDocumentProperties());
-        }
-        else
-        {
-            return new SmXMLOfficeContext_Impl( *this,nPrefix,rLocalName);
+                : new SmXMLFlatDocContext_Impl( *this,
+                            xDPS->getDocumentProperties() );
         }
+        break;
+        default:
+            if ((nElement & NMSP_MASK) == NAMESPACE_TOKEN(XML_NAMESPACE_OFFICE))
+                pContext = new SmXMLOfficeContext_Impl(*this);
+            else
+                pContext = new SvXMLImportContext(*this);
     }
-    else
-        return new SmXMLDocContext_Impl(*this,nPrefix,rLocalName);
+    return pContext;
 }
 
 SvXMLImportContext *SmXMLImport::CreateRowContext(sal_uInt16 nPrefix,

starmath/source/mathmlimport.hxx

@@ -99,6 +99,9 @@ public:
         const OUString &rLocalName,
         const css::uno::Reference <
         css::xml::sax::XAttributeList> &xAttrList) override;
+    SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
+        const css::uno::Reference<
+        css::xml::sax::XFastAttributeList >& xAttrList ) override;
     SvXMLImportContext *CreateRowContext(sal_uInt16 nPrefix,
         const OUString &rLocalName);
     SvXMLImportContext *CreateEncloseContext(sal_uInt16 nPrefix,

sw/source/filter/xml/swxml.cxx

@@ -34,6 +34,7 @@
 #include <com/sun/star/packages/zip/ZipIOException.hpp>
 #include <com/sun/star/packages/WrongPasswordException.hpp>
 #include <com/sun/star/ucb/InteractiveAugmentedIOException.hpp>
+#include <com/sun/star/xml/sax/XFastParser.hpp>
 #include <o3tl/any.hxx>
 #include <vcl/errinf.hxx>
 #include <sfx2/docfile.hxx>
@@ -168,11 +169,16 @@ ErrCode ReadThroughComponent(
     // connect model and filter
     uno::Reference < XImporter > xImporter( xFilter, UNO_QUERY );
     xImporter->setTargetDocument( xModelComponent );
+    uno::Reference< xml::sax::XFastParser > xFastParser = dynamic_cast<
+                            xml::sax::XFastParser* >( xFilter.get() );
 
     // finally, parser the stream
     try
     {
-        xParser->parseStream( aParserInput );
+        if( xFastParser.is() )
+            xFastParser->parseStream( aParserInput );
+        else
+            xParser->parseStream( aParserInput );
     }
     catch( xml::sax::SAXParseException& r )
     {

sw/source/filter/xml/xmlimp.cxx

@@ -196,9 +196,14 @@ public:
     SwXMLDocContext_Impl( SwXMLImport& rImport, sal_uInt16 nPrfx,
                 const OUString& rLName );
 
+    SwXMLDocContext_Impl( SwXMLImport& rImport );
+
     virtual SvXMLImportContextRef CreateChildContext( sal_uInt16 nPrefix,
                 const OUString& rLocalName,
                 const Reference< xml::sax::XAttributeList > & xAttrList ) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };