    /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
    /*
     * This file is part of the LibreOffice project.
     *
     * This Source Code Form is subject to the terms of the Mozilla Public
     * License, v. 2.0. If a copy of the MPL was not distributed with this
     * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     *
     * This file incorporates work covered by the following license notice:
     *
     *   Licensed to the Apache Software Foundation (ASF) under one or more
     *   contributor license agreements. See the NOTICE file distributed
     *   with this work for additional information regarding copyright
     *   ownership. The ASF licenses this file to you under the Apache
     *   License, Version 2.0 (the "License"); you may not use this file
     *   except in compliance with the License. You may obtain a copy of
     *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
     */

    #include "saxbuilder.hxx"

    #include <com/sun/star/xml/dom/DocumentBuilder.hpp>
    #include <com/sun/star/xml/sax/SAXException.hpp>
    #include <comphelper/processfactory.hxx>
    #include <cppuhelper/supportsservice.hxx>
    #include <sax/fastattribs.hxx>
    #include <xmloff/xmlimp.hxx>

    using namespace css::lang;
    using namespace css::uno;
    using namespace css::xml::dom;
    using namespace css::xml::sax;

    namespace DOM
    {
        Reference< XInterface > CSAXDocumentBuilder::_getInstance(const Reference< XMultiServiceFactory >& rSMgr)
        {
            return static_cast< XSAXDocumentBuilder* >(new CSAXDocumentBuilder(rSMgr));
        }

        const char* CSAXDocumentBuilder::aImplementationName = "com.sun.star.comp.xml.dom.SAXDocumentBuilder";
        const char* CSAXDocumentBuilder::aSupportedServiceNames[] = {
            "com.sun.star.xml.dom.SAXDocumentBuilder",
            nullptr
        };

        CSAXDocumentBuilder::CSAXDocumentBuilder(const Reference< XMultiServiceFactory >& mgr)
            : m_aServiceManager(mgr)
            , m_aState( SAXDocumentBuilderState_READY)
        {}

        OUString CSAXDocumentBuilder::_getImplementationName()
        {
            return OUString::createFromAscii(aImplementationName);
        }
        Sequence<OUString> CSAXDocumentBuilder::_getSupportedServiceNames()
        {
            Sequence<OUString> aSequence;
            for (int i=0; aSupportedServiceNames[i]!=nullptr; i++) {
                aSequence.realloc(i+1);
                aSequence[i] = OUString::createFromAscii(aSupportedServiceNames[i]);
            }
            return aSequence;
        }

        Sequence< OUString > SAL_CALL CSAXDocumentBuilder::getSupportedServiceNames()
        {
            return CSAXDocumentBuilder::_getSupportedServiceNames();
        }

        OUString SAL_CALL CSAXDocumentBuilder::getImplementationName()
        {
            return CSAXDocumentBuilder::_getImplementationName();
        }

        sal_Bool SAL_CALL CSAXDocumentBuilder::supportsService(const OUString& aServiceName)
        {
            return cppu::supportsService(this, aServiceName);
        }

        SAXDocumentBuilderState SAL_CALL CSAXDocumentBuilder::getState()
        {
            ::osl::MutexGuard g(m_Mutex);

            return m_aState;
        }

        void SAL_CALL CSAXDocumentBuilder::reset()
        {
            ::osl::MutexGuard g(m_Mutex);

            m_aDocument.clear();
            m_aFragment.clear();
            while (!m_aNodeStack.empty()) m_aNodeStack.pop();
            m_aState = SAXDocumentBuilderState_READY;
        }

        Reference< XDocument > SAL_CALL CSAXDocumentBuilder::getDocument()
        {
            ::osl::MutexGuard g(m_Mutex);

            if (m_aState != SAXDocumentBuilderState_DOCUMENT_FINISHED)
                throw RuntimeException();

            return m_aDocument;
        }

        Reference< XDocumentFragment > SAL_CALL CSAXDocumentBuilder::getDocumentFragment()
        {
            ::osl::MutexGuard g(m_Mutex);

            if (m_aState != SAXDocumentBuilderState_FRAGMENT_FINISHED)
                throw RuntimeException();
            return m_aFragment;
        }

        void SAL_CALL CSAXDocumentBuilder::startDocumentFragment(const Reference< XDocument >& ownerDoc)
        {
            ::osl::MutexGuard g(m_Mutex);

            // start a new document fragment and push it onto the stack
            // we have to be in a clean state to do this
            if (m_aState != SAXDocumentBuilderState_READY)
                throw RuntimeException();

            m_aDocument = ownerDoc;
            Reference< XDocumentFragment > aFragment = m_aDocument->createDocumentFragment();
            m_aNodeStack.push(aFragment);
            m_aFragment = aFragment;
            m_aState = SAXDocumentBuilderState_BUILDING_FRAGMENT;
        }

        void SAL_CALL CSAXDocumentBuilder::endDocumentFragment()
        {
            ::osl::MutexGuard g(m_Mutex);

            // there should only be the document left on the node stack
            if (m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
                throw RuntimeException();

            Reference< XNode > aNode = m_aNodeStack.top();
            if ( aNode->getNodeType() != NodeType_DOCUMENT_FRAGMENT_NODE)
                throw RuntimeException();
            m_aNodeStack.pop();
            m_aState = SAXDocumentBuilderState_FRAGMENT_FINISHED;
        }

        //XFastDocumentHandler
        void SAL_CALL CSAXDocumentBuilder::startDocument()
        {
            ::osl::MutexGuard g(m_Mutex);

            // start a new document and push it onto the stack
            // we have to be in a clean state to do this
            if (m_aState != SAXDocumentBuilderState_READY)
                throw SAXException();

            Reference< XDocumentBuilder > aBuilder(DocumentBuilder::create(comphelper::getComponentContext(m_aServiceManager)));
            Reference< XDocument > aDocument = aBuilder->newDocument();
            m_aNodeStack.push(aDocument);
            m_aDocument = aDocument;
            m_aState = SAXDocumentBuilderState_BUILDING_DOCUMENT;
        }

        void SAL_CALL CSAXDocumentBuilder::endDocument()
        {
            ::osl::MutexGuard g(m_Mutex);

            // there should only be the document left on the node stack
            if (m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT)
                throw SAXException();

            Reference< XNode > aNode = m_aNodeStack.top();
            if ( aNode->getNodeType() != NodeType_DOCUMENT_NODE)
                throw SAXException();
            m_aNodeStack.pop();
            m_aState = SAXDocumentBuilderState_DOCUMENT_FINISHED;
        }

        void SAL_CALL CSAXDocumentBuilder::processingInstruction( const OUString& rTarget, const OUString& rData )
        {
            ::osl::MutexGuard g(m_Mutex);

            //  append PI node to the current top
            if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
                 m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
                throw SAXException();

            Reference< XProcessingInstruction > aInstruction = m_aDocument->createProcessingInstruction(
                    rTarget, rData);
            m_aNodeStack.top()->appendChild(aInstruction);
        }

        void SAL_CALL CSAXDocumentBuilder::setDocumentLocator( const Reference< XLocator >& xLocator )
        {
            ::osl::MutexGuard g(m_Mutex);

            // set the document locator...
            m_aLocator = xLocator;
        }

        void SAL_CALL CSAXDocumentBuilder::startFastElement( sal_Int32 nElement , const Reference< XFastAttributeList >& xAttribs  )
        {
            ::osl::MutexGuard g(m_Mutex);

            if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
                 m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
            {
                throw SAXException();
            }

            Reference< XElement > aElement;
            const OUString& aPrefix(SvXMLImport::getNamespacePrefixFromToken(nElement, nullptr));
            const OUString& aURI( SvXMLImport::getNamespaceURIFromToken( nElement ) );
            OUString aQualifiedName( SvXMLImport::getNameFromToken( nElement ) );
            if( !aPrefix.isEmpty() )
                aQualifiedName = aPrefix + SvXMLImport::aNamespaceSeparator + aQualifiedName;

            if ( !aURI.isEmpty() )
            {
                // found a URI for prefix
                // qualified name
                aElement = m_aDocument->createElementNS( aURI, aQualifiedName );
            }
            else
            {
                // no URI for prefix
                aElement = m_aDocument->createElement( aQualifiedName );
            }
            aElement.set( m_aNodeStack.top()->appendChild(aElement), UNO_QUERY);
            m_aNodeStack.push(aElement);

            if (xAttribs.is())
                setElementFastAttributes(aElement, xAttribs);
        }

        // For arbitrary meta elements
        void SAL_CALL CSAXDocumentBuilder::startUnknownElement( const OUString& rNamespace, const OUString& rName, const Reference< XFastAttributeList >& xAttribs )
        {
            ::osl::MutexGuard g(m_Mutex);

            if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
                 m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
            {
                throw SAXException();
            }

            Reference< XElement > aElement;
            if ( !rNamespace.isEmpty() )
                aElement = m_aDocument->createElementNS( rNamespace, rName );
            else
                aElement = m_aDocument->createElement( rName );

            aElement.set( m_aNodeStack.top()->appendChild(aElement), UNO_QUERY);
            m_aNodeStack.push(aElement);

            if (xAttribs.is())
            {
                setElementFastAttributes(aElement, xAttribs);
                Sequence< css::xml::Attribute > unknownAttribs = xAttribs->getUnknownAttributes();
                sal_Int32 len = unknownAttribs.getLength();
                for ( sal_Int32 i = 0; i < len; i++ )
                {
                    const OUString& rAttrValue = unknownAttribs[i].Value;
                    const OUString& rAttrName = unknownAttribs[i].Name;
                    const OUString& rAttrNamespace = unknownAttribs[i].NamespaceURL;
                    if ( !rAttrNamespace.isEmpty() )
                        aElement->setAttributeNS( rAttrNamespace, rAttrName, rAttrValue );
                    else
                        aElement->setAttribute( rAttrName, rAttrValue );
                }
            }
        }

        void CSAXDocumentBuilder::setElementFastAttributes(const Reference< XElement >& aElement, const Reference< XFastAttributeList >& xAttribs)
        {
            sax_fastparser::FastAttributeList *pAttribList =
                sax_fastparser::FastAttributeList::castToFastAttributeList( xAttribs );

            for (auto &it : *pAttribList)
            {
                sal_Int32 nAttrToken = it.getToken();
                const OUString& aAttrPrefix(SvXMLImport::getNamespacePrefixFromToken(nAttrToken, nullptr));
                const OUString& aAttrURI( SvXMLImport::getNamespaceURIFromToken( nAttrToken ) );
                OUString aAttrQualifiedName( SvXMLImport::getNameFromToken( nAttrToken ) );
                if( !aAttrPrefix.isEmpty() )
                    aAttrQualifiedName = aAttrPrefix + SvXMLImport::aNamespaceSeparator + aAttrQualifiedName;

                if ( !aAttrURI.isEmpty() )
                    aElement->setAttributeNS( aAttrURI, aAttrQualifiedName, it.toString() );
                else
                    aElement->setAttribute( aAttrQualifiedName, it.toString() );
            }
        }

        void SAL_CALL CSAXDocumentBuilder::endFastElement( sal_Int32 nElement )
        {
            ::osl::MutexGuard g(m_Mutex);

            // pop the current element from the stack
            if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
                 m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
                throw SAXException();

            Reference< XNode > aNode(m_aNodeStack.top());
            if (aNode->getNodeType() != NodeType_ELEMENT_NODE)
                throw SAXException();

            Reference< XElement > aElement(aNode, UNO_QUERY);
            if( aElement->getPrefix() != SvXMLImport::getNamespacePrefixFromToken(nElement, nullptr) ||
                aElement->getTagName() != SvXMLImport::getNameFromToken( nElement ) ) // consistency check
                throw SAXException();

            // pop it
            m_aNodeStack.pop();
        }

        void SAL_CALL CSAXDocumentBuilder::endUnknownElement( const OUString& /*rNamespace*/, const OUString& rName )
        {
            ::osl::MutexGuard g(m_Mutex);

            // pop the current element from the stack
            if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
                 m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
                throw SAXException();

            Reference< XNode > aNode(m_aNodeStack.top());
            if (aNode->getNodeType() != NodeType_ELEMENT_NODE)
                throw SAXException();

            Reference< XElement > aElement(aNode, UNO_QUERY);
            OUString aRefName;
            const OUString& aPrefix = aElement->getPrefix();
            if (!aPrefix.isEmpty())
                aRefName = aPrefix + SvXMLImport::aNamespaceSeparator + aElement->getTagName();
            else
                aRefName = aElement->getTagName();
            if (aRefName != rName) // consistency check
                throw SAXException();

            // pop it
            m_aNodeStack.pop();
        }

        Reference< XFastContextHandler > SAL_CALL CSAXDocumentBuilder::createFastChildContext( sal_Int32/* nElement */, const Reference< XFastAttributeList >&/* xAttribs */ )
        {
            return nullptr;
        }

        Reference< XFastContextHandler > SAL_CALL CSAXDocumentBuilder::createUnknownChildContext( const OUString&/* rNamespace */, const OUString&/* rName */, const Reference< XFastAttributeList >&/* xAttribs */ )
        {
            return nullptr;
        }

        void SAL_CALL CSAXDocumentBuilder::characters( const OUString& rChars )
        {
            ::osl::MutexGuard g(m_Mutex);

            //  append text node to the current top element
             if (m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
                 m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
                throw SAXException();

             Reference< XText > aText = m_aDocument->createTextNode(rChars);
             m_aNodeStack.top()->appendChild(aText);
        }
    }

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V572 It is odd that the object which was created using 'new' operator is immediately cast to another type.