xmloff/source/core/RDFaExportHelper.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <RDFaExportHelper.hxx>
  21
  22 #include <xmloff/xmlnamespace.hxx>
  23
  24 #include <xmloff/xmlexp.hxx>
  25 #include <xmloff/xmltoken.hxx>
  26
  27 #include <comphelper/stl_types.hxx>
  28 #include <comphelper/processfactory.hxx>
  29
  30 #include <com/sun/star/frame/XModel.hpp>
  31 #include <com/sun/star/uri/XUriReference.hpp>
  32 #include <com/sun/star/uri/UriReferenceFactory.hpp>
  33 #include <com/sun/star/rdf/Statement.hpp>
  34 #include <com/sun/star/rdf/XLiteral.hpp>
  35 #include <com/sun/star/rdf/XRepositorySupplier.hpp>
  36 #include <com/sun/star/rdf/XDocumentRepository.hpp>
  37
  38 #include <rtl/ustrbuf.hxx>
  39 #include <comphelper/diagnose_ex.hxx>
  40
  41 #include <algorithm>
  42
  43 using namespace ::com::sun::star;
  44
  45 namespace xmloff {
  46
  47 static OUString
  48 makeCURIE(SvXMLExport * i_pExport,
  49     uno::Reference<rdf::XURI> const & i_xURI)
  50 {
  51     OSL_ENSURE(i_xURI.is(), "makeCURIE: null URI");
  52     if (!i_xURI.is()) throw uno::RuntimeException();
  53
  54     const OUString Namespace( i_xURI->getNamespace() );
  55     OSL_ENSURE(!Namespace.isEmpty(), "makeCURIE: no namespace");
  56     if (Namespace.isEmpty()) throw uno::RuntimeException();
  57
  58     // N.B.: empty LocalName is valid!
  59     return i_pExport->EnsureNamespace(Namespace) + ":" + i_xURI->getLocalName();
  60 }
  61
  62 // #i112473# SvXMLExport::GetRelativeReference() not right for RDF on SaveAs
  63 // because the URIs in the repository are not rewritten on SaveAs, the
  64 // URI of the loaded document has to be used, not the URI of the target doc.
  65 static OUString
  66 getRelativeReference(SvXMLExport const& rExport, OUString const& rURI)
  67 {
  68     uno::Reference< rdf::XURI > const xModelURI(
  69         rExport.GetModel(), uno::UNO_QUERY_THROW );
  70     OUString const baseURI( xModelURI->getStringValue() );
  71
  72     const uno::Reference<uno::XComponentContext>& xContext( comphelper::getProcessComponentContext() );
  73     uno::Reference<uri::XUriReferenceFactory> const xUriFactory =
  74         uri::UriReferenceFactory::create( xContext );
  75
  76     uno::Reference< uri::XUriReference > const xBaseURI(
  77         xUriFactory->parse(baseURI), uno::UNO_SET_THROW );
  78     uno::Reference< uri::XUriReference > const xAbsoluteURI(
  79         xUriFactory->parse(rURI), uno::UNO_SET_THROW );
  80     uno::Reference< uri::XUriReference > const xRelativeURI(
  81         xUriFactory->makeRelative(xBaseURI, xAbsoluteURI, true, true, false),
  82         uno::UNO_SET_THROW );
  83     OUString const relativeURI(xRelativeURI->getUriReference());
  84
  85     return relativeURI;
  86 }
  87
  88 RDFaExportHelper::RDFaExportHelper(SvXMLExport & i_rExport)
  89     : m_rExport(i_rExport), m_Counter(0)
  90 {
  91     const uno::Reference<rdf::XRepositorySupplier> xRS( m_rExport.GetModel(),
  92             uno::UNO_QUERY_THROW);
  93     m_xRepository.set(xRS->getRDFRepository(), uno::UNO_QUERY_THROW);
  94 }
  95
  96 OUString
  97 RDFaExportHelper::LookupBlankNode(
  98     uno::Reference<rdf::XBlankNode> const & i_xBlankNode)
  99 {
 100     OSL_ENSURE(i_xBlankNode.is(), "null BlankNode?");
 101     if (!i_xBlankNode.is()) throw uno::RuntimeException();
 102     OUString & rEntry(
 103         m_BlankNodeMap[ i_xBlankNode->getStringValue() ] );
 104     if (rEntry.isEmpty())
 105     {
 106         rEntry = "_:b" + OUString::number(++m_Counter);
 107     }
 108     return rEntry;
 109 }
 110
 111 void
 112 RDFaExportHelper::AddRDFa(
 113     uno::Reference<rdf::XMetadatable> const & i_xMetadatable)
 114 {
 115     try
 116     {
 117         beans::Pair< uno::Sequence<rdf::Statement>, sal_Bool > const
 118             RDFaResult( m_xRepository->getStatementRDFa(i_xMetadatable) );
 119
 120         uno::Sequence<rdf::Statement> const & rStatements( RDFaResult.First );
 121
 122         if (!rStatements.hasElements())
 123         {
 124             return; // no RDFa
 125         }
 126
 127         // all stmts have the same subject, so we only handle first one
 128         const uno::Reference<rdf::XURI> xSubjectURI(rStatements[0].Subject,
 129             uno::UNO_QUERY);
 130         const uno::Reference<rdf::XBlankNode> xSubjectBNode(
 131             rStatements[0].Subject, uno::UNO_QUERY);
 132         if (!xSubjectURI.is() && !xSubjectBNode.is())
 133         {
 134             throw uno::RuntimeException();
 135         }
 136         const OUString about( xSubjectURI.is()
 137             ?   getRelativeReference(m_rExport, xSubjectURI->getStringValue())
 138             :   "[" + LookupBlankNode(xSubjectBNode) + "]"
 139             );
 140
 141         const uno::Reference<rdf::XLiteral> xContent(
 142             rStatements[0].Object, uno::UNO_QUERY_THROW );
 143         const uno::Reference<rdf::XURI> xDatatype(xContent->getDatatype());
 144         if (xDatatype.is())
 145         {
 146             const OUString datatype(
 147                 makeCURIE(&m_rExport, xDatatype) );
 148             m_rExport.AddAttribute(XML_NAMESPACE_XHTML,
 149                 token::XML_DATATYPE, datatype);
 150         }
 151         if (RDFaResult.Second) // there is xhtml:content
 152         {
 153             m_rExport.AddAttribute(XML_NAMESPACE_XHTML, token::XML_CONTENT,
 154                 xContent->getValue());
 155         }
 156
 157         ::std::vector<OUString> curies;
 158         for (rdf::Statement const& rStatement : rStatements)
 159         {
 160             curies.push_back(makeCURIE(&m_rExport, rStatement.Predicate));
 161         }
 162         OUStringBuffer property;
 163         ::comphelper::intersperse(curies.begin(), curies.end(),
 164             ::comphelper::OUStringBufferAppender(property),
 165             u" "_ustr);
 166
 167         m_rExport.AddAttribute(XML_NAMESPACE_XHTML, token::XML_PROPERTY,
 168             property.makeStringAndClear());
 169
 170         m_rExport.AddAttribute(XML_NAMESPACE_XHTML, token::XML_ABOUT, about);
 171     }
 172     catch (uno::Exception &)
 173     {
 174         TOOLS_WARN_EXCEPTION("xmloff.core", "");
 175     }
 176 }
 177
 178 } // namespace xmloff
 179
 180 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */