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/xmlnmspe.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/uri/XUriReference.hpp>
  31 #include <com/sun/star/uri/UriReferenceFactory.hpp>
  32 #include <com/sun/star/rdf/Statement.hpp>
  33 #include <com/sun/star/rdf/URIs.hpp>
  34 #include <com/sun/star/rdf/URI.hpp>
  35 #include <com/sun/star/rdf/XLiteral.hpp>
  36 #include <com/sun/star/rdf/XRepositorySupplier.hpp>
  37 #include <com/sun/star/rdf/XDocumentRepository.hpp>
  38
  39 #include <rtl/ustrbuf.hxx>
  40
  41 #include <functional>
  42 #include <algorithm>
  43
  44 using namespace ::com::sun::star;
  45
  46 namespace xmloff {
  47
  48 static OUString
  49 makeCURIE(SvXMLExport * i_pExport,
  50     uno::Reference<rdf::XURI> const & i_xURI)
  51 {
  52     OSL_ENSURE(i_xURI.is(), "makeCURIE: null URI");
  53     if (!i_xURI.is()) throw uno::RuntimeException();
  54
  55     const OUString Namespace( i_xURI->getNamespace() );
  56     OSL_ENSURE(!Namespace.isEmpty(), "makeCURIE: no namespace");
  57     if (Namespace.isEmpty()) throw uno::RuntimeException();
  58
  59     // N.B.: empty LocalName is valid!
  60     return i_pExport->EnsureNamespace(Namespace) + ":" + i_xURI->getLocalName();
  61 }
  62
  63 // #i112473# SvXMLExport::GetRelativeReference() not right for RDF on SaveAs
  64 // because the URIs in the repository are not rewritten on SaveAs, the
  65 // URI of the loaded document has to be used, not the URI of the target doc.
  66 static OUString
  67 getRelativeReference(SvXMLExport const& rExport, OUString const& rURI)
  68 {
  69     uno::Reference< rdf::XURI > const xModelURI(
  70         rExport.GetModel(), uno::UNO_QUERY_THROW );
  71     OUString const baseURI( xModelURI->getStringValue() );
  72
  73     uno::Reference<uno::XComponentContext> xContext( comphelper::getProcessComponentContext() );
  74     uno::Reference<uri::XUriReferenceFactory> const xUriFactory =
  75         uri::UriReferenceFactory::create( xContext );
  76
  77     uno::Reference< uri::XUriReference > const xBaseURI(
  78         xUriFactory->parse(baseURI), uno::UNO_SET_THROW );
  79     uno::Reference< uri::XUriReference > const xAbsoluteURI(
  80         xUriFactory->parse(rURI), uno::UNO_SET_THROW );
  81     uno::Reference< uri::XUriReference > const xRelativeURI(
  82         xUriFactory->makeRelative(xBaseURI, xAbsoluteURI, true, true, false),
  83         uno::UNO_SET_THROW );
  84     OUString const relativeURI(xRelativeURI->getUriReference());
  85
  86     return relativeURI;
  87 }
  88
  89 RDFaExportHelper::RDFaExportHelper(SvXMLExport & i_rExport)
  90     : m_rExport(i_rExport), m_xRepository(nullptr), m_Counter(0)
  91 {
  92     const uno::Reference<rdf::XRepositorySupplier> xRS( m_rExport.GetModel(),
  93             uno::UNO_QUERY);
  94     OSL_ENSURE(xRS.is(), "AddRDFa: model is no rdf::XRepositorySupplier");
  95     if (!xRS.is()) throw uno::RuntimeException();
  96     m_xRepository.set(xRS->getRDFRepository(), uno::UNO_QUERY_THROW);
  97 }
  98
  99 OUString
 100 RDFaExportHelper::LookupBlankNode(
 101     uno::Reference<rdf::XBlankNode> const & i_xBlankNode)
 102 {
 103     OSL_ENSURE(i_xBlankNode.is(), "null BlankNode?");
 104     if (!i_xBlankNode.is()) throw uno::RuntimeException();
 105     OUString & rEntry(
 106         m_BlankNodeMap[ i_xBlankNode->getStringValue() ] );
 107     if (rEntry.isEmpty())
 108     {
 109         rEntry = "_:b" + OUString::number(++m_Counter);
 110     }
 111     return rEntry;
 112 }
 113
 114 void
 115 RDFaExportHelper::AddRDFa(
 116     uno::Reference<rdf::XMetadatable> const & i_xMetadatable)
 117 {
 118     try
 119     {
 120         beans::Pair< uno::Sequence<rdf::Statement>, sal_Bool > const
 121             RDFaResult( m_xRepository->getStatementRDFa(i_xMetadatable) );
 122
 123         uno::Sequence<rdf::Statement> const & rStatements( RDFaResult.First );
 124
 125         if (0 == rStatements.getLength())
 126         {
 127             return; // no RDFa
 128         }
 129
 130         // all stmts have the same subject, so we only handle first one
 131         const uno::Reference<rdf::XURI> xSubjectURI(rStatements[0].Subject,
 132             uno::UNO_QUERY);
 133         const uno::Reference<rdf::XBlankNode> xSubjectBNode(
 134             rStatements[0].Subject, uno::UNO_QUERY);
 135         if (!xSubjectURI.is() && !xSubjectBNode.is())
 136         {
 137             throw uno::RuntimeException();
 138         }
 139         const OUString about( xSubjectURI.is()
 140             ?   getRelativeReference(m_rExport, xSubjectURI->getStringValue())
 141             :   "[" + LookupBlankNode(xSubjectBNode) + "]"
 142             );
 143
 144         const uno::Reference<rdf::XLiteral> xContent(
 145             rStatements[0].Object, uno::UNO_QUERY_THROW );
 146         const uno::Reference<rdf::XURI> xDatatype(xContent->getDatatype());
 147         if (xDatatype.is())
 148         {
 149             const OUString datatype(
 150                 makeCURIE(&m_rExport, xDatatype) );
 151             m_rExport.AddAttribute(XML_NAMESPACE_XHTML,
 152                 token::XML_DATATYPE, datatype);
 153         }
 154         if (RDFaResult.Second) // there is xhtml:content
 155         {
 156             m_rExport.AddAttribute(XML_NAMESPACE_XHTML, token::XML_CONTENT,
 157                 xContent->getValue());
 158         }
 159
 160         ::std::vector<::rtl::OUString> curies;
 161         for (rdf::Statement const& rStatement : rStatements)
 162         {
 163             curies.push_back(makeCURIE(&m_rExport, rStatement.Predicate));
 164         }
 165         OUStringBuffer property;
 166         ::comphelper::intersperse(curies.begin(), curies.end(),
 167             ::comphelper::OUStringBufferAppender(property),
 168             OUString(" "));
 169
 170         m_rExport.AddAttribute(XML_NAMESPACE_XHTML, token::XML_PROPERTY,
 171             property.makeStringAndClear());
 172
 173         m_rExport.AddAttribute(XML_NAMESPACE_XHTML, token::XML_ABOUT, about);
 174     }
 175     catch (uno::Exception &)
 176     {
 177         OSL_FAIL("AddRDFa: exception");
 178     }
 179 }
 180
 181 } // namespace xmloff
 182
 183 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */