    /* -*- 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 .
     */

    /**************************************************************************
                                    TODO
     **************************************************************************

     *************************************************************************/

    #include <vector>

    #include <com/sun/star/ucb/IllegalIdentifierException.hpp>
    #include <com/sun/star/ucb/ResultSetException.hpp>
    #include <osl/diagnose.h>
    #include <ucbhelper/contentidentifier.hxx>

    #include "tdoc_datasupplier.hxx"
    #include "tdoc_content.hxx"

    using namespace com::sun::star;
    using namespace tdoc_ucp;

    namespace tdoc_ucp
    {

    // struct ResultListEntry.

    struct ResultListEntry
    {
        OUString                                  aURL;
        uno::Reference< ucb::XContentIdentifier > xId;
        uno::Reference< ucb::XContent >           xContent;
        uno::Reference< sdbc::XRow >              xRow;

        explicit ResultListEntry( const OUString& rURL ) : aURL( rURL ) {}
    };

    // struct DataSupplier_Impl.

    struct DataSupplier_Impl
    {
        osl::Mutex                                   m_aMutex;
        std::vector< ResultListEntry >               m_aResults;
        rtl::Reference< Content >                    m_xContent;
        uno::Reference< uno::XComponentContext >     m_xContext;
        std::unique_ptr<uno::Sequence< OUString > >  m_pNamesOfChildren;
        bool                                         m_bCountFinal;
        bool                                         m_bThrowException;

        DataSupplier_Impl(
                const uno::Reference< uno::XComponentContext >& rxContext,
                const rtl::Reference< Content >& rContent )
        : m_xContent( rContent ), m_xContext( rxContext ),
          m_bCountFinal( false ), m_bThrowException( false )
        {}
    };

    }

    // DataSupplier Implementation.
    ResultSetDataSupplier::ResultSetDataSupplier(
                    const uno::Reference< uno::XComponentContext >& rxContext,
                    const rtl::Reference< Content >& rContent )
    : m_pImpl( new DataSupplier_Impl( rxContext, rContent ) )
    {
    }

    // virtual
    ResultSetDataSupplier::~ResultSetDataSupplier()
    {
    }

    // virtual
    OUString
    ResultSetDataSupplier::queryContentIdentifierString( sal_uInt32 nIndex )
    {
        osl::Guard< osl::Mutex > aGuard( m_pImpl->m_aMutex );

        if ( nIndex < m_pImpl->m_aResults.size() )
        {
            OUString aId = m_pImpl->m_aResults[ nIndex ].aURL;
            if ( !aId.isEmpty() )
            {
                // Already cached.
                return aId;
            }
        }

        if ( getResult( nIndex ) )
        {
            // Note: getResult fills m_pImpl->m_aResults[ nIndex ]->aURL.
            return m_pImpl->m_aResults[ nIndex ].aURL;
        }
        return OUString();
    }

    // virtual
    uno::Reference< ucb::XContentIdentifier >
    ResultSetDataSupplier::queryContentIdentifier( sal_uInt32 nIndex )
    {
        osl::Guard< osl::Mutex > aGuard( m_pImpl->m_aMutex );

        if ( nIndex < m_pImpl->m_aResults.size() )
        {
            uno::Reference< ucb::XContentIdentifier > xId
                                    = m_pImpl->m_aResults[ nIndex ].xId;
            if ( xId.is() )
            {
                // Already cached.
                return xId;
            }
        }

        OUString aId = queryContentIdentifierString( nIndex );
        if ( !aId.isEmpty() )
        {
            uno::Reference< ucb::XContentIdentifier > xId
                = new ::ucbhelper::ContentIdentifier( aId );
            m_pImpl->m_aResults[ nIndex ].xId = xId;
            return xId;
        }
        return uno::Reference< ucb::XContentIdentifier >();
    }

    // virtual
    uno::Reference< ucb::XContent >
    ResultSetDataSupplier::queryContent( sal_uInt32 nIndex )
    {
        osl::Guard< osl::Mutex > aGuard( m_pImpl->m_aMutex );

        if ( nIndex < m_pImpl->m_aResults.size() )
        {
            uno::Reference< ucb::XContent > xContent
                                    = m_pImpl->m_aResults[ nIndex ].xContent;
            if ( xContent.is() )
            {
                // Already cached.
                return xContent;
            }
        }

        uno::Reference< ucb::XContentIdentifier > xId
            = queryContentIdentifier( nIndex );
        if ( xId.is() )
        {
            try
            {
                uno::Reference< ucb::XContent > xContent
                    = m_pImpl->m_xContent->getProvider()->queryContent( xId );
                m_pImpl->m_aResults[ nIndex ].xContent = xContent;
                return xContent;

            }
            catch ( ucb::IllegalIdentifierException const & )
            {
            }
        }
        return uno::Reference< ucb::XContent >();
    }

    // virtual
    bool ResultSetDataSupplier::getResult( sal_uInt32 nIndex )
    {
        osl::ClearableGuard< osl::Mutex > aGuard( m_pImpl->m_aMutex );

        if ( m_pImpl->m_aResults.size() > nIndex )
        {
            // Result already present.
            return true;
        }

        // Result not (yet) present.

        if ( m_pImpl->m_bCountFinal )
            return false;

        // Try to obtain result...

        sal_uInt32 nOldCount = m_pImpl->m_aResults.size();
        bool bFound = false;

        if ( queryNamesOfChildren() )
        {
            for ( sal_uInt32 n = nOldCount;
                  n < sal::static_int_cast<sal_uInt32>(
                          m_pImpl->m_pNamesOfChildren->getLength());
                  ++n )
            {
                const OUString & rName
                    = m_pImpl->m_pNamesOfChildren->getConstArray()[ n ];

                if ( rName.isEmpty() )
                {
                    OSL_FAIL( "ResultDataSupplier::getResult - Empty name!" );
                    break;
                }

                // Assemble URL for child.
                OUString aURL = assembleChildURL( rName );

                m_pImpl->m_aResults.emplace_back( aURL );

                if ( n == nIndex )
                {
                    // Result obtained.
                    bFound = true;
                    break;
                }
            }
        }

        if ( !bFound )
            m_pImpl->m_bCountFinal = true;

        rtl::Reference< ::ucbhelper::ResultSet > xResultSet = getResultSet().get();
        if ( xResultSet.is() )
        {
            // Callbacks follow!
            aGuard.clear();

            if ( nOldCount < m_pImpl->m_aResults.size() )
                xResultSet->rowCountChanged( nOldCount, m_pImpl->m_aResults.size() );

            if ( m_pImpl->m_bCountFinal )
                xResultSet->rowCountFinal();
        }

        return bFound;
    }

    // virtual
    sal_uInt32 ResultSetDataSupplier::totalCount()
    {
        osl::ClearableGuard< osl::Mutex > aGuard( m_pImpl->m_aMutex );

        if ( m_pImpl->m_bCountFinal )
            return m_pImpl->m_aResults.size();

        sal_uInt32 nOldCount = m_pImpl->m_aResults.size();

        if ( queryNamesOfChildren() )
        {
            for ( sal_uInt32 n = nOldCount;
                  n < sal::static_int_cast<sal_uInt32>(
                          m_pImpl->m_pNamesOfChildren->getLength());
                  ++n )
            {
                const OUString & rName
                    = m_pImpl->m_pNamesOfChildren->getConstArray()[ n ];

                if ( rName.isEmpty() )
                {
                    OSL_FAIL( "ResultDataSupplier::getResult - Empty name!" );
                    break;
                }

                // Assemble URL for child.
                OUString aURL = assembleChildURL( rName );

                m_pImpl->m_aResults.emplace_back( aURL );
            }
        }

        m_pImpl->m_bCountFinal = true;

        rtl::Reference< ::ucbhelper::ResultSet > xResultSet = getResultSet().get();
        if ( xResultSet.is() )
        {
            // Callbacks follow!
            aGuard.clear();

            if ( nOldCount < m_pImpl->m_aResults.size() )
                xResultSet->rowCountChanged( nOldCount, m_pImpl->m_aResults.size() );

            xResultSet->rowCountFinal();
        }

        return m_pImpl->m_aResults.size();
    }

    // virtual
    sal_uInt32 ResultSetDataSupplier::currentCount()
    {
        return m_pImpl->m_aResults.size();
    }

    // virtual
    bool ResultSetDataSupplier::isCountFinal()
    {
        return m_pImpl->m_bCountFinal;
    }

    // virtual
    uno::Reference< sdbc::XRow >
    ResultSetDataSupplier::queryPropertyValues( sal_uInt32 nIndex  )
    {
        osl::Guard< osl::Mutex > aGuard( m_pImpl->m_aMutex );

        if ( nIndex < m_pImpl->m_aResults.size() )
        {
            uno::Reference< sdbc::XRow > xRow = m_pImpl->m_aResults[ nIndex ].xRow;
            if ( xRow.is() )
            {
                // Already cached.
                return xRow;
            }
        }

        if ( getResult( nIndex ) )
        {
            uno::Reference< sdbc::XRow > xRow = Content::getPropertyValues(
                            m_pImpl->m_xContext,
                            getResultSet()->getProperties(),
                            m_pImpl->m_xContent->getContentProvider().get(),
                            queryContentIdentifierString( nIndex ) );
            m_pImpl->m_aResults[ nIndex ].xRow = xRow;
            return xRow;
        }

        return uno::Reference< sdbc::XRow >();
    }

    // virtual
    void ResultSetDataSupplier::releasePropertyValues( sal_uInt32 nIndex )
    {
        osl::Guard< osl::Mutex > aGuard( m_pImpl->m_aMutex );

        if ( nIndex < m_pImpl->m_aResults.size() )
            m_pImpl->m_aResults[ nIndex ].xRow.clear();
    }

    // virtual
    void ResultSetDataSupplier::close()
    {
    }

    // virtual
    void ResultSetDataSupplier::validate()
    {
        if ( m_pImpl->m_bThrowException )
            throw ucb::ResultSetException();
    }

    bool ResultSetDataSupplier::queryNamesOfChildren()
    {
        osl::Guard< osl::Mutex > aGuard( m_pImpl->m_aMutex );

        if ( m_pImpl->m_pNamesOfChildren == nullptr )
        {
            std::unique_ptr<uno::Sequence< OUString >> pNamesOfChildren(
                new uno::Sequence< OUString >() );

            if ( !m_pImpl->m_xContent->getContentProvider()->queryNamesOfChildren(
                    m_pImpl->m_xContent->getIdentifier()->getContentIdentifier(),
                    *pNamesOfChildren ) )
            {
                OSL_FAIL( "Got no list of children!" );
                m_pImpl->m_bThrowException = true;
                return false;
            }
            else
            {
                m_pImpl->m_pNamesOfChildren = std::move( pNamesOfChildren );
            }
        }
        return true;
    }

    OUString
    ResultSetDataSupplier::assembleChildURL( const OUString& aName )
    {
        OUString aContURL
            = m_pImpl->m_xContent->getIdentifier()->getContentIdentifier();
        OUString aURL( aContURL );

        sal_Int32 nUrlEnd = aURL.lastIndexOf( '/' );
        if ( nUrlEnd != aURL.getLength() - 1 )
            aURL += "/";

        aURL += aName;
        return aURL;
    }

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

↑ V758 The 'rName' reference becomes invalid when temporary object returned by a function is destroyed.

↑ V758 The 'rName' reference becomes invalid when temporary object returned by a function is destroyed.