Quelle  DirectoryStream.cxx   Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* writerperfect
 * Version: MPL 2.0 / LGPLv2.1+
 *
 * 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/.
 *
 * Major Contributor(s):
 * Copyright (C) 2007 Fridrich Strba (fridrich.strba@bluewin.ch)
 *
 * For minor contributions see the git repository.
 *
 * Alternatively, the contents of this file may be used under the terms
 * of the GNU Lesser General Public License Version 2.1 or later
 * (LGPLv2.1+), in which case the provisions of the LGPLv2.1+ are
 * applicable instead of those above.
 *
 * For further information visit http://libwpd.sourceforge.net
 */

#include <memory>
#include <com/sun/star/container/XChild.hpp>
#include <com/sun/star/io/XInputStream.hpp>
#include <com/sun/star/sdbc/XResultSet.hpp>
#include <com/sun/star/sdbc/XRow.hpp>
#include <com/sun/star/ucb/XContent.hpp>
#include <com/sun/star/ucb/XContentAccess.hpp>
#include <com/sun/star/ucb/XCommandEnvironment.hpp>

#include <com/sun/star/uno/Reference.hxx>
#include <com/sun/star/uno/Sequence.hxx>

#include <comphelper/processfactory.hxx>

#include <rtl/ustring.hxx>

#include <ucbhelper/content.hxx>

#include <DirectoryStream.hxx>
#include <WPXSvInputStream.hxx>
#include <utility>

namespace io = css::io;
namespace sdbc = css::sdbc;
namespace ucb = css::ucb;
namespace uno = css::uno;

namespace writerperfect
{
namespace
{
uno::Reference<io::XInputStream> findStream(ucbhelper::Content& rContent, std::u16string_view rName)
{
    uno::Reference<io::XInputStream> xInputStream;

    uno::Sequence<OUString> lPropNames{ u"Title"_ustr };
    try
    {
        const uno::Reference<sdbc::XResultSet> xResultSet(
            rContent.createCursor(lPropNames, ucbhelper::INCLUDE_DOCUMENTS_ONLY));
        if (!xResultSet->first())
            return xInputStream;

        const uno::Reference<ucb::XContentAccess> xContentAccess(xResultSet, uno::UNO_QUERY);
        if (!xContentAccess)
            return xInputStream;
        const uno::Reference<sdbc::XRow> xRow(xResultSet, uno::UNO_QUERY);
        if (!xRow)
            return xInputStream;
        do
        {
            const OUString aTitle(xRow->getString(1));
            if (aTitle == rName)
            {
                const uno::Reference<ucb::XContent> xSubContent(xContentAccess->queryContent());
                ucbhelper::Content aSubContent(xSubContent,
                                               uno::Reference<ucb::XCommandEnvironment>(),
                                               comphelper::getProcessComponentContext());
                xInputStream = aSubContent.openStream();
                break;
            }
        } while (xResultSet->next());
    }
    catch (const uno::RuntimeException&)
    {
        // ignore
    }
    catch (const uno::Exception&)
    {
        // ignore
    }

    return xInputStream;
}
}

struct DirectoryStream::Impl
{
    explicit Impl(uno::Reference<ucb::XContent> xContent);

    uno::Reference<ucb::XContent> xContent;
};

DirectoryStream::Impl::Impl(uno::Reference<ucb::XContent> _xContent)
    : xContent(std::move(_xContent))
{
}

DirectoryStream::DirectoryStream(const css::uno::Reference<css::ucb::XContent>& xContent)
    : m_pImpl(isDirectory(xContent) ? new Impl(xContent) : nullptr)
{
}

DirectoryStream::~DirectoryStream() {}

bool DirectoryStream::isDirectory(const css::uno::Reference<css::ucb::XContent>& xContent)
{
    try
    {
        if (!xContent.is())
            return false;

        ucbhelper::Content aContent(xContent, uno::Reference<ucb::XCommandEnvironment>(),
                                    comphelper::getProcessComponentContext());
        return aContent.isFolder();
    }
    catch (...)
    {
        return false;
    }
}

std::unique_ptr<DirectoryStream>
DirectoryStream::createForParent(const css::uno::Reference<css::ucb::XContent>& xContent)
{
    try
    {
        if (!xContent.is())
            return nullptr;

        std::unique_ptr<DirectoryStream> pDir;

        const uno::Reference<css::container::XChild> xChild(xContent, uno::UNO_QUERY);
        if (xChild.is())
        {
            const uno::Reference<ucb::XContent> xDirContent(xChild->getParent(), uno::UNO_QUERY);
            if (xDirContent.is())
            {
                pDir = std::make_unique<DirectoryStream>(xDirContent);
                if (!pDir->isStructured())
                    pDir.reset();
            }
        }

        return pDir;
    }
    catch (...)
    {
        return nullptr;
    }
}

css::uno::Reference<css::ucb::XContent> DirectoryStream::getContent() const
{
    if (!m_pImpl)
        return css::uno::Reference<css::ucb::XContent>();
    return m_pImpl->xContent;
}

bool DirectoryStream::isStructured() { return m_pImpl != nullptr; }

unsigned DirectoryStream::subStreamCount()
{
    // TODO: implement me
    return 0;
}

const char* DirectoryStream::subStreamName(unsigned /* id */)
{
    // TODO: implement me
    return nullptr;
}

bool DirectoryStream::existsSubStream(const char* /* name */)
{
    // TODO: implement me
    return false;
}

librevenge::RVNGInputStream* DirectoryStream::getSubStreamByName(const char* const pName)
{
    if (!m_pImpl)
        return nullptr;

    ucbhelper::Content aContent(m_pImpl->xContent, uno::Reference<ucb::XCommandEnvironment>(),
                                comphelper::getProcessComponentContext());
    const uno::Reference<io::XInputStream> xInputStream(
        findStream(aContent, OUString::createFromAscii(pName)));
    if (xInputStream.is())
        return new WPXSvInputStream(xInputStream);

    return nullptr;
}

librevenge::RVNGInputStream* DirectoryStream::getSubStreamById(unsigned /* id */)
{
    // TODO: implement me
    return nullptr;
}

const unsigned char* DirectoryStream::read(unsigned long, unsigned long& nNumBytesRead)
{
    nNumBytesRead = 0;
    return nullptr;
}

int DirectoryStream::seek(long, librevenge::RVNG_SEEK_TYPE) { return -1; }

long DirectoryStream::tell() { return 0; }

bool DirectoryStream::isEnd() { return true; }
}

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