    /* -*- 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 "oinputstreamcontainer.hxx"
    #include <cppuhelper/typeprovider.hxx>
    #include <cppuhelper/queryinterface.hxx>

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

    OFSInputStreamContainer::OFSInputStreamContainer( const uno::Reference< io::XInputStream >& xStream )
    : m_xInputStream( xStream )
    , m_xSeekable( xStream, uno::UNO_QUERY )
    , m_bSeekable( false )
    , m_bDisposed( false )
    {
        m_bSeekable = m_xSeekable.is();
    }

    OFSInputStreamContainer::~OFSInputStreamContainer()
    {
    }

    uno::Sequence< uno::Type > SAL_CALL OFSInputStreamContainer::getTypes()
    {
        static ::cppu::OTypeCollection* pTypeCollection = nullptr ;

        if ( pTypeCollection == nullptr )
        {
            ::osl::MutexGuard aGuard( m_aMutex ) ;

            if ( pTypeCollection == nullptr )
            {
                if ( m_bSeekable )
                {
                    static ::cppu::OTypeCollection aTypeCollection(
                            cppu::UnoType<io::XStream>::get(),
                            cppu::UnoType<io::XInputStream>::get(),
                            cppu::UnoType<io::XSeekable>::get());

                    pTypeCollection = &aTypeCollection ;
                }
                else
                {
                    static ::cppu::OTypeCollection aTypeCollection(
                            cppu::UnoType<io::XStream>::get(),
                            cppu::UnoType<io::XInputStream>::get());

                    pTypeCollection = &aTypeCollection ;
                }
            }
        }

        return pTypeCollection->getTypes() ;

    }

    uno::Any SAL_CALL OFSInputStreamContainer::queryInterface( const uno::Type& rType )
    {
        // Attention:
        //  Don't use mutex or guard in this method!!! Is a method of XInterface.

        uno::Any aReturn;
        if ( m_bSeekable )
            aReturn = ::cppu::queryInterface( rType,
                                               static_cast< io::XStream* >( this ),
                                               static_cast< io::XInputStream* >( this ),
                                               static_cast< io::XSeekable* >( this ) );
        else
            aReturn = ::cppu::queryInterface( rType,
                                               static_cast< io::XStream* >( this ),
                                               static_cast< io::XInputStream* >( this ) );

        if ( aReturn.hasValue() )
            return aReturn ;

        return ::cppu::OWeakObject::queryInterface( rType ) ;
    }

    void SAL_CALL OFSInputStreamContainer::acquire()
            throw()
    {
        ::cppu::OWeakObject::acquire();
    }

    void SAL_CALL OFSInputStreamContainer::release()
            throw()
    {
        ::cppu::OWeakObject::release();
    }

    sal_Int32 SAL_CALL OFSInputStreamContainer::readBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xInputStream.is() )
            throw uno::RuntimeException();

        return m_xInputStream->readBytes( aData, nBytesToRead );
    }

    sal_Int32 SAL_CALL OFSInputStreamContainer::readSomeBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xInputStream.is() )
            throw uno::RuntimeException();

        return m_xInputStream->readSomeBytes( aData, nMaxBytesToRead );
    }

    void SAL_CALL OFSInputStreamContainer::skipBytes( sal_Int32 nBytesToSkip )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xInputStream.is() )
            throw uno::RuntimeException();

        m_xInputStream->skipBytes( nBytesToSkip );
    }

    sal_Int32 SAL_CALL OFSInputStreamContainer::available(  )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xInputStream.is() )
            throw uno::RuntimeException();

        return m_xInputStream->available();
    }

    void SAL_CALL OFSInputStreamContainer::closeInput(  )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xInputStream.is() )
            throw uno::RuntimeException();

        dispose();
    }

    uno::Reference< io::XInputStream > SAL_CALL OFSInputStreamContainer::getInputStream()
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xInputStream.is() )
            return uno::Reference< io::XInputStream >();

        return uno::Reference< io::XInputStream >( static_cast< io::XInputStream* >( this ), uno::UNO_QUERY );
    }

    uno::Reference< io::XOutputStream > SAL_CALL OFSInputStreamContainer::getOutputStream()
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        return uno::Reference< io::XOutputStream >();
    }

    void SAL_CALL OFSInputStreamContainer::seek( sal_Int64 location )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xSeekable.is() )
            throw uno::RuntimeException();

        m_xSeekable->seek( location );
    }

    sal_Int64 SAL_CALL OFSInputStreamContainer::getPosition()
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xSeekable.is() )
            throw uno::RuntimeException();

        return m_xSeekable->getPosition();
    }

    sal_Int64 SAL_CALL OFSInputStreamContainer::getLength()
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xSeekable.is() )
            throw uno::RuntimeException();

        return m_xSeekable->getLength();
    }

    void SAL_CALL OFSInputStreamContainer::dispose(  )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_xInputStream.is() )
            throw uno::RuntimeException();

        m_xInputStream->closeInput();

        if ( m_pListenersContainer )
        {
            lang::EventObject aSource( static_cast< ::cppu::OWeakObject*>( this ) );
            m_pListenersContainer->disposeAndClear( aSource );
        }

        m_bDisposed = true;
    }

    void SAL_CALL OFSInputStreamContainer::addEventListener( const uno::Reference< lang::XEventListener >& xListener )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( !m_pListenersContainer )
            m_pListenersContainer.reset( new ::comphelper::OInterfaceContainerHelper2( m_aMutex ) );

        m_pListenersContainer->addInterface( xListener );
    }

    void SAL_CALL OFSInputStreamContainer::removeEventListener( const uno::Reference< lang::XEventListener >& xListener )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if ( m_bDisposed )
            throw lang::DisposedException();

        if ( m_pListenersContainer )
            m_pListenersContainer->removeInterface( xListener );
    }

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

↑ V547 Expression 'pTypeCollection == nullptr' is always true.