/* -*- 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 <com/sun/star/frame/DoubleInitializationException.hpp>
#include <com/sun/star/lang/IllegalArgumentException.hpp>
#include <com/sun/star/uno/XComponentContext.hpp>
#include <cppuhelper/supportsservice.hxx>

#include "documentiologring.hxx"
#include <rtl/ref.hxx>

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

namespace comphelper
{


OSimpleLogRing::OSimpleLogRing()
: m_aMessages( SIMPLELOGRING_SIZE )
, m_bInitialized( false )
, m_bFull( false )
, m_nPos( 0 )
{
}


OSimpleLogRing::~OSimpleLogRing()
{
}

// XSimpleLogRing

void SAL_CALL OSimpleLogRing::logString( const OUString& aMessage ) throw (uno::RuntimeException, std::exception)
{
    ::osl::MutexGuard aGuard( m_aMutex );

    m_aMessages[m_nPos] = aMessage;
    if ( ++m_nPos >= (sal_Int32)m_aMessages.size() )
    {
        m_nPos = 0;
        m_bFull = true;
    }

    // if used once then default initialized
    m_bInitialized = true;
}


uno::Sequence< OUString > SAL_CALL OSimpleLogRing::getCollectedLog() throw (uno::RuntimeException, std::exception)
{
    ::osl::MutexGuard aGuard( m_aMutex );

    sal_Int32 nResLen = m_bFull ? m_aMessages.size() : m_nPos;
    sal_Int32 nStart = m_bFull ? m_nPos : 0;
    uno::Sequence< OUString > aResult( nResLen );

    for ( sal_Int32 nInd = 0; nInd < nResLen; nInd++ )
        aResult[nInd] = m_aMessages[ ( nStart + nInd ) % m_aMessages.size() ];

    // if used once then default initialized
    m_bInitialized = true;

    return aResult;
}

// XInitialization

void SAL_CALL OSimpleLogRing::initialize( const uno::Sequence< uno::Any >& aArguments ) throw (uno::Exception, uno::RuntimeException, std::exception)
{
    ::osl::MutexGuard aGuard( m_aMutex );
    if ( m_bInitialized )
        throw frame::DoubleInitializationException();

    if ( !m_refCount )
        throw uno::RuntimeException(); // the object must be refcounted already!

    if (aArguments.hasElements())
    {
        sal_Int32 nLen = 0;
        if ( aArguments.getLength() == 1 && ( aArguments[0] >>= nLen ) && nLen )
            m_aMessages.resize( nLen );
        else
            throw lang::IllegalArgumentException(
                "Nonnull size is expected as the first argument!",
                uno::Reference< uno::XInterface >(),
                0 );
    }

    m_bInitialized = true;
}

// XServiceInfo
OUString SAL_CALL OSimpleLogRing::getImplementationName() throw (uno::RuntimeException, std::exception)
{
    return OUString("com.sun.star.comp.logging.SimpleLogRing");
}

sal_Bool SAL_CALL OSimpleLogRing::supportsService( const OUString& aServiceName ) throw (uno::RuntimeException, std::exception)
{
    return cppu::supportsService(this, aServiceName);
}

uno::Sequence< OUString > SAL_CALL OSimpleLogRing::getSupportedServiceNames() throw (uno::RuntimeException, std::exception)
{
    return { "com.sun.star.logging.SimpleLogRing" };
}

} // namespace comphelper

namespace {

struct Instance {
    explicit Instance():
        instance(new comphelper::OSimpleLogRing())
    {}

    rtl::Reference<cppu::OWeakObject> instance;
};

struct Singleton:
    public rtl::Static<Instance, Singleton>
{};

}

extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface * SAL_CALL
com_sun_star_comp_logging_SimpleLogRing(
    css::uno::XComponentContext *,
    css::uno::Sequence<css::uno::Any> const &)
{
    return cppu::acquire(Singleton::get().instance.get());
}

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