/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * 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 .
 */
 
#pragma once
 
#include <cppuhelper/propshlp.hxx>
#include <osl/diagnose.h>
#include <osl/mutex.hxx>
 
namespace connectivity::firebird
{
    /// @throws css::lang::DisposedException
    void checkDisposed(bool _bThrow);
 
 
    template <class TYPE>
    class OPropertyArrayUsageHelper
    {
    protected:
        static sal_Int32                        s_nRefCount;
        static ::cppu::IPropertyArrayHelper*    s_pProps;
        static ::osl::Mutex                     s_aMutex;
 
    public:
        OPropertyArrayUsageHelper();
        virtual ~OPropertyArrayUsageHelper();
 
        /** call this in the getInfoHelper method of your derived class. The method returns the array helper of the
            class, which is created if necessary.
        */
        ::cppu::IPropertyArrayHelper*   getArrayHelper();
 
    protected:
        /** used to implement the creation of the array helper which is shared amongst all instances of the class.
            This method needs to be implemented in derived classes.
            <BR>
            The method gets called with s_aMutex acquired.
            @return                         a pointer to the newly created array helper. Must not be NULL.
        */
        virtual ::cppu::IPropertyArrayHelper* createArrayHelper( ) const = 0;
    };
 
    template<class TYPE>
    sal_Int32                       OPropertyArrayUsageHelper< TYPE >::s_nRefCount  = 0;
 
    template<class TYPE>
    ::cppu::IPropertyArrayHelper*   OPropertyArrayUsageHelper< TYPE >::s_pProps = nullptr;
 
    template<class TYPE>
    ::osl::Mutex                    OPropertyArrayUsageHelper< TYPE >::s_aMutex;
 
 
    template <class TYPE>
    OPropertyArrayUsageHelper<TYPE>::OPropertyArrayUsageHelper()
    {
        ::osl::MutexGuard aGuard(s_aMutex);
        ++s_nRefCount;
    }
 
 
    template <class TYPE>
    OPropertyArrayUsageHelper<TYPE>::~OPropertyArrayUsageHelper()
    {
        ::osl::MutexGuard aGuard(s_aMutex);
        OSL_ENSURE(s_nRefCount > 0, "OPropertyArrayUsageHelper::~OPropertyArrayUsageHelper : suspicious call : have a refcount of 0 !");
        if (!--s_nRefCount)
        {
            delete s_pProps;
            s_pProps = nullptr;
        }
    }
 
 
    template <class TYPE>
    ::cppu::IPropertyArrayHelper* OPropertyArrayUsageHelper<TYPE>::getArrayHelper()
    {
        OSL_ENSURE(s_nRefCount, "OPropertyArrayUsageHelper::getArrayHelper : suspicious call : have a refcount of 0 !");
        if (!s_pProps)
        {
            ::osl::MutexGuard aGuard(s_aMutex);
            if (!s_pProps)
            {
                s_pProps = createArrayHelper();
                OSL_ENSURE(s_pProps, "OPropertyArrayUsageHelper::getArrayHelper : createArrayHelper returned nonsense !");
            }
        }
        return s_pProps;
    }
 
}
 
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