/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



#ifndef _SALHELPER_REFOBJ_HXX_
#define _SALHELPER_REFOBJ_HXX_

#include <sal/types.h>
#include <rtl/alloc.h>
#include <rtl/ref.hxx>
#include <osl/diagnose.h>
#include <osl/interlck.h>

namespace salhelper
{

//----------------------------------------------------------------------------

class ReferenceObject : public rtl::IReference
{
	/** Representation.
	 */
	oslInterlockedCount m_nReferenceCount;

	/** Not implemented.
	 */
	ReferenceObject (const ReferenceObject&);
	ReferenceObject& operator= (const ReferenceObject&);

public:
	/** Allocation.
	 */
	static void* operator new (size_t n) SAL_THROW(())
	{
		return ::rtl_allocateMemory (n);
	}
	static void operator delete (void* p) SAL_THROW(())
	{
		::rtl_freeMemory (p);
	}
	static void* operator new (size_t, void* p) SAL_THROW(())
	{
		return (p);
	}
	static void operator delete (void*, void*) SAL_THROW(())
	{}

public:
	/** Construction.
	 */
	inline ReferenceObject() SAL_THROW(()) : m_nReferenceCount (0)
	{}


	/** IReference.
	 */
	virtual oslInterlockedCount SAL_CALL acquire() SAL_THROW(())
	{
		return ::osl_incrementInterlockedCount (&m_nReferenceCount);
	}

	virtual oslInterlockedCount SAL_CALL release() SAL_THROW(())
	{
		oslInterlockedCount result;
		result = ::osl_decrementInterlockedCount (&m_nReferenceCount);
		if (result == 0)
		{
			// Last reference released.
			delete this;
		}
		return (result);
	}

protected:
	/** Destruction.
	 */
	virtual ~ReferenceObject() SAL_THROW(())
	{
		OSL_ASSERT(m_nReferenceCount == 0);
	}
};
	
//----------------------------------------------------------------------------

} // namespace salhelper

#endif /* !_SALHELPER_REFOBJ_HXX_ */