/**************************************************************
 * 
 * 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
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 *************************************************************/



#ifndef _VOS_REFERNCE_HXX_
#define _VOS_REFERNCE_HXX_

#	include <vos/types.hxx>
#	include <osl/interlck.h>
#	include <vos/object.hxx>
#	include <vos/vosdllapi.h>

namespace vos
{

/** Interface for refernce-counting
*/
class IReference
{
public:

    IReference() { }
    virtual ~IReference() { }
    
	typedef oslInterlockedCount RefCount;

	virtual RefCount SAL_CALL acquire()=0;
	virtual RefCount SAL_CALL release()=0;

	virtual RefCount SAL_CALL referenced() const=0;
};

class VOS_DLLPUBLIC ORefCount
{
public:
	typedef IReference::RefCount RefCount;

	ORefCount() { m_RefCount = 0; }
	ORefCount(RefCount n) { m_RefCount = n; }
    virtual ~ORefCount();
    
	RefCount SAL_CALL acquire() { return (osl_incrementInterlockedCount(&m_RefCount)); };
	RefCount SAL_CALL release() { return (osl_decrementInterlockedCount(&m_RefCount)); };

	RefCount SAL_CALL operator++() 	 { return acquire(); }
	// don't implement the postfix operator, it won't function this way!

	RefCount SAL_CALL operator--() 	 { return release(); }
	// don't implement the postfix operator, it won't function this way!

	RefCount SAL_CALL referenced() const
		{ return (m_RefCount); }

protected:
	RefCount m_RefCount;

private:
	// disable copy/assignment
	ORefCount(const ORefCount&);
	ORefCount& SAL_CALL operator= (const ORefCount&);
};

class VOS_DLLPUBLIC OReference : public vos::IReference
{
public:
	OReference();
	virtual ~OReference();

	virtual RefCount SAL_CALL acquire();
	virtual RefCount SAL_CALL release();

	virtual RefCount SAL_CALL referenced() const
		{ return (m_RefCount.referenced()); }

protected:
	ORefCount m_RefCount;

private:
	// disable copy/assignment
	OReference(const OReference&);
	OReference& SAL_CALL operator= (const OReference&);
};

}

#endif	// _VOS_REFERNCE_HXX_