/**************************************************************
 * 
 * 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 _STORE_LOCKBYTE_HXX_
#define _STORE_LOCKBYTE_HXX_

#ifndef _SAL_TYPES_H_
#include "sal/types.h"
#endif

#ifndef _RTL_REF_HXX_
#include "rtl/ref.hxx"
#endif
#ifndef _RTL_USTRING_H_
#include "rtl/ustring.h"
#endif

#ifndef _STORE_TYPES_H_
#include "store/types.h"
#endif
#ifndef _STORE_STORBASE_HXX_
#include "storbase.hxx"
#endif

namespace store
{

/*========================================================================
 *
 * ILockBytes interface.
 *
 *======================================================================*/
class ILockBytes : public rtl::IReference
{
public:
    /**
        @param  rxAllocator [out]
        @param  nPageSize [in]
    */
    storeError initialize (
        rtl::Reference< PageData::Allocator > & rxAllocator,
        sal_uInt16                              nPageSize);

    /**
	    @param  rPage [out]
	    @param  nOffset [in]
     */
    storeError readPageAt (
        PageHolder & rPage,
        sal_uInt32   nOffset);

    /**
	    @param  rPage [in]
	    @param  nOffset [in]
     */
    storeError writePageAt (
        PageHolder const & rPage,
        sal_uInt32         nOffset);

	/**
	    @param  nOffset [in]
	    @param  pBuffer [out]
	    @param  nBytes [in]
	    @return store_E_None upon success
	 */
	storeError readAt (
		sal_uInt32  nOffset,
		void       *pBuffer,
		sal_uInt32  nBytes);

	/**
	    @param  nOffset [in]
	    @param  pBuffer [in]
	    @param  nBytes [in]
	    @return store_E_None upon success
	 */
	storeError writeAt (
		sal_uInt32  nOffset,
		const void *pBuffer,
		sal_uInt32  nBytes);

	/**
	    @param  rnSize [out]
	    @return store_E_None upon success
	 */
	storeError getSize (sal_uInt32 & rnSize);

	/**
	    @param  nSize [in]
	    @return store_E_None upon success
	 */
	storeError setSize (sal_uInt32 nSize);

	/**
	    @return store_E_None upon success
	 */
	storeError flush();

private:
    /** Implementation (abstract).
     */
    virtual storeError initialize_Impl (
        rtl::Reference< PageData::Allocator > & rxAllocator,
        sal_uInt16                              nPageSize) = 0;

    virtual storeError readPageAt_Impl (
        PageHolder & rPage,
        sal_uInt32   nOffset) = 0;

    virtual storeError writePageAt_Impl (
        PageHolder const & rPage,
        sal_uInt32         nOffset) = 0;

	virtual storeError readAt_Impl (
		sal_uInt32  nOffset,
		void       *pBuffer,
		sal_uInt32  nBytes) = 0;

	virtual storeError writeAt_Impl (
		sal_uInt32  nOffset,
		const void *pBuffer,
		sal_uInt32  nBytes) = 0;

	virtual storeError getSize_Impl (
        sal_uInt32 & rnSize) = 0;

	virtual storeError setSize_Impl (
        sal_uInt32 nSize) = 0;

	virtual storeError flush_Impl() = 0;
};

/*========================================================================
 *
 * ILockBytes factories.
 *
 *======================================================================*/

storeError
FileLockBytes_createInstance (
  rtl::Reference< store::ILockBytes > & rxLockBytes,
  rtl_uString *   pFilename,
  storeAccessMode eAccessMode
);

storeError
MemoryLockBytes_createInstance (
  rtl::Reference< store::ILockBytes > & rxLockBytes
);

/*========================================================================
 *
 * The End.
 *
 *======================================================================*/

} // namespace store

#endif /* !_STORE_LOCKBYTE_HXX_ */