/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2008 by Sun Microsystems, Inc.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * $RCSfile: laycache.hxx,v $
 * $Revision: 1.5 $
 *
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 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
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 * version 3 along with OpenOffice.org.  If not, see
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 ************************************************************************/
#ifndef _LAYCACHE_HXX
#define _LAYCACHE_HXX

#include <tools/solar.h>

class SwDoc;
class SwLayCacheImpl;
class SvStream;

/*************************************************************************
 *                      class SwLayoutCache
 *
 * This class allows to save layout information in the file and it contains
 * this information after loading of a file.
 * Call Write(..) with a stream and the document to save and the page break
 * information of the document will be written.
 * Call Read(..) with a stream and the member pLayCacheImpl will
 * read the information from the stream and store it in an internal structur.
 * There's a simple locking mechanism at these classes,
 * if somebody reads the information, he increments the lock count by 1,
 * during the Read(..) function the lock count will set to $8000.
 *
 **************************************************************************/

class SwLayoutCache
{
    SwLayCacheImpl *pImpl;
    USHORT nLockCount;
public:
    SwLayoutCache() : pImpl( NULL ), nLockCount( 0 ) {}
    ~SwLayoutCache();

    void Read( SvStream &rStream );
    void Write( SvStream &rStream, const SwDoc& rDoc );

    void ClearImpl();
    sal_Bool IsLocked() const { return nLockCount > 0; }
    USHORT& GetLockCount() { return nLockCount; }
    SwLayCacheImpl *LockImpl()
        { if( nLockCount & 0x8000 ) return NULL;
          if ( pImpl )
            ++nLockCount;
          return pImpl; }
    void UnlockImpl() { --nLockCount; }

#ifndef PRODUCT
    sal_Bool CompareLayout( const SwDoc& rDoc ) const;
#endif
};

#endif