/**************************************************************
 * 
 * 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 _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;
    sal_uInt16 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; }
    sal_uInt16& GetLockCount() { return nLockCount; }
    SwLayCacheImpl *LockImpl()
        { if( nLockCount & 0x8000 ) return NULL;
          if ( pImpl )
            ++nLockCount;
          return pImpl; }
    void UnlockImpl() { --nLockCount; }

#ifdef DBG_UTIL
    sal_Bool CompareLayout( const SwDoc& rDoc ) const;
#endif
};

#endif