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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
#ifndef INCLUDED_TOOLS_PSTM_HXX
#define INCLUDED_TOOLS_PSTM_HXX
#include <tools/toolsdllapi.h>
#include <tools/unqidx.hxx>
#include <tools/ref.hxx>
#include <tools/rtti.hxx>
#include <tools/stream.hxx>
#include <map>
#include <unordered_map>
#define ERRCODE_IO_NOFACTORY ERRCODE_IO_WRONGFORMAT
class SvPersistBase;
typedef void * (*SvCreateInstancePersist)( SvPersistBase ** );
#define SV_CLASS_REGISTER( Class ) \
Register( Class::StaticClassId(), Class::CreateInstance )
class TOOLS_DLLPUBLIC SvClassManager
{
typedef std::unordered_map<sal_Int32, SvCreateInstancePersist> Map;
Map aAssocTable;
public:
void Register( sal_Int32 nClassId, SvCreateInstancePersist pFunc );
SvCreateInstancePersist Get( sal_Int32 nClassId );
};
class TOOLS_DLLPUBLIC SvRttiBase : public SvRefBase
{
public:
TYPEINFO();
};
typedef tools::SvRef<SvRttiBase> SvRttiBaseRef;
#define SV_DECL_PERSIST( Class, CLASS_ID ) \
TYPEINFO_OVERRIDE(); \
static sal_Int32 StaticClassId() { return CLASS_ID; } \
static void * CreateInstance( SvPersistBase ** ppBase ); \
friend SvPersistStream& operator >> ( SvPersistStream & rStm, \
Class *& rpObj); \
virtual sal_Int32 GetClassId() const SAL_OVERRIDE; \
virtual void Load( SvPersistStream & ) SAL_OVERRIDE; \
virtual void Save( SvPersistStream & ) SAL_OVERRIDE;
#define SV_DECL_PERSIST1( Class, Super1, CLASS_ID ) \
SV_DECL_PERSIST( Class, CLASS_ID )
#define PRV_SV_IMPL_PERSIST( Class ) \
void * Class::CreateInstance( SvPersistBase ** ppBase )\
{ \
Class * p = new Class(); \
*ppBase = p; \
return p; \
} \
sal_Int32 Class::GetClassId() const \
{ return StaticClassId(); } \
SvPersistStream& operator >> (SvPersistStream & rStm, Class *& rpObj)\
{ \
SvPersistBase * pObj; \
rStm >> pObj; \
rpObj = PTR_CAST( Class, pObj ); \
return rStm; \
}
#define SV_IMPL_PERSIST1( Class, Super1 ) \
TYPEINIT1( Class, Super1 ) \
PRV_SV_IMPL_PERSIST( Class )
class SvPersistStream;
class SvPersistBase : public SvRttiBase
{
public:
virtual sal_Int32 GetClassId() const = 0;
virtual void Load( SvPersistStream & ) = 0;
virtual void Save( SvPersistStream & ) = 0;
TOOLS_DLLPUBLIC friend SvPersistStream& operator >> ( SvPersistStream & rStm,
SvPersistBase *& rpObj );
};
typedef UniqueIndex<SvPersistBase> SvPersistUIdx;
typedef std::map<SvPersistBase*, sal_uIntPtr> PersistBaseMap;
class SvStream;
/** Persistent Stream
This class provides accessor to storing and loading runtime objects.
All dependent objects have to be stored as well.
In order to load objects automatically, every object class must
provide a Factory method to read an object from stream.
The list of all classes is stored in a <SvClassManager> object
and is sent to SvPersistStream upon initialization.
By using the Method SvPersistStream::WriteCompressed and
SvPersistStream::ReadCompressed, compressed sal_uInt32 values may be
written to / read from the Stream.
Several helper methods exists for writing and reading
object lengths to the stream: SvPersistStream::WriteDummyLen,
SvPersistStream::WriteLen and SvPersistStream::ReadLen.
[Example]
One example is described in the constructor.
Assume a ring-like dependency, where A referenes B,
B itself references C, and C references to both D and A.
The order of the objects upon saving and loading does not matter,
as long objects are loaded in the same order they were stored.
Saving: Loading:
A,B,C,D A,B,C,D correct
B,A,C,D B,A,C,D correct
C,A,B,D A,B,C,D wrong
A,B,C,D A,B,C wrong
@note The file formats DBG_UTIL and !DBG_UTIL differ, but we can read from
both versions.
*/
class TOOLS_DLLPUBLIC SvPersistStream : public SvStream
{
SvClassManager & rClassMgr;
SvStream * pStm;
PersistBaseMap aPTable; // reversed pointer and key
SvPersistUIdx aPUIdx;
sal_uIntPtr nStartIdx;
const SvPersistStream * pRefStm;
sal_uInt32 nFlags;
virtual sal_uIntPtr GetData( void* pData, sal_uIntPtr nSize ) SAL_OVERRIDE;
virtual sal_uIntPtr PutData( const void* pData, sal_uIntPtr nSize ) SAL_OVERRIDE;
virtual sal_uInt64 SeekPos(sal_uInt64 nPos) SAL_OVERRIDE;
virtual void FlushData() SAL_OVERRIDE;
protected:
void WriteObj( sal_uInt8 nHdr, SvPersistBase * pObj );
sal_uInt32 ReadObj( SvPersistBase * & rpObj, bool bRegister );
public:
bool IsStreamed( SvPersistBase * pObj ) const
{ return 0 != GetIndex( pObj ); }
virtual void ResetError() SAL_OVERRIDE;
SvPersistStream( SvClassManager &, SvStream * pStream,
sal_uInt32 nStartIdx = 1 );
virtual ~SvPersistStream();
void SetStream( SvStream * pStream );
SvStream * GetStream() const { return pStm; }
SvPersistBase * GetObject( sal_uIntPtr nIdx ) const;
sal_uIntPtr GetIndex( SvPersistBase * ) const;
void SetContextFlags( sal_uInt32 n ) { nFlags = n; }
sal_uInt32 GetContextFlags() const { return nFlags; }
static void WriteCompressed( SvStream & rStm, sal_uInt32 nVal );
static sal_uInt32 ReadCompressed( SvStream & rStm );
sal_uInt32 WriteDummyLen();
void WriteLen( sal_uInt32 nLenPos );
sal_uInt32 ReadLen( sal_uInt32 * pTestPos );
SvPersistStream& WritePointer( SvPersistBase * pObj );
SvPersistStream& ReadPointer( SvPersistBase * & rpObj );
TOOLS_DLLPUBLIC friend SvPersistStream& WriteSvPersistBase(SvPersistStream &, SvPersistBase *);
TOOLS_DLLPUBLIC friend SvPersistStream& operator >> (SvPersistStream &, SvPersistBase * &);
// Objects maintain their IDs while storing and loading to/from stream
friend SvStream& operator >> ( SvStream &, SvPersistStream & );
friend SvStream& WriteSvPersistStream( SvStream &, SvPersistStream & );
};
#endif
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