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/*
* Copyright (C) 2007-2008 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_ARCHIVE_H
#define BU_ARCHIVE_H
#include <stdint.h>
#include "bu/archivebase.h"
#include "bu/hash.h"
#include "bu/util.h"
namespace Bu
{
class Archival;
class Stream;
/**
* Provides a framework for serialization of objects and primitives. The
* archive will handle any basic primitive, a few special types, like char *
* strings, as well as STL classes and anything that inherits from the
* Archival class. Each Archive operates on a Stream, so you can send the
* data using an Archive almost anywhere.
*
* In order to use an Archive to store something to a file, try something
* like:
*@code
* File sOut("output", "wb"); // This is a stream subclass
* Archive ar( sOut, Archive::save );
* ar << myClass;
@endcode
* In this example myClass is any class that inherits from Archival. When
* the storage operator is called, the Archival::archive() function in the
* myClass object is called with a reference to the Archive. This can be
* handled in one of two ways:
*@code
* void MyClass::archive( Archive &ar )
* {
* ar && sName && nAge && sJob;
* }
@endcode
* Here we don't worry about weather we're loading or saving by using the
* smart && operator. This allows us to write very consistent, very simple
* archive functions that really do a lot of work. If we wanted to do
* something different in the case of loading or saving we would do:
*@code
* void MyClass::archive( Archive &ar )
* {
* if( ar.isLoading() )
* {
* ar >> sName >> nAge >> sJob;
* } else
* {
* ar << sName << nAge << sJob;
* }
* }
@endcode
* Archive currently does not provide facility to make fully portable
* archives. For example, it will not convert between endianness for you,
* nor will it take into account differences between primitive sizes on
* different platforms. This, at the moment, is up to the user to ensure.
* One way of dealing with the latter problem is to make sure and use
* explicit primitive types from the stdint.h header, i.e. int32_t.
*/
class Archive : public ArchiveBase
{
private:
bool bLoading;
public:
bool isLoading();
enum
{
load = true,
save = false
};
Archive( Stream &rStream, bool bLoading );
virtual ~Archive();
virtual void close();
virtual void write(const void *, int32_t);
virtual void read(void *, int32_t);
/**
* For storage, get an ID for the pointer to the object you're going to
* write.
*/
uint32_t getID( const void *ptr );
/**
* For loading. Assosiates an empty pointer with an id. When you wind
* up loading an id reference to a pointer for an object that may or
* may not have loaded yet, call this with the id, if it has been loaded
* already, you'll immediately get a pointer, if not, it will write one
* for you when the time comes.
*/
void assocPtrID( void **ptr, uint32_t id );
/**
* For loading. Call this when you load an object that other things may
* have pointers to. It will assosiate every pointer that's been
* registered with assocPtrID to the pointer passed in, and id passed
* in. It will also set things up so future calls to assocPtrID will
* automatically succeed immediately.
*/
void readID( const void *ptr, uint32_t id );
private:
Stream &rStream;
uint32_t nNextID;
Hash<uint32_t,uint32_t> hPtrID;
Hash<uint32_t,List<void **> > hPtrDest;
};
}
#endif
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