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/*
* Copyright (C) 2008-2009 Patrick Ohly <patrick.ohly@gmx.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef INCL_EVOLUTION_DATA_BLOB
# define INCL_EVOLUTION_DATA_BLOB
#include <iostream>
#include <boost/shared_ptr.hpp>
#include <syncevo/declarations.h>
SE_BEGIN_CXX
/**
* Abstract base class for a chunk of data.
* Can be opened for reading and writing.
* Meant to be used for plain files and
* for sections inside a larger file.
*/
class DataBlob
{
public:
virtual ~DataBlob() {}
/**
* Create stream for writing data.
* Always overwrites old data.
*/
virtual boost::shared_ptr<std::ostream> write() = 0;
/**
* Create stream for reading data.
*/
virtual boost::shared_ptr<std::istream> read() = 0;
/** some kind of user visible name for the data */
virtual std::string getName() const = 0;
/** true if the data exists already */
virtual bool exists() const = 0;
/** true if the data is read-only and write() will fail */
virtual bool isReadonly() const = 0;
};
SE_END_CXX
#endif // INCL_EVOLUTION_DATA_BLOB
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