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124 lines
3.4 KiB
C++
124 lines
3.4 KiB
C++
//
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// BLOBStream.h
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//
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// $Id: //poco/Main/Data/include/Poco/Data/BLOBStream.h#3 $
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//
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// Library: Data
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// Package: DataCore
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// Module: BLOBStream
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//
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// Definition of the BLOBStream class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Data_BLOBStream_INCLUDED
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#define Data_BLOBStream_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/UnbufferedStreamBuf.h"
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#include "Poco/Data/BLOB.h"
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#include <istream>
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#include <ostream>
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namespace Poco {
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namespace Data {
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class Data_API BLOBStreamBuf: public UnbufferedStreamBuf
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/// This is the streambuf class used for reading from and writing to a BLOB.
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{
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public:
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BLOBStreamBuf(BLOB& blob);
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/// Creates BLOBStreamBuf.
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~BLOBStreamBuf();
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/// Destroys BLOBStreamBuf.
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protected:
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int_type readFromDevice();
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int_type writeToDevice(char c);
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private:
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BLOB& _blob;
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BLOB::Iterator _it;
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};
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class Data_API BLOBIOS: public virtual std::ios
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/// The base class for BLOBInputStream and
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/// BLOBOutputStream.
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///
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/// This class is needed to ensure the correct initialization
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/// order of the stream buffer and base classes.
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{
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public:
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BLOBIOS(BLOB& blob, openmode mode);
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/// Creates the BLOBIOS with the given BLOB.
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~BLOBIOS();
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/// Destroys the BLOBIOS.
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BLOBStreamBuf* rdbuf();
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/// Returns a pointer to the internal BLOBStreamBuf.
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protected:
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BLOBStreamBuf _buf;
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};
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class Data_API BLOBOutputStream: public BLOBIOS, public std::ostream
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/// An output stream for writing to a BLOB.
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{
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public:
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BLOBOutputStream(BLOB& blob);
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/// Creates the BLOBOutputStream with the given BLOB.
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~BLOBOutputStream();
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/// Destroys the BLOBOutputStream.
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};
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class Data_API BLOBInputStream: public BLOBIOS, public std::istream
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/// An input stream for reading from a BLOB.
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{
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public:
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BLOBInputStream(BLOB& blob);
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/// Creates the BLOBInputStream with the given BLOB.
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~BLOBInputStream();
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/// Destroys the BLOBInputStream.
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};
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} } // namespace Poco::Data
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#endif // Data_BLOBStream_INCLUDED
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