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2025-09-01 20:47:58 +08:00
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+//
+// LOBStream.h
+//
+// Library: Data
+// Package: DataCore
+// Module:  LOBStream
+//
+// Definition of the LOBStream class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Data_LOBStream_INCLUDED
+#define Data_LOBStream_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/UnbufferedStreamBuf.h"
+#include "Poco/Data/LOB.h"
+#include <istream>
+#include <ostream>
+
+
+namespace Poco {
+namespace Data {
+
+
+template <typename T>
+class LOBStreamBuf: public BasicUnbufferedStreamBuf<T, std::char_traits<T> >
+	/// This is the streambuf class used for reading from and writing to a LOB.
+{
+public:	
+	LOBStreamBuf(LOB<T>& lob): _lob(lob), _it(_lob.begin())
+		/// Creates LOBStreamBuf.
+	{
+	}
+
+
+	~LOBStreamBuf()
+		/// Destroys LOBStreamBuf.
+	{
+	}
+
+protected:
+	typedef std::char_traits<T> TraitsType;
+	typedef BasicUnbufferedStreamBuf<T, TraitsType> BaseType;
+
+	typename BaseType::int_type readFromDevice()
+	{
+		if (_it != _lob.end())
+			return BaseType::charToInt(*_it++);
+		else
+			return -1;
+	}
+
+	typename BaseType::int_type writeToDevice(T c)
+	{
+		_lob.appendRaw(&c, 1);
+		return 1;
+	}
+
+private:
+	LOB<T>& _lob;
+	typename LOB<T>::Iterator _it;
+};
+
+
+template <typename T>
+class LOBIOS: public virtual std::ios
+	/// The base class for LOBInputStream and
+	/// LOBOutputStream.
+	///
+	/// This class is needed to ensure the correct initialization
+	/// order of the stream buffer and base classes.
+{
+public:
+	LOBIOS(LOB<T>& lob, openmode mode): _buf(lob)
+		/// Creates the LOBIOS with the given LOB.
+	{
+		poco_ios_init(&_buf);
+	}
+
+	~LOBIOS()
+		/// Destroys the LOBIOS.
+	{
+	}
+
+	LOBStreamBuf<T>* rdbuf()
+		/// Returns a pointer to the internal LOBStreamBuf.
+	{
+		return &_buf;
+	}
+
+protected:
+	LOBStreamBuf<T> _buf;
+};
+
+
+template <typename T>
+class LOBOutputStream: public LOBIOS<T>, public std::basic_ostream<T, std::char_traits<T> >
+	/// An output stream for writing to a LOB.
+{
+public:
+	LOBOutputStream(LOB<T>& lob):
+		LOBIOS<T>(lob, std::ios::out),
+		std::ostream(LOBIOS<T>::rdbuf())
+		/// Creates the LOBOutputStream with the given LOB.
+	{
+	}
+
+	~LOBOutputStream()
+		/// Destroys the LOBOutputStream.
+	{
+	}
+};
+
+
+template <typename T>
+class LOBInputStream: public LOBIOS<T>, public std::basic_istream<T, std::char_traits<T> >
+	/// An input stream for reading from a LOB.
+{
+public:
+	LOBInputStream(LOB<T>& lob):
+		LOBIOS<T>(lob, std::ios::in),
+		std::istream(LOBIOS<T>::rdbuf())
+		/// Creates the LOBInputStream with the given LOB.
+	{
+	}
+
+	~LOBInputStream()
+		/// Destroys the LOBInputStream.
+	{
+	}
+};
+
+
+typedef LOBOutputStream<unsigned char> BLOBOutputStream;
+typedef LOBOutputStream<char> CLOBOutputStream;
+
+typedef LOBInputStream<unsigned char> BLOBInputStream;
+typedef LOBInputStream<char> CLOBInputStream;
+
+} } // namespace Poco::Data
+
+
+#endif // Data_LOBStream_INCLUDED