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Sct::IOManager Class Reference

An abstract class that represents an I/O backend. More...

#include <IOManager.h>

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Methods for Streamable implementors

Note:
These methods are named readImpl and writeImpl to avoid a gcc 2.9x bug.


virtual void writeImpl (OStream &out, const Streamable &ob, bool writeClassName) const
 Writes a Streamable to an output stream.

virtual void writeImpl (OStream &out, const Streamable &ob, const string &className) const
 Writes a Streamable to an output stream with a different name - to be used for base classes.

virtual void writeImpl (OStream &out, const Streamable &ob, const char *className) const
 explicitly calls same with string as final argument, to prevent implicit conversion to bool

virtual shared_ptr< Streamable > readImpl (IStream &in) const
 Read a Streamable from an input stream.

virtual shared_ptr< Streamable > readImpl (IStream &in, const string &className) const
 Read a Streamable from an input stream.

virtual shared_ptr< Streamable > readImpl (IStream &in, const char *className) const
 explicit conversion to string for the final argument prevents accidental implicit conversion to bool.

virtual void readImpl (IStream &in, Streamable &ob, bool readClassName) const
 Read a Streamable from an input stream.

virtual void readImpl (IStream &in, Streamable &ob, const string &className) const
 Read a Streamable from an input stream with different classname - to be used for derrived classes.

virtual void readImpl (IStream &in, Streamable &ob, const char *className) const
 calls method with explicit string in last arg to prevent implicit conversion to bool

virtual void writeClassName (OStream &out, const string &className) const
 Writes a class name to an OStream.

virtual string readClassName (IStream &in) const
 Read a class name from an IStream.

bool addToMap (const std::string &className, std::auto_ptr< Streamer > s) throw ()
 Add a Streamer to the map.


Methods for sub-class authors

Note:
These methods are named readImpl and writeImpl to avoid a gcc 2.9x bug.


typedef map< string, shared_ptr<
Streamer > > 		StreamerMap
virtual Streamer & getStreamer (const string &className) const
 A sub-class can override this if it wants to influence the Streamer that will be used for a particular class.

virtual Streamer & getStreamer (const string &className, const unsigned version) const
 Get a particular verion of a streamer, to be used e.g.

StreamerMap & getMap () throw ()
 map of classname, streamer

StreamerMap & getFullVersionMap () throw ()
 map of mapname (=classname/version), streamer

std::string getMapName (const std::string &classname, const unsigned version) throw ()
class Streamer

Public Member Functions

Methods for users
{

virtual void write (const Serializable &ob, const IOParams *params=0) const=0
 Write an object.

virtual shared_ptr< Serializable > read (const string &name, const IOParams *params=0) const=0
 Read an object.

Detailed Description

An abstract class that represents an I/O backend.

Possibilities are raw file, IS, some other form of persistency. Perhaps even a viewer.

Some methods here deal with a name. This is a backend specific identifier - e.g. a filename or an IS name. In order to retrieve a name, a backend specific method or an appropriate IOName sub-class should be used.

shared_ptr is returned sometimes, rather than auto_ptr to allow singletons to be returned which might be indicated by some numeric ID for instance.

Author:
Matthew Palmer
Date:
15 July 2003

Definition at line 43 of file IOManager.h.

Member Function Documentation

bool Sct::IOManager::addToMap (  const std::string &  className,
std::auto_ptr< Streamer >  s
)  throw () [static]
 

Add a Streamer to the map.

The Streamer will be used to do IO on classes named className.

Parameters:
className The name of the class that s can do IO on.
s An Streamer capable of doing IO on classes named className.
Returns:
True if successful

Definition at line 17 of file IOManager.cpp.

References Sct::AbstractThrowable::sendToMrs().

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StreamerMap & Sct::IOManager::getFullVersionMap (   )  throw () [static, protected]
 

map of mapname (=classname/version), streamer

Definition at line 55 of file IOManager.cpp.

Referenced by getStreamer().

StreamerMap & Sct::IOManager::getMap (   )  throw () [static, protected]
 

map of classname, streamer

Definition at line 60 of file IOManager.cpp.

Referenced by getStreamer().

Streamer & Sct::IOManager::getStreamer (  const string &  className,
const unsigned  version
)  const [protected, virtual]
 

Get a particular verion of a streamer, to be used e.g.

by archival when reading data saved with old streamers.

Definition at line 82 of file IOManager.cpp.

References getFullVersionMap().

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Streamer & Sct::IOManager::getStreamer (  const string &  className  )  const [protected, virtual]
 

A sub-class can override this if it wants to influence the Streamer that will be used for a particular class.

Returns:
an appropriate Streamer.
Exceptions:
InvalidArgumentError if an appropriate Streamer can't be found.

Reimplemented in Sct::Archive::IOManagerStreamerVersioned.

Definition at line 65 of file IOManager.cpp.

References getMap().

Referenced by readImpl(), Sct::IOManagerDummy::testStreaming1(), Sct::IOManagerDummy::testStreaming2(), and writeImpl().

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virtual shared_ptr<Serializable> Sct::IOManager::read (  const string &  name,
const IOParams *  params = 0
)  const [pure virtual]
 

Read an object.

Will determine the class by first reading a string assumed to contain the className.

Parameters:
name The name of the object to read
params A backend specific sub-class of IOParams.
Exceptions:
IoException if there is a problem with the I/O

Implemented in Sct::Archive::IOManagerArchiveFile, Sct::IOManagerDummy, and Sct::IS::IOManagerIS.

string Sct::IOManager::readClassName (  IStream &  in  )  const [virtual]
 

Read a class name from an IStream.

Should only be overriden if absolutely necessary. Sub-classes should use this method if ever they need to write a class name and avoid proprietry solutions as they may break Java compatability.

Parameters:
in the IStream to be written to
Returns:
the className
Exceptions:
IoException if something bad happens in OStream or there is no className to be read

Reimplemented in Sct::Archive::IOManagerStreamerVersioned.

Definition at line 170 of file IOManager.cpp.

Referenced by readImpl().

void Sct::IOManager::readImpl (  IStream &  in,
Streamable &  ob,
const char *  className
)  const [virtual]
 

calls method with explicit string in last arg to prevent implicit conversion to bool

Definition at line 142 of file IOManager.cpp.

References readImpl().

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void Sct::IOManager::readImpl (  IStream &  in,
Streamable &  ob,
const string &  className
)  const [virtual]
 

Read a Streamable from an input stream with different classname - to be used for derrived classes.

Parameters:
in the IStream to read from.
ob the object to read into.
readClassName if true, read a string that should match ob.getClassName() first
Exceptions:
IoException if something bad happens in the back-end.

Definition at line 132 of file IOManager.cpp.

References getStreamer(), and Sct::Streamer::read().

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void Sct::IOManager::readImpl (  IStream &  in,
Streamable &  ob,
bool  readClassName
)  const [virtual]
 

Read a Streamable from an input stream.

Parameters:
in the IStream to read from.
ob the object to read into.
readClassName if true, read a string that should match ob.getClassName() first
Exceptions:
IoException if something bad happens in the back-end.

Reimplemented in Sct::Archive::IOManagerStreamerVersioned.

Definition at line 151 of file IOManager.cpp.

References Sct::Streamable::getClassName(), getStreamer(), Sct::Streamer::read(), and readClassName().

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shared_ptr< Streamable > Sct::IOManager::readImpl (  IStream &  in,
const char *  className
)  const [virtual]
 

explicit conversion to string for the final argument prevents accidental implicit conversion to bool.

Definition at line 146 of file IOManager.cpp.

References readImpl().

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shared_ptr< Streamable > Sct::IOManager::readImpl (  IStream &  in,
const string &  className
)  const [virtual]
 

Read a Streamable from an input stream.

Corresponds to write with writeClassName=false.

Parameters:
in the IStream to read from
className 
Returns:
the newly created Streamable
Exceptions:
IoException if something bad happens in the back-end.

Definition at line 137 of file IOManager.cpp.

References getStreamer(), and Sct::Streamer::read().

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shared_ptr< Streamable > Sct::IOManager::readImpl (  IStream &  in  )  const [virtual]
 

Read a Streamable from an input stream.

Reads the class name from the stream first. Corresponds to write with writeClassName=true.

Parameters:
in the IStream to read from
Returns:
the newly created Streamable
Exceptions:
IoException if something bad happens in the back-end.

Reimplemented in Sct::Archive::IOManagerStreamerVersioned.

Definition at line 126 of file IOManager.cpp.

References getStreamer(), Sct::Streamer::read(), and readClassName().

Referenced by SctData::IO::RawScanResultStreamer_v2::read(), SctData::IO::RawScanResultStreamer_v1::read(), and readImpl().

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virtual void Sct::IOManager::write (  const Serializable &  ob,
const IOParams *  params = 0
)  const [pure virtual]
 

Write an object.

Parameters:
ob The Serializable to write
params A backend specific sub-class of IOParams.
Exceptions:
IoException if there is a problem with the I/O

Implemented in Sct::Archive::IOManagerArchiveFile, Sct::IOManagerDummy, and Sct::IS::IOManagerIS.

void Sct::IOManager::writeClassName (  OStream &  out,
const string &  className
)  const [virtual]
 

Writes a class name to an OStream.

Should only be overriden if absolutely necessary. Sub-classes should use this method if ever they need to write a class name and avoid proprietry solutions as they may break Java compatability.

Parameters:
out the OStream to be written to
className the class name to write
Exceptions:
IoException if something bad happens in OStream.

Reimplemented in Sct::Archive::IOManagerStreamerVersioned.

Definition at line 166 of file IOManager.cpp.

Referenced by writeImpl().

void Sct::IOManager::writeImpl (  OStream &  out,
const Streamable &  ob,
const char *  className
)  const [virtual]
 

explicitly calls same with string as final argument, to prevent implicit conversion to bool

Definition at line 117 of file IOManager.cpp.

References writeImpl().

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void Sct::IOManager::writeImpl (  OStream &  out,
const Streamable &  ob,
const string &  className
)  const [virtual]
 

Writes a Streamable to an output stream with a different name - to be used for base classes.

Parameters:
ob the Streamable to write.
out the OStream to write to.
writeClassName if true, write the class name, otherwise don't.
Exceptions:
IoException if something bad happens in the back-end.

Definition at line 121 of file IOManager.cpp.

References getStreamer(), and Sct::Streamer::write().

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void Sct::IOManager::writeImpl (  OStream &  out,
const Streamable &  ob,
bool  writeClassName
)  const [virtual]
 

Writes a Streamable to an output stream.

Parameters:
ob the Streamable to write.
out the OStream to write to.
writeClassName if true, write the class name, otherwise don't.
Exceptions:
IoException if something bad happens in the back-end.

Reimplemented in Sct::Archive::IOManagerStreamerVersioned.

Definition at line 111 of file IOManager.cpp.

References Sct::Streamable::getClassName(), getStreamer(), Sct::Streamer::write(), and writeClassName().

Referenced by SctData::IO::RawScanResultStreamer_v2::write(), SctData::IO::RawScanResultStreamer_v1::write(), and writeImpl().

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The documentation for this class was generated from the following files:
Generated on Thu Jul 15 09:51:18 2004 for SCT DAQ/DCS Software - C++ by doxygen 1.3.5