NAME

       tcl::transform::core - Basic reflected/virtual channel transform support

SYNOPSIS

       package require Tcl  8.5

       package require TclOO

       package require tcl::transform::core  ?1?

       ::tcl::transform::core objectName

       objectName initialize thechannel mode

       objectName finalize thechannel

       objectName destroy

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DESCRIPTION

       The  tcl::transform::core  package  provides  a  TclOO class implementing common behaviour
       needed by virtually every reflected or  virtual  channel  transformation  (initialization,
       finalization).

       This  class  expects to be used as either superclass of a concrete channel class, or to be
       mixed into such a class.

CLASS API

       ::tcl::transform::core objectName
              This command creates a new transform core object  with  an  associated  global  Tcl
              command  whose  name  is  objectName.  This  command  may be used to invoke various
              operations on the object, as described in the section for the Instance API.

INSTANCE API

       The API of transform core instances provides  only  two  methods,  both  corresponding  to
       transform handler commands (For reference see TIP 230 [http:/tip.tcl.tk/230]). They expect
       to be called from whichever object instance the transform core was made a part of.

       objectName initialize thechannel mode
              This method implements standard behaviour for the initialize  method  of  transform
              handlers.  Using  introspection  it  finds  the  handler  methods  supported by the
              instance and returns a list containing their names, as expected by the support  for
              reflected transformation in the Tcl core.

              It  further remembers the channel handle in an instance variable for access by sub-
              classes.

       objectName finalize thechannel
              This method implements standard  behaviour  for  the  finalize  method  of  channel
              handlers. It simply destroys itself.

       objectName destroy
              Destroying  the  transform  core  instance  closes the channel and transform it was
              initialized for, see the method initialize. When destroyed from within  a  call  of
              finalize  this does not happen, under the assumption that the channel and transform
              are being destroyed by Tcl.

BUGS, IDEAS, FEEDBACK

       This document, and the package it describes,  will  undoubtedly  contain  bugs  and  other
       problems.   Please  report  such  in  the  category  virtchannel of the Tcllib SF Trackers
       [http://sourceforge.net/tracker/?group_id=12883].   Please  also  report  any  ideas   for
       enhancements you may have for either package and/or documentation.

KEYWORDS

       reflected channel, tip 219, virtual channel

CATEGORY

       Channels

COPYRIGHT

       Copyright (c) 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>