[Zope-Checkins] CVS: Zope/lib/python/Products/PluginIndexes/TextIndexNG - Converter.py:1.1.2.1

[Andreas Jung]

Update of /cvs-repository/Zope/lib/python/Products/PluginIndexes/TextIndexNG
In directory cvs.zope.org:/tmp/cvs-serv20992

Added Files:
      Tag: ajung-textindexng-branch
	Converter.py 
Log Message:
added registry for converters


=== Added File Zope/lib/python/Products/PluginIndexes/TextIndexNG/Converter.py ===
##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
# 
##############################################################################

__doc__ = """ converter registry """
__version__ = '$Id: Converter.py,v 1.1.2.1 2002/02/26 23:46:23 andreasjung Exp $'

import re, os
import converters

_default_cfg = 'converters.ini'


class ConverterRegistry:
    """ registry for converters """    

    converters = {}

    def __init__(self):
        self.readConfig(_default_cfg)


    def addConverter(self, extension=None, mimetype=None, callback=None):
        """ map either an extension or a mimetype to a converter function """

        if extension:
            self.converters[ extension ] = callback

        if mimetype:
            self.converters[ mimetype ] = callback


    def readConfig(self, fname):

        lines = open(fname).readlines()

        for line in lines:

            exts,mt,func = line.split(';')
            exts = exts.split(',')
            mt = mt.strip()
            func =  func.strip()

            callback = self.getCallback( func )

            for ext in exts:  self.addConverter(extension=ext, 
                                                callback=callback)
            
            self.addConverter(mimetype=mt, callback=callback)


    def getCallback(self, module):
        return converters.getConverter(module)
            

    def __call__(self, data, filename=None, mimetype=None):

        cb = None

        if mimetype:
            cb = self.converters.get(mimetype, None)

        elif not cb and filename:

            base,ext = os.apth.split( filename )        
            cb = self.converters.get(ext, None)

        if not cb: return data

        return cb( data )
        

Registry = ConverterRegistry()