# ====================================================================
# Copyright (c) 2004-2005 Open Source Applications Foundation.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions: 
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software. 
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# DEALINGS IN THE SOFTWARE.
# ====================================================================
#

from PyLucene import \
     LowerCaseFilter, StopFilter, \
     StandardAnalyzer, StandardTokenizer, StandardFilter

from lia.analysis.synonym.SynonymFilter import SynonymFilter

#
# An Analyzer extension
#

class SynonymAnalyzer(object):

    def __init__(self, engine):

        self.engine = engine

    def tokenStream(self, fieldName, reader):

        tokenStream = LowerCaseFilter(StandardFilter(StandardTokenizer(reader)))
        tokenStream = StopFilter(tokenStream, StandardAnalyzer.STOP_WORDS)
        filter = SynonymFilter(tokenStream, self.engine)

        return tokenStream.tokenFilter(filter)