# ====================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ====================================================================
import sys
from lucene import \
LowerCaseTokenizer, PorterStemFilter, StopAnalyzer, StopFilter, \
TokenStream, PythonAnalyzer
from lia.analysis.positional.PositionalStopFilter import PositionalStopFilter
python_ver = '%d.%d.%d' %(sys.version_info[0:3])
if python_ver < '2.4':
from sets import Set
#
# An Analyzer extension
#
class PositionalPorterStopAnalyzer(PythonAnalyzer):
def __init__(self, stopWords=None):
super(PositionalPorterStopAnalyzer, self).__init__()
if stopWords is None:
self.stopWords = StopAnalyzer.ENGLISH_STOP_WORDS_SET
else:
self.stopWords = set(stopWords)
def tokenStream(self, fieldName, reader):
stopFilter = StopFilter(True, LowerCaseTokenizer(reader),
self.stopWords)
stopFilter.setEnablePositionIncrements(True)
return PorterStemFilter(stopFilter)
|