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BibIndexMultiFieldTokenizer.py
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Fri, Aug 16, 14:08

BibIndexMultiFieldTokenizer.py
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# -*- coding:utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2010, 2011, 2012 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
BibIndexMultiFieldTokenizer.
Base class for tokenizers that work on more than one field
and possibly on more than one phrase at a time.
"""
from invenio.bibindex_engine_config import CFG_BIBINDEX_INDEX_TABLE_TYPE
from invenio.bibindex_tokenizers.BibIndexTokenizer import BibIndexTokenizer
class BibIndexMultiFieldTokenizer(BibIndexTokenizer):
"""
BibIndexMultiFieldTokenizer is an abstract tokenizer.
It should be used only for inheritance.
This tokenizer should be a base class for more complicated
tokenizers which tokenizing functions perform calculations
on per record basis and NOT per string basis (look for
BibIndexDefaultTokenizer if you want to know more about the
latter type of tokenization).
Tokenizing functions take as an argument recID of the record
we want to perform calculations on.
Example:
class BibIndexComplicatedTokenizer(BibIndexMultiFieldTokenizer):
(...)
recID = 10
a = BibIndexComplicatedTokenizer()
res = a.tokenize_for_words(recID)
Good examples of MultiFieldTokenizer are JournalTokenizer and
AuthorCountTokenizer.
Both return results after processing more than one field/tag
of the record (for more information check these tokenizers).
"""
def __init__(self, stemming_language = None, remove_stopwords = False, remove_html_markup = False, remove_latex_markup = False):
"""@param stemming_language: dummy
@param remove_stopwords: dummy
@param remove_html_markup: dummy
@param remove_latex_markup: dummy
"""
pass
def get_tokenizing_function(self, wordtable_type):
"""Picks correct tokenize_for_xxx function depending on type of tokenization (wordtable_type)"""
raise NotImplementedError
def tokenize_for_words(self, recid):
raise NotImplementedError
def tokenize_for_pairs(self, recid):
raise NotImplementedError
def tokenize_for_phrases(self, recid):
raise NotImplementedError

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