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xapianutils_bibindex_searcher.py
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Thu, Nov 7, 03:43

xapianutils_bibindex_searcher.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2011 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.
"""
Xapian utilities.
"""
from invenio.config import CFG_XAPIAN_ENABLED
from invenio.intbitset import intbitset
from invenio.xapianutils_config import XAPIAN_DIR
if CFG_XAPIAN_ENABLED:
import xapian
DATABASES = dict()
def xapian_get_bitset(index, query):
"""
Queries a Xapian index.
Returns: an intbitset containing all record ids
"""
if not DATABASES:
xapian_init_databases()
result = intbitset()
database = DATABASES[index]
enquire = xapian.Enquire(database)
query_string = query
qp = xapian.QueryParser()
stemmer = xapian.Stem("english")
qp.set_stemmer(stemmer)
qp.set_database(database)
qp.set_stemming_strategy(xapian.QueryParser.STEM_SOME)
pattern = qp.parse_query(query_string, xapian.QueryParser.FLAG_PHRASE)
enquire.set_query(pattern)
matches = enquire.get_mset(0, database.get_lastdocid())
for match in matches:
result.add(match.docid)
return result
def xapian_init_databases():
"""
Initializes all database objects.
"""
field = 'fulltext'
database = xapian.Database(XAPIAN_DIR + "/" + field)
DATABASES[field] = database

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