collection.py
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	# -- coding: utf-8 --
	#
	# This file is part of Invenio.
	# Copyright (C) 2014, 2015 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.

	"""Collection search unit."""

	from intbitset import intbitset


	def search_unit(query, f, m, wl=None):
	"""Search for records in collection query.

	Example:

	.. code-block:: text

	collection:"BOOK"
	collection:"Books"
	"""
	from invenio.legacy.search_engine import (
	get_collection_reclist, search_unit_in_bibwords
	)
	if len(query):
	ahitset = get_collection_reclist(query)
	if not ahitset:
	return search_unit_in_bibwords(query, 'collection', m, wl=wl)
	return ahitset
	else:
	return intbitset([])