utils.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.

	"""Utility functions."""

	from invenio.ext.cache import cache
	from invenio.ext.sqlalchemy import db
	from invenio.utils.datastructures import LazyDict

	from .models import IdxINDEX, IdxINDEXField
	from .registry import tokenizers

	field_tokenizer_cache = LazyDict(
	lambda: dict(IdxINDEXField.get_field_tokenizers())
	)


	@cache.memoize()
	def get_idx_indexer(name):
	"""Return indexer field value."""
	return db.session.query(IdxINDEX.indexer).filter_by(name=name).scalar()


	def load_tokenizers():
	"""Load all the bibindex tokenizers and returns it."""
	return dict((module.__name__.split('.')[-1],
	getattr(module, module.__name__.split('.')[-1], ''))
	for module in tokenizers)