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#!/usr/bin/env python3
#
# Copyright (C) 2016 Codethink Limited
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
from ._plugincontext import _PluginContext
from .config import _site_info
from .element import Element
# A ElementFactory creates Element instances
# in the context of a given factory
#
# Args:
# plugin_base (PluginBase): The main PluginBase object to work with
# searchpath (list): A list of external paths to search for Element plugins
#
class _ElementFactory(_PluginContext):
def __init__(self, plugin_base, searchpath=None):
if searchpath is None:
searchpath = []
searchpath.insert(0, _site_info['element_plugins'])
super().__init__(plugin_base, Element, searchpath)
# create():
#
# Create an Element object, the pipeline uses this to create Element
# objects on demand for a given pipeline.
#
# Args:
# kind (str): The kind of Element to create
#
# Returns: A newly created Element object of the appropriate kind
#
# Raises: PluginError
#
def create(self, kind):
element_type = self.lookup(kind)
return element_type()
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