def update_material(self, material):
""" Update a material
Parameters
----------
material : Material
the material to be updated.
Raises
------
ValueError:
If a material with this uid does not exist
"""
self._materials[material.uid] = Material.from_material(material)
def get_material(self, uid):
""" Get the material
Parameters
----------
uid: uuid.UUID
the id of the material to be retrieved.
Returns
-------
material
Raises
------
KeyError:
If there is no material with the given uid
"""
return Material.from_material(self._materials[uid])
def add_material(self, material):
"""Add a material
Parameters
----------
material : Material
the material to be added.
Raises
------
ValueError:
If a material with the same uid already exists
"""
if material.uid in self._materials:
raise ValueError(
"Material (uid:{}) already exists.".format(material.uid))
else:
self._materials[material.uid] = Material.from_material(material)
