def read_schema(schema_file, extensions=None):
"""
Read a schema file from disk in order to pass it as an argument
to a new datamodel.
"""
def get_resolver(asdf_file):
extensions = asdf_file._extensions
def asdf_file_resolver(uri):
return extensions._url_mapping(extensions._tag_mapping(uri))
return asdf_file_resolver
default_extensions = [GWCSExtension(), JWSTExtension()]
if extensions is None:
extensions = default_extensions[:]
else:
extensions.extend(default_extensions)
asdf_file = AsdfFile(extensions=extensions)
if hasattr(asdf_file, 'resolver'):
file_resolver = asdf_file.resolver
else:
file_resolver = get_resolver(asdf_file)
schema = asdf_schema.load_schema(schema_file,
resolver=file_resolver,
resolve_references=True)
schema = merge_property_trees(schema)
return schema
from asdf import AsdfFile
from asdf import yamlutil
from asdf import schema as asdf_schema
from asdf import extension as asdf_extension
from . import ndmodel
from . import filetype
from . import fits_support
from . import properties
from . import schema as mschema
from .extension import BaseExtension
from jwst.transforms.jwextension import JWSTExtension
from gwcs.extension import GWCSExtension
jwst_extensions = [GWCSExtension(), JWSTExtension(), BaseExtension()]
class DataModel(properties.ObjectNode, ndmodel.NDModel):
"""
Base class of all of the data models.
"""
schema_url = "core.schema.yaml"
def __init__(self,
init=None,
schema=None,
extensions=None,
pass_invalid_values=False):
"""
Parameters