def __init__(self, collector=None, processors=None, validator_class=None):
'''Initialise session.
*collector* is used to collect schemas for use in the session and
should conform to the :py:class:`~harmony.schema.collector.Collector`
interface. Defaults to a
:py:class:`~harmony.schema.collector.FileSystemCollector` using the
environment variable :envvar:`HARMONY_SCHEMA_PATH` to discover schemas.
*processors* specifies a list of
:py:class:`~harmony.schema.processor.Processor` instances that will
post-process any discovered schemas. If not specified will default to
[:py:class:`~harmony.schema.processor.ValidateProcessor`,
:py:class:`~harmony.schema.processor.MixinProcessor`].
*validator_class* should be the class to use for validation of schemas
and instances. Defaults to
:py:class:`harmony.schema.validator.Validator`.
'''
self.schemas = Collection()
self.collector = collector
if self.collector is None:
paths = os.environ.get('HARMONY_SCHEMA_PATH',
self.DEFAULT_SCHEMA_PATH).split(os.pathsep)
self.collector = FilesystemCollector(paths)
self.validator_class = validator_class
if self.validator_class is None:
self.validator_class = Validator
self.processors = processors
if self.processors is None:
self.processors = [
ValidateProcessor(self.validator_class),
MixinProcessor()
]
self.refresh()
