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Source code for galaxy.util.none_like

"""
Objects with No values
"""

from galaxy.datatypes.registry import Registry
from galaxy.model.metadata import MetadataCollection


[docs]class RecursiveNone(object): def __str__(self): return "None" def __repr__(self): return str(self) def __getattr__(self, name): value = RecursiveNone() setattr(self, name, value) return value def __bool__(self): return False __nonzero__ = __bool__
[docs]class NoneDataset(RecursiveNone):
[docs] def __init__(self, datatypes_registry=None, ext='data', dbkey='?'): self.ext = self.extension = ext self.dbkey = dbkey if datatypes_registry is None: # Default Value Required for unit tests datatypes_registry = Registry() datatypes_registry.load_datatypes() self.datatype = datatypes_registry.get_datatype_by_extension(ext) self._metadata = None self.metadata = MetadataCollection(self)
def __getattr__(self, name): return "None"
[docs] def missing_meta(self): return False