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""" A resource protocol for a local file system. """
# Standard library imports.
import errno
# Enthought library imports.
from enthought.traits.api import HasTraits, implements
# Local imports.
from i_resource_protocol import IResourceProtocol
from no_such_resource_error import NoSuchResourceError
class FileResourceProtocol(HasTraits):
""" A resource protocol for a local file system. """
implements(IResourceProtocol)
###########################################################################
# 'IResourceProtocol' interface.
###########################################################################
def file(self, address):
""" Return a readable file-like object for the specified address. """
# Opened in binary mode to be consistent with package resources. This
# means, for example, that line-endings will not be converted.
try:
f = file(address, 'rb')
except IOError, e:
if e.errno == errno.ENOENT:
raise NoSuchResourceError(address)
else:
raise
return f
#### EOF ######################################################################
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