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""" A resource protocol for package resources. """
# Standard library imports.
import errno, pkg_resources
# 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 PackageResourceProtocol(HasTraits):
""" A resource protocol for package resources.
This protocol uses 'pkg_resources' to find and access resources.
An address for this protocol is a string in the form::
'package/resource'
e.g::
'acme.ui.workbench/preferences.ini'
"""
implements(IResourceProtocol)
###########################################################################
# 'IResourceProtocol' interface.
###########################################################################
def file(self, address):
""" Return a readable file-like object for the specified address. """
first_forward_slash = address.index('/')
package = address[:first_forward_slash]
resource_name = address[first_forward_slash+1:]
try:
f = pkg_resources.resource_stream(package, resource_name)
except IOError, e:
if e.errno == errno.ENOENT:
raise NoSuchResourceError(address)
else:
raise
except ImportError:
raise NoSuchResourceError(address)
return f
#### EOF ######################################################################
|
