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adapters.py
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adapters.py
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# Copyright (c) 2009-2010 VMware, Inc. All Rights Reserved.
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
from zope.interface import classImplements
from twisted.python import components
from interfaces import ITypedValue
def adapter(ifrom, ito):
"""Decorator to help registering a new adapter.
:param ifrom: interface or class to adapt
:param ito: interface to expose
"""
def _adapter(cls):
classImplements(cls, ito)
components.registerAdapter(cls, ifrom, ito)
return cls
return _adapter
class PrimitiveAdapter(object):
def __init__(self, original):
self._original = original
def value(self):
return "%s" % (self._original)
@adapter(str, ITypedValue)
class StringValue(PrimitiveAdapter):
"""Adapter from string to ITypedValue."""
def type(self):
return "string"
@adapter(int, ITypedValue)
class IntValue(PrimitiveAdapter):
"""Adapter from int to ITypedValue."""
def type(self):
return "number"
@adapter(bool, ITypedValue)
class BoolValue(PrimitiveAdapter):
"""Adapter from bool to ITypedValue."""
def type(self):
return "boolean"