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# -*- coding: utf-8 -*-
# Copyright (c) 2010 Mark Sandstrom
# Copyright (c) 2011 Raphaël Barrois
#
# 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.
class OrderedDeclaration(object):
"""A factory declaration.
Ordered declarations mark an attribute as needing lazy evaluation.
This allows them to refer to attributes defined by other OrderedDeclarations
in the same factory.
"""
def evaluate(self, sequence, obj):
"""Evaluate this declaration.
Args:
sequence (int): the current sequence counter to use when filling
the current instance
obj (containers.LazyStub): The object holding currently computed
attributes
"""
raise NotImplementedError('This is an abstract method')
class LazyAttribute(OrderedDeclaration):
"""Specific OrderedDeclaration computed using a lambda.
Attributes:
function (function): a function, expecting the current LazyStub and
returning the computed value.
"""
def __init__(self, function, *args, **kwargs):
super(LazyAttribute, self).__init__(*args, **kwargs)
self.function = function
def evaluate(self, sequence, obj):
return self.function(obj)
class SelfAttribute(OrderedDeclaration):
"""Specific OrderedDeclaration copying values from other fields.
Attributes:
attribute_name (str): the name of the attribute to copy.
"""
def __init__(self, attribute_name, *args, **kwargs):
super(SelfAttribute, self).__init__(*args, **kwargs)
self.attribute_name = attribute_name
def evaluate(self, sequence, obj):
# TODO(rbarrois): allow the use of ATTR_SPLITTER to fetch fields of
# subfactories.
return getattr(obj, self.attribute_name)
class Sequence(OrderedDeclaration):
"""Specific OrderedDeclaration to use for 'sequenced' fields.
These fields are typically used to generate increasing unique values.
Attributes:
function (function): A function, expecting the current sequence counter
and returning the computed value.
type (function): A function converting an integer into the expected kind
of counter for the 'function' attribute.
"""
def __init__(self, function, type=str):
super(Sequence, self).__init__()
self.function = function
self.type = type
def evaluate(self, sequence, obj):
return self.function(self.type(sequence))
class LazyAttributeSequence(Sequence):
"""Composite of a LazyAttribute and a Sequence.
Attributes:
function (function): A function, expecting the current LazyStub and the
current sequence counter.
type (function): A function converting an integer into the expected kind
of counter for the 'function' attribute.
"""
def evaluate(self, sequence, obj):
return self.function(obj, self.type(sequence))
class SubFactory(OrderedDeclaration):
"""Base class for attributes based upon a sub-factory.
Attributes:
defaults (dict): Overrides to the defaults defined in the wrapped
factory
factory (base.Factory): the wrapped factory
"""
def __init__(self, factory, **kwargs):
super(SubFactory, self).__init__()
self.defaults = kwargs
self.factory = factory
def evaluate(self, create, extra):
"""Evaluate the current definition and fill its attributes.
Uses attributes definition in the following order:
- attributes defined in the wrapped factory class
- values defined when defining the SubFactory
- additional values defined in attributes
"""
defaults = dict(self.defaults)
if extra:
defaults.update(extra)
attrs = self.factory.attributes(create, defaults)
if create:
return self.factory.create(**attrs)
else:
return self.factory.build(**attrs)
# Decorators... in case lambdas don't cut it
def lazy_attribute(func):
return LazyAttribute(func)
def sequence(func):
return Sequence(func)
def lazy_attribute_sequence(func):
return LazyAttributeSequence(func)
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