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# Copyright (c) 2012 Mitch Garnaat http://garnaat.org/
# Copyright (c) 2012 Amazon.com, Inc. or its affiliates. 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, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing 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 MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR 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 boto.dynamodb.types import dynamize_value
class Condition(object):
"""
Base class for conditions. Doesn't do a darn thing but allows
is to test if something is a Condition instance or not.
"""
def __eq__(self, other):
if isinstance(other, Condition):
return self.to_dict() == other.to_dict()
class ConditionNoArgs(Condition):
"""
Abstract class for Conditions that require no arguments, such
as NULL or NOT_NULL.
"""
def __repr__(self):
return '%s' % self.__class__.__name__
def to_dict(self):
return {'ComparisonOperator': self.__class__.__name__}
class ConditionOneArg(Condition):
"""
Abstract class for Conditions that require a single argument
such as EQ or NE.
"""
def __init__(self, v1):
self.v1 = v1
def __repr__(self):
return '%s:%s' % (self.__class__.__name__, self.v1)
def to_dict(self):
return {'AttributeValueList': [dynamize_value(self.v1)],
'ComparisonOperator': self.__class__.__name__}
class ConditionTwoArgs(Condition):
"""
Abstract class for Conditions that require two arguments.
The only example of this currently is BETWEEN.
"""
def __init__(self, v1, v2):
self.v1 = v1
self.v2 = v2
def __repr__(self):
return '%s(%s, %s)' % (self.__class__.__name__, self.v1, self.v2)
def to_dict(self):
values = (self.v1, self.v2)
return {'AttributeValueList': [dynamize_value(v) for v in values],
'ComparisonOperator': self.__class__.__name__}
class ConditionSeveralArgs(Condition):
"""
Abstract class for conditions that require several argument (ex: IN).
"""
def __init__(self, values):
self.values = values
def __repr__(self):
return '{0}({1})'.format(self.__class__.__name__,
', '.join(self.values))
def to_dict(self):
return {'AttributeValueList': [dynamize_value(v) for v in self.values],
'ComparisonOperator': self.__class__.__name__}
class EQ(ConditionOneArg):
pass
class NE(ConditionOneArg):
pass
class LE(ConditionOneArg):
pass
class LT(ConditionOneArg):
pass
class GE(ConditionOneArg):
pass
class GT(ConditionOneArg):
pass
class NULL(ConditionNoArgs):
pass
class NOT_NULL(ConditionNoArgs):
pass
class CONTAINS(ConditionOneArg):
pass
class NOT_CONTAINS(ConditionOneArg):
pass
class BEGINS_WITH(ConditionOneArg):
pass
class IN(ConditionSeveralArgs):
pass
class BEGINS_WITH(ConditionOneArg):
pass
class BETWEEN(ConditionTwoArgs):
pass
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