Scripts to download files from google storage based on sha1 sums

third_party/gsutil/boto/dynamodb/condition.py

+# 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 '{}({})'.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