Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/boto/dynamodb/item.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # Copyright (c) 2012 Mitch Garnaat http://garnaat.org/
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2 # Copyright (c) 2012 Amazon.com, Inc. or its affiliates. All Rights Reserved
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3 #
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4 # Permission is hereby granted, free of charge, to any person obtaining a
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5 # copy of this software and associated documentation files (the
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6 # "Software"), to deal in the Software without restriction, including
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7 # without limitation the rights to use, copy, modify, merge, publish, dis-
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8 # tribute, sublicense, and/or sell copies of the Software, and to permit
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9 # persons to whom the Software is furnished to do so, subject to the fol-
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10 # lowing conditions:
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11 #
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12 # The above copyright notice and this permission notice shall be included
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13 # in all copies or substantial portions of the Software.
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14 #
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15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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16 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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17 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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18 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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19 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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21 # IN THE SOFTWARE.
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22 #
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23
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24 from boto.dynamodb.exceptions import DynamoDBItemError
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25
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26
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27 class Item(dict):
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28 """
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29 An item in Amazon DynamoDB.
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30
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31 :ivar hash_key: The HashKey of this item.
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32 :ivar range_key: The RangeKey of this item or None if no RangeKey
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33 is defined.
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34 :ivar hash_key_name: The name of the HashKey associated with this item.
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35 :ivar range_key_name: The name of the RangeKey associated with this item.
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36 :ivar table: The Table this item belongs to.
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37 """
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38
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39 def __init__(self, table, hash_key=None, range_key=None, attrs=None):
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40 self.table = table
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41 self._updates = None
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42 self._hash_key_name = self.table.schema.hash_key_name
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43 self._range_key_name = self.table.schema.range_key_name
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44 if attrs is None:
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45 attrs = {}
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46 if hash_key is None:
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47 hash_key = attrs.get(self._hash_key_name, None)
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48 self[self._hash_key_name] = hash_key
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49 if self._range_key_name:
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50 if range_key is None:
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51 range_key = attrs.get(self._range_key_name, None)
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52 self[self._range_key_name] = range_key
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53 self._updates = {}
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54 for key, value in attrs.items():
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55 if key != self._hash_key_name and key != self._range_key_name:
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56 self[key] = value
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57 self.consumed_units = 0
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58
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59 @property
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60 def hash_key(self):
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61 return self[self._hash_key_name]
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62
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63 @property
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64 def range_key(self):
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65 return self.get(self._range_key_name)
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66
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67 @property
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68 def hash_key_name(self):
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69 return self._hash_key_name
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70
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71 @property
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72 def range_key_name(self):
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73 return self._range_key_name
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74
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75 def add_attribute(self, attr_name, attr_value):
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76 """
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77 Queue the addition of an attribute to an item in DynamoDB.
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78 This will eventually result in an UpdateItem request being issued
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79 with an update action of ADD when the save method is called.
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80
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81 :type attr_name: str
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82 :param attr_name: Name of the attribute you want to alter.
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83
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84 :type attr_value: int|long|float|set
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85 :param attr_value: Value which is to be added to the attribute.
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86 """
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87 self._updates[attr_name] = ("ADD", attr_value)
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88
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89 def delete_attribute(self, attr_name, attr_value=None):
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90 """
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91 Queue the deletion of an attribute from an item in DynamoDB.
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92 This call will result in a UpdateItem request being issued
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93 with update action of DELETE when the save method is called.
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94
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95 :type attr_name: str
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96 :param attr_name: Name of the attribute you want to alter.
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97
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98 :type attr_value: set
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99 :param attr_value: A set of values to be removed from the attribute.
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100 This parameter is optional. If None, the whole attribute is
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101 removed from the item.
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102 """
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103 self._updates[attr_name] = ("DELETE", attr_value)
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104
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105 def put_attribute(self, attr_name, attr_value):
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106 """
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107 Queue the putting of an attribute to an item in DynamoDB.
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108 This call will result in an UpdateItem request being issued
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109 with the update action of PUT when the save method is called.
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110
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111 :type attr_name: str
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112 :param attr_name: Name of the attribute you want to alter.
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113
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114 :type attr_value: int|long|float|str|set
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115 :param attr_value: New value of the attribute.
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116 """
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117 self._updates[attr_name] = ("PUT", attr_value)
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118
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119 def save(self, expected_value=None, return_values=None):
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120 """
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121 Commits pending updates to Amazon DynamoDB.
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122
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123 :type expected_value: dict
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124 :param expected_value: A dictionary of name/value pairs that
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125 you expect. This dictionary should have name/value pairs
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126 where the name is the name of the attribute and the value is
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127 either the value you are expecting or False if you expect
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128 the attribute not to exist.
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129
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130 :type return_values: str
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131 :param return_values: Controls the return of attribute name/value pairs
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132 before they were updated. Possible values are: None, 'ALL_OLD',
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133 'UPDATED_OLD', 'ALL_NEW' or 'UPDATED_NEW'. If 'ALL_OLD' is
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134 specified and the item is overwritten, the content of the old item
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135 is returned. If 'ALL_NEW' is specified, then all the attributes of
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136 the new version of the item are returned. If 'UPDATED_NEW' is
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137 specified, the new versions of only the updated attributes are
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138 returned.
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139 """
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140 return self.table.layer2.update_item(self, expected_value,
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141 return_values)
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142
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143 def delete(self, expected_value=None, return_values=None):
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144 """
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145 Delete the item from DynamoDB.
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146
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147 :type expected_value: dict
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148 :param expected_value: A dictionary of name/value pairs that
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149 you expect. This dictionary should have name/value pairs
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150 where the name is the name of the attribute and the value
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151 is either the value you are expecting or False if you expect
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152 the attribute not to exist.
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153
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154 :type return_values: str
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155 :param return_values: Controls the return of attribute
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156 name-value pairs before then were changed. Possible
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157 values are: None or 'ALL_OLD'. If 'ALL_OLD' is
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158 specified and the item is overwritten, the content
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159 of the old item is returned.
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160 """
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161 return self.table.layer2.delete_item(self, expected_value,
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162 return_values)
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163
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164 def put(self, expected_value=None, return_values=None):
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165 """
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166 Store a new item or completely replace an existing item
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167 in Amazon DynamoDB.
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168
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169 :type expected_value: dict
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170 :param expected_value: A dictionary of name/value pairs that
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171 you expect. This dictionary should have name/value pairs
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172 where the name is the name of the attribute and the value
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173 is either the value you are expecting or False if you expect
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174 the attribute not to exist.
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175
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176 :type return_values: str
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177 :param return_values: Controls the return of attribute
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178 name-value pairs before then were changed. Possible
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179 values are: None or 'ALL_OLD'. If 'ALL_OLD' is
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180 specified and the item is overwritten, the content
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181 of the old item is returned.
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182 """
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183 return self.table.layer2.put_item(self, expected_value, return_values)
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184
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185 def __setitem__(self, key, value):
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186 """Overrwrite the setter to instead update the _updates
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187 method so this can act like a normal dict"""
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188 if self._updates is not None:
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189 self.put_attribute(key, value)
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190 dict.__setitem__(self, key, value)
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191
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192 def __delitem__(self, key):
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193 """Remove this key from the items"""
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194 if self._updates is not None:
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195 self.delete_attribute(key)
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196 dict.__delitem__(self, key)
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197
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198 # Allow this item to still be pickled
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199 def __getstate__(self):
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200 return self.__dict__
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201 def __setstate__(self, d):
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202 self.__dict__.update(d)