Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/boto/dynamodb/item.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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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) |