Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/boto/sdb/item.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
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1 # Copyright (c) 2006,2007 Mitch Garnaat http://garnaat.org/
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2 #
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3 # Permission is hereby granted, free of charge, to any person obtaining a
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4 # copy of this software and associated documentation files (the
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5 # "Software"), to deal in the Software without restriction, including
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6 # without limitation the rights to use, copy, modify, merge, publish, dis-
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7 # tribute, sublicense, and/or sell copies of the Software, and to permit
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8 # persons to whom the Software is furnished to do so, subject to the fol-
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9 # lowing conditions:
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10 #
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11 # The above copyright notice and this permission notice shall be included
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12 # in all copies or substantial portions of the Software.
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13 #
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14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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20 # IN THE SOFTWARE.
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21
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22 import base64
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23
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24 class Item(dict):
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25 """
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26 A ``dict`` sub-class that serves as an object representation of a
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27 SimpleDB item. An item in SDB is similar to a row in a relational
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28 database. Items belong to a :py:class:`Domain <boto.sdb.domain.Domain>`,
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29 which is similar to a table in a relational database.
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30
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31 The keys on instances of this object correspond to attributes that are
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32 stored on the SDB item.
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33
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34 .. tip:: While it is possible to instantiate this class directly, you may
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35 want to use the convenience methods on :py:class:`boto.sdb.domain.Domain`
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36 for that purpose. For example, :py:meth:`boto.sdb.domain.Domain.get_item`.
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37 """
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38 def __init__(self, domain, name='', active=False):
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39 """
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40 :type domain: :py:class:`boto.sdb.domain.Domain`
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41 :param domain: The domain that this item belongs to.
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42
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43 :param str name: The name of this item. This name will be used when
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44 querying for items using methods like
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45 :py:meth:`boto.sdb.domain.Domain.get_item`
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46 """
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47 dict.__init__(self)
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48 self.domain = domain
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49 self.name = name
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50 self.active = active
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51 self.request_id = None
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52 self.encoding = None
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53 self.in_attribute = False
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54 self.converter = self.domain.connection.converter
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55
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56 def startElement(self, name, attrs, connection):
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57 if name == 'Attribute':
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58 self.in_attribute = True
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59 self.encoding = attrs.get('encoding', None)
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60 return None
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61
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62 def decode_value(self, value):
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63 if self.encoding == 'base64':
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64 self.encoding = None
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65 return base64.decodestring(value)
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66 else:
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67 return value
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68
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69 def endElement(self, name, value, connection):
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70 if name == 'ItemName':
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71 self.name = self.decode_value(value)
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72 elif name == 'Name':
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73 if self.in_attribute:
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74 self.last_key = self.decode_value(value)
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75 else:
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76 self.name = self.decode_value(value)
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77 elif name == 'Value':
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78 if self.last_key in self:
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79 if not isinstance(self[self.last_key], list):
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80 self[self.last_key] = [self[self.last_key]]
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81 value = self.decode_value(value)
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82 if self.converter:
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83 value = self.converter.decode(value)
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84 self[self.last_key].append(value)
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85 else:
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86 value = self.decode_value(value)
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87 if self.converter:
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88 value = self.converter.decode(value)
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89 self[self.last_key] = value
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90 elif name == 'BoxUsage':
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91 try:
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92 connection.box_usage += float(value)
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93 except:
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94 pass
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95 elif name == 'RequestId':
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96 self.request_id = value
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97 elif name == 'Attribute':
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98 self.in_attribute = False
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99 else:
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100 setattr(self, name, value)
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101
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102 def load(self):
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103 """
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104 Loads or re-loads this item's attributes from SDB.
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105
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106 .. warning::
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107 If you have changed attribute values on an Item instance,
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108 this method will over-write the values if they are different in
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109 SDB. For any local attributes that don't yet exist in SDB,
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110 they will be safe.
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111 """
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112 self.domain.get_attributes(self.name, item=self)
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113
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114 def save(self, replace=True):
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115 """
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116 Saves this item to SDB.
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117
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118 :param bool replace: If ``True``, delete any attributes on the remote
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119 SDB item that have a ``None`` value on this object.
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120 """
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121 self.domain.put_attributes(self.name, self, replace)
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122 # Delete any attributes set to "None"
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123 if replace:
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124 del_attrs = []
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125 for name in self:
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126 if self[name] is None:
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127 del_attrs.append(name)
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128 if len(del_attrs) > 0:
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129 self.domain.delete_attributes(self.name, del_attrs)
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130
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131 def add_value(self, key, value):
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132 """
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133 Helps set or add to attributes on this item. If you are adding a new
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134 attribute that has yet to be set, it will simply create an attribute
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135 named ``key`` with your given ``value`` as its value. If you are
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136 adding a value to an existing attribute, this method will convert the
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137 attribute to a list (if it isn't already) and append your new value
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138 to said list.
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139
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140 For clarification, consider the following interactive session:
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141
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142 .. code-block:: python
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143
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144 >>> item = some_domain.get_item('some_item')
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145 >>> item.has_key('some_attr')
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146 False
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147 >>> item.add_value('some_attr', 1)
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148 >>> item['some_attr']
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149 1
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150 >>> item.add_value('some_attr', 2)
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151 >>> item['some_attr']
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152 [1, 2]
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153
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154 :param str key: The attribute to add a value to.
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155 :param object value: The value to set or append to the attribute.
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156 """
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157 if key in self:
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158 # We already have this key on the item.
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159 if not isinstance(self[key], list):
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160 # The key isn't already a list, take its current value and
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161 # convert it to a list with the only member being the
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162 # current value.
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163 self[key] = [self[key]]
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164 # Add the new value to the list.
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165 self[key].append(value)
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166 else:
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167 # This is a new attribute, just set it.
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168 self[key] = value
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169
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170 def delete(self):
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171 """
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172 Deletes this item in SDB.
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173
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174 .. note:: This local Python object remains in its current state
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175 after deletion, this only deletes the remote item in SDB.
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176 """
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177 self.domain.delete_item(self)