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annotate serializers.py @ 0:7a89ea5404b1

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Initial commit of parpg-core.
author M. George Hansen <technopolitica@gmail.com>
date Sat, 14 May 2011 01:12:35 -0700
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1 # This file is part of PARPG.
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2
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3 # PARPG is free software: you can redistribute it and/or modify
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4 # it under the terms of the GNU General Public License as published by
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5 # the Free Software Foundation, either version 3 of the License, or
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6 # (at your option) any later version.
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7
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8 # PARPG is distributed in the hope that it will be useful,
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9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 # GNU General Public License for more details.
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12
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13 # You should have received a copy of the GNU General Public License
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14 # along with PARPG. If not, see <http://www.gnu.org/licenses/>.
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15 """
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16 Provides classes used to serialize and deserialize Python classes.
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17 """
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18
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19 from abc import ABCMeta, abstractmethod
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20 try:
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21 from xml.etree import cElementTree as ElementTree
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22 except ImportError:
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23 from xml.etree import ElementTree
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24 try:
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25 from collections import OrderedDict
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26 except ImportError:
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27 from .common.ordereddict import OrderedDict
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28
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29 from .common.utils import dedent_chomp
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30
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31 import logging
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32
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33 logger = logging.getLogger('serializers')
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34
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35 class Serializable(object):
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36 def __init__(self, class_, init_args=None, attributes=None):
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37 self.class_ = class_
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38 if init_args is not None:
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39 self.init_args = OrderedDict(init_args)
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40 else:
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41 self.init_args = OrderedDict()
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42 if attributes is not None:
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43 self.attributes = OrderedDict(attributes)
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44 else:
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45 self.attributes = OrderedDict()
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46
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47
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48 class SerializableRegistry(object):
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49 """
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50 Class holding the data used to serialize and deserialize a particular
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51 Python object.
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52 """
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53 registered_classes = {}
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54
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55 @classmethod
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56 def registerClass(cls, name, class_, init_args=None, attributes=None):
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57 serializable = Serializable(class_, init_args, attributes)
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58 cls.registered_classes[name] = serializable
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59
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60
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61 class AbstractSerializer(object):
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62 __metaclass__ = ABCMeta
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63
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64 @abstractmethod
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65 def serialize(self, object_, stream):
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66 pass
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67
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68 @abstractmethod
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69 def deserialize(self, stream):
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70 pass
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71
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72
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73 class XmlSerializer(AbstractSerializer):
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74 def serialize(self, statistic, stream):
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75 pass
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76
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77 @classmethod
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78 def deserialize(cls, stream):
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79 element_tree = ElementTree.parse(stream)
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80 root_element = element_tree.getroot()
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81 object_ = cls.construct_object(root_element)
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82 return object_
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83
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84 @classmethod
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85 def construct_object(cls, element):
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86 element_name = element.tag
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87 if element_name in SerializableRegistry.registered_classes.keys():
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88 object_ = cls.construct_registered_class(element)
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89 elif len(element) > 0:
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90 # Element contains subelements, so we'll treat it as an
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91 # OrderedDict.
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92 if element_name == 'list':
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93 object_ = cls.construct_list(element)
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94 else:
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95 object_ = cls.construct_ordered_dict(element)
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96 else:
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97 object_ = cls.construct_primitive(element)
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98 return object_
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99
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100 @classmethod
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101 def construct_registered_class(cls, element):
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102 element_name = element.tag
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103 serializable = SerializableRegistry.registered_classes[element_name]
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104 class_ = serializable.class_
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105 init_args = OrderedDict()
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106 for subelement in element:
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107 arg = cls.construct_object(subelement)
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108 subelement_name = subelement.tag
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109 init_args[subelement_name] = arg
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110 try:
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111 object_ = class_(**init_args)
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112 except (TypeError, ValueError) as exception:
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113 logger.error(init_args)
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114 error_message = \
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115 'unable to deserialize tag {0}: {1}'.format(element_name,
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116 exception)
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117 raise ValueError(error_message)
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118 return object_
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119
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120 @classmethod
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121 def construct_ordered_dict(cls, element):
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122 object_ = OrderedDict()
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123 for subelement in element:
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124 child = cls.construct_object(subelement)
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125 name = subelement.tag
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126 object_[name] = child
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127 return object_
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128
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129 @classmethod
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130 def construct_list(cls, element):
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131 object_ = []
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132 for subelement in element:
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133 child = cls.construct_object(subelement)
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134 object_.append(child)
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135 return object_
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136
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137 @classmethod
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138 def construct_primitive(cls, element):
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139 text = element.text
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140 # Interpret the element's text as unicode by default.
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141 element_type = element.attrib.get('type', 'unicode')
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142 if element_type == 'unicode':
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143 formatted_text = dedent_chomp(text)
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144 object_ = unicode(formatted_text)
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145 elif element_type == 'str':
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146 formatted_text = dedent_chomp(text)
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147 object_ = str(formatted_text)
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148 elif element_type == 'int':
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149 object_ = int(text)
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150 elif element_type == 'float':
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151 object_ = float(text)
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152 else:
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153 error_message = '{0!r} is not a recognized primitive type'
7a89ea5404b1 Initial commit of parpg-core.
M. George Hansen <technopolitica@gmail.com>
parents:
diff changeset
154 error_message.format(element_type)
7a89ea5404b1 Initial commit of parpg-core.
M. George Hansen <technopolitica@gmail.com>
parents:
diff changeset
155 raise ValueError(error_message)
7a89ea5404b1 Initial commit of parpg-core.
M. George Hansen <technopolitica@gmail.com>
parents:
diff changeset
156 return object_