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annotate piecrust/data/provider.py @ 440:32c7c2d219d2

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performance: Refactor how data is managed to reduce copying. * Make use of `collections.abc.Mapping` to better identify things that are supposed to look like dictionaries. * Instead of handling "overlay" of data in a dict tree in each different data object, make all objects `Mapping`s and handle merging at a higher level with the new `MergedMapping` object. * Since this new object is read-only, remove the need for deep-copying of app and page configurations. * Split data classes into separate modules.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 28 Jun 2015 08:22:39 -0700
parents e7b865f8f335
children 703ea5d76f33
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1 import time
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2 import collections.abc
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3 from piecrust.data.iterators import PageIterator
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4 from piecrust.sources.array import ArraySource
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7 class DataProvider(object):
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8 debug_render_dynamic = []
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9 debug_render_invoke_dynamic = []
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11 def __init__(self, source, page, override):
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12 if source.app is not page.app:
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13 raise Exception("The given source and page don't belong to "
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14 "the same application.")
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15 self._source = source
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16 self._page = page
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19 class IteratorDataProvider(DataProvider):
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20 PROVIDER_NAME = 'iterator'
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21
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22 debug_render_doc_dynamic = ['_debugRenderDoc']
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23 debug_render_not_empty = True
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25 def __init__(self, source, page, override):
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26 super(IteratorDataProvider, self).__init__(source, page, override)
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28 self._innerIt = None
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29 if isinstance(override, IteratorDataProvider):
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30 # Iterator providers can be chained, like for instance with
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31 # `site.pages` listing both the theme pages and the user site's
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32 # pages.
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33 self._innerIt = override
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34
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35 self._pages = PageIterator(source, current_page=page)
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36 self._pages._iter_event += self._onIteration
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37 self._ctx_set = False
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38
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39 def __len__(self):
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40 return len(self._pages)
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41
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42 def __getitem__(self, key):
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43 return self._pages[key]
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44
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45 def __iter__(self):
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46 yield from iter(self._pages)
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47 if self._innerIt:
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48 yield from self._innerIt
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50 def _onIteration(self):
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51 if not self._ctx_set:
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52 eis = self._page.app.env.exec_info_stack
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53 eis.current_page_info.render_ctx.addUsedSource(self._source.name)
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54 self._ctx_set = True
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55
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56 def _debugRenderDoc(self):
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57 return 'Provides a list of %d items' % len(self)
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60 class BlogDataProvider(DataProvider, collections.abc.Mapping):
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61 PROVIDER_NAME = 'blog'
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63 debug_render_doc = """Provides a list of blog posts and yearly/monthly
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64 archives."""
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65 debug_render_dynamic = (['_debugRenderTaxonomies'] +
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66 DataProvider.debug_render_dynamic)
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68 def __init__(self, source, page, override):
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69 super(BlogDataProvider, self).__init__(source, page, override)
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70 self._yearly = None
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71 self._monthly = None
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72 self._taxonomies = {}
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73 self._ctx_set = False
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75 def __getitem__(self, name):
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76 if name == 'posts':
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77 return self._posts()
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78 elif name == 'years':
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79 return self._buildYearlyArchive()
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80 elif name == 'months':
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81 return self._buildMonthlyArchive()
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82 elif self._source.app.getTaxonomy(name) is not None:
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83 return self._buildTaxonomy(name)
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84 raise KeyError("No such item: %s" % name)
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85
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86 def __iter__(self):
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87 keys = ['posts', 'years', 'months']
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88 keys += [t.name for t in self._source.app.taxonomies]
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89 return iter(keys)
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90
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91 def __len__(self):
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92 return 3 + len(self._source.app.taxonomies)
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93
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94 def _debugRenderTaxonomies(self):
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95 return [t.name for t in self._source.app.taxonomies]
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96
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97 def _posts(self):
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98 it = PageIterator(self._source, current_page=self._page)
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99 it._iter_event += self._onIteration
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100 return it
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101
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102 def _buildYearlyArchive(self):
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103 if self._yearly is not None:
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104 return self._yearly
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105
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106 self._yearly = []
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107 yearly_index = {}
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108 for post in self._source.getPages():
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109 year = post.datetime.strftime('%Y')
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110
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111 posts_this_year = yearly_index.get(year)
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112 if posts_this_year is None:
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113 timestamp = time.mktime(
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114 (post.datetime.year, 1, 1, 0, 0, 0, 0, 0, -1))
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115 posts_this_year = BlogArchiveEntry(self._page, year, timestamp)
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116 self._yearly.append(posts_this_year)
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117 yearly_index[year] = posts_this_year
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118
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119 posts_this_year._data_source.append(post)
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120 self._yearly = sorted(self._yearly,
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121 key=lambda e: e.timestamp,
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122 reverse=True)
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123 self._onIteration()
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124 return self._yearly
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125
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126 def _buildMonthlyArchive(self):
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127 if self._monthly is not None:
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128 return self._monthly
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129
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130 self._monthly = []
114
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131 for post in self._source.getPages():
3
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132 month = post.datetime.strftime('%B %Y')
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133
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134 posts_this_month = next(
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135 filter(lambda m: m.name == month, self._monthly),
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136 None)
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137 if posts_this_month is None:
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138 timestamp = time.mktime(
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139 (post.datetime.year, post.datetime.month, 1,
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140 0, 0, 0, 0, 0, -1))
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141 posts_this_month = BlogArchiveEntry(self._page, month, timestamp)
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142 self._monthly.append(posts_this_month)
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143
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144 posts_this_month._data_source.append(post)
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145 self._monthly = sorted(self._monthly,
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146 key=lambda e: e.timestamp,
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147 reverse=True)
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148 self._onIteration()
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149 return self._monthly
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150
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151 def _buildTaxonomy(self, tax_name):
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152 if tax_name in self._taxonomies:
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153 return self._taxonomies[tax_name]
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154
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155 tax_info = self._page.app.getTaxonomy(tax_name)
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156 setting_name = tax_info.setting_name
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157
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158 posts_by_tax_value = {}
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159 for post in self._source.getPages():
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160 tax_values = post.config.get(setting_name)
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161 if tax_values is None:
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162 continue
3
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163 if not isinstance(tax_values, list):
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164 tax_values = [tax_values]
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165 for val in tax_values:
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166 posts_by_tax_value.setdefault(val, [])
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167 posts_by_tax_value[val].append(post)
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168
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169 entries = []
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170 for value, ds in posts_by_tax_value.items():
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171 source = ArraySource(self._page.app, ds)
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172 entries.append(BlogTaxonomyEntry(self._page, source, value))
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173 self._taxonomies[tax_name] = sorted(entries, key=lambda k: k.name)
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174
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175 self._onIteration()
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176 return self._taxonomies[tax_name]
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177
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178 def _onIteration(self):
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179 if not self._ctx_set:
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180 eis = self._page.app.env.exec_info_stack
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181 eis.current_page_info.render_ctx.addUsedSource(self._source)
3
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182 self._ctx_set = True
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183
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184
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185 class BlogArchiveEntry(object):
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186 def __init__(self, page, name, timestamp):
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187 self.name = name
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188 self.timestamp = timestamp
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189 self._page = page
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190 self._data_source = []
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191 self._iterator = None
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192
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193 def __str__(self):
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194 return self.name
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195
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196 @property
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197 def posts(self):
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198 self._load()
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199 self._iterator.reset()
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200 return self._iterator
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201
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202 def _load(self):
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203 if self._iterator is not None:
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204 return
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205 source = ArraySource(self._page.app, self._data_source)
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206 self._iterator = PageIterator(source, current_page=self._page)
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207
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208
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209 class BlogTaxonomyEntry(object):
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210 def __init__(self, page, source, property_value):
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211 self._page = page
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212 self._source = source
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213 self._property_value = property_value
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214 self._iterator = None
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215
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216 def __str__(self):
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217 return self._property_value
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218
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219 @property
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220 def name(self):
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221 return self._property_value
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222
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223 @property
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224 def posts(self):
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225 self._load()
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226 self._iterator.reset()
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227 return self._iterator
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228
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229 @property
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230 def post_count(self):
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231 return self._source.page_count
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232
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233 def _load(self):
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234 if self._iterator is not None:
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235 return
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236
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237 self._iterator = PageIterator(self._source, self._page)
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238