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<h1>Source code for django.contrib.gis.feeds</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">unicode_literals</span>
<span class="kn">from</span> <span class="nn">django.contrib.syndication.views</span> <span class="k">import</span> <span class="n">Feed</span> <span class="k">as</span> <span class="n">BaseFeed</span>
<span class="kn">from</span> <span class="nn">django.utils.feedgenerator</span> <span class="k">import</span> <span class="n">Atom1Feed</span><span class="p">,</span> <span class="n">Rss201rev2Feed</span>
<span class="k">class</span> <span class="nc">GeoFeedMixin</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This mixin provides the necessary routines for SyndicationFeed subclasses</span>
<span class="sd"> to produce simple GeoRSS or W3C Geo elements.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">georss_coords</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">coords</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> In GeoRSS coordinate pairs are ordered by lat/lon and separated by</span>
<span class="sd"> a single white space. Given a tuple of coordinates, this will return</span>
<span class="sd"> a unicode GeoRSS representation.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="s1">' '</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="s1">'</span><span class="si">%f</span><span class="s1"> </span><span class="si">%f</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">coord</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">coord</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="k">for</span> <span class="n">coord</span> <span class="ow">in</span> <span class="n">coords</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">add_georss_point</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handler</span><span class="p">,</span> <span class="n">coords</span><span class="p">,</span> <span class="n">w3c_geo</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Adds a GeoRSS point with the given coords using the given handler.</span>
<span class="sd"> Handles the differences between simple GeoRSS and the more popular</span>
<span class="sd"> W3C Geo specification.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">w3c_geo</span><span class="p">:</span>
<span class="n">lon</span><span class="p">,</span> <span class="n">lat</span> <span class="o">=</span> <span class="n">coords</span><span class="p">[:</span><span class="mi">2</span><span class="p">]</span>
<span class="n">handler</span><span class="o">.</span><span class="n">addQuickElement</span><span class="p">(</span><span class="s1">'geo:lat'</span><span class="p">,</span> <span class="s1">'</span><span class="si">%f</span><span class="s1">'</span> <span class="o">%</span> <span class="n">lat</span><span class="p">)</span>
<span class="n">handler</span><span class="o">.</span><span class="n">addQuickElement</span><span class="p">(</span><span class="s1">'geo:lon'</span><span class="p">,</span> <span class="s1">'</span><span class="si">%f</span><span class="s1">'</span> <span class="o">%</span> <span class="n">lon</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">handler</span><span class="o">.</span><span class="n">addQuickElement</span><span class="p">(</span><span class="s1">'georss:point'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">georss_coords</span><span class="p">((</span><span class="n">coords</span><span class="p">,)))</span>
<span class="k">def</span> <span class="nf">add_georss_element</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">,</span> <span class="n">w3c_geo</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This routine adds a GeoRSS XML element using the given item and handler.</span>
<span class="sd"> """</span>
<span class="c1"># Getting the Geometry object.</span>
<span class="n">geom</span> <span class="o">=</span> <span class="n">item</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'geometry'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">geom</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">geom</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)):</span>
<span class="c1"># Special case if a tuple/list was passed in. The tuple may be</span>
<span class="c1"># a point or a box</span>
<span class="n">box_coords</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">geom</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)):</span>
<span class="c1"># Box: ( (X0, Y0), (X1, Y1) )</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">geom</span><span class="p">)</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="n">box_coords</span> <span class="o">=</span> <span class="n">geom</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'Only should be two sets of coordinates.'</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">geom</span><span class="p">)</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="c1"># Point: (X, Y)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_georss_point</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">geom</span><span class="p">,</span> <span class="n">w3c_geo</span><span class="o">=</span><span class="n">w3c_geo</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">len</span><span class="p">(</span><span class="n">geom</span><span class="p">)</span> <span class="o">==</span> <span class="mi">4</span><span class="p">:</span>
<span class="c1"># Box: (X0, Y0, X1, Y1)</span>
<span class="n">box_coords</span> <span class="o">=</span> <span class="p">(</span><span class="n">geom</span><span class="p">[:</span><span class="mi">2</span><span class="p">],</span> <span class="n">geom</span><span class="p">[</span><span class="mi">2</span><span class="p">:])</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'Only should be 2 or 4 numeric elements.'</span><span class="p">)</span>
<span class="c1"># If a GeoRSS box was given via tuple.</span>
<span class="k">if</span> <span class="n">box_coords</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="n">w3c_geo</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'Cannot use simple GeoRSS box in W3C Geo feeds.'</span><span class="p">)</span>
<span class="n">handler</span><span class="o">.</span><span class="n">addQuickElement</span><span class="p">(</span><span class="s1">'georss:box'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">georss_coords</span><span class="p">(</span><span class="n">box_coords</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># Getting the lower-case geometry type.</span>
<span class="n">gtype</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">geom</span><span class="o">.</span><span class="n">geom_type</span><span class="p">)</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="k">if</span> <span class="n">gtype</span> <span class="o">==</span> <span class="s1">'point'</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_georss_point</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">geom</span><span class="o">.</span><span class="n">coords</span><span class="p">,</span> <span class="n">w3c_geo</span><span class="o">=</span><span class="n">w3c_geo</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">if</span> <span class="n">w3c_geo</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'W3C Geo only supports Point geometries.'</span><span class="p">)</span>
<span class="c1"># For formatting consistent w/the GeoRSS simple standard:</span>
<span class="c1"># http://georss.org/1.0#simple</span>
<span class="k">if</span> <span class="n">gtype</span> <span class="ow">in</span> <span class="p">(</span><span class="s1">'linestring'</span><span class="p">,</span> <span class="s1">'linearring'</span><span class="p">):</span>
<span class="n">handler</span><span class="o">.</span><span class="n">addQuickElement</span><span class="p">(</span><span class="s1">'georss:line'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">georss_coords</span><span class="p">(</span><span class="n">geom</span><span class="o">.</span><span class="n">coords</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">gtype</span> <span class="ow">in</span> <span class="p">(</span><span class="s1">'polygon'</span><span class="p">,):</span>
<span class="c1"># Only support the exterior ring.</span>
<span class="n">handler</span><span class="o">.</span><span class="n">addQuickElement</span><span class="p">(</span><span class="s1">'georss:polygon'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">georss_coords</span><span class="p">(</span><span class="n">geom</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">coords</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'Geometry type "</span><span class="si">%s</span><span class="s1">" not supported.'</span> <span class="o">%</span> <span class="n">geom</span><span class="o">.</span><span class="n">geom_type</span><span class="p">)</span>
<span class="c1"># ### SyndicationFeed subclasses ###</span>
<div class="viewcode-block" id="GeoRSSFeed"><a class="viewcode-back" href="../../../../ref/contrib/gis/feeds.html#django.contrib.gis.feeds.GeoRSSFeed">[docs]</a><span class="k">class</span> <span class="nc">GeoRSSFeed</span><span class="p">(</span><span class="n">Rss201rev2Feed</span><span class="p">,</span> <span class="n">GeoFeedMixin</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">rss_attributes</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">attrs</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">GeoRSSFeed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">rss_attributes</span><span class="p">()</span>
<span class="n">attrs</span><span class="p">[</span><span class="s1">'xmlns:georss'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'http://www.georss.org/georss'</span>
<span class="k">return</span> <span class="n">attrs</span>
<span class="k">def</span> <span class="nf">add_item_elements</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">GeoRSSFeed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">add_item_elements</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_georss_element</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">add_root_elements</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handler</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">GeoRSSFeed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">add_root_elements</span><span class="p">(</span><span class="n">handler</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_georss_element</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">feed</span><span class="p">)</span></div>
<div class="viewcode-block" id="GeoAtom1Feed"><a class="viewcode-back" href="../../../../ref/contrib/gis/feeds.html#django.contrib.gis.feeds.GeoAtom1Feed">[docs]</a><span class="k">class</span> <span class="nc">GeoAtom1Feed</span><span class="p">(</span><span class="n">Atom1Feed</span><span class="p">,</span> <span class="n">GeoFeedMixin</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">root_attributes</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">attrs</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">GeoAtom1Feed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">root_attributes</span><span class="p">()</span>
<span class="n">attrs</span><span class="p">[</span><span class="s1">'xmlns:georss'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'http://www.georss.org/georss'</span>
<span class="k">return</span> <span class="n">attrs</span>
<span class="k">def</span> <span class="nf">add_item_elements</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">GeoAtom1Feed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">add_item_elements</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_georss_element</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">add_root_elements</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handler</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">GeoAtom1Feed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">add_root_elements</span><span class="p">(</span><span class="n">handler</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_georss_element</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">feed</span><span class="p">)</span></div>
<div class="viewcode-block" id="W3CGeoFeed"><a class="viewcode-back" href="../../../../ref/contrib/gis/feeds.html#django.contrib.gis.feeds.W3CGeoFeed">[docs]</a><span class="k">class</span> <span class="nc">W3CGeoFeed</span><span class="p">(</span><span class="n">Rss201rev2Feed</span><span class="p">,</span> <span class="n">GeoFeedMixin</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">rss_attributes</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">attrs</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">W3CGeoFeed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">rss_attributes</span><span class="p">()</span>
<span class="n">attrs</span><span class="p">[</span><span class="s1">'xmlns:geo'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'http://www.w3.org/2003/01/geo/wgs84_pos#'</span>
<span class="k">return</span> <span class="n">attrs</span>
<span class="k">def</span> <span class="nf">add_item_elements</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">W3CGeoFeed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">add_item_elements</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_georss_element</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">item</span><span class="p">,</span> <span class="n">w3c_geo</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">add_root_elements</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handler</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">W3CGeoFeed</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">add_root_elements</span><span class="p">(</span><span class="n">handler</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_georss_element</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">feed</span><span class="p">,</span> <span class="n">w3c_geo</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span></div>
<span class="c1"># ### Feed subclass ###</span>
<div class="viewcode-block" id="Feed"><a class="viewcode-back" href="../../../../ref/contrib/gis/feeds.html#django.contrib.gis.feeds.Feed">[docs]</a><span class="k">class</span> <span class="nc">Feed</span><span class="p">(</span><span class="n">BaseFeed</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This is a subclass of the `Feed` from `django.contrib.syndication`.</span>
<span class="sd"> This allows users to define a `geometry(obj)` and/or `item_geometry(item)`</span>
<span class="sd"> methods on their own subclasses so that geo-referenced information may</span>
<span class="sd"> placed in the feed.</span>
<span class="sd"> """</span>
<span class="n">feed_type</span> <span class="o">=</span> <span class="n">GeoRSSFeed</span>
<span class="k">def</span> <span class="nf">feed_extra_kwargs</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">obj</span><span class="p">):</span>
<span class="k">return</span> <span class="p">{</span><span class="s1">'geometry'</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_dynamic_attr</span><span class="p">(</span><span class="s1">'geometry'</span><span class="p">,</span> <span class="n">obj</span><span class="p">)}</span>
<span class="k">def</span> <span class="nf">item_extra_kwargs</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
<span class="k">return</span> <span class="p">{</span><span class="s1">'geometry'</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_dynamic_attr</span><span class="p">(</span><span class="s1">'item_geometry'</span><span class="p">,</span> <span class="n">item</span><span class="p">)}</span></div>
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