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| <div class="title">SpatialPrefixTreeFactory.cs</div> </div> |
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| <a href="_spatial_prefix_tree_factory_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div> |
| <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * contributor license agreements. See the NOTICE file distributed with</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * this work for additional information regarding copyright ownership.</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * (the "License"); you may not use this file except in compliance with</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * the License. You may obtain a copy of the License at</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span></div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * See the License for the specific language governing permissions and</span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * limitations under the License.</span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">using</span> System;</div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">using</span> System.Collections.Generic;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">using</span> Spatial4n.Core.Context;</div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">using</span> Spatial4n.Core.Distance;</div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">namespace </span>Lucene.Net.Spatial.Prefix.Tree</div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> {</div> |
| <div class="line"><a name="l00029"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html"> 29</a></span>  <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html" title="Abstract Factory for creating SpatialPrefixTree instances with useful defaults and passed on configur...">SpatialPrefixTreeFactory</a></div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  {</div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keyword">private</span> <span class="keyword">const</span> <span class="keywordtype">double</span> DEFAULT_GEO_MAX_DETAIL_KM = 0.001; <span class="comment">//1m</span></div> |
| <div class="line"><a name="l00032"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a9386f9a28cfc7966cd629756e38b553a"> 32</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> readonly String PREFIX_TREE = <span class="stringliteral">"prefixTree"</span>;</div> |
| <div class="line"><a name="l00033"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a94b6ee28c2d85b2c5376929fa1a8755d"> 33</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> readonly String MAX_LEVELS = <span class="stringliteral">"maxLevels"</span>;</div> |
| <div class="line"><a name="l00034"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a47ed65b454753db1e5ae45fcc9beb3f9"> 34</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> readonly String MAX_DIST_ERR = <span class="stringliteral">"maxDistErr"</span>;</div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div> |
| <div class="line"><a name="l00036"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a44bfd0e7600aaa1a6663cc43f8f2d176"> 36</a></span>  <span class="keyword">protected</span> Dictionary<String, String> <a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a44bfd0e7600aaa1a6663cc43f8f2d176">args</a>;</div> |
| <div class="line"><a name="l00037"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a44e89158f0729e72f6b333cdbd3f3c4e"> 37</a></span>  <span class="keyword">protected</span> SpatialContext <a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a44e89158f0729e72f6b333cdbd3f3c4e">ctx</a>;</div> |
| <div class="line"><a name="l00038"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a95a273dc34d338138da996ef2107a8af"> 38</a></span>  <span class="keyword">protected</span> <span class="keywordtype">int</span>? <a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a95a273dc34d338138da996ef2107a8af">maxLevels</a>;</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div> |
| <div class="line"><a name="l00047"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a31ea0092020fb29de21d13a26f879fc8"> 47</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> <a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree.html" title="A spatial Prefix Tree, or Trie, which decomposes shapes into prefixed strings at variable lengths cor...">SpatialPrefixTree</a> MakeSPT(Dictionary<String, String> args, SpatialContext ctx)</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  {</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html" title="Abstract Factory for creating SpatialPrefixTree instances with useful defaults and passed on configur...">SpatialPrefixTreeFactory</a> instance;</div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  String cname;</div> |
| <div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">if</span> (!args.TryGetValue(PREFIX_TREE, out cname) || cname == null)</div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  cname = ctx.IsGeo() ? <span class="stringliteral">"geohash"</span> : <span class="stringliteral">"quad"</span>;</div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">if</span> (<span class="stringliteral">"geohash"</span>.Equals(cname, StringComparison.InvariantCultureIgnoreCase))</div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  instance = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_geohash_prefix_tree.html" title="A SpatialPrefixGrid based on Geohashes. Uses GeohashUtils to do all the geohash work. ">GeohashPrefixTree</a>.Factory();</div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<span class="stringliteral">"quad"</span>.Equals(cname, StringComparison.InvariantCultureIgnoreCase))</div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  instance = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_quad_prefix_tree.html" title="Implementation of SpatialPrefixTree which uses a quad tree (http://en.wikipedia.org/wiki/Quadtree) ...">QuadPrefixTree</a>.Factory();</div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  {</div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  Type t = Type.GetType(cname);</div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  instance = (<a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html" title="Abstract Factory for creating SpatialPrefixTree instances with useful defaults and passed on configur...">SpatialPrefixTreeFactory</a>)Activator.CreateInstance(t);</div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  }</div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  instance.<a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#ad58736b447accf775473847992038b18">Init</a>(args, ctx);</div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> instance.<a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#a9b9e1046086ee9af37ef45bd90dc8411">NewSPT</a>();</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  }</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div> |
| <div class="line"><a name="l00066"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#ad58736b447accf775473847992038b18"> 66</a></span>  <span class="keyword">protected</span> <span class="keywordtype">void</span> Init(Dictionary<String, String> args, SpatialContext ctx)</div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  {</div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  this.args = args;</div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  this.ctx = ctx;</div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  InitMaxLevels();</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div> |
| <div class="line"><a name="l00073"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree_factory.html#aae03550ac7821e5be41bd55bab2cd713"> 73</a></span>  <span class="keyword">protected</span> <span class="keywordtype">void</span> InitMaxLevels()</div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  {</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  String mlStr;</div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">if</span> (args.TryGetValue(MAX_LEVELS, out mlStr) && mlStr != null)</div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  {</div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  maxLevels = <span class="keywordtype">int</span>.Parse(mlStr);</div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span>;</div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">double</span> degrees;</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">if</span> (!args.TryGetValue(MAX_DIST_ERR, out mlStr) || mlStr == null)</div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  {</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">if</span> (!ctx.IsGeo())</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">return</span>; <span class="comment">//let default to max</span></div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  degrees = DistanceUtils.Dist2Degrees(DEFAULT_GEO_MAX_DETAIL_KM, DistanceUtils.EARTH_MEAN_RADIUS_KM);</div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  {</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  degrees = <a class="code" href="_field_cache_8cs.html#a25c00e2f72f342fcb5e4c4577df33033">Double</a>.Parse(mlStr);</div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  }</div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  maxLevels = GetLevelForDistance(degrees);</div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  }</div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">/* Calls {@link SpatialPrefixTree#getLevelForDistance(double)}. */</span></div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keyword">protected</span> <span class="keyword">abstract</span> <span class="keywordtype">int</span> GetLevelForDistance(<span class="keywordtype">double</span> degrees);</div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">protected</span> <span class="keyword">abstract</span> <a class="code" href="class_lucene_1_1_net_1_1_spatial_1_1_prefix_1_1_tree_1_1_spatial_prefix_tree.html" title="A spatial Prefix Tree, or Trie, which decomposes shapes into prefixed strings at variable lengths cor...">SpatialPrefixTree</a> NewSPT();</div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span> }</div> |
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