Lucene.Net  3.0.3
Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users.
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TermQueryPrefixTreeStrategy.cs
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2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
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5  * The ASF licenses this file to You under the Apache License, Version 2.0
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9  * http://www.apache.org/licenses/LICENSE-2.0
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16  */
17 
18 using System;
19 using Lucene.Net.Index;
20 using Lucene.Net.Search;
21 using Lucene.Net.Spatial.Prefix.Tree;
22 using Lucene.Net.Spatial.Queries;
23 using Lucene.Net.Spatial.Util;
24 using Spatial4n.Core.Shapes;
25 
26 namespace Lucene.Net.Spatial.Prefix
27 {
28  /// <summary>
29  /// A basic implementation using a large {@link TermsFilter} of all the nodes from
30  /// {@link SpatialPrefixTree#getNodes(com.spatial4j.core.shape.Shape, int, boolean)}.
31  /// </summary>
33  {
34  public TermQueryPrefixTreeStrategy(SpatialPrefixTree grid, string fieldName)
35  : base(grid, fieldName)
36  {
37  }
38 
39  public override Filter MakeFilter(SpatialArgs args)
40  {
41  SpatialOperation op = args.Operation;
42  if (op != SpatialOperation.Intersects)
43  throw new UnsupportedSpatialOperation(op);
44 
45  Shape shape = args.Shape;
46  int detailLevel = grid.GetLevelForDistance(args.ResolveDistErr(ctx, distErrPct));
47  var cells = grid.GetNodes(shape, detailLevel, false);
48  var filter = new TermsFilter();
49  foreach (Node cell in cells)
50  {
51  filter.AddTerm(new Term(GetFieldName(), cell.GetTokenString()));
52  }
53  return filter;
54  }
55  }
56 }