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<h1 id="Lucene_Net_Demo_Facet_SimpleFacetsExample" data-uid="Lucene.Net.Demo.Facet.SimpleFacetsExample" class="text-break">Class SimpleFacetsExample
</h1>
<div class="markdown level0 summary"><p>Shows simple usage of faceted indexing and search.</p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><span class="xref">System.Object</span></div>
<div class="level1"><span class="xref">SimpleFacetsExample</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">System.Object.Equals(System.Object)</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.GetHashCode()</span>
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<span class="xref">System.Object.GetType()</span>
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<span class="xref">System.Object.MemberwiseClone()</span>
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<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.ToString()</span>
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</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Demo.Facet.html">Lucene.Net.Demo.Facet</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Demo.dll</h6>
<h5 id="Lucene_Net_Demo_Facet_SimpleFacetsExample_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class SimpleFacetsExample</code></pre>
</div>
<h5 id="Lucene_Net_Demo_Facet_SimpleFacetsExample_examples"><strong>Examples</strong></h5>
<pre><code>using Lucene.Net.Analysis.Core;
using Lucene.Net.Documents;
using Lucene.Net.Facet;
using Lucene.Net.Facet.Taxonomy;
using Lucene.Net.Facet.Taxonomy.Directory;
using Lucene.Net.Index;
using Lucene.Net.Search;
using Lucene.Net.Store;
using Lucene.Net.Util;
using System;
using System.Collections.Generic;
namespace Lucene.Net.Demo.Facet
{
/// &lt;summary&gt;
/// Shows simple usage of faceted indexing and search.
/// &lt;/summary&gt;
public class SimpleFacetsExample
{
/// &lt;summary&gt;
/// Using a constant for all functionality related to a specific index
/// is the best strategy. This allows you to upgrade Lucene.Net first
/// and plan the upgrade of the index binary format for a later time.
/// Once the index is upgraded, you simply need to update the constant
/// version and redeploy your application.
/// &lt;/summary&gt;
private const LuceneVersion EXAMPLE_VERSION = LuceneVersion.LUCENE_48;
private readonly Directory indexDir = new RAMDirectory();
private readonly Directory taxoDir = new RAMDirectory();
private readonly FacetsConfig config = new FacetsConfig();
/// &lt;summary&gt;Constructor&lt;/summary&gt;
public SimpleFacetsExample()
{
config.SetHierarchical(&quot;Publish Date&quot;, true);
}
/// &lt;summary&gt;Build the example index.&lt;/summary&gt;
private void Index()
{
using (IndexWriter indexWriter = new IndexWriter(indexDir, new IndexWriterConfig(EXAMPLE_VERSION,
new WhitespaceAnalyzer(EXAMPLE_VERSION))))
// Writes facet ords to a separate directory from the main index
using (DirectoryTaxonomyWriter taxoWriter = new DirectoryTaxonomyWriter(taxoDir))
{
Document doc = new Document();
doc.Add(new FacetField(&quot;Author&quot;, &quot;Bob&quot;));
doc.Add(new FacetField(&quot;Publish Date&quot;, &quot;2010&quot;, &quot;10&quot;, &quot;15&quot;));
indexWriter.AddDocument(config.Build(taxoWriter, doc));
doc = new Document();
doc.Add(new FacetField(&quot;Author&quot;, &quot;Lisa&quot;));
doc.Add(new FacetField(&quot;Publish Date&quot;, &quot;2010&quot;, &quot;10&quot;, &quot;20&quot;));
indexWriter.AddDocument(config.Build(taxoWriter, doc));
doc = new Document();
doc.Add(new FacetField(&quot;Author&quot;, &quot;Lisa&quot;));
doc.Add(new FacetField(&quot;Publish Date&quot;, &quot;2012&quot;, &quot;1&quot;, &quot;1&quot;));
indexWriter.AddDocument(config.Build(taxoWriter, doc));
doc = new Document();
doc.Add(new FacetField(&quot;Author&quot;, &quot;Susan&quot;));
doc.Add(new FacetField(&quot;Publish Date&quot;, &quot;2012&quot;, &quot;1&quot;, &quot;7&quot;));
indexWriter.AddDocument(config.Build(taxoWriter, doc));
doc = new Document();
doc.Add(new FacetField(&quot;Author&quot;, &quot;Frank&quot;));
doc.Add(new FacetField(&quot;Publish Date&quot;, &quot;1999&quot;, &quot;5&quot;, &quot;5&quot;));
indexWriter.AddDocument(config.Build(taxoWriter, doc));
} // Disposes indexWriter and taxoWriter
}
/// &lt;summary&gt;User runs a query and counts facets.&lt;/summary&gt;
private IList&lt;FacetResult&gt; FacetsWithSearch()
{
using (DirectoryReader indexReader = DirectoryReader.Open(indexDir))
using (TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir))
{
IndexSearcher searcher = new IndexSearcher(indexReader);
FacetsCollector fc = new FacetsCollector();
// MatchAllDocsQuery is for &quot;browsing&quot; (counts facets
// for all non-deleted docs in the index); normally
// you&#39;d use a &quot;normal&quot; query:
FacetsCollector.Search(searcher, new MatchAllDocsQuery(), 10, fc);
// Retrieve results
IList&lt;FacetResult&gt; results = new List&lt;FacetResult&gt;();
// Count both &quot;Publish Date&quot; and &quot;Author&quot; dimensions
Facets facets = new FastTaxonomyFacetCounts(taxoReader, config, fc);
results.Add(facets.GetTopChildren(10, &quot;Author&quot;));
results.Add(facets.GetTopChildren(10, &quot;Publish Date&quot;));
return results;
} // Disposes indexReader and taxoReader
}
/// &lt;summary&gt;User runs a query and counts facets only without collecting the matching documents.&lt;/summary&gt;
private IList&lt;FacetResult&gt; FacetsOnly()
{
using (DirectoryReader indexReader = DirectoryReader.Open(indexDir))
using (TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir))
{
IndexSearcher searcher = new IndexSearcher(indexReader);
FacetsCollector fc = new FacetsCollector();
// MatchAllDocsQuery is for &quot;browsing&quot; (counts facets
// for all non-deleted docs in the index); normally
// you&#39;d use a &quot;normal&quot; query:
searcher.Search(new MatchAllDocsQuery(), null /*Filter */, fc);
// Retrieve results
IList&lt;FacetResult&gt; results = new List&lt;FacetResult&gt;();
// Count both &quot;Publish Date&quot; and &quot;Author&quot; dimensions
Facets facets = new FastTaxonomyFacetCounts(taxoReader, config, fc);
results.Add(facets.GetTopChildren(10, &quot;Author&quot;));
results.Add(facets.GetTopChildren(10, &quot;Publish Date&quot;));
return results;
} // Disposes indexReader and taxoReader
}
/// &lt;summary&gt;
/// User drills down on &#39;Publish Date/2010&#39;, and we
/// return facets for &#39;Author&#39;
/// &lt;/summary&gt;
private FacetResult DrillDown()
{
using (DirectoryReader indexReader = DirectoryReader.Open(indexDir))
using (TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir))
{
IndexSearcher searcher = new IndexSearcher(indexReader);
// Passing no baseQuery means we drill down on all
// documents (&quot;browse only&quot;):
DrillDownQuery q = new DrillDownQuery(config);
// Now user drills down on Publish Date/2010:
q.Add(&quot;Publish Date&quot;, &quot;2010&quot;);
FacetsCollector fc = new FacetsCollector();
FacetsCollector.Search(searcher, q, 10, fc);
// Retrieve results
Facets facets = new FastTaxonomyFacetCounts(taxoReader, config, fc);
FacetResult result = facets.GetTopChildren(10, &quot;Author&quot;);
return result;
} // Disposes indexReader and taxoReader
}
/// &lt;summary&gt;
/// User drills down on &#39;Publish Date/2010&#39;, and we
/// return facets for both &#39;Publish Date&#39; and &#39;Author&#39;,
/// using DrillSideways.
/// &lt;/summary&gt;
private IList&lt;FacetResult&gt; DrillSideways()
{
using (DirectoryReader indexReader = DirectoryReader.Open(indexDir))
using (TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir))
{
IndexSearcher searcher = new IndexSearcher(indexReader);
// Passing no baseQuery means we drill down on all
// documents (&quot;browse only&quot;):
DrillDownQuery q = new DrillDownQuery(config);
// Now user drills down on Publish Date/2010:
q.Add(&quot;Publish Date&quot;, &quot;2010&quot;);
DrillSideways ds = new DrillSideways(searcher, config, taxoReader);
DrillSidewaysResult result = ds.Search(q, 10);
// Retrieve results
IList&lt;FacetResult&gt; facets = result.Facets.GetAllDims(10);
return facets;
} // Disposes indexReader and taxoReader
}
/// &lt;summary&gt;Runs the search example.&lt;/summary&gt;
public IList&lt;FacetResult&gt; RunFacetOnly()
{
Index();
return FacetsOnly();
}
/// &lt;summary&gt;Runs the search example.&lt;/summary&gt;
public IList&lt;FacetResult&gt; RunSearch()
{
Index();
return FacetsWithSearch();
}
/// &lt;summary&gt;Runs the drill-down example.&lt;/summary&gt;
public FacetResult RunDrillDown()
{
Index();
return DrillDown();
}
/// &lt;summary&gt;Runs the drill-sideways example.&lt;/summary&gt;
public IList&lt;FacetResult&gt; RunDrillSideways()
{
Index();
return DrillSideways();
}
/// &lt;summary&gt;Runs the search and drill-down examples and prints the results.&lt;/summary&gt;
public static void Main(string[] args)
{
Console.WriteLine(&quot;Facet counting example:&quot;);
Console.WriteLine(&quot;-----------------------&quot;);
SimpleFacetsExample example1 = new SimpleFacetsExample();
IList&lt;FacetResult&gt; results1 = example1.RunFacetOnly();
Console.WriteLine(&quot;Author: &quot; + results1[0]);
Console.WriteLine(&quot;Publish Date: &quot; + results1[1]);
Console.WriteLine(&quot;Facet counting example (combined facets and search):&quot;);
Console.WriteLine(&quot;-----------------------&quot;);
SimpleFacetsExample example = new SimpleFacetsExample();
IList&lt;FacetResult&gt; results = example.RunSearch();
Console.WriteLine(&quot;Author: &quot; + results[0]);
Console.WriteLine(&quot;Publish Date: &quot; + results[1]);
Console.WriteLine();
Console.WriteLine(&quot;Facet drill-down example (Publish Date/2010):&quot;);
Console.WriteLine(&quot;---------------------------------------------&quot;);
Console.WriteLine(&quot;Author: &quot; + example.RunDrillDown());
Console.WriteLine();
Console.WriteLine(&quot;Facet drill-sideways example (Publish Date/2010):&quot;);
Console.WriteLine(&quot;---------------------------------------------&quot;);
foreach (FacetResult result in example.RunDrillSideways())
{
Console.WriteLine(result);
}
}
}
}
</code></pre>
<h3 id="constructors">Constructors
</h3>
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<h4 id="Lucene_Net_Demo_Facet_SimpleFacetsExample__ctor" data-uid="Lucene.Net.Demo.Facet.SimpleFacetsExample.#ctor">SimpleFacetsExample()</h4>
<div class="markdown level1 summary"><p>Constructor</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public SimpleFacetsExample()</code></pre>
</div>
<h3 id="methods">Methods
</h3>
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<h4 id="Lucene_Net_Demo_Facet_SimpleFacetsExample_Main_System_String___" data-uid="Lucene.Net.Demo.Facet.SimpleFacetsExample.Main(System.String[])">Main(String[])</h4>
<div class="markdown level1 summary"><p>Runs the search and drill-down examples and prints the results.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static void Main(string[] args)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.String</span>[]</td>
<td><span class="parametername">args</span></td>
<td></td>
</tr>
</tbody>
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<h4 id="Lucene_Net_Demo_Facet_SimpleFacetsExample_RunDrillDown" data-uid="Lucene.Net.Demo.Facet.SimpleFacetsExample.RunDrillDown">RunDrillDown()</h4>
<div class="markdown level1 summary"><p>Runs the drill-down example.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public FacetResult RunDrillDown()</code></pre>
</div>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="../Lucene.Net.Facet/Lucene.Net.Facet.FacetResult.html">FacetResult</a></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Demo_Facet_SimpleFacetsExample_RunDrillSideways" data-uid="Lucene.Net.Demo.Facet.SimpleFacetsExample.RunDrillSideways">RunDrillSideways()</h4>
<div class="markdown level1 summary"><p>Runs the drill-sideways example.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public IList&lt;FacetResult&gt; RunDrillSideways()</code></pre>
</div>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Collections.Generic.IList</span>&lt;<a class="xref" href="../Lucene.Net.Facet/Lucene.Net.Facet.FacetResult.html">FacetResult</a>&gt;</td>
<td></td>
</tr>
</tbody>
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<h4 id="Lucene_Net_Demo_Facet_SimpleFacetsExample_RunFacetOnly" data-uid="Lucene.Net.Demo.Facet.SimpleFacetsExample.RunFacetOnly">RunFacetOnly()</h4>
<div class="markdown level1 summary"><p>Runs the search example.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public IList&lt;FacetResult&gt; RunFacetOnly()</code></pre>
</div>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Collections.Generic.IList</span>&lt;<a class="xref" href="../Lucene.Net.Facet/Lucene.Net.Facet.FacetResult.html">FacetResult</a>&gt;</td>
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</tr>
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<a id="Lucene_Net_Demo_Facet_SimpleFacetsExample_RunSearch_" data-uid="Lucene.Net.Demo.Facet.SimpleFacetsExample.RunSearch*"></a>
<h4 id="Lucene_Net_Demo_Facet_SimpleFacetsExample_RunSearch" data-uid="Lucene.Net.Demo.Facet.SimpleFacetsExample.RunSearch">RunSearch()</h4>
<div class="markdown level1 summary"><p>Runs the search example.</p>
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<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public IList&lt;FacetResult&gt; RunSearch()</code></pre>
</div>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
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<th>Type</th>
<th>Description</th>
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<tbody>
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<td><span class="xref">System.Collections.Generic.IList</span>&lt;<a class="xref" href="../Lucene.Net.Facet/Lucene.Net.Facet.FacetResult.html">FacetResult</a>&gt;</td>
<td></td>
</tr>
</tbody>
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<a href="https://github.com/Shazwazza/lucenenet/blob/docs-update-jan2020/src/Lucene.Net.Demo/Facet/SimpleFacetsExample.cs/#L40" class="contribution-link">View Source</a>
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