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| <article class="content wrap" id="_content" data-uid="Lucene.Net.Demo.Facet.ExpressionAggregationFacetsExample"> |
| |
| |
| <h1 id="Lucene_Net_Demo_Facet_ExpressionAggregationFacetsExample" data-uid="Lucene.Net.Demo.Facet.ExpressionAggregationFacetsExample" class="text-break">Class ExpressionAggregationFacetsExample |
| </h1> |
| <div class="markdown level0 summary"><p>Shows facets aggregation by an expression.</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">ExpressionAggregationFacetsExample</span></div> |
| </div> |
| <div class="inheritedMembers"> |
| <h5>Inherited Members</h5> |
| <div> |
| <span class="xref">System.Object.Equals(System.Object)</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> |
| </div> |
| </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_ExpressionAggregationFacetsExample_syntax">Syntax</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public class ExpressionAggregationFacetsExample</code></pre> |
| </div> |
| <h5 id="Lucene_Net_Demo_Facet_ExpressionAggregationFacetsExample_examples"><strong>Examples</strong></h5> |
| <pre><code>using Lucene.Net.Analysis.Core; |
| using Lucene.Net.Documents; |
| using Lucene.Net.Expressions; |
| using Lucene.Net.Expressions.JS; |
| 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; |
| |
| namespace Lucene.Net.Demo.Facet |
| { |
| /// <summary> |
| /// Shows facets aggregation by an expression. |
| /// </summary> |
| public class ExpressionAggregationFacetsExample |
| { |
| /// <summary> |
| /// 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. |
| /// </summary> |
| 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(); |
| |
| /// <summary>Build the example index.</summary> |
| 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 TextField("c", "foo bar", Field.Store.NO)); |
| doc.Add(new NumericDocValuesField("popularity", 5L)); |
| doc.Add(new FacetField("A", "B")); |
| indexWriter.AddDocument(config.Build(taxoWriter, doc)); |
| |
| doc = new Document(); |
| doc.Add(new TextField("c", "foo foo bar", Field.Store.NO)); |
| doc.Add(new NumericDocValuesField("popularity", 3L)); |
| doc.Add(new FacetField("A", "C")); |
| indexWriter.AddDocument(config.Build(taxoWriter, doc)); |
| |
| } // Disposes indexWriter and taxoWriter |
| } |
| |
| /// <summary>User runs a query and aggregates facets.</summary> |
| private FacetResult Search() |
| { |
| using (DirectoryReader indexReader = DirectoryReader.Open(indexDir)) |
| using (TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir)) |
| { |
| IndexSearcher searcher = new IndexSearcher(indexReader); |
| |
| // Aggregate categories by an expression that combines the document's score |
| // and its popularity field |
| Expression expr = JavascriptCompiler.Compile("_score * sqrt(popularity)"); |
| SimpleBindings bindings = new SimpleBindings(); |
| bindings.Add(new SortField("_score", SortFieldType.SCORE)); // the score of the document |
| bindings.Add(new SortField("popularity", SortFieldType.INT64)); // the value of the 'popularity' field |
| |
| // Aggregates the facet values |
| FacetsCollector fc = new FacetsCollector(true); |
| |
| // MatchAllDocsQuery is for "browsing" (counts facets |
| // for all non-deleted docs in the index); normally |
| // you'd use a "normal" query: |
| FacetsCollector.Search(searcher, new MatchAllDocsQuery(), 10, fc); |
| |
| // Retrieve results |
| Facets facets = new TaxonomyFacetSumValueSource(taxoReader, config, fc, expr.GetValueSource(bindings)); |
| FacetResult result = facets.GetTopChildren(10, "A"); |
| |
| return result; |
| |
| } // Disposes indexReader and taxoReader |
| } |
| |
| /// <summary>Runs the search example.</summary> |
| public FacetResult RunSearch() |
| { |
| Index(); |
| return Search(); |
| } |
| |
| /// <summary>Runs the search and drill-down examples and prints the results.</summary> |
| public static void Main(string[] args) |
| { |
| Console.WriteLine("Facet counting example:"); |
| Console.WriteLine("-----------------------"); |
| FacetResult result = new ExpressionAggregationFacetsExample().RunSearch(); |
| Console.WriteLine(result); |
| } |
| } |
| } |
| </code></pre> |
| <h3 id="methods">Methods |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00008/websites/apidocs/apiSpec/new?filename=Lucene_Net_Demo_Facet_ExpressionAggregationFacetsExample_Main_System_String___.md&value=---%0Auid%3A%20Lucene.Net.Demo.Facet.ExpressionAggregationFacetsExample.Main(System.String%5B%5D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/Shazwazza/lucenenet/blob/docs-may/src/Lucene.Net.Demo/Facet/ExpressionAggregationFacetsExample.cs/#L121">View Source</a> |
| </span> |
| <a id="Lucene_Net_Demo_Facet_ExpressionAggregationFacetsExample_Main_" data-uid="Lucene.Net.Demo.Facet.ExpressionAggregationFacetsExample.Main*"></a> |
| <h4 id="Lucene_Net_Demo_Facet_ExpressionAggregationFacetsExample_Main_System_String___" data-uid="Lucene.Net.Demo.Facet.ExpressionAggregationFacetsExample.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> |
| </table> |
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| <span class="divider">|</span> |
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| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/Shazwazza/lucenenet/blob/docs-may/src/Lucene.Net.Demo/Facet/ExpressionAggregationFacetsExample.cs/#L114">View Source</a> |
| </span> |
| <a id="Lucene_Net_Demo_Facet_ExpressionAggregationFacetsExample_RunSearch_" data-uid="Lucene.Net.Demo.Facet.ExpressionAggregationFacetsExample.RunSearch*"></a> |
| <h4 id="Lucene_Net_Demo_Facet_ExpressionAggregationFacetsExample_RunSearch" data-uid="Lucene.Net.Demo.Facet.ExpressionAggregationFacetsExample.RunSearch">RunSearch()</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 FacetResult RunSearch()</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> |
| </article> |
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