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| |
| <h1 id="Lucene_Net_Expressions_Expression" data-uid="Lucene.Net.Expressions.Expression" class="text-break">Class Expression |
| </h1> |
| <div class="markdown level0 summary"><p>Base class that computes the value of an expression for a document.</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">Expression</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> |
| </div> |
| <div> |
| <span class="xref">System.Object.GetType()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.MemberwiseClone()</span> |
| </div> |
| <div> |
| <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="overview.html">Lucene.Net.Expressions</a></h6> |
| <h6><strong>Assembly</strong>: Lucene.Net.Expressions.dll</h6> |
| <h5 id="Lucene_Net_Expressions_Expression_syntax">Syntax</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public abstract class Expression</code></pre> |
| </div> |
| <h5 id="Lucene_Net_Expressions_Expression_remarks"><strong>Remarks</strong></h5> |
| <div class="markdown level0 remarks"><p>Base class that computes the value of an expression for a document. |
| <p> |
| Example usage:</p> |
| <pre><code>// compile an expression: |
| Expression expr = JavascriptCompiler.Compile("sqrt(_score) + ln(popularity)"); |
| // SimpleBindings just maps variables to SortField instances |
| SimpleBindings bindings = new SimpleBindings(); |
| bindings.Add(new SortField("_score", SortFieldType.SCORE)); |
| bindings.Add(new SortField("popularity", SortFieldType.INT)); |
| // create a sort field and sort by it (reverse order) |
| Sort sort = new Sort(expr.GetSortField(bindings, true)); |
| Query query = new TermQuery(new Term("body", "contents")); |
| searcher.Search(query, null, 10, sort);</code></pre> |
| <div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></div> |
| <h3 id="constructors">Constructors |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Expressions_Expression__ctor_System_String_System_String___.md&value=---%0Auid%3A%20Lucene.Net.Expressions.Expression.%23ctor(System.String%2CSystem.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> |
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| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Expressions/Expression.cs/#L65">View Source</a> |
| </span> |
| <a id="Lucene_Net_Expressions_Expression__ctor_" data-uid="Lucene.Net.Expressions.Expression.#ctor*"></a> |
| <h4 id="Lucene_Net_Expressions_Expression__ctor_System_String_System_String___" data-uid="Lucene.Net.Expressions.Expression.#ctor(System.String,System.String[])">Expression(String, String[])</h4> |
| <div class="markdown level1 summary"><p>Creates a new <a class="xref" href="Lucene.Net.Expressions.Expression.html">Expression</a>.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public Expression(string sourceText, string[] variables)</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">sourceText</span></td> |
| <td><p>Source text for the expression: e.g. |
| <code>ln(popularity)</code></p> |
| </td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.String</span>[]</td> |
| <td><span class="parametername">variables</span></td> |
| <td><p>Names of external variables referred to by the expression</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <h3 id="properties">Properties |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Expressions_Expression_SourceText.md&value=---%0Auid%3A%20Lucene.Net.Expressions.Expression.SourceText%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> |
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| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Expressions/Expression.cs/#L48">View Source</a> |
| </span> |
| <a id="Lucene_Net_Expressions_Expression_SourceText_" data-uid="Lucene.Net.Expressions.Expression.SourceText*"></a> |
| <h4 id="Lucene_Net_Expressions_Expression_SourceText" data-uid="Lucene.Net.Expressions.Expression.SourceText">SourceText</h4> |
| <div class="markdown level1 summary"><p>The original source text</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public string SourceText { get; }</code></pre> |
| </div> |
| <h5 class="propertyValue">Property Value</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.String</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Expressions_Expression_Variables.md&value=---%0Auid%3A%20Lucene.Net.Expressions.Expression.Variables%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> |
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| </span> |
| <a id="Lucene_Net_Expressions_Expression_Variables_" data-uid="Lucene.Net.Expressions.Expression.Variables*"></a> |
| <h4 id="Lucene_Net_Expressions_Expression_Variables" data-uid="Lucene.Net.Expressions.Expression.Variables">Variables</h4> |
| <div class="markdown level1 summary"><p>Named variables referred to by this expression</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public string[] Variables { get; }</code></pre> |
| </div> |
| <h5 class="propertyValue">Property Value</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.String</span>[]</td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Expressions_Expression_Evaluate_System_Int32_Lucene_Net_Queries_Function_FunctionValues___.md&value=---%0Auid%3A%20Lucene.Net.Expressions.Expression.Evaluate(System.Int32%2CLucene.Net.Queries.Function.FunctionValues%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> |
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| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Expressions/Expression.cs/#L80">View Source</a> |
| </span> |
| <a id="Lucene_Net_Expressions_Expression_Evaluate_" data-uid="Lucene.Net.Expressions.Expression.Evaluate*"></a> |
| <h4 id="Lucene_Net_Expressions_Expression_Evaluate_System_Int32_Lucene_Net_Queries_Function_FunctionValues___" data-uid="Lucene.Net.Expressions.Expression.Evaluate(System.Int32,Lucene.Net.Queries.Function.FunctionValues[])">Evaluate(Int32, FunctionValues[])</h4> |
| <div class="markdown level1 summary"><p>Evaluates the expression for the given document.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public abstract double Evaluate(int document, FunctionValues[] functionValues)</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.Int32</span></td> |
| <td><span class="parametername">document</span></td> |
| <td><p><code>docId</code> of the document to compute a value for</p> |
| </td> |
| </tr> |
| <tr> |
| <td><span class="xref">Lucene.Net.Queries.Function.FunctionValues</span>[]</td> |
| <td><span class="parametername">functionValues</span></td> |
| <td><p><span class="xref">Lucene.Net.Queries.Function.FunctionValues</span> |
| for each element of <a class="xref" href="Lucene.Net.Expressions.Expression.html#Lucene_Net_Expressions_Expression_Variables">Variables</a>.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <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.Double</span></td> |
| <td><p>The computed value of the expression for the given document.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 id="Lucene_Net_Expressions_Expression_Evaluate_System_Int32_Lucene_Net_Queries_Function_FunctionValues____remarks">Remarks</h5> |
| <div class="markdown level1 remarks"><p>Evaluates the expression for the given document.</p> |
| </div> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Expressions_Expression_GetRescorer_Lucene_Net_Expressions_Bindings_.md&value=---%0Auid%3A%20Lucene.Net.Expressions.Expression.GetRescorer(Lucene.Net.Expressions.Bindings)%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> |
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| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Expressions/Expression.cs/#L102">View Source</a> |
| </span> |
| <a id="Lucene_Net_Expressions_Expression_GetRescorer_" data-uid="Lucene.Net.Expressions.Expression.GetRescorer*"></a> |
| <h4 id="Lucene_Net_Expressions_Expression_GetRescorer_Lucene_Net_Expressions_Bindings_" data-uid="Lucene.Net.Expressions.Expression.GetRescorer(Lucene.Net.Expressions.Bindings)">GetRescorer(Bindings)</h4> |
| <div class="markdown level1 summary"><p>Get a <span class="xref">Lucene.Net.Search.Rescorer</span>, to rescore first-pass hits |
| using this expression.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual Rescorer GetRescorer(Bindings bindings)</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><a class="xref" href="Lucene.Net.Expressions.Bindings.html">Bindings</a></td> |
| <td><span class="parametername">bindings</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <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">Lucene.Net.Search.Rescorer</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Expressions_Expression_GetSortField_Lucene_Net_Expressions_Bindings_System_Boolean_.md&value=---%0Auid%3A%20Lucene.Net.Expressions.Expression.GetSortField(Lucene.Net.Expressions.Bindings%2CSystem.Boolean)%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> |
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| </span> |
| <a id="Lucene_Net_Expressions_Expression_GetSortField_" data-uid="Lucene.Net.Expressions.Expression.GetSortField*"></a> |
| <h4 id="Lucene_Net_Expressions_Expression_GetSortField_Lucene_Net_Expressions_Bindings_System_Boolean_" data-uid="Lucene.Net.Expressions.Expression.GetSortField(Lucene.Net.Expressions.Bindings,System.Boolean)">GetSortField(Bindings, Boolean)</h4> |
| <div class="markdown level1 summary"><p>Get a sort field which can be used to rank documents by this expression.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual SortField GetSortField(Bindings bindings, bool reverse)</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><a class="xref" href="Lucene.Net.Expressions.Bindings.html">Bindings</a></td> |
| <td><span class="parametername">bindings</span></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Boolean</span></td> |
| <td><span class="parametername">reverse</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <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">Lucene.Net.Search.SortField</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 id="Lucene_Net_Expressions_Expression_GetSortField_Lucene_Net_Expressions_Bindings_System_Boolean__remarks">Remarks</h5> |
| <div class="markdown level1 remarks"><p>Get a sort field which can be used to rank documents by this expression.</p> |
| </div> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
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| </span> |
| <a id="Lucene_Net_Expressions_Expression_GetValueSource_" data-uid="Lucene.Net.Expressions.Expression.GetValueSource*"></a> |
| <h4 id="Lucene_Net_Expressions_Expression_GetValueSource_Lucene_Net_Expressions_Bindings_" data-uid="Lucene.Net.Expressions.Expression.GetValueSource(Lucene.Net.Expressions.Bindings)">GetValueSource(Bindings)</h4> |
| <div class="markdown level1 summary"><p>Get a value source which can compute the value of this expression in the context of the given bindings.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual ValueSource GetValueSource(Bindings bindings)</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><a class="xref" href="Lucene.Net.Expressions.Bindings.html">Bindings</a></td> |
| <td><span class="parametername">bindings</span></td> |
| <td><p>Bindings to use for external values in this expression</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <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">Lucene.Net.Queries.Function.ValueSource</span></td> |
| <td><p>A value source which will evaluate this expression when used</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 id="Lucene_Net_Expressions_Expression_GetValueSource_Lucene_Net_Expressions_Bindings__remarks">Remarks</h5> |
| <div class="markdown level1 remarks"><p>Get a value source which can compute the value of this expression in the context of the given bindings.</p> |
| </div> |
| <h3 id="seealso">See Also</h3> |
| <div class="seealso"> |
| <div><a class="xref" href="Lucene.Net.Expressions.JS.JavascriptCompiler.html#Lucene_Net_Expressions_JS_JavascriptCompiler_Compile_System_String_">Compile(String)</a></div> |
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