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| Apache Lucene.NET 4.8.0-beta00010 Documentation </title>
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<article class="content wrap" id="_content" data-uid="Lucene.Net.Queries.Function.ValueSource">
<h1 id="Lucene_Net_Queries_Function_ValueSource" data-uid="Lucene.Net.Queries.Function.ValueSource" class="text-break">Class ValueSource
</h1>
<div class="markdown level0 summary"><p>Instantiates <a class="xref" href="Lucene.Net.Queries.Function.FunctionValues.html">FunctionValues</a> for a particular reader.
<p>
Often used when creating a <a class="xref" href="Lucene.Net.Queries.Function.FunctionQuery.html">FunctionQuery</a>.</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">ValueSource</span></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.BoolFunction.html">BoolFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.ConstNumberSource.html">ConstNumberSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.DocFreqValueSource.html">DocFreqValueSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.DualSingleFunction.html">DualSingleFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.FieldCacheSource.html">FieldCacheSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.LinearSingleFunction.html">LinearSingleFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.LiteralValueSource.html">LiteralValueSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.MaxDocValueSource.html">MaxDocValueSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.MultiFunction.html">MultiFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.MultiSingleFunction.html">MultiSingleFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.MultiValueSource.html">MultiValueSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.NormValueSource.html">NormValueSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.NumDocsValueSource.html">NumDocsValueSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.OrdFieldSource.html">OrdFieldSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.QueryValueSource.html">QueryValueSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.RangeMapSingleFunction.html">RangeMapSingleFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.ReciprocalSingleFunction.html">ReciprocalSingleFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.ReverseOrdFieldSource.html">ReverseOrdFieldSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.ScaleSingleFunction.html">ScaleSingleFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.SingularFunction.html">SingularFunction</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.SumTotalTermFreqValueSource.html">SumTotalTermFreqValueSource</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Queries.Function.ValueSources.TotalTermFreqValueSource.html">TotalTermFreqValueSource</a></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</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>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Queries.Function.html">Lucene.Net.Queries.Function</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Queries.dll</h6>
<h5 id="Lucene_Net_Queries_Function_ValueSource_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class ValueSource</code></pre>
</div>
<h3 id="methods">Methods
</h3>
<span class="small pull-right mobile-hide">
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<a id="Lucene_Net_Queries_Function_ValueSource_CreateWeight_" data-uid="Lucene.Net.Queries.Function.ValueSource.CreateWeight*"></a>
<h4 id="Lucene_Net_Queries_Function_ValueSource_CreateWeight_System_Collections_IDictionary_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Queries.Function.ValueSource.CreateWeight(System.Collections.IDictionary,Lucene.Net.Search.IndexSearcher)">CreateWeight(IDictionary, IndexSearcher)</h4>
<div class="markdown level1 summary"><p>Implementations should propagate CreateWeight to sub-ValueSources which can optionally store
weight info in the context. The context object will be passed to GetValues()
where this info can be retrieved.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual void CreateWeight(IDictionary context, IndexSearcher searcher)</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.Collections.IDictionary</span></td>
<td><span class="parametername">context</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.IndexSearcher</span></td>
<td><span class="parametername">searcher</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Function_ValueSource_Equals_" data-uid="Lucene.Net.Queries.Function.ValueSource.Equals*"></a>
<h4 id="Lucene_Net_Queries_Function_ValueSource_Equals_System_Object_" data-uid="Lucene.Net.Queries.Function.ValueSource.Equals(System.Object)">Equals(Object)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract override bool Equals(object o)</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.Object</span></td>
<td><span class="parametername">o</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">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">System.Object.Equals(System.Object)</span></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_Queries_Function_ValueSource_GetDescription.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Function.ValueSource.GetDescription%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.Queries/Function/ValueSource.cs/#L46">View Source</a>
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<a id="Lucene_Net_Queries_Function_ValueSource_GetDescription_" data-uid="Lucene.Net.Queries.Function.ValueSource.GetDescription*"></a>
<h4 id="Lucene_Net_Queries_Function_ValueSource_GetDescription" data-uid="Lucene.Net.Queries.Function.ValueSource.GetDescription">GetDescription()</h4>
<div class="markdown level1 summary"><p>description of field, used in Explain()</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract string GetDescription()</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.String</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Function_ValueSource_GetHashCode_" data-uid="Lucene.Net.Queries.Function.ValueSource.GetHashCode*"></a>
<h4 id="Lucene_Net_Queries_Function_ValueSource_GetHashCode" data-uid="Lucene.Net.Queries.Function.ValueSource.GetHashCode">GetHashCode()</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract override int GetHashCode()</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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">System.Object.GetHashCode()</span></div>
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<a id="Lucene_Net_Queries_Function_ValueSource_GetSortField_" data-uid="Lucene.Net.Queries.Function.ValueSource.GetSortField*"></a>
<h4 id="Lucene_Net_Queries_Function_ValueSource_GetSortField_System_Boolean_" data-uid="Lucene.Net.Queries.Function.ValueSource.GetSortField(System.Boolean)">GetSortField(Boolean)</h4>
<div class="markdown level1 summary"><p>EXPERIMENTAL: This method is subject to change.
<p>
Get the <span class="xref">Lucene.Net.Search.SortField</span> for this <a class="xref" href="Lucene.Net.Queries.Function.ValueSource.html">ValueSource</a>. Uses the <a class="xref" href="Lucene.Net.Queries.Function.ValueSource.html#Lucene_Net_Queries_Function_ValueSource_GetValues_System_Collections_IDictionary_Lucene_Net_Index_AtomicReaderContext_">GetValues(IDictionary, AtomicReaderContext)</a>
to populate the <span class="xref">Lucene.Net.Search.SortField</span>.</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(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><span class="xref">System.Boolean</span></td>
<td><span class="parametername">reverse</span></td>
<td><p><code>true</code> if this is a reverse sort. </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.Search.SortField</span></td>
<td><p>The <span class="xref">Lucene.Net.Search.SortField</span> for the <a class="xref" href="Lucene.Net.Queries.Function.ValueSource.html">ValueSource</a> </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Function_ValueSource_GetValues_" data-uid="Lucene.Net.Queries.Function.ValueSource.GetValues*"></a>
<h4 id="Lucene_Net_Queries_Function_ValueSource_GetValues_System_Collections_IDictionary_Lucene_Net_Index_AtomicReaderContext_" data-uid="Lucene.Net.Queries.Function.ValueSource.GetValues(System.Collections.IDictionary,Lucene.Net.Index.AtomicReaderContext)">GetValues(IDictionary, AtomicReaderContext)</h4>
<div class="markdown level1 summary"><p>Gets the values for this reader and the context that was previously
passed to <a class="xref" href="Lucene.Net.Queries.Function.ValueSource.html#Lucene_Net_Queries_Function_ValueSource_CreateWeight_System_Collections_IDictionary_Lucene_Net_Search_IndexSearcher_">CreateWeight(IDictionary, IndexSearcher)</a></p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract FunctionValues GetValues(IDictionary context, AtomicReaderContext readerContext)</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.Collections.IDictionary</span></td>
<td><span class="parametername">context</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Index.AtomicReaderContext</span></td>
<td><span class="parametername">readerContext</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><a class="xref" href="Lucene.Net.Queries.Function.FunctionValues.html">FunctionValues</a></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Function_ValueSource_NewContext_" data-uid="Lucene.Net.Queries.Function.ValueSource.NewContext*"></a>
<h4 id="Lucene_Net_Queries_Function_ValueSource_NewContext_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Queries.Function.ValueSource.NewContext(Lucene.Net.Search.IndexSearcher)">NewContext(IndexSearcher)</h4>
<div class="markdown level1 summary"><p>Returns a new non-threadsafe context map.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IDictionary NewContext(IndexSearcher searcher)</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">Lucene.Net.Search.IndexSearcher</span></td>
<td><span class="parametername">searcher</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">System.Collections.IDictionary</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Function_ValueSource_ToString_" data-uid="Lucene.Net.Queries.Function.ValueSource.ToString*"></a>
<h4 id="Lucene_Net_Queries_Function_ValueSource_ToString" data-uid="Lucene.Net.Queries.Function.ValueSource.ToString">ToString()</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override string ToString()</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.String</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">System.Object.ToString()</span></div>
</article>
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