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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1">
<h1 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1" class="text-break">Class AbstractSecondPassGroupingCollector&lt;TGroupValue&gt;
</h1>
<div class="markdown level0 summary"><p>SecondPassGroupingCollector is the second of two passes
necessary to collect grouped docs. This pass gathers the
top N documents per top group computed from the
first pass. Concrete subclasses define what a group is and how it
is internally collected.
<p>
See <a href="https://github.com/apache/lucene-solr/blob/releases/lucene-solr/4.8.0/lucene/grouping/src/java/org/apache/lucene/search/grouping/package.html">org.apache.lucene.search.grouping</a> for more
details including a full code example.
</p></p>
<div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></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">AbstractSecondPassGroupingCollector&lt;TGroupValue&gt;</span></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Grouping.Function.FunctionSecondPassGroupingCollector.html">FunctionSecondPassGroupingCollector</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Grouping.Terms.TermSecondPassGroupingCollector.html">TermSecondPassGroupingCollector</a></div>
</div>
<div classs="implements">
<h5>Implements</h5>
<div><a class="xref" href="Lucene.Net.Search.Grouping.IAbstractSecondPassGroupingCollector-1.html">IAbstractSecondPassGroupingCollector</a>&lt;TGroupValue&gt;</div>
<div><span class="xref">Lucene.Net.Search.ICollector</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="Lucene.Net.Search.Grouping.html">Lucene.Net.Search.Grouping</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Grouping.dll</h6>
<h5 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class AbstractSecondPassGroupingCollector&lt;TGroupValue&gt; : IAbstractSecondPassGroupingCollector&lt;TGroupValue&gt;, ICollector</code></pre>
</div>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">TGroupValue</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1__ctor_" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.#ctor*"></a>
<h4 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1__ctor_System_Collections_Generic_IEnumerable_Lucene_Net_Search_Grouping_ISearchGroup__0___Lucene_Net_Search_Sort_Lucene_Net_Search_Sort_System_Int32_System_Boolean_System_Boolean_System_Boolean_" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.#ctor(System.Collections.Generic.IEnumerable{Lucene.Net.Search.Grouping.ISearchGroup{`0}},Lucene.Net.Search.Sort,Lucene.Net.Search.Sort,System.Int32,System.Boolean,System.Boolean,System.Boolean)">AbstractSecondPassGroupingCollector(IEnumerable&lt;ISearchGroup&lt;TGroupValue&gt;&gt;, Sort, Sort, Int32, Boolean, Boolean, Boolean)</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 AbstractSecondPassGroupingCollector(IEnumerable&lt;ISearchGroup&lt;TGroupValue&gt;&gt; groups, Sort groupSort, Sort withinGroupSort, int maxDocsPerGroup, bool getScores, bool getMaxScores, bool fillSortFields)</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.Generic.IEnumerable</span>&lt;<a class="xref" href="Lucene.Net.Search.Grouping.ISearchGroup-1.html">ISearchGroup</a>&lt;TGroupValue&gt;&gt;</td>
<td><span class="parametername">groups</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Sort</span></td>
<td><span class="parametername">groupSort</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Sort</span></td>
<td><span class="parametername">withinGroupSort</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">maxDocsPerGroup</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">getScores</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">getMaxScores</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">fillSortFields</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="fields">Fields
</h3>
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<h4 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_m_groupDocs" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.m_groupDocs">m_groupDocs</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">protected AbstractSecondPassGroupingCollector.SearchGroupDocs&lt;TGroupValue&gt;[] m_groupDocs</code></pre>
</div>
<h5 class="fieldValue">Field Value</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.Search.Grouping.AbstractSecondPassGroupingCollector.SearchGroupDocs-1.html">AbstractSecondPassGroupingCollector.SearchGroupDocs</a>&lt;TGroupValue&gt;[]</td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_m_groupMap" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.m_groupMap">m_groupMap</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">protected readonly IDictionary&lt;TGroupValue, AbstractSecondPassGroupingCollector.SearchGroupDocs&lt;TGroupValue&gt;&gt; m_groupMap</code></pre>
</div>
<h5 class="fieldValue">Field 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.Collections.Generic.IDictionary</span>&lt;TGroupValue, <a class="xref" href="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector.SearchGroupDocs-1.html">AbstractSecondPassGroupingCollector.SearchGroupDocs</a>&lt;TGroupValue&gt;&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
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<h4 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_AcceptsDocsOutOfOrder" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.AcceptsDocsOutOfOrder">AcceptsDocsOutOfOrder</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 virtual bool AcceptsDocsOutOfOrder { 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.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_Collect_" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.Collect*"></a>
<h4 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_Collect_System_Int32_" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.Collect(System.Int32)">Collect(Int32)</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 virtual void Collect(int doc)</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">doc</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_GetTopGroups_System_Int32_" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.GetTopGroups(System.Int32)">GetTopGroups(Int32)</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 virtual ITopGroups&lt;TGroupValue&gt; GetTopGroups(int withinGroupOffset)</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">withinGroupOffset</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.Search.Grouping.ITopGroups-1.html">ITopGroups</a>&lt;TGroupValue&gt;</td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_RetrieveGroup_System_Int32_" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.RetrieveGroup(System.Int32)">RetrieveGroup(Int32)</h4>
<div class="markdown level1 summary"><p>Returns the group the specified doc belongs to or <code>null</code> if no group could be retrieved.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected abstract AbstractSecondPassGroupingCollector.SearchGroupDocs&lt;TGroupValue&gt; RetrieveGroup(int doc)</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">doc</span></td>
<td><p>The specified doc</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><a class="xref" href="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector.SearchGroupDocs-1.html">AbstractSecondPassGroupingCollector.SearchGroupDocs</a>&lt;TGroupValue&gt;</td>
<td><p>the group the specified doc belongs to or <code>null</code> if no group could be retrieved</p>
</td>
</tr>
</tbody>
</table>
<h5 class="exceptions">Exceptions</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Condition</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.IOException</span></td>
<td><p>If an I/O related error occurred</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Grouping_AbstractSecondPassGroupingCollector_1_SetNextReader_Lucene_Net_Index_AtomicReaderContext_" data-uid="Lucene.Net.Search.Grouping.AbstractSecondPassGroupingCollector`1.SetNextReader(Lucene.Net.Index.AtomicReaderContext)">SetNextReader(AtomicReaderContext)</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 virtual void SetNextReader(AtomicReaderContext context)</code></pre>
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<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.Index.AtomicReaderContext</span></td>
<td><span class="parametername">context</span></td>
<td></td>
</tr>
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<h5 class="decalaration">Declaration</h5>
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<pre><code class="lang-csharp hljs">public virtual void SetScorer(Scorer scorer)</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.Scorer</span></td>
<td><span class="parametername">scorer</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="implements">Implements</h3>
<div>
<a class="xref" href="Lucene.Net.Search.Grouping.IAbstractSecondPassGroupingCollector-1.html">IAbstractSecondPassGroupingCollector&lt;TGroupValue&gt;</a>
</div>
<div>
<span class="xref">Lucene.Net.Search.ICollector</span>
</div>
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