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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup">
<h1 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup" class="text-break">Class FSTCompletionLookup
</h1>
<div class="markdown level0 summary"><p>An adapter from <a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html">Lookup</a> API to <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a>.</p>
<p>This adapter differs from <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a> in that it attempts
to discretize any &quot;weights&quot; as passed from in <a class="xref" href="Lucene.Net.Search.Suggest.IInputIterator.html#Lucene_Net_Search_Suggest_IInputIterator_Weight">Weight</a>
to match the number of buckets. For the rationale for bucketing, see
<a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a>.
</p>
<p><strong>Note:</strong>Discretization requires an additional sorting pass.
</p>
<p>The range of weights for bucketing/ discretization is determined
by sorting the input by weight and then dividing into
equal ranges. Then, scores within each range are assigned to that bucket.
</p>
<p>Note that this means that even large differences in weights may be lost
during automaton construction, but the overall distinction between &quot;classes&quot;
of weights will be preserved regardless of the distribution of weights.
</p>
<p>For fine-grained control over which weights are assigned to which buckets,
use <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a> directly or <a class="xref" href="Lucene.Net.Search.Suggest.Tst.TSTLookup.html">TSTLookup</a>, for example.
</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"><a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html">Lookup</a></div>
<div class="level2"><span class="xref">FSTCompletionLookup</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_CHARSEQUENCE_COMPARER">Lookup.CHARSEQUENCE_COMPARER</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Build_Lucene_Net_Search_Spell_IDictionary_">Lookup.Build(IDictionary)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Load_System_IO_Stream_">Lookup.Load(Stream)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Store_System_IO_Stream_">Lookup.Store(Stream)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_DoLookup_System_String_System_Boolean_System_Int32_">Lookup.DoLookup(String, Boolean, Int32)</a>
</div>
<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.Suggest.Fst.html">Lucene.Net.Search.Suggest.Fst</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Suggest.dll</h6>
<h5 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class FSTCompletionLookup : Lookup</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup__ctor_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.#ctor*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup__ctor" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.#ctor">FSTCompletionLookup()</h4>
<div class="markdown level1 summary"><p>This constructor prepares for creating a suggested FST using the
<a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.html#Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Build_Lucene_Net_Search_Suggest_IInputIterator_">Build(IInputIterator)</a> method. The number of weight
discretization buckets is set to <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html#Lucene_Net_Search_Suggest_Fst_FSTCompletion_DEFAULT_BUCKETS">DEFAULT_BUCKETS</a> and
exact matches are promoted to the top of the suggestions list.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public FSTCompletionLookup()</code></pre>
</div>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup__ctor_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.#ctor*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup__ctor_Lucene_Net_Search_Suggest_Fst_FSTCompletion_System_Boolean_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.#ctor(Lucene.Net.Search.Suggest.Fst.FSTCompletion,System.Boolean)">FSTCompletionLookup(FSTCompletion, Boolean)</h4>
<div class="markdown level1 summary"><p>This constructor takes a pre-built automaton.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public FSTCompletionLookup(FSTCompletion completion, bool exactMatchFirst)</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.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a></td>
<td><span class="parametername">completion</span></td>
<td><p>An instance of <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a>. </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">exactMatchFirst</span></td>
<td><p>If <pre><code>true</code></pre> exact matches are promoted to the top of the
suggestions list. Otherwise they appear in the order of
discretized weight and alphabetical within the bucket. </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup__ctor_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.#ctor*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup__ctor_System_Int32_System_Boolean_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.#ctor(System.Int32,System.Boolean)">FSTCompletionLookup(Int32, Boolean)</h4>
<div class="markdown level1 summary"><p>This constructor prepares for creating a suggested FST using the
<a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.html#Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Build_Lucene_Net_Search_Suggest_IInputIterator_">Build(IInputIterator)</a> method.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public FSTCompletionLookup(int buckets, bool exactMatchFirst)</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">buckets</span></td>
<td><p>The number of weight discretization buckets (see
<a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a> for details).</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">exactMatchFirst</span></td>
<td><p>If <code>true</code> exact matches are promoted to the top of the
suggestions list. Otherwise they appear in the order of
discretized weight and alphabetical within the bucket. </p>
</td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Count_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Count*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Count" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Count">Count</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 long Count { 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.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Count">Lookup.Count</a></div>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Build_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Build*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Build_Lucene_Net_Search_Suggest_IInputIterator_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Build(Lucene.Net.Search.Suggest.IInputIterator)">Build(IInputIterator)</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 void Build(IInputIterator iterator)</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.Search.Suggest.IInputIterator.html">IInputIterator</a></td>
<td><span class="parametername">iterator</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Build_Lucene_Net_Search_Suggest_IInputIterator_">Lookup.Build(IInputIterator)</a></div>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_DoLookup_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.DoLookup*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_DoLookup_System_String_System_Collections_Generic_IEnumerable_Lucene_Net_Util_BytesRef__System_Boolean_System_Int32_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.DoLookup(System.String,System.Collections.Generic.IEnumerable{Lucene.Net.Util.BytesRef},System.Boolean,System.Int32)">DoLookup(String, IEnumerable&lt;BytesRef&gt;, Boolean, 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 override IList&lt;Lookup.LookupResult&gt; DoLookup(string key, IEnumerable&lt;BytesRef&gt; contexts, bool higherWeightsFirst, int num)</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">key</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Collections.Generic.IEnumerable</span>&lt;<span class="xref">Lucene.Net.Util.BytesRef</span>&gt;</td>
<td><span class="parametername">contexts</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">higherWeightsFirst</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">num</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.Generic.IList</span>&lt;<a class="xref" href="Lucene.Net.Search.Suggest.Lookup.LookupResult.html">Lookup.LookupResult</a>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_DoLookup_System_String_System_Collections_Generic_IEnumerable_Lucene_Net_Util_BytesRef__System_Boolean_System_Int32_">Lookup.DoLookup(String, IEnumerable&lt;BytesRef&gt;, Boolean, Int32)</a></div>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Get_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Get*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Get_System_String_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Get(System.String)">Get(String)</h4>
<div class="markdown level1 summary"><p>Returns the bucket (weight) as a Long for the provided key if it exists,
otherwise null if it does not.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual object Get(string key)</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">key</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.Object</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_GetSizeInBytes_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.GetSizeInBytes*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_GetSizeInBytes" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.GetSizeInBytes">GetSizeInBytes()</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 long GetSizeInBytes()</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.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_GetSizeInBytes">Lookup.GetSizeInBytes()</a></div>
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<a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Load_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Load*"></a>
<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Load_Lucene_Net_Store_DataInput_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Load(Lucene.Net.Store.DataInput)">Load(DataInput)</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 bool Load(DataInput input)</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.Store.DataInput</span></td>
<td><span class="parametername">input</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><a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Load_Lucene_Net_Store_DataInput_">Lookup.Load(DataInput)</a></div>
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<h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionLookup_Store_Lucene_Net_Store_DataOutput_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionLookup.Store(Lucene.Net.Store.DataOutput)">Store(DataOutput)</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 bool Store(DataOutput output)</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.Store.DataOutput</span></td>
<td><span class="parametername">output</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><a class="xref" href="Lucene.Net.Search.Suggest.Lookup.html#Lucene_Net_Search_Suggest_Lookup_Store_Lucene_Net_Store_DataOutput_">Lookup.Store(DataOutput)</a></div>
<h3 id="seealso">See Also</h3>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a></div>
</div>
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