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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.Index.IndexCommit">
<h1 id="Lucene_Net_Index_IndexCommit" data-uid="Lucene.Net.Index.IndexCommit" class="text-break">Class IndexCommit
</h1>
<div class="markdown level0 summary"><p>Expert: represents a single commit into an index as seen by the
<a class="xref" href="Lucene.Net.Index.IndexDeletionPolicy.html">IndexDeletionPolicy</a> or <a class="xref" href="Lucene.Net.Index.IndexReader.html">IndexReader</a>.</p>
<p> Changes to the content of an index are made visible
only after the writer who made that change commits by
writing a new segments file
(<code>segments_N</code>). This point in time, when the
action of writing of a new segments file to the directory
is completed, is an index commit.</p>
<p>Each index commit point has a unique segments file
associated with it. The segments file associated with a
later index commit point would have a larger N.</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">IndexCommit</span></div>
</div>
<div classs="implements">
<h5>Implements</h5>
<div><span class="xref">System.IComparable</span>&lt;<a class="xref" href="Lucene.Net.Index.IndexCommit.html">IndexCommit</a>&gt;</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>
<span class="xref">System.Object.ToString()</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Index.html">Lucene.Net.Index</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Index_IndexCommit_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class IndexCommit : IComparable&lt;IndexCommit&gt;</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Index_IndexCommit__ctor.md&amp;value=---%0Auid%3A%20Lucene.Net.Index.IndexCommit.%23ctor%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_Index_IndexCommit__ctor_" data-uid="Lucene.Net.Index.IndexCommit.#ctor*"></a>
<h4 id="Lucene_Net_Index_IndexCommit__ctor" data-uid="Lucene.Net.Index.IndexCommit.#ctor">IndexCommit()</h4>
<div class="markdown level1 summary"><p>Sole constructor. (For invocation by subclass
constructors, typically implicit.)</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected IndexCommit()</code></pre>
</div>
<h3 id="properties">Properties
</h3>
<span class="small pull-right mobile-hide">
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</span>
<a id="Lucene_Net_Index_IndexCommit_Directory_" data-uid="Lucene.Net.Index.IndexCommit.Directory*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_Directory" data-uid="Lucene.Net.Index.IndexCommit.Directory">Directory</h4>
<div class="markdown level1 summary"><p>Returns the <a class="xref" href="Lucene.Net.Store.Directory.html">Directory</a> for the index.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract Directory Directory { 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><a class="xref" href="Lucene.Net.Store.Directory.html">Directory</a></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Index_IndexCommit_FileNames.md&amp;value=---%0Auid%3A%20Lucene.Net.Index.IndexCommit.FileNames%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_Index_IndexCommit_FileNames_" data-uid="Lucene.Net.Index.IndexCommit.FileNames*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_FileNames" data-uid="Lucene.Net.Index.IndexCommit.FileNames">FileNames</h4>
<div class="markdown level1 summary"><p>Returns all index files referenced by this commit point.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract ICollection&lt;string&gt; FileNames { 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.Collections.Generic.ICollection</span>&lt;<span class="xref">System.String</span>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Index_IndexCommit_Generation_" data-uid="Lucene.Net.Index.IndexCommit.Generation*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_Generation" data-uid="Lucene.Net.Index.IndexCommit.Generation">Generation</h4>
<div class="markdown level1 summary"><p>Returns the generation (the _N in segments_N) for this
<a class="xref" href="Lucene.Net.Index.IndexCommit.html">IndexCommit</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 long Generation { 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>
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<a id="Lucene_Net_Index_IndexCommit_IsDeleted_" data-uid="Lucene.Net.Index.IndexCommit.IsDeleted*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_IsDeleted" data-uid="Lucene.Net.Index.IndexCommit.IsDeleted">IsDeleted</h4>
<div class="markdown level1 summary"><p>Returns <code>true</code> if this commit should be deleted; this is
only used by <a class="xref" href="Lucene.Net.Index.IndexWriter.html">IndexWriter</a> after invoking the
<a class="xref" href="Lucene.Net.Index.IndexDeletionPolicy.html">IndexDeletionPolicy</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 bool IsDeleted { 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>
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<a id="Lucene_Net_Index_IndexCommit_SegmentCount_" data-uid="Lucene.Net.Index.IndexCommit.SegmentCount*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_SegmentCount" data-uid="Lucene.Net.Index.IndexCommit.SegmentCount">SegmentCount</h4>
<div class="markdown level1 summary"><p>Returns number of segments referenced by this commit. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract int SegmentCount { 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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Index_IndexCommit_SegmentsFileName_" data-uid="Lucene.Net.Index.IndexCommit.SegmentsFileName*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_SegmentsFileName" data-uid="Lucene.Net.Index.IndexCommit.SegmentsFileName">SegmentsFileName</h4>
<div class="markdown level1 summary"><p>Get the segments file (<code>segments_N</code>) associated
with this commit point.</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 SegmentsFileName { 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>
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<a id="Lucene_Net_Index_IndexCommit_UserData_" data-uid="Lucene.Net.Index.IndexCommit.UserData*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_UserData" data-uid="Lucene.Net.Index.IndexCommit.UserData">UserData</h4>
<div class="markdown level1 summary"><p>Returns userData, previously passed to
<a class="xref" href="Lucene.Net.Index.IndexWriter.html#Lucene_Net_Index_IndexWriter_SetCommitData_System_Collections_Generic_IDictionary_System_String_System_String__">SetCommitData(IDictionary&lt;String, String&gt;)</a>} for this commit.<br>The dictionary is <span class="xref">System.String</span> -&gt; <span class="xref">System.String</span>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract IDictionary&lt;string, string&gt; UserData { 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.Collections.Generic.IDictionary</span>&lt;<span class="xref">System.String</span>, <span class="xref">System.String</span>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Index_IndexCommit_CompareTo_" data-uid="Lucene.Net.Index.IndexCommit.CompareTo*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_CompareTo_Lucene_Net_Index_IndexCommit_" data-uid="Lucene.Net.Index.IndexCommit.CompareTo(Lucene.Net.Index.IndexCommit)">CompareTo(IndexCommit)</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 int CompareTo(IndexCommit commit)</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.Index.IndexCommit.html">IndexCommit</a></td>
<td><span class="parametername">commit</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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Index/IndexCommit.cs/#L73">View Source</a>
</span>
<a id="Lucene_Net_Index_IndexCommit_Delete_" data-uid="Lucene.Net.Index.IndexCommit.Delete*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_Delete" data-uid="Lucene.Net.Index.IndexCommit.Delete">Delete()</h4>
<div class="markdown level1 summary"><p>Delete this commit point. This only applies when using
the commit point in the context of <a class="xref" href="Lucene.Net.Index.IndexWriter.html">IndexWriter</a>&apos;s
<a class="xref" href="Lucene.Net.Index.IndexDeletionPolicy.html">IndexDeletionPolicy</a>.
<p>
Upon calling this, the writer is notified that this commit
point should be deleted.
<p>
Decision that a commit-point should be deleted is taken by the <a class="xref" href="Lucene.Net.Index.IndexDeletionPolicy.html">IndexDeletionPolicy</a> in effect
and therefore this should only be called by its <a class="xref" href="Lucene.Net.Index.IndexDeletionPolicy.html#Lucene_Net_Index_IndexDeletionPolicy_OnInit__1_System_Collections_Generic_IList___0__">OnInit&lt;T&gt;(IList&lt;T&gt;)</a> or
<a class="xref" href="Lucene.Net.Index.IndexDeletionPolicy.html#Lucene_Net_Index_IndexDeletionPolicy_OnCommit__1_System_Collections_Generic_IList___0__">OnCommit&lt;T&gt;(IList&lt;T&gt;)</a> methods.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract void Delete()</code></pre>
</div>
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</span>
<a id="Lucene_Net_Index_IndexCommit_Equals_" data-uid="Lucene.Net.Index.IndexCommit.Equals*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_Equals_System_Object_" data-uid="Lucene.Net.Index.IndexCommit.Equals(System.Object)">Equals(Object)</h4>
<div class="markdown level1 summary"><p>Two IndexCommits are equal if both their <a class="xref" href="Lucene.Net.Store.Directory.html">Directory</a> and versions are equal. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override bool Equals(object other)</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">other</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>
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<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Index_IndexCommit_GetHashCode.md&amp;value=---%0Auid%3A%20Lucene.Net.Index.IndexCommit.GetHashCode%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_Index_IndexCommit_GetHashCode_" data-uid="Lucene.Net.Index.IndexCommit.GetHashCode*"></a>
<h4 id="Lucene_Net_Index_IndexCommit_GetHashCode" data-uid="Lucene.Net.Index.IndexCommit.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 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>
<h3 id="implements">Implements</h3>
<div>
<span class="xref">System.IComparable&lt;T&gt;</span>
</div>
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