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<article class="content wrap" id="_content" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1">
<h1 id="Lucene_Net_Analysis_LookaheadTokenFilter_1" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1" class="text-break">Class LookaheadTokenFilter&lt;T&gt;
</h1>
<div class="markdown level0 summary"><p>An abstract <span class="xref">Lucene.Net.Analysis.TokenFilter</span> to make it easier to build graph
token filters requiring some lookahead. This class handles
the details of buffering up tokens, recording them by
position, restoring them, providing access to them, etc.</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">Lucene.Net.Util.AttributeSource</span></div>
<div class="level2"><span class="xref">Lucene.Net.Analysis.TokenStream</span></div>
<div class="level3"><span class="xref">Lucene.Net.Analysis.TokenFilter</span></div>
<div class="level4"><a class="xref" href="Lucene.Net.Analysis.LookaheadTokenFilter.html">LookaheadTokenFilter</a></div>
<div class="level5"><span class="xref">LookaheadTokenFilter&lt;T&gt;</span></div>
<div class="level6"><a class="xref" href="Lucene.Net.Analysis.MockGraphTokenFilter.html">MockGraphTokenFilter</a></div>
<div class="level6"><a class="xref" href="Lucene.Net.Analysis.MockRandomLookaheadTokenFilter.html">MockRandomLookaheadTokenFilter</a></div>
</div>
<div classs="implements">
<h5>Implements</h5>
<div><span class="xref">System.IDisposable</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="Lucene.Net.Analysis.LookaheadTokenFilter.html#Lucene_Net_Analysis_LookaheadTokenFilter_IncrementToken">LookaheadTokenFilter.IncrementToken()</a>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.TokenFilter.m_input</span>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.TokenFilter.End()</span>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.TokenFilter.Dispose(System.Boolean)</span>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.TokenStream.Dispose()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttributeFactory()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttributeClassesEnumerator()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttributeImplsEnumerator()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.AddAttributeImpl(Lucene.Net.Util.Attribute)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.AddAttribute&lt;T&gt;()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.HasAttributes</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.HasAttribute&lt;T&gt;()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttribute&lt;T&gt;()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.ClearAttributes()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.CaptureState()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.RestoreState(Lucene.Net.Util.AttributeSource.State)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetHashCode()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.Equals(System.Object)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.ReflectAsString(System.Boolean)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.ReflectWith(Lucene.Net.Util.IAttributeReflector)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.CloneAttributes()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.CopyTo(Lucene.Net.Util.AttributeSource)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.ToString()</span>
</div>
<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.Analysis.html">Lucene.Net.Analysis</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.TestFramework.dll</h6>
<h5 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class LookaheadTokenFilter&lt;T&gt; : LookaheadTokenFilter, IDisposable where T : LookaheadTokenFilter.Position</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">T</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Analysis_LookaheadTokenFilter_1__ctor_" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1__ctor_Lucene_Net_Analysis_TokenStream_" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.#ctor(Lucene.Net.Analysis.TokenStream)">LookaheadTokenFilter(TokenStream)</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 LookaheadTokenFilter(TokenStream 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.Analysis.TokenStream</span></td>
<td><span class="parametername">input</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="fields">Fields
</h3>
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<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_DEBUG" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.DEBUG">DEBUG</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 static readonly bool DEBUG</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
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<th>Type</th>
<th>Description</th>
</tr>
</thead>
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<td><span class="xref">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
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<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_m_end" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.m_end">m_end</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 bool m_end</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.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_m_inputPos" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.m_inputPos">m_inputPos</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 int m_inputPos</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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_m_offsetAtt" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.m_offsetAtt">m_offsetAtt</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 IOffsetAttribute m_offsetAtt</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">Lucene.Net.Analysis.TokenAttributes.IOffsetAttribute</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_m_outputPos" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.m_outputPos">m_outputPos</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 int m_outputPos</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.Int32</span></td>
<td></td>
</tr>
</tbody>
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<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_m_posIncAtt" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.m_posIncAtt">m_posIncAtt</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 IPositionIncrementAttribute m_posIncAtt</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">Lucene.Net.Analysis.TokenAttributes.IPositionIncrementAttribute</span></td>
<td></td>
</tr>
</tbody>
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<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_m_positions" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.m_positions">m_positions</h4>
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<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected readonly RollingBuffer&lt;T&gt; m_positions</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">Lucene.Net.Util.RollingBuffer</span>&lt;T&gt;</td>
<td></td>
</tr>
</tbody>
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<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_m_posLenAtt" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.m_posLenAtt">m_posLenAtt</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 IPositionLengthAttribute m_posLenAtt</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">Lucene.Net.Analysis.TokenAttributes.IPositionLengthAttribute</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Analysis_LookaheadTokenFilter_1_AfterPosition_" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.AfterPosition*"></a>
<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_AfterPosition" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.AfterPosition">AfterPosition()</h4>
<div class="markdown level1 summary"><p>This is called when all input tokens leaving a given
position have been returned. Override this and
call insertToken and then set whichever token&apos;s
attributes you want, if you want to inject
a token starting from this position.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected virtual void AfterPosition()</code></pre>
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<a id="Lucene_Net_Analysis_LookaheadTokenFilter_1_InsertToken_" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.InsertToken*"></a>
<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_InsertToken" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.InsertToken">InsertToken()</h4>
<div class="markdown level1 summary"><p>Call this only from within <a class="xref" href="Lucene.Net.Analysis.LookaheadTokenFilter-1.html#Lucene_Net_Analysis_LookaheadTokenFilter_1_AfterPosition">AfterPosition()</a>, to insert a new
token. After calling this you should set any
necessary token you need.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected virtual void InsertToken()</code></pre>
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<a id="Lucene_Net_Analysis_LookaheadTokenFilter_1_NewPosition_" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.NewPosition*"></a>
<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_NewPosition" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.NewPosition">NewPosition()</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 abstract T NewPosition()</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">T</span></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_Analysis_LookaheadTokenFilter_1_NextToken.md&amp;value=---%0Auid%3A%20Lucene.Net.Analysis.LookaheadTokenFilter%601.NextToken%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 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_NextToken_" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.NextToken*"></a>
<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_NextToken" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.NextToken">NextToken()</h4>
<div class="markdown level1 summary"><p>Call this when you are done looking ahead; it will set
the next token to return. Return the boolean back to
the caller.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected virtual bool NextToken()</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.Boolean</span></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_Analysis_LookaheadTokenFilter_1_PeekToken.md&amp;value=---%0Auid%3A%20Lucene.Net.Analysis.LookaheadTokenFilter%601.PeekToken%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 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_PeekToken_" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.PeekToken*"></a>
<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_PeekToken" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.PeekToken">PeekToken()</h4>
<div class="markdown level1 summary"><p>Returns true if there is a new token. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected virtual bool PeekToken()</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.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Analysis_LookaheadTokenFilter_1_Reset_" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.Reset*"></a>
<h4 id="Lucene_Net_Analysis_LookaheadTokenFilter_1_Reset" data-uid="Lucene.Net.Analysis.LookaheadTokenFilter`1.Reset">Reset()</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 Reset()</code></pre>
</div>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Analysis.TokenFilter.Reset()</span></div>
<h3 id="implements">Implements</h3>
<div>
<span class="xref">System.IDisposable</span>
</div>
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