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| Apache Lucene.NET 4.8.0-beta00013 Documentation </title>
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<article class="content wrap" id="_content" data-uid="Lucene.Net.Codecs.PostingsWriterBase">
<h1 id="Lucene_Net_Codecs_PostingsWriterBase" data-uid="Lucene.Net.Codecs.PostingsWriterBase" class="text-break">Class PostingsWriterBase
</h1>
<div class="markdown level0 summary"><p>Extension of <a class="xref" href="Lucene.Net.Codecs.PostingsConsumer.html">PostingsConsumer</a> to support pluggable term dictionaries.
<p>
This class contains additional hooks to interact with the provided
term dictionaries such as <a class="xref" href="Lucene.Net.Codecs.BlockTreeTermsWriter.html">BlockTreeTermsWriter</a>. If you want
to re-use an existing implementation and are only interested in
customizing the format of the postings list, extend this class
instead.
<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"><a class="xref" href="Lucene.Net.Codecs.PostingsConsumer.html">PostingsConsumer</a></div>
<div class="level2"><span class="xref">PostingsWriterBase</span></div>
<div class="level3"><a class="xref" href="Lucene.Net.Codecs.Lucene41.Lucene41PostingsWriter.html">Lucene41PostingsWriter</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.Codecs.PostingsConsumer.html#Lucene_Net_Codecs_PostingsConsumer_StartDoc_System_Int32_System_Int32_">PostingsConsumer.StartDoc(Int32, Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Codecs.PostingsConsumer.html#Lucene_Net_Codecs_PostingsConsumer_AddPosition_System_Int32_Lucene_Net_Util_BytesRef_System_Int32_System_Int32_">PostingsConsumer.AddPosition(Int32, BytesRef, Int32, Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Codecs.PostingsConsumer.html#Lucene_Net_Codecs_PostingsConsumer_FinishDoc">PostingsConsumer.FinishDoc()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Codecs.PostingsConsumer.html#Lucene_Net_Codecs_PostingsConsumer_Merge_Lucene_Net_Index_MergeState_Lucene_Net_Index_IndexOptions_Lucene_Net_Index_DocsEnum_Lucene_Net_Util_FixedBitSet_">PostingsConsumer.Merge(MergeState, IndexOptions, DocsEnum, FixedBitSet)</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.Codecs.html">Lucene.Net.Codecs</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Codecs_PostingsWriterBase_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class PostingsWriterBase : PostingsConsumer, IDisposable</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Codecs_PostingsWriterBase__ctor_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.#ctor*"></a>
<h4 id="Lucene_Net_Codecs_PostingsWriterBase__ctor" data-uid="Lucene.Net.Codecs.PostingsWriterBase.#ctor">PostingsWriterBase()</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 PostingsWriterBase()</code></pre>
</div>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Codecs_PostingsWriterBase_Dispose_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.Dispose*"></a>
<h4 id="Lucene_Net_Codecs_PostingsWriterBase_Dispose" data-uid="Lucene.Net.Codecs.PostingsWriterBase.Dispose">Dispose()</h4>
<div class="markdown level1 summary"><p>Disposes all resources used by this object.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public void Dispose()</code></pre>
</div>
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<a id="Lucene_Net_Codecs_PostingsWriterBase_Dispose_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.Dispose*"></a>
<h4 id="Lucene_Net_Codecs_PostingsWriterBase_Dispose_System_Boolean_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.Dispose(System.Boolean)">Dispose(Boolean)</h4>
<div class="markdown level1 summary"><p>Implementations must override and should dispose all resources used by this instance.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected abstract void Dispose(bool disposing)</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">disposing</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Codecs_PostingsWriterBase_EncodeTerm_System_Int64___Lucene_Net_Store_DataOutput_Lucene_Net_Index_FieldInfo_Lucene_Net_Codecs_BlockTermState_System_Boolean_.md&amp;value=---%0Auid%3A%20Lucene.Net.Codecs.PostingsWriterBase.EncodeTerm(System.Int64%5B%5D%2CLucene.Net.Store.DataOutput%2CLucene.Net.Index.FieldInfo%2CLucene.Net.Codecs.BlockTermState%2CSystem.Boolean)%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_Codecs_PostingsWriterBase_EncodeTerm_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.EncodeTerm*"></a>
<h4 id="Lucene_Net_Codecs_PostingsWriterBase_EncodeTerm_System_Int64___Lucene_Net_Store_DataOutput_Lucene_Net_Index_FieldInfo_Lucene_Net_Codecs_BlockTermState_System_Boolean_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.EncodeTerm(System.Int64[],Lucene.Net.Store.DataOutput,Lucene.Net.Index.FieldInfo,Lucene.Net.Codecs.BlockTermState,System.Boolean)">EncodeTerm(Int64[], DataOutput, FieldInfo, BlockTermState, Boolean)</h4>
<div class="markdown level1 summary"><p>Encode metadata as <span class="xref">long[]</span> and <span class="xref">byte[]</span>. <code data-dev-comment-type="paramref" class="paramref">absolute</code> controls whether
current term is delta encoded according to latest term.
Usually elements in <code data-dev-comment-type="paramref" class="paramref">longs</code> are file pointers, so each one always
increases when a new term is consumed. <code data-dev-comment-type="paramref" class="paramref">out</code> is used to write generic
bytes, which are not monotonic.
<p>
NOTE: sometimes <span class="xref">long[]</span> might contain &quot;don&apos;t care&quot; values that are unused, e.g.
the pointer to postings list may not be defined for some terms but is defined
for others, if it is designed to inline some postings data in term dictionary.
In this case, the postings writer should always use the last value, so that each
element in metadata <span class="xref">long[]</span> remains monotonic.</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 EncodeTerm(long[] longs, DataOutput out, FieldInfo fieldInfo, BlockTermState state, bool absolute)</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.Int64</span>[]</td>
<td><span class="parametername">longs</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Store.DataOutput.html">DataOutput</a></td>
<td><span class="parametername">out</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Index.FieldInfo.html">FieldInfo</a></td>
<td><span class="parametername">fieldInfo</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Codecs.BlockTermState.html">BlockTermState</a></td>
<td><span class="parametername">state</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">absolute</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Codecs_PostingsWriterBase_FinishTerm_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.FinishTerm*"></a>
<h4 id="Lucene_Net_Codecs_PostingsWriterBase_FinishTerm_Lucene_Net_Codecs_BlockTermState_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.FinishTerm(Lucene.Net.Codecs.BlockTermState)">FinishTerm(BlockTermState)</h4>
<div class="markdown level1 summary"><p>Finishes the current term. The provided
<a class="xref" href="Lucene.Net.Codecs.BlockTermState.html">BlockTermState</a> contains the term&apos;s summary statistics,
and will holds metadata from PBF when returned.</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 FinishTerm(BlockTermState state)</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.Codecs.BlockTermState.html">BlockTermState</a></td>
<td><span class="parametername">state</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Codecs_PostingsWriterBase_Init_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.Init*"></a>
<h4 id="Lucene_Net_Codecs_PostingsWriterBase_Init_Lucene_Net_Store_IndexOutput_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.Init(Lucene.Net.Store.IndexOutput)">Init(IndexOutput)</h4>
<div class="markdown level1 summary"><p>Called once after startup, before any terms have been
added. Implementations typically write a header to
the provided <code data-dev-comment-type="paramref" class="paramref">termsOut</code>.</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 Init(IndexOutput termsOut)</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.Store.IndexOutput.html">IndexOutput</a></td>
<td><span class="parametername">termsOut</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Codecs_PostingsWriterBase_NewTermState_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.NewTermState*"></a>
<h4 id="Lucene_Net_Codecs_PostingsWriterBase_NewTermState" data-uid="Lucene.Net.Codecs.PostingsWriterBase.NewTermState">NewTermState()</h4>
<div class="markdown level1 summary"><p>Return a newly created empty <a class="xref" href="Lucene.Net.Index.TermState.html">TermState</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 BlockTermState NewTermState()</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><a class="xref" href="Lucene.Net.Codecs.BlockTermState.html">BlockTermState</a></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Codecs_PostingsWriterBase_SetField_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.SetField*"></a>
<h4 id="Lucene_Net_Codecs_PostingsWriterBase_SetField_Lucene_Net_Index_FieldInfo_" data-uid="Lucene.Net.Codecs.PostingsWriterBase.SetField(Lucene.Net.Index.FieldInfo)">SetField(FieldInfo)</h4>
<div class="markdown level1 summary"><p>Sets the current field for writing, and returns the
fixed length of <span class="xref">long[]</span> metadata (which is fixed per
field), called when the writing switches to another field.</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 SetField(FieldInfo fieldInfo)</code></pre>
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<h5 class="parameters">Parameters</h5>
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<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
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<tr>
<td><a class="xref" href="Lucene.Net.Index.FieldInfo.html">FieldInfo</a></td>
<td><span class="parametername">fieldInfo</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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<h4 id="Lucene_Net_Codecs_PostingsWriterBase_StartTerm" data-uid="Lucene.Net.Codecs.PostingsWriterBase.StartTerm">StartTerm()</h4>
<div class="markdown level1 summary"><p>Start a new term. Note that a matching call to
<a class="xref" href="Lucene.Net.Codecs.PostingsWriterBase.html#Lucene_Net_Codecs_PostingsWriterBase_FinishTerm_Lucene_Net_Codecs_BlockTermState_">FinishTerm(BlockTermState)</a> is done, only if the term has at least one
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<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract void StartTerm()</code></pre>
</div>
<h3 id="implements">Implements</h3>
<div>
<span class="xref">System.IDisposable</span>
</div>
<h3 id="seealso">See Also</h3>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Codecs.PostingsReaderBase.html">PostingsReaderBase</a></div>
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