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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery">
<h1 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery" class="text-break">Class FieldMaskingSpanQuery
</h1>
<div class="markdown level0 summary"><p>Wrapper to allow <a class="xref" href="Lucene.Net.Search.Spans.SpanQuery.html">SpanQuery</a> objects participate in composite
single-field SpanQueries by &apos;lying&apos; about their search field. That is,
the masked <a class="xref" href="Lucene.Net.Search.Spans.SpanQuery.html">SpanQuery</a> will function as normal,
but <a class="xref" href="Lucene.Net.Search.Spans.SpanQuery.html#Lucene_Net_Search_Spans_SpanQuery_Field">Field</a> simply hands back the value supplied
in this class&apos;s constructor.</p>
<p>This can be used to support Queries like <a class="xref" href="Lucene.Net.Search.Spans.SpanNearQuery.html">SpanNearQuery</a> or
<a class="xref" href="Lucene.Net.Search.Spans.SpanOrQuery.html">SpanOrQuery</a> across different fields, which is not ordinarily
permitted.</p>
<p>This can be useful for denormalized relational data: for example, when
indexing a document with conceptually many &apos;children&apos;: </p>
<pre><code> teacherid: 1
studentfirstname: james
studentsurname: jones
teacherid: 2
studenfirstname: james
studentsurname: smith
studentfirstname: sally
studentsurname: jones</code></pre>
<p>A <a class="xref" href="Lucene.Net.Search.Spans.SpanNearQuery.html">SpanNearQuery</a> with a slop of 0 can be applied across two
<a class="xref" href="Lucene.Net.Search.Spans.SpanTermQuery.html">SpanTermQuery</a> objects as follows:
<pre><code> SpanQuery q1 = new SpanTermQuery(new Term(&quot;studentfirstname&quot;, &quot;james&quot;));
SpanQuery q2 = new SpanTermQuery(new Term(&quot;studentsurname&quot;, &quot;jones&quot;));
SpanQuery q2m = new FieldMaskingSpanQuery(q2, &quot;studentfirstname&quot;);
Query q = new SpanNearQuery(new SpanQuery[] { q1, q2m }, -1, false);</code></pre>
to search for &apos;studentfirstname:james studentsurname:jones&apos; and find
teacherid 1 without matching teacherid 2 (which has a &apos;james&apos; in position 0
and &apos;jones&apos; in position 1). </p>
<p>Note: as <a class="xref" href="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.html#Lucene_Net_Search_Spans_FieldMaskingSpanQuery_Field">Field</a> returns the masked field, scoring will be
done using the <a class="xref" href="Lucene.Net.Search.Similarities.Similarity.html">Similarity</a> and collection statistics of the field name supplied,
but with the term statistics of the real field. This may lead to exceptions,
poor performance, and unexpected scoring behavior.</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.Query.html">Query</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Spans.SpanQuery.html">SpanQuery</a></div>
<div class="level3"><span class="xref">FieldMaskingSpanQuery</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_Boost">Query.Boost</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_ToString">Query.ToString()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_Clone">Query.Clone()</a>
</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.Search.Spans.html">Lucene.Net.Search.Spans</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class FieldMaskingSpanQuery : SpanQuery</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery__ctor_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.#ctor*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery__ctor_Lucene_Net_Search_Spans_SpanQuery_System_String_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.#ctor(Lucene.Net.Search.Spans.SpanQuery,System.String)">FieldMaskingSpanQuery(SpanQuery, String)</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 FieldMaskingSpanQuery(SpanQuery maskedQuery, string maskedField)</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.Spans.SpanQuery.html">SpanQuery</a></td>
<td><span class="parametername">maskedQuery</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">maskedField</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
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</span>
<a id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_Field_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.Field*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_Field" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.Field">Field</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 string Field { 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>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Spans.SpanQuery.html#Lucene_Net_Search_Spans_SpanQuery_Field">SpanQuery.Field</a></div>
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</span>
<a id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_MaskedQuery_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.MaskedQuery*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_MaskedQuery" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.MaskedQuery">MaskedQuery</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 SpanQuery MaskedQuery { 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.Search.Spans.SpanQuery.html">SpanQuery</a></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_CreateWeight_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.CreateWeight*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_CreateWeight_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.CreateWeight(Lucene.Net.Search.IndexSearcher)">CreateWeight(IndexSearcher)</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 Weight CreateWeight(IndexSearcher searcher)</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.IndexSearcher.html">IndexSearcher</a></td>
<td><span class="parametername">searcher</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.Weight.html">Weight</a></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Spans.SpanQuery.html#Lucene_Net_Search_Spans_SpanQuery_CreateWeight_Lucene_Net_Search_IndexSearcher_">SpanQuery.CreateWeight(IndexSearcher)</a></div>
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<a id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_Equals_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.Equals*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_Equals_System_Object_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.Equals(System.Object)">Equals(Object)</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 Equals(object o)</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">o</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.Query.html#Lucene_Net_Search_Query_Equals_System_Object_">Query.Equals(Object)</a></div>
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<a id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_ExtractTerms_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.ExtractTerms*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_ExtractTerms_System_Collections_Generic_ISet_Lucene_Net_Index_Term__" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.ExtractTerms(System.Collections.Generic.ISet{Lucene.Net.Index.Term})">ExtractTerms(ISet&lt;Term&gt;)</h4>
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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 override void ExtractTerms(ISet&lt;Term&gt; terms)</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.ISet</span>&lt;<a class="xref" href="Lucene.Net.Index.Term.html">Term</a>&gt;</td>
<td><span class="parametername">terms</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_ExtractTerms_System_Collections_Generic_ISet_Lucene_Net_Index_Term__">Query.ExtractTerms(ISet&lt;Term&gt;)</a></div>
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<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_GetHashCode" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.GetHashCode">GetHashCode()</h4>
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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 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><a class="xref" href="Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_GetHashCode">Query.GetHashCode()</a></div>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Spans_FieldMaskingSpanQuery_GetSpans_Lucene_Net_Index_AtomicReaderContext_Lucene_Net_Util_IBits_System_Collections_Generic_IDictionary_Lucene_Net_Index_Term_Lucene_Net_Index_TermContext__.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Spans.FieldMaskingSpanQuery.GetSpans(Lucene.Net.Index.AtomicReaderContext%2CLucene.Net.Util.IBits%2CSystem.Collections.Generic.IDictionary%7BLucene.Net.Index.Term%2CLucene.Net.Index.TermContext%7D)%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_Search_Spans_FieldMaskingSpanQuery_GetSpans_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.GetSpans*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_GetSpans_Lucene_Net_Index_AtomicReaderContext_Lucene_Net_Util_IBits_System_Collections_Generic_IDictionary_Lucene_Net_Index_Term_Lucene_Net_Index_TermContext__" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.GetSpans(Lucene.Net.Index.AtomicReaderContext,Lucene.Net.Util.IBits,System.Collections.Generic.IDictionary{Lucene.Net.Index.Term,Lucene.Net.Index.TermContext})">GetSpans(AtomicReaderContext, IBits, IDictionary&lt;Term, TermContext&gt;)</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 Spans GetSpans(AtomicReaderContext context, IBits acceptDocs, IDictionary&lt;Term, TermContext&gt; termContexts)</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.AtomicReaderContext.html">AtomicReaderContext</a></td>
<td><span class="parametername">context</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Util.IBits.html">IBits</a></td>
<td><span class="parametername">acceptDocs</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Collections.Generic.IDictionary</span>&lt;<a class="xref" href="Lucene.Net.Index.Term.html">Term</a>, <a class="xref" href="Lucene.Net.Index.TermContext.html">TermContext</a>&gt;</td>
<td><span class="parametername">termContexts</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.Spans.Spans.html">Spans</a></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Spans.SpanQuery.html#Lucene_Net_Search_Spans_SpanQuery_GetSpans_Lucene_Net_Index_AtomicReaderContext_Lucene_Net_Util_IBits_System_Collections_Generic_IDictionary_Lucene_Net_Index_Term_Lucene_Net_Index_TermContext__">SpanQuery.GetSpans(AtomicReaderContext, IBits, IDictionary&lt;Term, TermContext&gt;)</a></div>
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</span>
<a id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_Rewrite_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.Rewrite*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_Rewrite_Lucene_Net_Index_IndexReader_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.Rewrite(Lucene.Net.Index.IndexReader)">Rewrite(IndexReader)</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 Query Rewrite(IndexReader reader)</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.IndexReader.html">IndexReader</a></td>
<td><span class="parametername">reader</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.Query.html">Query</a></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_Rewrite_Lucene_Net_Index_IndexReader_">Query.Rewrite(IndexReader)</a></div>
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<a id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_ToString_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.ToString*"></a>
<h4 id="Lucene_Net_Search_Spans_FieldMaskingSpanQuery_ToString_System_String_" data-uid="Lucene.Net.Search.Spans.FieldMaskingSpanQuery.ToString(System.String)">ToString(String)</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 string ToString(string field)</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">field</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.String</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Query.html#Lucene_Net_Search_Query_ToString_System_String_">Query.ToString(String)</a></div>
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