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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.Spans.Spans">
<h1 id="Lucene_Net_Search_Spans_Spans" data-uid="Lucene.Net.Search.Spans.Spans" class="text-break">Class Spans
</h1>
<div class="markdown level0 summary"><p>Expert: an enumeration of span matches. Used to implement span searching.
Each span represents a range of term positions within a document. Matches
are enumerated in order, by increasing document number, within that by
increasing start position and finally by increasing end position.</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">Spans</span></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Spans.NearSpansOrdered.html">NearSpansOrdered</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Spans.NearSpansUnordered.html">NearSpansUnordered</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Spans.SpanPositionCheckQuery.PositionCheckSpan.html">SpanPositionCheckQuery.PositionCheckSpan</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Search.Spans.TermSpans.html">TermSpans</a></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<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.Spans.html">Lucene.Net.Search.Spans</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Search_Spans_Spans_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public abstract class Spans</code></pre>
</div>
<h3 id="properties">Properties
</h3>
<span class="small pull-right mobile-hide">
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Spans_Spans_Doc.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Spans.Spans.Doc%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_Search_Spans_Spans_Doc_" data-uid="Lucene.Net.Search.Spans.Spans.Doc*"></a>
<h4 id="Lucene_Net_Search_Spans_Spans_Doc" data-uid="Lucene.Net.Search.Spans.Spans.Doc">Doc</h4>
<div class="markdown level1 summary"><p>Returns the document number of the current match. Initially invalid. </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 Doc { 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_Search_Spans_Spans_End_" data-uid="Lucene.Net.Search.Spans.Spans.End*"></a>
<h4 id="Lucene_Net_Search_Spans_Spans_End" data-uid="Lucene.Net.Search.Spans.Spans.End">End</h4>
<div class="markdown level1 summary"><p>Returns the end position of the current match. Initially invalid. </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 End { 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 href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Spans_Spans_IsPayloadAvailable.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Spans.Spans.IsPayloadAvailable%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_Search_Spans_Spans_IsPayloadAvailable_" data-uid="Lucene.Net.Search.Spans.Spans.IsPayloadAvailable*"></a>
<h4 id="Lucene_Net_Search_Spans_Spans_IsPayloadAvailable" data-uid="Lucene.Net.Search.Spans.Spans.IsPayloadAvailable">IsPayloadAvailable</h4>
<div class="markdown level1 summary"><p>Checks if a payload can be loaded at this position.
<p>
Payloads can only be loaded once per call to
<a class="xref" href="Lucene.Net.Search.Spans.Spans.html#Lucene_Net_Search_Spans_Spans_MoveNext">MoveNext()</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 IsPayloadAvailable { 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><p><code>true</code> if there is a payload available at this position that can be loaded </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Spans_Spans_Start_" data-uid="Lucene.Net.Search.Spans.Spans.Start*"></a>
<h4 id="Lucene_Net_Search_Spans_Spans_Start" data-uid="Lucene.Net.Search.Spans.Spans.Start">Start</h4>
<div class="markdown level1 summary"><p>Returns the start position of the current match. Initially invalid. </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 Start { 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>
<h3 id="methods">Methods
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Spans_Spans_GetCost.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Spans.Spans.GetCost%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_Spans_GetCost_" data-uid="Lucene.Net.Search.Spans.Spans.GetCost*"></a>
<h4 id="Lucene_Net_Search_Spans_Spans_GetCost" data-uid="Lucene.Net.Search.Spans.Spans.GetCost">GetCost()</h4>
<div class="markdown level1 summary"><p>Returns the estimated cost of this spans.
<p>
This is generally an upper bound of the number of documents this iterator
might match, but may be a rough heuristic, hardcoded value, or otherwise
completely inaccurate.</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 GetCost()</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>
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<a id="Lucene_Net_Search_Spans_Spans_GetPayload_" data-uid="Lucene.Net.Search.Spans.Spans.GetPayload*"></a>
<h4 id="Lucene_Net_Search_Spans_Spans_GetPayload" data-uid="Lucene.Net.Search.Spans.Spans.GetPayload">GetPayload()</h4>
<div class="markdown level1 summary"><p>Returns the payload data for the current span.
this is invalid until <a class="xref" href="Lucene.Net.Search.Spans.Spans.html#Lucene_Net_Search_Spans_Spans_MoveNext">MoveNext()</a> is called for
the first time.
This method must not be called more than once after each call
of <a class="xref" href="Lucene.Net.Search.Spans.Spans.html#Lucene_Net_Search_Spans_Spans_MoveNext">MoveNext()</a>. However, most payloads are loaded lazily,
so if the payload data for the current position is not needed,
this method may not be called at all for performance reasons. An ordered
SpanQuery does not lazy load, so if you have payloads in your index and
you do not want ordered SpanNearQuerys to collect payloads, you can
disable collection with a constructor option.
<p>
Note that the return type is a collection, thus the ordering should not be relied upon.
<p>
<div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></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;byte[]&gt; GetPayload()</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.Collections.Generic.ICollection</span>&lt;<span class="xref">System.Byte</span>[]&gt;</td>
<td><p>A <span class="xref">ICollection{byte[]}</span> of byte arrays containing the data of this payload,
otherwise <code>null</code> if <a class="xref" href="Lucene.Net.Search.Spans.Spans.html#Lucene_Net_Search_Spans_Spans_IsPayloadAvailable">IsPayloadAvailable</a> is <code>false</code> </p>
</td>
</tr>
</tbody>
</table>
<h5 class="exceptions">Exceptions</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Condition</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.IOException</span></td>
<td><p>if there is a low-level I/O error </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Spans_Spans_MoveNext_" data-uid="Lucene.Net.Search.Spans.Spans.MoveNext*"></a>
<h4 id="Lucene_Net_Search_Spans_Spans_MoveNext" data-uid="Lucene.Net.Search.Spans.Spans.MoveNext">MoveNext()</h4>
<div class="markdown level1 summary"><p>Move to the next match, returning true if any such exists. </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 MoveNext()</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_Search_Spans_Spans_SkipTo_" data-uid="Lucene.Net.Search.Spans.Spans.SkipTo*"></a>
<h4 id="Lucene_Net_Search_Spans_Spans_SkipTo_System_Int32_" data-uid="Lucene.Net.Search.Spans.Spans.SkipTo(System.Int32)">SkipTo(Int32)</h4>
<div class="markdown level1 summary"><p>Skips to the first match beyond the current, whose document number is
greater than or equal to <em>target</em>.
<p>The behavior of this method is <strong>undefined</strong> when called with
<code> target &lt;= current</code>, or after the iterator has exhausted.
Both cases may result in unpredicted behavior.
<p>Returns <code>true</code> if there is such
a match.<br><p>Behaves as if written: </p>
<pre><code> bool SkipTo(int target)
{
do
{
if (!Next())
return false;
} while (target > Doc);
return true;
}</code></pre>
<p>Most implementations are considerably more efficient than that.</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 SkipTo(int target)</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">target</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>
</article>
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