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| |
| <h1 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder" class="text-break">Class FSTCompletionBuilder |
| </h1> |
| <div class="markdown level0 summary"><p>Finite state automata based implementation of "autocomplete" functionality.</p> |
| <h2>Implementation details</h2> |
| |
| <p> |
| The construction step in the object finalizer works as follows: |
| <ul><li>A set of input terms and their buckets is given.</li><li>All terms in the input are prefixed with a synthetic pseudo-character |
| (code) of the weight bucket the term fell into. For example a term |
| <code>abc</code> with a discretized weight equal '1' would become |
| <code>1abc</code>.</li><li>The terms are then sorted by their raw value of UTF-8 character values |
| (including the synthetic bucket code in front).</li><li>A finite state automaton (<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.Fst.FST.html">FST</a>) is constructed from the input. The |
| root node has arcs labeled with all possible weights. We cache all these |
| arcs, highest-weight first.</li></ul> |
| |
| </p> |
| <p> |
| At runtime, in <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html#Lucene_Net_Search_Suggest_Fst_FSTCompletion_DoLookup_System_String_System_Int32_">DoLookup(String, Int32)</a>, |
| the automaton is utilized as follows: |
| <ul><li>For each possible term weight encoded in the automaton (cached arcs from |
| the root above), starting with the highest one, we descend along the path of |
| the input key. If the key is not a prefix of a sequence in the automaton |
| (path ends prematurely), we exit immediately -- no completions.</li><li>Otherwise, we have found an internal automaton node that ends the key. |
| <strong>The entire subautomaton (all paths) starting from this node form the key's |
| completions.</strong> We start the traversal of this subautomaton. Every time we |
| reach a final state (arc), we add a single suggestion to the list of results |
| (the weight of this suggestion is constant and equal to the root path we |
| started from). The tricky part is that because automaton edges are sorted and |
| we scan depth-first, we can terminate the entire procedure as soon as we |
| collect enough suggestions the user requested.</li><li>In case the number of suggestions collected in the step above is still |
| insufficient, we proceed to the next (smaller) weight leaving the root node |
| and repeat the same algorithm again.</li></ul> |
| |
| <h2>Runtime behavior and performance characteristic</h2> |
| |
| The algorithm described above is optimized for finding suggestions to short |
| prefixes in a top-weights-first order. This is probably the most common use |
| case: it allows presenting suggestions early and sorts them by the global |
| frequency (and then alphabetically). |
| |
| </p> |
| <p> |
| If there is an exact match in the automaton, it is returned first on the |
| results list (even with by-weight sorting). |
| |
| </p> |
| <p> |
| Note that the maximum lookup time for <strong>any prefix</strong> is the time of |
| descending to the subtree, plus traversal of the subtree up to the number of |
| requested suggestions (because they are already presorted by weight on the |
| root level and alphabetically at any node level). |
| |
| </p> |
| <p> |
| To order alphabetically only (no ordering by priorities), use identical term |
| weights for all terms. Alphabetical suggestions are returned even if |
| non-constant weights are used, but the algorithm for doing this is |
| suboptimal. |
| |
| </p> |
| <p> |
| "alphabetically" in any of the documentation above indicates UTF-8 |
| representation order, nothing else. |
| |
| </p> |
| <p> |
| <strong>NOTE</strong>: the FST file format is experimental and subject to suddenly |
| change, requiring you to rebuild the FST suggest index. |
| |
| </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">FSTCompletionBuilder</span></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.Suggest.Fst.html">Lucene.Net.Search.Suggest.Fst</a></h6> |
| <h6><strong>Assembly</strong>: Lucene.Net.Suggest.dll</h6> |
| <h5 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_syntax">Syntax</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public class FSTCompletionBuilder</code></pre> |
| </div> |
| <h3 id="constructors">Constructors |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder__ctor.md&value=---%0Auid%3A%20Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.%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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Suggest/Suggest/Fst/FSTCompletionBuilder.cs/#L156">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder__ctor_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.#ctor*"></a> |
| <h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder__ctor" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.#ctor">FSTCompletionBuilder()</h4> |
| <div class="markdown level1 summary"><p>Creates an <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a> with default options: 10 buckets, exact match |
| promoted to first position and <a class="xref" href="Lucene.Net.Search.Suggest.InMemorySorter.html">InMemorySorter</a> with a comparer obtained from |
| <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.BytesRef.html#Lucene_Net_Util_BytesRef_UTF8SortedAsUnicodeComparer">UTF8SortedAsUnicodeComparer</a>.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public FSTCompletionBuilder()</code></pre> |
| </div> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder__ctor_System_Int32_Lucene_Net_Search_Suggest_Fst_IBytesRefSorter_System_Int32_.md&value=---%0Auid%3A%20Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.%23ctor(System.Int32%2CLucene.Net.Search.Suggest.Fst.IBytesRefSorter%2CSystem.Int32)%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 href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Suggest/Suggest/Fst/FSTCompletionBuilder.cs/#L181">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder__ctor_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.#ctor*"></a> |
| <h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder__ctor_System_Int32_Lucene_Net_Search_Suggest_Fst_IBytesRefSorter_System_Int32_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.#ctor(System.Int32,Lucene.Net.Search.Suggest.Fst.IBytesRefSorter,System.Int32)">FSTCompletionBuilder(Int32, IBytesRefSorter, Int32)</h4> |
| <div class="markdown level1 summary"><p>Creates an FSTCompletion with the specified options. </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public FSTCompletionBuilder(int buckets, IBytesRefSorter sorter, int shareMaxTailLength)</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">buckets</span></td> |
| <td><p>The number of buckets for weight discretization. Buckets are used |
| in <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.html#Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_Add_Lucene_Net_Util_BytesRef_System_Int32_">Add(BytesRef, Int32)</a> and must be smaller than the number |
| given here.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Search.Suggest.Fst.IBytesRefSorter.html">IBytesRefSorter</a></td> |
| <td><span class="parametername">sorter</span></td> |
| <td><p><a class="xref" href="Lucene.Net.Search.Suggest.Fst.IBytesRefSorter.html">IBytesRefSorter</a> used for re-sorting input for the automaton. |
| For large inputs, use on-disk sorting implementations. The sorter |
| is closed automatically in <a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.html#Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_Build">Build()</a> if it implements |
| <span class="xref">System.IDisposable</span>.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">shareMaxTailLength</span></td> |
| <td><p>Max shared suffix sharing length.</p> |
| <p>See the description of this parameter in <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Util.Fst.Builder.html">Builder</a>'s constructor. |
| In general, for very large inputs you'll want to construct a non-minimal |
| automaton which will be larger, but the construction will take far less ram. |
| For minimal automata, set it to <span class="xref">System.Int32.MaxValue</span>. </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <h3 id="fields">Fields |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_DEFAULT_BUCKETS.md&value=---%0Auid%3A%20Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.DEFAULT_BUCKETS%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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Suggest/Suggest/Fst/FSTCompletionBuilder.cs/#L112">View Source</a> |
| </span> |
| <h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_DEFAULT_BUCKETS" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.DEFAULT_BUCKETS">DEFAULT_BUCKETS</h4> |
| <div class="markdown level1 summary"><p>Default number of buckets.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public const int DEFAULT_BUCKETS = 10</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> |
| <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-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_Add_Lucene_Net_Util_BytesRef_System_Int32_.md&value=---%0Auid%3A%20Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.Add(Lucene.Net.Util.BytesRef%2CSystem.Int32)%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> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Suggest/Suggest/Fst/FSTCompletionBuilder.cs/#L209">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_Add_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.Add*"></a> |
| <h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_Add_Lucene_Net_Util_BytesRef_System_Int32_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.Add(Lucene.Net.Util.BytesRef,System.Int32)">Add(BytesRef, Int32)</h4> |
| <div class="markdown level1 summary"><p>Appends a single suggestion and its weight to the internal buffers.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual void Add(BytesRef utf8, int bucket)</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.Util.BytesRef</span></td> |
| <td><span class="parametername">utf8</span></td> |
| <td><p>The suggestion (utf8 representation) to be added. The content is |
| copied and the object can be reused. </p> |
| </td> |
| </tr> |
| <tr> |
| <td><span class="xref">System.Int32</span></td> |
| <td><span class="parametername">bucket</span></td> |
| <td><p>The bucket to place this suggestion in. Must be non-negative and |
| smaller than the number of buckets passed in the constructor. |
| Higher numbers indicate suggestions that should be presented |
| before suggestions placed in smaller buckets. </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_Build.md&value=---%0Auid%3A%20Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.Build%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 href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net.Suggest/Suggest/Fst/FSTCompletionBuilder.cs/#L231">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_Build_" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.Build*"></a> |
| <h4 id="Lucene_Net_Search_Suggest_Fst_FSTCompletionBuilder_Build" data-uid="Lucene.Net.Search.Suggest.Fst.FSTCompletionBuilder.Build">Build()</h4> |
| <div class="markdown level1 summary"><p>Builds the final automaton from a list of added entries. This method may |
| take a longer while as it needs to build the automaton.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual FSTCompletion Build()</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.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h3 id="seealso">See Also</h3> |
| <div class="seealso"> |
| <div><a class="xref" href="Lucene.Net.Search.Suggest.Fst.FSTCompletion.html">FSTCompletion</a></div> |
| </div> |
| </article> |
| </div> |
| |
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