Lucene 4.3-facet Demo

 PackageCom.fox.facet;Importjava.io.IOException;Importjava.util.ArrayList;Importjava.util.List;ImportOrg.apache.lucene.analysis.core.WhitespaceAnalyzer;Importorg.apache.lucene.document.Document;ImportOrg.apache.lucene.facet.index.FacetFields;ImportOrg.apache.lucene.facet.params.FacetSearchParams;Importorg.apache.lucene.facet.search.CountFacetRequest;ImportOrg.apache.lucene.facet.search.DrillDownQuery;ImportOrg.apache.lucene.facet.search.FacetResult;ImportOrg.apache.lucene.facet.search.FacetsCollector;ImportOrg.apache.lucene.facet.taxonomy.CategoryPath;ImportOrg.apache.lucene.facet.taxonomy.TaxonomyReader;ImportOrg.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyReader;ImportOrg.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyWriter;ImportOrg.apache.lucene.index.DirectoryReader;ImportOrg.apache.lucene.index.IndexWriter;ImportOrg.apache.lucene.index.IndexWriterConfig;ImportOrg.apache.lucene.search.IndexSearcher;ImportOrg.apache.lucene.search.MatchAllDocsQuery;Importorg.apache.lucene.store.Directory;Importorg.apache.lucene.store.RAMDirectory;Importorg.apache.lucene.util.Version;/** Licensed to the Apache software Foundation (ASF) under one or more * Contributor license agreements. See the NOTICE file distributed with * This work for additional information regarding copyright ownership. * The ASF licenses this file to you under the Apache License, Version 2.0 * (the "License");  You are not a use of this file except in compliance with * the License. Obtain a copy of the License at * *http://www.apache.org/licenses/LICENSE-2.0* * Unless required by applicable or agreed to writing, software * Distributed under the License is distribute D on ' As is ' BASIS, * without warranties or CONDITIONS of any KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *//**shows simple usage of faceted indexing and search.*/ Public classSimplefacetsexample {Private FinalDirectory Indexdir =Newramdirectory (); Private FinalDirectory Taxodir =Newramdirectory (); /**Empty Constructor*/     Publicsimplefacetsexample () {}Private voidAdd (IndexWriter indexwriter, Facetfields facetfields, String ... categorypaths)throwsIOException {Document doc=NewDocument (); List<CategoryPath> paths =NewArraylist<categorypath>();  for(String categorypath:categorypaths) {Paths.add (NewCategorypath (Categorypath, '/'));        } facetfields.addfields (doc, paths);    Indexwriter.adddocument (DOC); }    /**Build The example index.*/    Private voidIndex ()throwsIOException {indexwriter indexwriter=NewIndexWriter (Indexdir,NewIndexwriterconfig (version.lucene_43,NewWhitespaceanalyzer (version.lucene_43)); //writes Facet ords to a separate directory from the main indexDirectorytaxonomywriter Taxowriter =NewDirectorytaxonomywriter (Taxodir); //Reused across documents, to add the necessary facets fieldsFacetfields Facetfields =NewFacetfields (Taxowriter); Add (IndexWriter, Facetfields,"Author/bob", "Publish DATE/2010/10/15"); Add (IndexWriter, Facetfields,"Author/lisa", "Publish date/2010/10/20"); Add (IndexWriter, Facetfields,"Author/lisa", "Publish DATE/2012/1/1"); Add (IndexWriter, Facetfields,"Author/susan", "Publish DATE/2012/1/7"); Add (IndexWriter, Facetfields,"Author/frank", "Publish DATE/1999/5/5");        Indexwriter.close ();    Taxowriter.close (); }    /**User runs a query and counts facets.*/    PrivateList<facetresult> Search ()throwsIOException {directoryreader Indexreader=Directoryreader.open (Indexdir); Indexsearcher Searcher=NewIndexsearcher (Indexreader); Taxonomyreader Taxoreader=NewDirectorytaxonomyreader (Taxodir); //Count both "Publish Date" and "Author" DimensionsFacetsearchparams FSP =NewFacetsearchparams (NewCountfacetrequest (NewCategorypath ("Publish Date"), 10),                NewCountfacetrequest (NewCategorypath ("Author"), 10)); //aggregatses the facet countsFacetscollector FC =facetscollector.create (FSP, Searcher.getindexreader (), taxoreader); //Matchalldocsquery is for "browsing" (counts facets//For all non-deleted docs in the index); Normally//You ' d use a "normal" query, and use the Multicollector to//Wrap collecting the "normal" hits and also facets:Searcher.search (Newmatchalldocsquery (), FC); //Retrieve ResultsList<facetresult> Facetresults =fc.getfacetresults ();        Indexreader.close ();        Taxoreader.close (); returnFacetresults; }    /**User drills down ' Publish date/2010 '.*/    PrivateList<facetresult> DrillDown ()throwsIOException {directoryreader Indexreader=Directoryreader.open (Indexdir); Indexsearcher Searcher=NewIndexsearcher (Indexreader); Taxonomyreader Taxoreader=NewDirectorytaxonomyreader (Taxodir); //Now user drills down on Publish date/2010:Facetsearchparams FSP =NewFacetsearchparams (NewCountfacetrequest (NewCategorypath ("Author"), 10)); Drilldownquery Q=NewDrilldownquery (Fsp.indexingparams,Newmatchalldocsquery ()); Q.add (NewCategorypath ("Publish date/2010", '/')); Facetscollector FC=facetscollector.create (FSP, Searcher.getindexreader (), taxoreader);        Searcher.search (q, FC); //Retrieve ResultsList<facetresult> Facetresults =fc.getfacetresults ();        Indexreader.close ();        Taxoreader.close (); returnFacetresults; }    /**Runs The search example.*/     PublicList<facetresult> Runsearch ()throwsIOException {index (); returnsearch (); }    /**Runs The drill-down example.*/     PublicList<facetresult> Rundrilldown ()throwsIOException {index (); returnDrillDown (); }    /**Runs The search and drill-down examples and prints the results.*/     Public Static voidMain (string[] args)throwsException {System.out.println ("Facet Counting Example:"); System.out.println ("-----------------------"); List<FacetResult> results =Newsimplefacetsexample (). Runsearch ();  for(Facetresult res:results) {System.out.println (res); } System.out.println ("\ n"); System.out.println ("Facet Drill-down Example (Publish date/2010):"); System.out.println ("---------------------------------------------"); Results=Newsimplefacetsexample (). Rundrilldown ();  for(Facetresult res:results) {System.out.println (res); }    }}

Result:

Facet Counting Example:-----------------------request:publish Date nres=10 nlbl=10Num valid descendants (up to specified depth):3Publish Date (0.0) Publish Date/2012 (2.0) Publish Date/2010 (2.0) Publish Date/1999 (1.0) Request:author nres=10 nlbl=10Num valid descendants (up to specified depth):4Author (0.0) Author/lisa (2.0) Author/frank (1.0) Author/susan (1.0) Author/bob (1.0) Facet Drill-down Example (Publish date/2010):---------------------------------------------Request:author nres=10 nlbl=10Num valid descendants (up to specified depth):2Author (0.0) Author/lisa (1.0) Author/bob (1.0)

Lucene 4.3-facet Demo