簡單的facet實例

public class SimpleFacetsExample {private final Directory indexDir = new RAMDirectory();private final Directory taxoDir = new RAMDirectory();private final FacetsConfig config = new FacetsConfig();/** Empty constructor */public SimpleFacetsExample() {config.setHierarchical("Publish Date", true);}/** Build the example index. */private void index() throws IOException {IndexWriter indexWriter = new IndexWriter(indexDir, new IndexWriterConfig(new WhitespaceAnalyzer()).setOpenMode(OpenMode.CREATE));// Writes facet ords to a separate directory from the main indexDirectoryTaxonomyWriter taxoWriter = new DirectoryTaxonomyWriter(taxoDir);Document doc = new Document();doc.add(new FacetField("Author", "Bob"));doc.add(new FacetField("Publish Date", "2010", "10", "15"));indexWriter.addDocument(config.build(taxoWriter, doc));doc = new Document();doc.add(new FacetField("Author", "Lisa"));doc.add(new FacetField("Publish Date", "2010", "10", "20"));indexWriter.addDocument(config.build(taxoWriter, doc));doc = new Document();doc.add(new FacetField("Author", "Lisa"));doc.add(new FacetField("Publish Date", "2012", "1", "1"));indexWriter.addDocument(config.build(taxoWriter, doc));doc = new Document();doc.add(new FacetField("Author", "Susan"));doc.add(new FacetField("Publish Date", "2012", "1", "7"));indexWriter.addDocument(config.build(taxoWriter, doc));doc = new Document();doc.add(new FacetField("Author", "Frank"));doc.add(new FacetField("Publish Date", "1999", "5", "5"));indexWriter.addDocument(config.build(taxoWriter, doc));indexWriter.close();taxoWriter.close();}/** User runs a query and counts facets. */private List<FacetResult> facetsWithSearch() throws IOException {DirectoryReader indexReader = DirectoryReader.open(indexDir);IndexSearcher searcher = new IndexSearcher(indexReader);TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);FacetsCollector fc = new FacetsCollector();// MatchAllDocsQuery is for "browsing" (counts facets// for all non-deleted docs in the index); normally// you'd use a "normal" query:FacetsCollector.search(searcher, new MatchAllDocsQuery(), 10, fc);// Retrieve resultsList<FacetResult> results = new ArrayList<>();// Count both "Publish Date" and "Author" dimensionsFacets facets = new FastTaxonomyFacetCounts(taxoReader, config, fc);results.add(facets.getTopChildren(10, "Author"));results.add(facets.getTopChildren(10, "Publish Date"));indexReader.close();taxoReader.close();return results;}/** User runs a query and counts facets only without collecting the matching documents.*/private List<FacetResult> facetsOnly() throws IOException {DirectoryReader indexReader = DirectoryReader.open(indexDir);IndexSearcher searcher = new IndexSearcher(indexReader);TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);FacetsCollector fc = new FacetsCollector();// MatchAllDocsQuery is for "browsing" (counts facets// for all non-deleted docs in the index); normally// you'd use a "normal" query:searcher.search(new MatchAllDocsQuery(), fc);// Retrieve resultsList<FacetResult> results = new ArrayList<>();// Count both "Publish Date" and "Author" dimensionsFacets facets = new FastTaxonomyFacetCounts(taxoReader, config, fc);results.add(facets.getTopChildren(10, "Author"));results.add(facets.getTopChildren(10, "Publish Date"));indexReader.close();taxoReader.close();return results;}/** User drills down on 'Publish Date/2010', and we* return facets for 'Author' */private FacetResult drillDown() throws IOException {DirectoryReader indexReader = DirectoryReader.open(indexDir);IndexSearcher searcher = new IndexSearcher(indexReader);TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);// Passing no baseQuery means we drill down on all// documents ("browse only"):DrillDownQuery q = new DrillDownQuery(config);// Now user drills down on Publish Date/2010:q.add("Publish Date", "2010");FacetsCollector fc = new FacetsCollector();FacetsCollector.search(searcher, q, 10, fc);// Retrieve resultsFacets facets = new FastTaxonomyFacetCounts(taxoReader, config, fc);FacetResult result = facets.getTopChildren(10, "Author");indexReader.close();taxoReader.close();return result;}/** User drills down on 'Publish Date/2010', and we* return facets for both 'Publish Date' and 'Author',* using DrillSideways. */private List<FacetResult> drillSideways() throws IOException {DirectoryReader indexReader = DirectoryReader.open(indexDir);IndexSearcher searcher = new IndexSearcher(indexReader);TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);// Passing no baseQuery means we drill down on all// documents ("browse only"):DrillDownQuery q = new DrillDownQuery(config);// Now user drills down on Publish Date/2010:q.add("Publish Date", "2010");DrillSideways ds = new DrillSideways(searcher, config, taxoReader);DrillSidewaysResult result = ds.search(q, 10);// Retrieve resultsList<FacetResult> facets = result.facets.getAllDims(10);indexReader.close();taxoReader.close();return facets;}/** Runs the search example. */public List<FacetResult> runFacetOnly() throws IOException {index();return facetsOnly();}/** Runs the search example. */public List<FacetResult> runSearch() throws IOException {index();return facetsWithSearch();}/** Runs the drill-down example. */public FacetResult runDrillDown() throws IOException {index();return drillDown();}/** Runs the drill-sideways example. */public List<FacetResult> runDrillSideways() throws IOException {index();return drillSideways();}/** Runs the search and drill-down examples and prints the results. */public static void main(String[] args) throws Exception {System.out.println("Facet counting example:");System.out.println("-----------------------");SimpleFacetsExample example = new SimpleFacetsExample();List<FacetResult> results1 = example.runFacetOnly();System.out.println("Author: " + results1.get(0));System.out.println("Publish Date: " + results1.get(1));System.out.println("Facet counting example (combined facets and search):");System.out.println("-----------------------");List<FacetResult> results = example.runSearch();System.out.println("Author: " + results.get(0));System.out.println("Publish Date: " + results.get(1));System.out.println("Facet drill-down example (Publish Date/2010):");System.out.println("---------------------------------------------");System.out.println("Author: " + example.runDrillDown());System.out.println("Facet drill-sideways example (Publish Date/2010):");System.out.println("---------------------------------------------");for(FacetResult result : example.runDrillSideways()) {System.out.println(result);}}}

查詢及其關系

查詢

/** Lower-level search API.** <p>{@link LeafCollector#collect(int)} is called for every matching document.** @throws BooleanQuery.TooManyClauses If a query would exceed * {@link BooleanQuery#getMaxClauseCount()} clauses.*/public void search(Query query, Collector results)throws IOException {query = rewrite(query); search(leafContexts, createWeight(query, results.needsScores(), 1), results); }

關系

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轉載于:https://www.cnblogs.com/davidwang456/p/9952368.html

總結

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