| /* |
| * 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 may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "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. |
| */ |
| package org.apache.lucene.demo.facet; |
| |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.lucene.analysis.core.WhitespaceAnalyzer; |
| import org.apache.lucene.document.Document; |
| import org.apache.lucene.facet.DrillDownQuery; |
| import org.apache.lucene.facet.FacetResult; |
| import org.apache.lucene.facet.Facets; |
| import org.apache.lucene.facet.FacetsCollector; |
| import org.apache.lucene.facet.FacetsConfig; |
| import org.apache.lucene.facet.sortedset.DefaultSortedSetDocValuesReaderState; |
| import org.apache.lucene.facet.sortedset.SortedSetDocValuesFacetCounts; |
| import org.apache.lucene.facet.sortedset.SortedSetDocValuesFacetField; |
| import org.apache.lucene.facet.sortedset.SortedSetDocValuesReaderState; |
| import org.apache.lucene.index.DirectoryReader; |
| import org.apache.lucene.index.IndexWriter; |
| import org.apache.lucene.index.IndexWriterConfig; |
| import org.apache.lucene.index.IndexWriterConfig.OpenMode; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.MatchAllDocsQuery; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.store.RAMDirectory; |
| |
| /** Shows simple usage of faceted indexing and search, |
| * using {@link SortedSetDocValuesFacetField} and {@link |
| * SortedSetDocValuesFacetCounts}. */ |
| |
| public class SimpleSortedSetFacetsExample { |
| |
| private final Directory indexDir = new RAMDirectory(); |
| private final FacetsConfig config = new FacetsConfig(); |
| |
| /** Empty constructor */ |
| public SimpleSortedSetFacetsExample() { |
| } |
| |
| /** Build the example index. */ |
| private void index() throws IOException { |
| IndexWriter indexWriter = new IndexWriter(indexDir, new IndexWriterConfig( |
| new WhitespaceAnalyzer()).setOpenMode(OpenMode.CREATE)); |
| Document doc = new Document(); |
| doc.add(new SortedSetDocValuesFacetField("Author", "Bob")); |
| doc.add(new SortedSetDocValuesFacetField("Publish Year", "2010")); |
| indexWriter.addDocument(config.build(doc)); |
| |
| doc = new Document(); |
| doc.add(new SortedSetDocValuesFacetField("Author", "Lisa")); |
| doc.add(new SortedSetDocValuesFacetField("Publish Year", "2010")); |
| indexWriter.addDocument(config.build(doc)); |
| |
| doc = new Document(); |
| doc.add(new SortedSetDocValuesFacetField("Author", "Lisa")); |
| doc.add(new SortedSetDocValuesFacetField("Publish Year", "2012")); |
| indexWriter.addDocument(config.build(doc)); |
| |
| doc = new Document(); |
| doc.add(new SortedSetDocValuesFacetField("Author", "Susan")); |
| doc.add(new SortedSetDocValuesFacetField("Publish Year", "2012")); |
| indexWriter.addDocument(config.build(doc)); |
| |
| doc = new Document(); |
| doc.add(new SortedSetDocValuesFacetField("Author", "Frank")); |
| doc.add(new SortedSetDocValuesFacetField("Publish Year", "1999")); |
| indexWriter.addDocument(config.build(doc)); |
| |
| indexWriter.close(); |
| } |
| |
| /** User runs a query and counts facets. */ |
| private List<FacetResult> search() throws IOException { |
| DirectoryReader indexReader = DirectoryReader.open(indexDir); |
| IndexSearcher searcher = new IndexSearcher(indexReader); |
| SortedSetDocValuesReaderState state = new DefaultSortedSetDocValuesReaderState(indexReader); |
| |
| // Aggregatses the facet counts |
| 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 results |
| Facets facets = new SortedSetDocValuesFacetCounts(state, fc); |
| |
| List<FacetResult> results = new ArrayList<>(); |
| results.add(facets.getTopChildren(10, "Author")); |
| results.add(facets.getTopChildren(10, "Publish Year")); |
| indexReader.close(); |
| |
| return results; |
| } |
| |
| /** User drills down on 'Publish Year/2010'. */ |
| private FacetResult drillDown() throws IOException { |
| DirectoryReader indexReader = DirectoryReader.open(indexDir); |
| IndexSearcher searcher = new IndexSearcher(indexReader); |
| SortedSetDocValuesReaderState state = new DefaultSortedSetDocValuesReaderState(indexReader); |
| |
| // Now user drills down on Publish Year/2010: |
| DrillDownQuery q = new DrillDownQuery(config); |
| q.add("Publish Year", "2010"); |
| FacetsCollector fc = new FacetsCollector(); |
| FacetsCollector.search(searcher, q, 10, fc); |
| |
| // Retrieve results |
| Facets facets = new SortedSetDocValuesFacetCounts(state, fc); |
| FacetResult result = facets.getTopChildren(10, "Author"); |
| indexReader.close(); |
| |
| return result; |
| } |
| |
| /** Runs the search example. */ |
| public List<FacetResult> runSearch() throws IOException { |
| index(); |
| return search(); |
| } |
| |
| /** Runs the drill-down example. */ |
| public FacetResult runDrillDown() throws IOException { |
| index(); |
| return drillDown(); |
| } |
| |
| /** 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("-----------------------"); |
| SimpleSortedSetFacetsExample example = new SimpleSortedSetFacetsExample(); |
| List<FacetResult> results = example.runSearch(); |
| System.out.println("Author: " + results.get(0)); |
| System.out.println("Publish Year: " + results.get(0)); |
| |
| System.out.println("\n"); |
| System.out.println("Facet drill-down example (Publish Year/2010):"); |
| System.out.println("---------------------------------------------"); |
| System.out.println("Author: " + example.runDrillDown()); |
| } |
| } |