| package org.apache.lucene.demo.facet; |
| |
| /* |
| * 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. |
| */ |
| |
| 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.FacetField; |
| 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.taxonomy.FastTaxonomyFacetCounts; |
| import org.apache.lucene.facet.taxonomy.TaxonomyReader; |
| import org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyReader; |
| import org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyWriter; |
| import org.apache.lucene.index.DirectoryReader; |
| import org.apache.lucene.index.IndexWriter; |
| import org.apache.lucene.index.IndexWriterConfig; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.MatchAllDocsQuery; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.store.RAMDirectory; |
| |
| /** Demonstrates indexing categories into different indexed fields. */ |
| public class MultiCategoryListsFacetsExample { |
| |
| private final Directory indexDir = new RAMDirectory(); |
| private final Directory taxoDir = new RAMDirectory(); |
| private final FacetsConfig config = new FacetsConfig(); |
| |
| /** Creates a new instance and populates the catetory list params mapping. */ |
| public MultiCategoryListsFacetsExample() { |
| config.setIndexFieldName("Author", "author"); |
| config.setIndexFieldName("Publish Date", "pubdate"); |
| config.setHierarchical("Publish Date", true); |
| } |
| |
| /** Build the example index. */ |
| private void index() throws IOException { |
| IndexWriter indexWriter = new IndexWriter(indexDir, new IndexWriterConfig(FacetExamples.EXAMPLES_VER, |
| new WhitespaceAnalyzer(FacetExamples.EXAMPLES_VER))); |
| |
| // Writes facet ords to a separate directory from the main index |
| DirectoryTaxonomyWriter 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> search() 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 results |
| List<FacetResult> results = new ArrayList<FacetResult>(); |
| |
| // Count both "Publish Date" and "Author" dimensions |
| Facets author = new FastTaxonomyFacetCounts("author", taxoReader, config, fc); |
| results.add(author.getTopChildren(10, "Author")); |
| |
| Facets pubDate = new FastTaxonomyFacetCounts("pubdate", taxoReader, config, fc); |
| results.add(pubDate.getTopChildren(10, "Publish Date")); |
| |
| indexReader.close(); |
| taxoReader.close(); |
| |
| return results; |
| } |
| |
| /** Runs the search example. */ |
| public List<FacetResult> runSearch() throws IOException { |
| index(); |
| return search(); |
| } |
| |
| /** Runs the search example and prints the results. */ |
| public static void main(String[] args) throws Exception { |
| System.out.println("Facet counting over multiple category lists example:"); |
| System.out.println("-----------------------"); |
| List<FacetResult> results = new MultiCategoryListsFacetsExample().runSearch(); |
| System.out.println("Author: " + results.get(0)); |
| System.out.println("Publish Date: " + results.get(1)); |
| } |
| } |