| 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.Closeable; |
| import java.io.IOException; |
| import java.text.ParseException; |
| |
| import org.apache.lucene.analysis.core.WhitespaceAnalyzer; |
| import org.apache.lucene.document.Document; |
| import org.apache.lucene.document.DoubleField; |
| import org.apache.lucene.document.Field; |
| import org.apache.lucene.expressions.Expression; |
| import org.apache.lucene.expressions.SimpleBindings; |
| import org.apache.lucene.expressions.js.JavascriptCompiler; |
| 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.range.DoubleRange; |
| import org.apache.lucene.facet.range.DoubleRangeFacetCounts; |
| import org.apache.lucene.index.DirectoryReader; |
| import org.apache.lucene.index.IndexWriter; |
| import org.apache.lucene.index.IndexWriterConfig; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.search.ConstantScoreQuery; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.MatchAllDocsQuery; |
| import org.apache.lucene.search.SortField; |
| import org.apache.lucene.search.TopDocs; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.store.RAMDirectory; |
| |
| |
| |
| /** Shows simple usage of dynamic range faceting, using the |
| * expressions module to calculate distance. */ |
| public class DistanceFacetsExample implements Closeable { |
| |
| final DoubleRange ONE_KM = new DoubleRange("< 1 km", 0.0, true, 1.0, false); |
| final DoubleRange TWO_KM = new DoubleRange("< 2 km", 0.0, true, 2.0, false); |
| final DoubleRange FIVE_KM = new DoubleRange("< 5 km", 0.0, true, 5.0, false); |
| final DoubleRange TEN_KM = new DoubleRange("< 10 km", 0.0, true, 10.0, false); |
| |
| private final Directory indexDir = new RAMDirectory(); |
| private IndexSearcher searcher; |
| |
| /** Empty constructor */ |
| public DistanceFacetsExample() {} |
| |
| /** Build the example index. */ |
| public void index() throws IOException { |
| IndexWriter writer = new IndexWriter(indexDir, new IndexWriterConfig(FacetExamples.EXAMPLES_VER, |
| new WhitespaceAnalyzer(FacetExamples.EXAMPLES_VER))); |
| |
| // Add documents with latitude/longitude location: |
| Document doc = new Document(); |
| doc.add(new DoubleField("latitude", 40.759011, Field.Store.NO)); |
| doc.add(new DoubleField("longitude", -73.9844722, Field.Store.NO)); |
| writer.addDocument(doc); |
| |
| doc = new Document(); |
| doc.add(new DoubleField("latitude", 40.718266, Field.Store.NO)); |
| doc.add(new DoubleField("longitude", -74.007819, Field.Store.NO)); |
| writer.addDocument(doc); |
| |
| doc = new Document(); |
| doc.add(new DoubleField("latitude", 40.7051157, Field.Store.NO)); |
| doc.add(new DoubleField("longitude", -74.0088305, Field.Store.NO)); |
| writer.addDocument(doc); |
| |
| // Open near-real-time searcher |
| searcher = new IndexSearcher(DirectoryReader.open(writer, true)); |
| writer.close(); |
| } |
| |
| private ValueSource getDistanceValueSource() { |
| Expression distance; |
| try { |
| distance = JavascriptCompiler.compile("haversin(40.7143528,-74.0059731,latitude,longitude)"); |
| } catch (ParseException pe) { |
| // Should not happen |
| throw new RuntimeException(pe); |
| } |
| SimpleBindings bindings = new SimpleBindings(); |
| bindings.add(new SortField("latitude", SortField.Type.DOUBLE)); |
| bindings.add(new SortField("longitude", SortField.Type.DOUBLE)); |
| |
| return distance.getValueSource(bindings); |
| } |
| |
| /** User runs a query and counts facets. */ |
| public FacetResult search() throws IOException { |
| |
| |
| FacetsCollector fc = new FacetsCollector(); |
| |
| searcher.search(new MatchAllDocsQuery(), fc); |
| |
| Facets facets = new DoubleRangeFacetCounts("field", getDistanceValueSource(), fc, |
| ONE_KM, |
| TWO_KM, |
| FIVE_KM, |
| TEN_KM); |
| |
| return facets.getTopChildren(10, "field"); |
| } |
| |
| /** User drills down on the specified range. */ |
| public TopDocs drillDown(DoubleRange range) throws IOException { |
| |
| // Passing no baseQuery means we drill down on all |
| // documents ("browse only"): |
| DrillDownQuery q = new DrillDownQuery(null); |
| |
| q.add("field", new ConstantScoreQuery(range.getFilter(getDistanceValueSource()))); |
| |
| return searcher.search(q, 10); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| searcher.getIndexReader().close(); |
| indexDir.close(); |
| } |
| |
| /** Runs the search and drill-down examples and prints the results. */ |
| @SuppressWarnings("unchecked") |
| public static void main(String[] args) throws Exception { |
| DistanceFacetsExample example = new DistanceFacetsExample(); |
| example.index(); |
| |
| System.out.println("Distance facet counting example:"); |
| System.out.println("-----------------------"); |
| System.out.println(example.search()); |
| |
| System.out.println("\n"); |
| System.out.println("Distance facet drill-down example (field/< 2 km):"); |
| System.out.println("---------------------------------------------"); |
| TopDocs hits = example.drillDown(example.TWO_KM); |
| System.out.println(hits.totalHits + " totalHits"); |
| |
| example.close(); |
| } |
| } |