| /* |
| * 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.Closeable; |
| import java.io.IOException; |
| |
| import org.apache.lucene.analysis.core.WhitespaceAnalyzer; |
| import org.apache.lucene.document.Document; |
| import org.apache.lucene.document.LongPoint; |
| import org.apache.lucene.document.NumericDocValuesField; |
| import org.apache.lucene.facet.DrillDownQuery; |
| import org.apache.lucene.facet.DrillSideways; |
| 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.range.LongRange; |
| import org.apache.lucene.facet.range.LongRangeFacetCounts; |
| import org.apache.lucene.index.DirectoryReader; |
| import org.apache.lucene.index.IndexWriter; |
| import org.apache.lucene.index.IndexWriterConfig.OpenMode; |
| import org.apache.lucene.index.IndexWriterConfig; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.MatchAllDocsQuery; |
| 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. */ |
| public class RangeFacetsExample implements Closeable { |
| |
| private final Directory indexDir = new RAMDirectory(); |
| private IndexSearcher searcher; |
| private final long nowSec = System.currentTimeMillis()/1000L; |
| |
| final LongRange PAST_HOUR = new LongRange("Past hour", nowSec-3600, true, nowSec, true); |
| final LongRange PAST_SIX_HOURS = new LongRange("Past six hours", nowSec-6*3600, true, nowSec, true); |
| final LongRange PAST_DAY = new LongRange("Past day", nowSec-24*3600, true, nowSec, true); |
| |
| /** Empty constructor */ |
| public RangeFacetsExample() {} |
| |
| /** Build the example index. */ |
| public void index() throws IOException { |
| IndexWriter indexWriter = new IndexWriter(indexDir, new IndexWriterConfig( |
| new WhitespaceAnalyzer()).setOpenMode(OpenMode.CREATE)); |
| |
| // Add documents with a fake timestamp, 1000 sec before |
| // "now", 2000 sec before "now", ...: |
| for(int i=0;i<100;i++) { |
| Document doc = new Document(); |
| long then = nowSec - i * 1000; |
| // Add as doc values field, so we can compute range facets: |
| doc.add(new NumericDocValuesField("timestamp", then)); |
| // Add as numeric field so we can drill-down: |
| doc.add(new LongPoint("timestamp", then)); |
| indexWriter.addDocument(doc); |
| } |
| |
| // Open near-real-time searcher |
| searcher = new IndexSearcher(DirectoryReader.open(indexWriter)); |
| indexWriter.close(); |
| } |
| |
| private FacetsConfig getConfig() { |
| return new FacetsConfig(); |
| } |
| |
| /** User runs a query and counts facets. */ |
| public FacetResult search() throws IOException { |
| |
| // Aggregates 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); |
| |
| Facets facets = new LongRangeFacetCounts("timestamp", fc, |
| PAST_HOUR, |
| PAST_SIX_HOURS, |
| PAST_DAY); |
| return facets.getTopChildren(10, "timestamp"); |
| } |
| |
| /** User drills down on the specified range. */ |
| public TopDocs drillDown(LongRange range) throws IOException { |
| |
| // Passing no baseQuery means we drill down on all |
| // documents ("browse only"): |
| DrillDownQuery q = new DrillDownQuery(getConfig()); |
| |
| q.add("timestamp", LongPoint.newRangeQuery("timestamp", range.min, range.max)); |
| return searcher.search(q, 10); |
| } |
| |
| /** User drills down on the specified range, and also computes drill sideways counts. */ |
| public DrillSideways.DrillSidewaysResult drillSideways(LongRange range) throws IOException { |
| // Passing no baseQuery means we drill down on all |
| // documents ("browse only"): |
| DrillDownQuery q = new DrillDownQuery(getConfig()); |
| q.add("timestamp", LongPoint.newRangeQuery("timestamp", range.min, range.max)); |
| |
| // DrillSideways only handles taxonomy and sorted set drill facets by default; to do range facets we must subclass and override the |
| // buildFacetsResult method. |
| DrillSideways.DrillSidewaysResult result = new DrillSideways(searcher, getConfig(), null, null) { |
| @Override |
| protected Facets buildFacetsResult(FacetsCollector drillDowns, FacetsCollector[] drillSideways, String[] drillSidewaysDims) throws IOException { |
| // If we had other dims we would also compute their drill-down or drill-sideways facets here: |
| assert drillSidewaysDims[0].equals("timestamp"); |
| return new LongRangeFacetCounts("timestamp", drillSideways[0], |
| PAST_HOUR, |
| PAST_SIX_HOURS, |
| PAST_DAY); |
| } |
| }.search(q, 10); |
| |
| return result; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| searcher.getIndexReader().close(); |
| indexDir.close(); |
| } |
| |
| /** Runs the search and drill-down examples and prints the results. */ |
| public static void main(String[] args) throws Exception { |
| RangeFacetsExample example = new RangeFacetsExample(); |
| example.index(); |
| |
| System.out.println("Facet counting example:"); |
| System.out.println("-----------------------"); |
| System.out.println(example.search()); |
| |
| System.out.println("\n"); |
| System.out.println("Facet drill-down example (timestamp/Past six hours):"); |
| System.out.println("---------------------------------------------"); |
| TopDocs hits = example.drillDown(example.PAST_SIX_HOURS); |
| System.out.println(hits.totalHits + " totalHits"); |
| |
| System.out.println("\n"); |
| System.out.println("Facet drill-sideways example (timestamp/Past six hours):"); |
| System.out.println("---------------------------------------------"); |
| DrillSideways.DrillSidewaysResult sideways = example.drillSideways(example.PAST_SIX_HOURS); |
| System.out.println(sideways.hits.totalHits + " totalHits"); |
| System.out.println(sideways.facets.getTopChildren(10, "timestamp")); |
| |
| example.close(); |
| } |
| } |