| /* |
| * 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.benchmark.quality.utils; |
| |
| import java.io.IOException; |
| import java.nio.file.Paths; |
| import org.apache.lucene.index.DirectoryReader; |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.MultiTerms; |
| import org.apache.lucene.index.Terms; |
| import org.apache.lucene.index.TermsEnum; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.store.FSDirectory; |
| import org.apache.lucene.util.PriorityQueue; |
| |
| /** |
| * Suggest Quality queries based on an index contents. Utility class, used for making quality test |
| * benchmarks. |
| */ |
| public class QualityQueriesFinder { |
| |
| private static final String newline = System.getProperty("line.separator"); |
| private Directory dir; |
| |
| /** |
| * Constructor over a directory containing the index. |
| * |
| * @param dir directory containing the index we search for the quality test. |
| */ |
| private QualityQueriesFinder(Directory dir) { |
| this.dir = dir; |
| } |
| |
| /** |
| * @param args {index-dir} |
| * @throws IOException if cannot access the index. |
| */ |
| public static void main(String[] args) throws IOException { |
| if (args.length < 1) { |
| System.err.println("Usage: java QualityQueriesFinder <index-dir>"); |
| System.exit(1); |
| } |
| QualityQueriesFinder qqf = new QualityQueriesFinder(FSDirectory.open(Paths.get(args[0]))); |
| String q[] = qqf.bestQueries("body", 20); |
| for (int i = 0; i < q.length; i++) { |
| System.out.println(newline + formatQueryAsTrecTopic(i, q[i], null, null)); |
| } |
| } |
| |
| private String[] bestQueries(String field, int numQueries) throws IOException { |
| String words[] = bestTerms("body", 4 * numQueries); |
| int n = words.length; |
| int m = n / 4; |
| String res[] = new String[m]; |
| for (int i = 0; i < res.length; i++) { |
| res[i] = words[i] + " " + words[m + i] + " " + words[n - 1 - m - i] + " " + words[n - 1 - i]; |
| // System.out.println("query["+i+"]: "+res[i]); |
| } |
| return res; |
| } |
| |
| private static String formatQueryAsTrecTopic( |
| int qnum, String title, String description, String narrative) { |
| return "<top>" |
| + newline |
| + "<num> Number: " |
| + qnum |
| + newline |
| + newline |
| + "<title> " |
| + (title == null ? "" : title) |
| + newline |
| + newline |
| + "<desc> Description:" |
| + newline |
| + (description == null ? "" : description) |
| + newline |
| + newline |
| + "<narr> Narrative:" |
| + newline |
| + (narrative == null ? "" : narrative) |
| + newline |
| + newline |
| + "</top>"; |
| } |
| |
| private String[] bestTerms(String field, int numTerms) throws IOException { |
| PriorityQueue<TermDf> pq = new TermsDfQueue(numTerms); |
| IndexReader ir = DirectoryReader.open(dir); |
| try { |
| int threshold = ir.maxDoc() / 10; // ignore words too common. |
| Terms terms = MultiTerms.getTerms(ir, field); |
| if (terms != null) { |
| TermsEnum termsEnum = terms.iterator(); |
| while (termsEnum.next() != null) { |
| int df = termsEnum.docFreq(); |
| if (df < threshold) { |
| String ttxt = termsEnum.term().utf8ToString(); |
| pq.insertWithOverflow(new TermDf(ttxt, df)); |
| } |
| } |
| } |
| } finally { |
| ir.close(); |
| } |
| String res[] = new String[pq.size()]; |
| int i = 0; |
| while (pq.size() > 0) { |
| TermDf tdf = pq.pop(); |
| res[i++] = tdf.word; |
| System.out.println(i + ". word: " + tdf.df + " " + tdf.word); |
| } |
| return res; |
| } |
| |
| private static class TermDf { |
| String word; |
| int df; |
| |
| TermDf(String word, int freq) { |
| this.word = word; |
| this.df = freq; |
| } |
| } |
| |
| private static class TermsDfQueue extends PriorityQueue<TermDf> { |
| TermsDfQueue(int maxSize) { |
| super(maxSize); |
| } |
| |
| @Override |
| protected boolean lessThan(TermDf tf1, TermDf tf2) { |
| return tf1.df < tf2.df; |
| } |
| } |
| } |