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Apache Lucene (module: benchmark)
/**
* 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.File;
import java.io.IOException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermEnum;
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 ");
System.exit(1);
}
QualityQueriesFinder qqf = new QualityQueriesFinder(FSDirectory.open(new File(args[0])));
String q[] = qqf.bestQueries("body",20);
for (int i=0; i" + newline +
" Number: " + qnum + newline + newline +
" " + (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 pq = new TermsDfQueue(numTerms);
IndexReader ir = IndexReader.open(dir);
try {
int threshold = ir.maxDoc() / 10; // ignore words too common.
TermEnum terms = ir.terms(new Term(field,""));
while (terms.next()) {
if (!field.equals(terms.term().field())) {
break;
}
int df = terms.docFreq();
if (df<threshold) {
String ttxt = terms.term().text();
pq.insert(new TermDf(ttxt,df));
}
}
} finally {
ir.close();
}
String res[] = new String[pq.size()];
int i = 0;
while (pq.size()>0) {
TermDf tdf = (TermDf) 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 {
TermsDfQueue (int maxSize) {
initialize(maxSize);
}
protected boolean lessThan(Object a, Object b) {
TermDf tf1 = (TermDf) a;
TermDf tf2 = (TermDf) b;
return tf1.df < tf2.df;
}
}
}
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