alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lucene example source code file (TestSetNorm.java)

This example Lucene source code file (TestSetNorm.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

document, document, exception, fieldable, indexsearcher, indexsearcher, indexwriter, io, ioexception, ioexception, mockanalyzer, override, override, term, testsetnorm

The Lucene TestSetNorm.java source code

package org.apache.lucene.search;

/**
 * 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 org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.*;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;

/** Document boost unit test.
 *
 *
 * @version $Revision: 1091277 $
 */
public class TestSetNorm extends LuceneTestCase {

  public void testSetNorm() throws Exception {
    Directory store = newDirectory();
    IndexWriter writer = new IndexWriter(store, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));

    // add the same document four times
    Fieldable f1 = newField("field", "word", Field.Store.YES, Field.Index.ANALYZED);
    Document d1 = new Document();
    d1.add(f1);
    writer.addDocument(d1);
    writer.addDocument(d1);
    writer.addDocument(d1);
    writer.addDocument(d1);
    writer.close();

    // reset the boost of each instance of this document
    IndexReader reader = IndexReader.open(store, false);
    reader.setNorm(0, "field", 1.0f);
    reader.setNorm(1, "field", 2.0f);
    reader.setNorm(2, "field", 4.0f);
    reader.setNorm(3, "field", 16.0f);
    reader.close();

    // check that searches are ordered by this boost
    final float[] scores = new float[4];

    IndexSearcher is = new IndexSearcher(store, true);
    is.search
      (new TermQuery(new Term("field", "word")),
       new Collector() {
         private int base = 0;
         private Scorer scorer;
         @Override
         public void setScorer(Scorer scorer) throws IOException {
          this.scorer = scorer;
         }
         @Override
         public final void collect(int doc) throws IOException {
           scores[doc + base] = scorer.score();
         }
         @Override
         public void setNextReader(IndexReader reader, int docBase) {
           base = docBase;
         }
         @Override
         public boolean acceptsDocsOutOfOrder() {
           return true;
         }
       });
    is.close();
    float lastScore = 0.0f;

    for (int i = 0; i < 4; i++) {
      assertTrue(scores[i] > lastScore);
      lastScore = scores[i];
    }
    store.close();
  }
}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene TestSetNorm.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.