TestSpanFirstQuery.java example

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lucene-solr-master
- lucene
- solr
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 * 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
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package org.apache.lucene.search.spans;


import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.MockTokenizer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.automaton.CharacterRunAutomaton;
import org.apache.lucene.util.automaton.RegExp;

import static org.apache.lucene.search.spans.SpanTestUtil.*;

public class TestSpanFirstQuery extends LuceneTestCase {
  public void testStartPositions() throws Exception {
    Directory dir = newDirectory();
    
    // mimic StopAnalyzer
    CharacterRunAutomaton stopSet = new CharacterRunAutomaton(new RegExp("the|a|of").toAutomaton());
    Analyzer analyzer = new MockAnalyzer(random(), MockTokenizer.SIMPLE, true, stopSet);
    
    RandomIndexWriter writer = new RandomIndexWriter(random(), dir, analyzer);
    Document doc = new Document();
    doc.add(newTextField("field", "the quick brown fox", Field.Store.NO));
    writer.addDocument(doc);
    Document doc2 = new Document();
    doc2.add(newTextField("field", "quick brown fox", Field.Store.NO));
    writer.addDocument(doc2);
    
    IndexReader reader = writer.getReader();
    IndexSearcher searcher = newSearcher(reader);
    
    // user queries on "starts-with quick"
    SpanQuery sfq = spanFirstQuery(spanTermQuery("field", "quick"), 1);
    assertEquals(1, searcher.search(sfq, 10).totalHits);
    
    // user queries on "starts-with the quick"
    SpanQuery include = spanFirstQuery(spanTermQuery("field", "quick"), 2);
    sfq = spanNotQuery(include, sfq);
    assertEquals(1, searcher.search(sfq, 10).totalHits);
    
    writer.close();
    reader.close();
    dir.close();
  }
}