Examples of org.apache.lucene.search.IndexSearcher

org.apache.lucene.search.IndexSearcher
Implements search over a single IndexReader.
Applications usually need only call the inherited {@link #search(Query,int)}or {@link #search(Query,Filter,int)} methods. Forperformance reasons, if your index is unchanging, you should share a single IndexSearcher instance across multiple searches instead of creating a new one per-search. If your index has changed and you wish to see the changes reflected in searching, you should use {@link IndexReader#openIfChanged} to obtain a new reader andthen create a new IndexSearcher from that. Also, for low-latency turnaround it's best to use a near-real-time reader ( {@link IndexReader#open(IndexWriter,boolean)}). Once you have a new {@link IndexReader}, it's relatively cheap to create a new IndexSearcher from it.
NOTE: {@link IndexSearcher} instances are completely thread safe, meaning multiple threads can call any of its methods, concurrently. If your application requires external synchronization, you should not synchronize on the IndexSearcher instance; use your own (non-Lucene) objects instead.

    Judge judge = new TrecJudge(new BufferedReader(new FileReader(qrelsFile)));
    
    // validate topics & judgments match each other
    judge.validateData(qqs, logger);
    
    IndexSearcher searcher = new IndexSearcher(FSDirectory.open(new File(workDir,"index")), true);


    QualityQueryParser qqParser = new SimpleQQParser("title","body");
    QualityBenchmark qrun = new QualityBenchmark(qqs, qqParser, searcher, docNameField);
    
    SubmissionReport submitLog = DEBUG ? new SubmissionReport(logger, "TestRun") : null;

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        Field.Index.ANALYZED));
    iwriter.addDocument(doc);
    iwriter.close();
    
    // Now search the index:
    IndexSearcher isearcher = new IndexSearcher(directory, true); // read-only=true
    // Parse a simple query that searches for "text":
    QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "fieldname", analyzer);
    Query query = parser.parse("text");
    ScoreDoc[] hits = isearcher.search(query, null, 1000).scoreDocs;
    assertEquals(1, hits.length);
    // Iterate through the results:
    for (int i = 0; i < hits.length; i++) {
      Document hitDoc = isearcher.doc(hits[i].doc);
      assertEquals("This is the text to be indexed.", hitDoc.get("fieldname"));
    }
    isearcher.close();
    directory.close();
    
  }

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      System.out.println(
                 "java org.apache.lucene.wordnet.SynExpand <index path> <query>");
    }


    FSDirectory directory = FSDirectory.open(new File(args[0]));
    IndexSearcher searcher = new IndexSearcher(directory, true);


    String query = args[1];
    String field = "contents";


    Query q = expand( query, searcher, new StandardAnalyzer(Version.LUCENE_CURRENT), field, 0.9f);
    System.out.println( "Query: " + q.toString( field));






    searcher.close();
    directory.close();
  }

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      System.out.println(
                 "java org.apache.lucene.wordnet.SynLookup <index path> <word>");
    }


    FSDirectory directory = FSDirectory.open(new File(args[0]));
    IndexSearcher searcher = new IndexSearcher(directory, true);


    String word = args[1];
    Query query = new TermQuery(new Term(Syns2Index.F_WORD, word));
    CountingCollector countingCollector = new CountingCollector();
    searcher.search(query, countingCollector);


    if (countingCollector.numHits == 0) {
      System.out.println("No synonyms found for " + word);
    } else {
      System.out.println("Synonyms found for \"" + word + "\":");
    }


    ScoreDoc[] hits = searcher.search(query, countingCollector.numHits).scoreDocs;
    
    for (int i = 0; i < hits.length; i++) {
      Document doc = searcher.doc(hits[i].doc);


      String[] values = doc.getValues(Syns2Index.F_SYN);


      for (int j = 0; j < values.length; j++) {
        System.out.println(values[j]);
      }
    }


    searcher.close();
    directory.close();
  }

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  public void testQueryScorerHits() throws Exception {
    Analyzer analyzer = new SimpleAnalyzer();
    QueryParser qp = new QueryParser(TEST_VERSION, FIELD_NAME, analyzer);
    query = qp.parse("\"very long\"");
    searcher = new IndexSearcher(ramDir, true);
    TopDocs hits = searcher.search(query, 10);
    
    QueryScorer scorer = new QueryScorer(query, FIELD_NAME);
    Highlighter highlighter = new Highlighter(scorer);

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  }
  
  public void testSpanRegexQuery() throws Exception {
    query = new SpanOrQuery(new SpanQuery [] {
        new SpanRegexQuery(new Term(FIELD_NAME, "ken.*")) });
    searcher = new IndexSearcher(ramDir, true);
    hits = searcher.search(query, 100);
    int maxNumFragmentsRequired = 2;


    QueryScorer scorer = new QueryScorer(query, FIELD_NAME);
    Highlighter highlighter = new Highlighter(this, scorer);

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        numHighlights == 5);
  }
  
  public void testRegexQuery() throws Exception {
    query = new RegexQuery(new Term(FIELD_NAME, "ken.*"));
    searcher = new IndexSearcher(ramDir, true);
    hits = searcher.search(query, 100);
    int maxNumFragmentsRequired = 2;


    QueryScorer scorer = new QueryScorer(query, FIELD_NAME);
    Highlighter highlighter = new Highlighter(this, scorer);

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  }
  
  public void testNumericRangeQuery() throws Exception {
    // doesn't currently highlight, but make sure it doesn't cause exception either
    query = NumericRangeQuery.newIntRange(NUMERIC_FIELD_NAME, 2, 6, true, true);
    searcher = new IndexSearcher(ramDir, true);
    hits = searcher.search(query, 100);
    int maxNumFragmentsRequired = 2;


    QueryScorer scorer = new QueryScorer(query, FIELD_NAME);
    Highlighter highlighter = new Highlighter(this, scorer);

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    numHighlights = 0;


    query = new WildcardQuery(new Term(FIELD_NAME, "ken*"));
    ((WildcardQuery)query).setRewriteMethod(MultiTermQuery.CONSTANT_SCORE_FILTER_REWRITE);
    searcher = new IndexSearcher(ramDir, true);
    // can't rewrite ConstantScore if you want to highlight it -
    // it rewrites to ConstantScoreQuery which cannot be highlighted
    // query = unReWrittenQuery.rewrite(reader);
    System.out.println("Searching for: " + query.toString(FIELD_NAME));
    hits = searcher.search(query, null, 1000);

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      @Override
      public void run() throws Exception {
        numHighlights = 0;
        // test to show how rewritten query can still be used
        searcher = new IndexSearcher(ramDir, true);
        Analyzer analyzer = new StandardAnalyzer(TEST_VERSION);


        QueryParser parser = new QueryParser(TEST_VERSION, FIELD_NAME, analyzer);
        Query query = parser.parse("JF? or Kenned*");
        System.out.println("Searching with primitive query");

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