Examples of org.apache.lucene.search.IndexSearcher.explain()

Class org.apache.lucene.search.IndexSearcher

Examples of org.apache.lucene.search.IndexSearcher.explain()

org.apache.lucene.search.IndexSearcher.explain()
Returns an Explanation that describes how doc scored against query.
This is intended to be used in developing Similarity implementations, and, for good performance, should not be displayed with every hit. Computing an explanation is as expensive as executing the query over the entire index.

    ScoreDoc sd[] = td.scoreDocs;
    for (int i=0; i<sd.length; i++) {
      float score = sd[i].score;
      String id = s.getIndexReader().document(sd[i].doc).get(ID_FIELD);
      log("-------- "+i+". Explain doc "+id);
      log(s.explain(q,sd[i].doc));
      float expectedScore =  N_DOCS-i;
      assertEquals("score of result "+i+" shuould be "+expectedScore+" != "+score, expectedScore, score, TEST_SCORE_TOLERANCE_DELTA);
      String expectedId =  inOrder 
        ? id2String(N_DOCS-i) // in-order ==> larger  values first 
        : id2String(i+1);     // reverse  ==> smaller values first

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          String docs = "";
          for (int i = 0; i < hits.scoreDocs.length; i++)
          {
            int docid = hits.scoreDocs[i].doc;
            float score = hits.scoreDocs[i].score;
            Explanation exp = searcher.explain(q, docid);
            Document doc = reader.document(docid);
            long uid = reader.getUID(docid);
            docs = docs + "UID: " + formatter.format(uid) + "\ndocid(in reader): " + formatter.format(docid) + "\nscore: " + score + "\n\n";
            docstr = docstr + "UID: " + formatter.format(uid) + "\ndocid(in reader): " + formatter.format(docid) + "\nscore: " + score + "\n" + doc + "\n" + exp + "\n\n";
          }

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    // test slop:
    query3.setSlop(1);
    result = searcher.search(query3, null, 1000).scoreDocs;


    // just make sure no exc:
    searcher.explain(query3, 0);


    assertEquals(3, result.length); // blueberry pizza, bluebird pizza, bluebird foobar pizza


    MultiPhraseQuery query4 = new MultiPhraseQuery();
    try {

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    ScoreDoc[] hits = searcher.search(q, null, 1000).scoreDocs;
    
    assertEquals("Wrong number of hits", 2, hits.length);
    
    // just make sure no exc:
    searcher.explain(q, 0);
    
    writer.close();
    searcher.close();
    reader.close();
    indexStore.close();

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    q.add(new Term[] {new Term("body", "nope"), new Term("body", "nope")});
    assertEquals("Wrong number of hits", 0,
        searcher.search(q, null, 1).totalHits);
    
    // just make sure no exc:
    searcher.explain(q, 0);
    
    writer.close();
    searcher.close();
    reader.close();
    indexStore.close();

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  public Explanation explain(Query query, int doc) throws CorruptIndexException, IOException, InterruptedException {
    IndexSearcher searcher = getIndexSearcher();
    _indexSearcherSemaphore.acquire();
    try {
      return searcher.explain(query, doc);
    } finally {
      _indexSearcherSemaphore.release();
    }
  }

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            : "IC";  // smaller than all ids of docs in this test ("ID0001", etc.)


    for (int i = 0; i < h.length; i++) {
      String resID = s.doc(h[i].doc).get(ID_FIELD);
      log(i + ".   score=" + h[i].score + "  -  " + resID);
      log(s.explain(q, h[i].doc));
      if (inOrder) {
        assertTrue("res id " + resID + " should be < prev res id " + prevID, resID.compareTo(prevID) < 0);
      } else {
        assertTrue("res id " + resID + " should be > prev res id " + prevID, resID.compareTo(prevID) > 0);
      }

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    ScoreDoc sd[] = td.scoreDocs;
    for (int i = 0; i < sd.length; i++) {
      float score = sd[i].score;
      String id = s.getIndexReader().document(sd[i].doc).get(ID_FIELD);
      log("-------- " + i + ". Explain doc " + id);
      log(s.explain(q, sd[i].doc));
      float expectedScore = N_DOCS - i - 1;
      assertEquals("score of result " + i + " shuould be " + expectedScore + " != " + score, expectedScore, score, TEST_SCORE_TOLERANCE_DELTA);
      String expectedId = inOrder
              ? id2String(N_DOCS - i) // in-order ==> larger  values first
              : id2String(i + 1);     // reverse  ==> smaller values first

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    // test slop:
    query3.setSlop(1);
    result = searcher.search(query3, null, 1000).scoreDocs;
    
    // just make sure no exc:
    searcher.explain(query3, 0);
    
    assertEquals(3, result.length); // blueberry pizza, bluebird pizza, bluebird
                                    // foobar pizza
    
    MultiPhraseQuery query4 = new MultiPhraseQuery();

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    ScoreDoc[] hits = searcher.search(q, null, 1000).scoreDocs;
    
    assertEquals("Wrong number of hits", 2, hits.length);
    
    // just make sure no exc:
    searcher.explain(q, 0);
    
    writer.close();
    reader.close();
    indexStore.close();
  }

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