Examples of org.apache.lucene.index.IndexReader

org.apache.lucene.index.IndexReader
IndexReader is an abstract class, providing an interface for accessing an index. Search of an index is done entirely through this abstract interface, so that any subclass which implements it is searchable.
Concrete subclasses of IndexReader are usually constructed with a call to one of the static open() methods, e.g. {@link #open(Directory,boolean)}.
For efficiency, in this API documents are often referred to via document numbers, non-negative integers which each name a unique document in the index. These document numbers are ephemeral--they may change as documents are added to and deleted from an index. Clients should thus not rely on a given document having the same number between sessions.
An IndexReader can be opened on a directory for which an IndexWriter is opened already, but it cannot be used to delete documents from the index then.
NOTE: for backwards API compatibility, several methods are not listed as abstract, but have no useful implementations in this base class and instead always throw UnsupportedOperationException. Subclasses are strongly encouraged to override these methods, but in many cases may not need to.

NOTE: as of 2.4, it's possible to open a read-only IndexReader using the static open methods that accept the boolean readOnly parameter. Such a reader has better concurrency as it's not necessary to synchronize on the isDeleted method. You must specify false if you want to make changes with the resulting IndexReader.

NOTE: {@link IndexReader} instances are completely threadsafe, meaning multiple threads can call any of its methods, concurrently. If your application requires external synchronization, you should not synchronize on the IndexReader instance; use your own (non-Lucene) objects instead.


    // now we should be able to open the index for write. 
    IndexWriter iw = new IndexWriter(benchmark.getRunData().getDirectory(),null,false,IndexWriter.MaxFieldLength.UNLIMITED);
    iw.close();


    IndexReader ir = IndexReader.open(benchmark.getRunData().getDirectory(), true);
    assertEquals(numLines + " lines were created but " + ir.numDocs() + " docs are in the index", numLines, ir.numDocs());
    ir.close();


    lineFile.delete();
  }

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        totalTokenCount1 += stat.getCount();
      }
    }


    // Separately count how many tokens are actually in the index:
    IndexReader reader = IndexReader.open(benchmark.getRunData().getDirectory(), true);
    assertEquals(NUM_DOCS, reader.numDocs());


    TermEnum terms = reader.terms();
    TermDocs termDocs = reader.termDocs();
    int totalTokenCount2 = 0;
    while(terms.next()) {
      termDocs.seek(terms.term());
      while(termDocs.next())
        totalTokenCount2 += termDocs.freq();
    }
    reader.close();


    // Make sure they are the same
    assertEquals(totalTokenCount1, totalTokenCount2);
  }

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    // 2. execute the algorithm  (required in every "logic" test)
    Benchmark benchmark = execBenchmark(algLines);


    // 3. test number of docs in the index
    IndexReader ir = IndexReader.open(benchmark.getRunData().getDirectory(), true);
    int ndocsExpected = 2 * 20; // Reuters20ContentSource exhausts after 20 docs.
    assertEquals("wrong number of docs in the index!", ndocsExpected, ir.numDocs());
    ir.close();
  }

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    // 2. execute the algorithm  (required in every "logic" test)
    Benchmark benchmark = execBenchmark(algLines);


    // 3. test number of docs in the index
    IndexReader ir = IndexReader.open(benchmark.getRunData().getDirectory(), true);
    int ndocsExpected = 20; // Reuters20ContentSource exhausts after 20 docs.
    assertEquals("wrong number of docs in the index!", ndocsExpected, ir.numDocs());
    ir.close();
  }

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    // 2. execute the algorithm  (required in every "logic" test)
    Benchmark benchmark = execBenchmark(algLines);


    // 3. test number of docs in the index
    IndexReader ir = IndexReader.open(benchmark.getRunData().getDirectory(), true);
    int ndocsExpected = 20; // Reuters20ContentSource exhausts after 20 docs.
    assertEquals("wrong number of docs in the index!", ndocsExpected, ir.numDocs());
    ir.close();
  }

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    assertTrue("did not use the specified MergeScheduler", ((MyMergeScheduler) benchmark.getRunData().getIndexWriter().getMergeScheduler()).called);
    benchmark.getRunData().getIndexWriter().close();


    // 3. test number of docs in the index
    IndexReader ir = IndexReader.open(benchmark.getRunData().getDirectory(), true);
    int ndocsExpected = 20; // Reuters20ContentSource exhausts after 20 docs.
    assertEquals("wrong number of docs in the index!", ndocsExpected, ir.numDocs());
    ir.close();
  }

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    Benchmark benchmark = execBenchmark(algLines);
    assertTrue("did not use the specified MergeScheduler", ((MyMergePolicy) benchmark.getRunData().getIndexWriter().getMergePolicy()).called);
    benchmark.getRunData().getIndexWriter().close();
    
    // 3. test number of docs in the index
    IndexReader ir = IndexReader.open(benchmark.getRunData().getDirectory(), true);
    int ndocsExpected = 20; // Reuters20ContentSource exhausts after 20 docs.
    assertEquals("wrong number of docs in the index!", ndocsExpected, ir.numDocs());
    ir.close();
  }

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    assertEquals(IndexWriter.DISABLE_AUTO_FLUSH, (int) writer.getRAMBufferSizeMB());
    assertEquals(3, writer.getMergeFactor());
    assertFalse(writer.getUseCompoundFile());
    writer.close();
    Directory dir = benchmark.getRunData().getDirectory();
    IndexReader reader = IndexReader.open(dir, true);
    TermFreqVector [] tfv = reader.getTermFreqVectors(0);
    assertNotNull(tfv);
    assertTrue(tfv.length > 0);
    reader.close();
  }

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    // 2. execute the algorithm  (required in every "logic" test)
    Benchmark benchmark = execBenchmark(algLines);


    // 3. test number of docs in the index
    IndexReader ir = IndexReader.open(benchmark.getRunData().getDirectory(), true);
    int ndocsExpected = 20; // Reuters20ContentSource exhausts after 20 docs.
    assertEquals("wrong number of docs in the index!", ndocsExpected, ir.numDocs());
    ir.close();


    // Make sure we have 3 segments:
    final String[] files = benchmark.getRunData().getDirectory().listAll();
    int cfsCount = 0;
    for(int i=0;i<files.length;i++)

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    IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(org.apache.lucene.util.Version.LUCENE_CURRENT), true, IndexWriter.MaxFieldLength.LIMITED);
    writer.addDocument(doc);
    writer.close();
    
    /** open a reader and fetch the document */ 
    IndexReader reader = IndexReader.open(dir, false);
    Document docFromReader = reader.document(0);
    assertTrue(docFromReader != null);
    
    /** fetch the binary stored field and compare it's content with the original one */
    String binaryFldStoredTest = new String(docFromReader.getBinaryValue("binaryStored"));
    assertTrue(binaryFldStoredTest.equals(binaryValStored));
    
    /** fetch the string field and compare it's content with the original one */
    String stringFldStoredTest = docFromReader.get("stringStored");
    assertTrue(stringFldStoredTest.equals(binaryValStored));
    
    /** delete the document from index */
    reader.deleteDocument(0);
    assertEquals(0, reader.numDocs());
    
    reader.close();
    dir.close();
  }

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