Examples of org.apache.lucene.index.IndexReader.deleteDocument()

Class org.apache.lucene.index.IndexReader

Examples of org.apache.lucene.index.IndexReader.deleteDocument()

org.apache.lucene.index.IndexReader.deleteDocument()
Deletes the document numbered docNum. Once a document is deleted it will not appear in TermDocs or TermPostitions enumerations. Attempts to read its field with the {@link #document}method will result in an error. The presence of this document may still be reflected in the {@link #docFreq} statistic, thoughthis will be corrected eventually as the index is further modified. @throws StaleReaderException if the index has changedsince this reader was opened @throws CorruptIndexException if the index is corrupt @throws LockObtainFailedException if another writerhas this index open (write.lock could not be obtained) @throws IOException if there is a low-level IO error

        IndexReader reader = IndexReader.open(dir);
        Term aaa = new Term("content", "aaa");
        Term bbb = new Term("content", "bbb");
        Term ccc = new Term("content", "ccc");
        assertEquals(reader.docFreq(ccc), 37);
        reader.deleteDocument(0);
        assertEquals(reader.docFreq(aaa), 37);
        dir.tweakBufferSizes();
        reader.deleteDocument(4);
        assertEquals(reader.docFreq(bbb), 37);
        dir.tweakBufferSizes();

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        Term ccc = new Term("content", "ccc");
        assertEquals(reader.docFreq(ccc), 37);
        reader.deleteDocument(0);
        assertEquals(reader.docFreq(aaa), 37);
        dir.tweakBufferSizes();
        reader.deleteDocument(4);
        assertEquals(reader.docFreq(bbb), 37);
        dir.tweakBufferSizes();


        IndexSearcher searcher = new IndexSearcher(reader);
        Hits hits = searcher.search(new TermQuery(bbb));

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    setUpDirs(dir, aux);


    IndexReader reader = IndexReader.open(aux);
    for (int i = 0; i < 20; i++) {
      reader.deleteDocument(i);
    }
    assertEquals(10, reader.numDocs());
    reader.close();


    IndexWriter writer = newWriter(dir, false);

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    assertEquals(3, writer.getSegmentCount());
    writer.close();


    IndexReader reader = IndexReader.open(aux);
    for (int i = 0; i < 27; i++) {
      reader.deleteDocument(i);
    }
    assertEquals(3, reader.numDocs());
    reader.close();


    reader = IndexReader.open(aux2);

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    assertEquals(3, reader.numDocs());
    reader.close();


    reader = IndexReader.open(aux2);
    for (int i = 0; i < 8; i++) {
      reader.deleteDocument(i);
    }
    assertEquals(22, reader.numDocs());
    reader.close();


    writer = newWriter(dir, false);

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        writer.close();


        // delete 40 documents
        reader = IndexReader.open(dir);
        for (i = 0; i < 40; i++) {
            reader.deleteDocument(i);
        }
        reader.close();


        // test doc count before segments are merged/index is optimized
        writer = new IndexWriter(dir, new WhitespaceAnalyzer(), false);

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    /** fetch the compressed string field and compare it's content with the original one */
    String stringFldCompressedTest = new String(docFromReader.get("stringCompressed"));
    assertTrue(stringFldCompressedTest.equals(binaryValCompressed));
    
    /** delete the document from index */
    reader.deleteDocument(0);
    assertEquals(0, reader.numDocs());
    
    reader.close();
    
  }

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    Hits hits = searcher.search(q);
    log("Got "+hits.length()+" results");
    assertEquals("must match all "+N+" docs, not only "+hits.length()+" docs!",N,hits.length());
    if (deleteInFront) {
      log("deleting hits that was not yet retrieved!");
      reader.deleteDocument(reader.maxDoc()-1);
      reader.deleteDocument(reader.maxDoc()-2);
      reader.deleteDocument(reader.maxDoc()-3);
    }
    try {
      for (int i = 0; i < hits.length(); i++) {

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    log("Got "+hits.length()+" results");
    assertEquals("must match all "+N+" docs, not only "+hits.length()+" docs!",N,hits.length());
    if (deleteInFront) {
      log("deleting hits that was not yet retrieved!");
      reader.deleteDocument(reader.maxDoc()-1);
      reader.deleteDocument(reader.maxDoc()-2);
      reader.deleteDocument(reader.maxDoc()-3);
    }
    try {
      for (int i = 0; i < hits.length(); i++) {
        int id = hits.id(i);

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    assertEquals("must match all "+N+" docs, not only "+hits.length()+" docs!",N,hits.length());
    if (deleteInFront) {
      log("deleting hits that was not yet retrieved!");
      reader.deleteDocument(reader.maxDoc()-1);
      reader.deleteDocument(reader.maxDoc()-2);
      reader.deleteDocument(reader.maxDoc()-3);
    }
    try {
      for (int i = 0; i < hits.length(); i++) {
        int id = hits.id(i);
        assertEquals("Hit "+i+" has doc id "+hits.id(i)+" instead of "+i,i,hits.id(i));

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