Examples of org.apache.lucene.document.StringField

org.apache.lucene.document.StringField
A field that is indexed but not tokenized: the entire String value is indexed as a single token. For example this might be used for a 'country' field or an 'id' field, or any field that you intend to use for sorting or access through the field cache.

    Directory dir = newDirectory();
    IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
    IndexWriter writer = new IndexWriter(dir, conf);
    
    Document doc = new Document();
    doc.add(new StringField("k1", "v1", Store.NO));
    doc.add(new StringField("k2", "v2", Store.NO));
    doc.add(new NumericDocValuesField("ndv", 5));
    writer.addDocument(doc); // flushed document
    writer.commit();
    writer.addDocument(doc); // in-memory document

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    for (int i = 0; i < numRounds; i++) {
      int numDocs = atLeast(5);
//      System.out.println("[" + Thread.currentThread().getName() + "]: round=" + i + ", numDocs=" + numDocs);
      for (int j = 0; j < numDocs; j++) {
        Document doc = new Document();
        doc.add(new StringField("id", "doc-" + docID, Store.NO));
        doc.add(new StringField("key", "all", Store.NO)); // update key
        // add all fields with their current value
        for (int f = 0; f < fieldValues.length; f++) {
          doc.add(new NumericDocValuesField("f" + f, fieldValues[f]));
        }
        writer.addDocument(doc);

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    conf.setMergePolicy(NoMergePolicy.COMPOUND_FILES);
    IndexWriter writer = new IndexWriter(dir, conf);
    
    // first segment with NDV
    Document doc = new Document();
    doc.add(new StringField("id", "doc0", Store.NO));
    doc.add(new NumericDocValuesField("ndv", 3));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new StringField("id", "doc4", Store.NO)); // document without 'ndv' field
    writer.addDocument(doc);
    writer.commit();
    
    // second segment with no NDV
    doc = new Document();
    doc.add(new StringField("id", "doc1", Store.NO));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new StringField("id", "doc2", Store.NO)); // document that isn't updated
    writer.addDocument(doc);
    writer.commit();
    
    // update document in the first segment - should not affect docsWithField of
    // the document without NDV field

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    conf.setMergePolicy(NoMergePolicy.COMPOUND_FILES);
    IndexWriter writer = new IndexWriter(dir, conf);
    
    // first segment with NDV
    Document doc = new Document();
    doc.add(new StringField("id", "doc0", Store.NO));
    doc.add(new StringField("ndv", "mock-value", Store.NO));
    doc.add(new NumericDocValuesField("ndv", 5));
    writer.addDocument(doc);
    writer.commit();
    
    // second segment with no NDV
    doc = new Document();
    doc.add(new StringField("id", "doc1", Store.NO));
    doc.add(new StringField("ndv", "mock-value", Store.NO));
    writer.addDocument(doc);
    writer.commit();
    
    // update document in the second segment
    writer.updateNumericDocValue(new Term("id", "doc1"), "ndv", 5L);

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    Directory dir = newDirectory();
    IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
    IndexWriter writer = new IndexWriter(dir, conf);
    
    Document doc = new Document();
    doc.add(new StringField("f", "mock-value", Store.NO));
    doc.add(new NumericDocValuesField("f", 5));
    writer.addDocument(doc);
    writer.commit();
    writer.updateNumericDocValue(new Term("f", "mock-value"), "f", 17L);
    writer.close();

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    IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
    conf.setCodec(oldCodecs[random().nextInt(oldCodecs.length)]);
    OLD_FORMAT_IMPERSONATION_IS_ACTIVE = true;
    IndexWriter writer = new IndexWriter(dir, conf);
    Document doc = new Document();
    doc.add(new StringField("id", "doc", Store.NO));
    doc.add(new NumericDocValuesField("f", 5));
    writer.addDocument(doc);
    writer.close();
    
    conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));

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    // create index
    final int numThreads = _TestUtil.nextInt(random(), 3, 6);
    final int numDocs = atLeast(2000);
    for (int i = 0; i < numDocs; i++) {
      Document doc = new Document();
      doc.add(new StringField("id", "doc" + i, Store.NO));
      double group = random().nextDouble();
      String g;
      if (group < 0.1) g = "g0";
      else if (group < 0.5) g = "g1";
      else if (group < 0.8) g = "g2";
      else g = "g3";
      doc.add(new StringField("updKey", g, Store.NO));
      for (int j = 0; j < numThreads; j++) {
        long value = random().nextInt();
        doc.add(new NumericDocValuesField("f" + j, value));
        doc.add(new NumericDocValuesField("cf" + j, value * 2)); // control, always updated to f * 2
      }

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    conf.setMaxBufferedDocs(4);
    IndexWriter writer = new IndexWriter(dir, conf);
    final int numDocs = atLeast(10);
    for (int i = 0; i < numDocs; i++) {
      Document doc = new Document();
      doc.add(new StringField("id", "doc" + i, Store.NO));
      long value = random().nextInt();
      doc.add(new NumericDocValuesField("f", value));
      doc.add(new NumericDocValuesField("cf", value * 2));
      writer.addDocument(doc);
    }

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        return new Lucene45DocValuesFormat();
      }
    });
    IndexWriter writer = new IndexWriter(dir, conf.clone());
    Document doc = new Document();
    doc.add(new StringField("id", "d0", Store.NO));
    doc.add(new NumericDocValuesField("f1", 5L));
    doc.add(new NumericDocValuesField("f2", 13L));
    writer.addDocument(doc);
    writer.close();
    
    // change format
    conf.setCodec(new Lucene46Codec() {
      @Override
      public DocValuesFormat getDocValuesFormatForField(String field) {
        return new AssertingDocValuesFormat();
      }
    });
    writer = new IndexWriter(dir, conf.clone());
    doc = new Document();
    doc.add(new StringField("id", "d1", Store.NO));
    doc.add(new NumericDocValuesField("f1", 17L));
    doc.add(new NumericDocValuesField("f2", 2L));
    writer.addDocument(doc);
    writer.updateNumericDocValue(new Term("id", "d0"), "f1", 12L);
    writer.close();

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    }


    // create first index
    for (int i = 0; i < numDocs; i++) {
      Document doc = new Document();
      doc.add(new StringField("id", RandomPicks.randomFrom(random(), randomTerms), Store.NO));
      doc.add(new NumericDocValuesField("ndv", 4L));
      doc.add(new NumericDocValuesField("control", 8L));
      writer.addDocument(doc);
    }

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