Examples of org.apache.lucene.document.FloatDocValuesField

org.apache.lucene.document.FloatDocValuesField
Syntactic sugar for encoding floats as NumericDocValues via {@link Float#floatToRawIntBits(float)}.
Per-document floating point values can be retrieved via {@link FieldCache#getFloats(AtomicReader,String,boolean)}.
NOTE: In most all cases this will be rather inefficient, requiring four bytes per document. Consider encoding floating point values yourself with only as much precision as you require.

      fields.add(newStringField("bytesval", TestUtil.randomRealisticUnicodeString(random()), Field.Store.NO));
      fields.add(new DoubleField("double", random().nextDouble(), Field.Store.NO));


      if (supportsDocValues) {
        fields.add(new NumericDocValuesField("intdocvalues", random().nextInt()));
        fields.add(new FloatDocValuesField("floatdocvalues", random().nextFloat()));
        fields.add(new SortedDocValuesField("sortedbytesdocvalues", new BytesRef(TestUtil.randomRealisticUnicodeString(random()))));
        fields.add(new SortedDocValuesField("sortedbytesdocvaluesval", new BytesRef(TestUtil.randomRealisticUnicodeString(random()))));
        fields.add(new BinaryDocValuesField("straightbytesdocvalues", new BytesRef(TestUtil.randomRealisticUnicodeString(random()))));
      }
      Document document = new Document();

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    doc.add(new SortedDocValuesField("dvBytesSortedFixed", ref));
    doc.add(new SortedDocValuesField("dvBytesSortedVar", ref));
    doc.add(new BinaryDocValuesField("dvBytesStraightFixed", ref));
    doc.add(new BinaryDocValuesField("dvBytesStraightVar", ref));
    doc.add(new DoubleDocValuesField("dvDouble", (double)id));
    doc.add(new FloatDocValuesField("dvFloat", (float)id));
    doc.add(new NumericDocValuesField("dvInt", id));
    doc.add(new NumericDocValuesField("dvLong", id));
    doc.add(new NumericDocValuesField("dvPacked", id));
    doc.add(new NumericDocValuesField("dvShort", (short)id));
    // a field with both offsets and term vectors for a cross-check

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    Directory dir = newDirectory();
    RandomIndexWriter iw = new RandomIndexWriter(random(), dir);
    Document doc = new Document();
    Field field = newTextField("foo", "", Field.Store.NO);
    doc.add(field);
    Field dvField = new FloatDocValuesField("foo_boost", 0.0F);
    doc.add(dvField);
    Field field2 = newTextField("bar", "", Field.Store.NO);
    doc.add(field2);
    
    field.setStringValue("quick brown fox");
    field2.setStringValue("quick brown fox");
    dvField.setFloatValue(2f); // boost x2
    iw.addDocument(doc);
    field.setStringValue("jumps over lazy brown dog");
    field2.setStringValue("jumps over lazy brown dog");
    dvField.setFloatValue(4f); // boost x4
    iw.addDocument(doc);
    IndexReader ir = iw.getReader();
    iw.close();
    
    // no boosting

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      document.add(new FloatField("float", random().nextFloat(), Field.Store.NO));
      document.add(new DoubleField("double", random().nextDouble(), Field.Store.NO));


      document.add(new NumericDocValuesField("intdocvalues", random().nextInt()));
      document.add(new FloatDocValuesField("floatdocvalues", random().nextFloat()));
      iw.addDocument(document);
    }
    reader = iw.getReader();
    iw.close();
    searcher = newSearcher(reader);

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  /** Tests sorting on type float */
  public void testFloat() throws IOException {
    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
    Document doc = new Document();
    doc.add(new FloatDocValuesField("value", 30.1F));
    doc.add(newStringField("value", "30.1", Field.Store.YES));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new FloatDocValuesField("value", -1.3F));
    doc.add(newStringField("value", "-1.3", Field.Store.YES));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new FloatDocValuesField("value", 4.2F));
    doc.add(newStringField("value", "4.2", Field.Store.YES));
    writer.addDocument(doc);
    IndexReader ir = writer.getReader();
    writer.close();

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  /** Tests sorting on type float in reverse */
  public void testFloatReverse() throws IOException {
    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
    Document doc = new Document();
    doc.add(new FloatDocValuesField("value", 30.1F));
    doc.add(newStringField("value", "30.1", Field.Store.YES));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new FloatDocValuesField("value", -1.3F));
    doc.add(newStringField("value", "-1.3", Field.Store.YES));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new FloatDocValuesField("value", 4.2F));
    doc.add(newStringField("value", "4.2", Field.Store.YES));
    writer.addDocument(doc);
    IndexReader ir = writer.getReader();
    writer.close();

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    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
    Document doc = new Document();
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new FloatDocValuesField("value", -1.3F));
    doc.add(newStringField("value", "-1.3", Field.Store.YES));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new FloatDocValuesField("value", 4.2F));
    doc.add(newStringField("value", "4.2", Field.Store.YES));
    writer.addDocument(doc);
    IndexReader ir = writer.getReader();
    writer.close();

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    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
    Document doc = new Document();
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new FloatDocValuesField("value", -1.3F));
    doc.add(newStringField("value", "-1.3", Field.Store.YES));
    writer.addDocument(doc);
    doc = new Document();
    doc.add(new FloatDocValuesField("value", 4.2F));
    doc.add(newStringField("value", "4.2", Field.Store.YES));
    writer.addDocument(doc);
    IndexReader ir = writer.getReader();
    writer.close();

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    RandomIndexWriter iwriter = new RandomIndexWriter(random(), directory);
    Document doc = new Document();
    String longTerm = "longtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongtermlongterm";
    String text = "This is the text to be indexed. " + longTerm;
    doc.add(newTextField("fieldname", text, Field.Store.YES));
    doc.add(new FloatDocValuesField("dv", 5.7f));
    iwriter.addDocument(doc);
    iwriter.close();
    
    // Now search the index:
    IndexReader ireader = DirectoryReader.open(directory); // read-only=true

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