Class NumericTokenStream

Expert: this class provides a TokenStream for indexing numeric values that can be used by NumericRangeQuery or NumericRangeFilter.

Note that for simple usage, Int32Field, Int64Field, SingleField or DoubleField is recommended. These fields disable norms and term freqs, as they are not usually needed during searching. If you need to change these settings, you should use this class.

Here's an example usage, for an field:

    IndexableFieldType fieldType = new IndexableFieldType(TextField.TYPE_NOT_STORED)
    {
        OmitNorms = true,
        IndexOptions = IndexOptions.DOCS_ONLY
    };
    Field field = new Field(name, new NumericTokenStream(precisionStep).SetInt32Value(value), fieldType);
    document.Add(field);

For optimal performance, re-use the TokenStream and Field instance for more than one document:

    NumericTokenStream stream = new NumericTokenStream(precisionStep);
    IndexableFieldType fieldType = new IndexableFieldType(TextField.TYPE_NOT_STORED)
    {
        OmitNorms = true,
        IndexOptions = IndexOptions.DOCS_ONLY
    };
    Field field = new Field(name, stream, fieldType);
    Document document = new Document();
    document.Add(field);

    for(all documents) 
    {
        stream.SetInt32Value(value)
        writer.AddDocument(document);
    }

this stream is not intended to be used in analyzers; it's more for iterating the different precisions during indexing a specific numeric value.

NOTE: as token streams are only consumed once the document is added to the index, if you index more than one numeric field, use a separate NumericTokenStream instance for each.

See NumericRangeQuery for more details on the precisionStep parameter as well as how numeric fields work under the hood.

@since 2.9