Expert: This class provides a {@link TokenStream}
for indexing numeric values that can be used by {@link
NumericRangeQuery} or {@link NumericRangeFilter}.
Note that for simple usage, {@link NumericField} is
recommended. {@link NumericField} disables norms and
term freqs, as they are not usually needed during
searching. If you need to change these settings, you
should use this class.
See {@link NumericField} for capabilities of fields
indexed numerically.Here's an example usage, for an field:
instance for each.See {@link NumericRangeQuery} for more details on the
parameter as well as how numeric fields work under the hood.NOTE: This API is experimental and
might change in incompatible ways in the next release.
Namespace: Lucene.Net.AnalysisCopyC#
int
Field field = new Field(name, new NumericTokenStream(precisionStep).setIntValue(value)); field.setOmitNorms(true); field.setOmitTermFreqAndPositions(true); document.add(field);For optimal performance, re-use the TokenStream and Field instance for more than one document:
NumericTokenStream stream = new NumericTokenStream(precisionStep); Field field = new Field(name, stream); field.setOmitNorms(true); field.setOmitTermFreqAndPositions(true); Document document = new Document(); document.add(field); for(all documents) { stream.setIntValue(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
CopyC#
NumericTokenStream
CopyC#
precisionStep
Assembly: Lucene.Net (in Lucene.Net.dll) Version: 2.9.4.1
Syntax
C# |
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public sealed class NumericTokenStream : TokenStream |
Visual Basic |
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Public NotInheritable Class NumericTokenStream _ Inherits TokenStream |
Visual C++ |
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public ref class NumericTokenStream sealed : public TokenStream |
Inheritance Hierarchy
System..::..Object
Lucene.Net.Util..::..AttributeSource
Lucene.Net.Analysis..::..TokenStream
Lucene.Net.Analysis..::..NumericTokenStream
Lucene.Net.Util..::..AttributeSource
Lucene.Net.Analysis..::..TokenStream
Lucene.Net.Analysis..::..NumericTokenStream