Class PerFieldAnalyzerWrapper

This analyzer is used to facilitate scenarios where different fields Require different analysis techniques. Use the Map argument in PerFieldAnalyzerWrapper(Analyzer, IDictionary<string, Analyzer>) to add non-default analyzers for fields.

Example usage: 

IDictionary<string, Analyzer> analyzerPerField = new Dictionary<string, Analyzer>();
analyzerPerField["firstname"] = new KeywordAnalyzer();
analyzerPerField["lastname"] = new KeywordAnalyzer();

PerFieldAnalyzerWrapper aWrapper =
  new PerFieldAnalyzerWrapper(new StandardAnalyzer(version), analyzerPerField);

In this example, StandardAnalyzer will be used for all fields except "firstname" and "lastname", for which KeywordAnalyzer will be used.

A PerFieldAnalyzerWrapper can be used like any other analyzer, for both indexing and query parsing.

Inheritance
object
Analyzer
AnalyzerWrapper
PerFieldAnalyzerWrapper
Implements
Inherited Members
Analyzer.Strategy
Analyzer.Dispose()
Analyzer.GLOBAL_REUSE_STRATEGY
Analyzer.PER_FIELD_REUSE_STRATEGY
Namespace: Lucene.Net.Analysis.Miscellaneous
Assembly: Lucene.Net.Analysis.Common.dll
Syntax
public sealed class PerFieldAnalyzerWrapper : AnalyzerWrapper, IDisposable

Constructors

PerFieldAnalyzerWrapper(Analyzer)

Constructs with default analyzer.

Declaration
public PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer)
Parameters
Type Name Description
Analyzer defaultAnalyzer

Any fields not specifically defined to use a different analyzer will use the one provided here.

PerFieldAnalyzerWrapper(Analyzer, IDictionary<string, Analyzer>)

Constructs with default analyzer and a map of analyzers to use for specific fields.

The type of IDictionary<TKey, TValue> supplied will determine the type of behavior.
Dictionary<TKey, TValue>General use. null keys are not supported.
SortedDictionary<TKey, TValue>Use when sorted keys are required. null keys are not supported.
J2N.Collections.Generic.Dictionary<TKey, TValue>Similar behavior as Dictionary<TKey, TValue>. null keys are supported.
J2N.Collections.Generic.SortedDictionary<TKey, TValue>Use when sorted keys are required. null keys are supported.
J2N.Collections.Generic.LinkedDictionary<TKey, TValue>Use when insertion order must be preserved (Dictionary<TKey, TValue> preserves insertion order only until items are removed). null keys are supported.
Or, use a 3rd party or custom IDictionary<TKey, TValue> if other behavior is desired.
Declaration
public PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer, IDictionary<string, Analyzer> fieldAnalyzers)
Parameters
Type Name Description
Analyzer defaultAnalyzer

Any fields not specifically defined to use a different analyzer will use the one provided here.
IDictionary<string, Analyzer> fieldAnalyzers

A IDictionary<TKey, TValue> (String field name to the Analyzer) to be used for those fields.

Methods

GetWrappedAnalyzer(string)

Retrieves the wrapped Lucene.Net.Analysis.Analyzer appropriate for analyzing the field with the given name

Declaration
protected override Analyzer GetWrappedAnalyzer(string fieldName)
Parameters
Type Name Description
string fieldName

Name of the field which is to be analyzed
Returns
Type Description
Analyzer

Lucene.Net.Analysis.Analyzer for the field with the given name. Assumed to be non-null
Overrides

ToString()

Returns a string that represents the current object.

Declaration
public override string ToString()
Returns
Type Description
string

A string that represents the current object.
Overrides

Implements