Class AnalyzerWrapper

Extension to Analyzer suitable for Analyzers which wrap other Analyzers.

GetWrappedAnalyzer(String) allows the Analyzer to wrap multiple Analyzers which are selected on a per field basis.

WrapComponents(String, TokenStreamComponents) allows the TokenStreamComponents of the wrapped Analyzer to then be wrapped (such as adding a new TokenFilter to form new TokenStreamComponents).

Inheritance
System.Object
Analyzer
AnalyzerWrapper
Inherited Members
Namespace: Lucene.Net.Analysis
Assembly: Lucene.Net.dll
Syntax
public abstract class AnalyzerWrapper : Analyzer

Constructors

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AnalyzerWrapper()

Creates a new AnalyzerWrapper. Since the ReuseStrategy of the wrapped Analyzers are unknown, PER_FIELD_REUSE_STRATEGY is assumed.

Declaration
protected AnalyzerWrapper()
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AnalyzerWrapper(ReuseStrategy)

Creates a new AnalyzerWrapper with the given reuse strategy.

If you want to wrap a single delegate Analyzer you can probably reuse its strategy when instantiating this subclass: base(innerAnalyzer.Strategy).

If you choose different analyzers per field, use PER_FIELD_REUSE_STRATEGY.

Declaration
protected AnalyzerWrapper(ReuseStrategy reuseStrategy)
Parameters
Type Name Description
ReuseStrategy reuseStrategy
See Also

Methods

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CreateComponents(String, TextReader)

Declaration
protected override sealed TokenStreamComponents CreateComponents(string fieldName, TextReader aReader)
Parameters
Type Name Description
System.String fieldName
TextReader aReader
Returns
Type Description
TokenStreamComponents
Overrides
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GetOffsetGap(String)

Declaration
public override int GetOffsetGap(string fieldName)
Parameters
Type Name Description
System.String fieldName
Returns
Type Description
System.Int32
Overrides
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GetPositionIncrementGap(String)

Declaration
public override int GetPositionIncrementGap(string fieldName)
Parameters
Type Name Description
System.String fieldName
Returns
Type Description
System.Int32
Overrides
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GetWrappedAnalyzer(String)

Retrieves the wrapped Analyzer appropriate for analyzing the field with the given name

Declaration
protected abstract Analyzer GetWrappedAnalyzer(string fieldName)
Parameters
Type Name Description
System.String fieldName

Name of the field which is to be analyzed

Returns
Type Description
Analyzer

Analyzer for the field with the given name. Assumed to be non-null

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InitReader(String, TextReader)

Declaration
protected override TextReader InitReader(string fieldName, TextReader reader)
Parameters
Type Name Description
System.String fieldName
TextReader reader
Returns
Type Description
TextReader
Overrides
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WrapComponents(String, TokenStreamComponents)

Wraps / alters the given TokenStreamComponents, taken from the wrapped Analyzer, to form new components. It is through this method that new TokenFilters can be added by AnalyzerWrappers. By default, the given components are returned.

Declaration
protected virtual TokenStreamComponents WrapComponents(string fieldName, TokenStreamComponents components)
Parameters
Type Name Description
System.String fieldName

Name of the field which is to be analyzed

TokenStreamComponents components TokenStreamComponents taken from the wrapped Analyzer
Returns
Type Description
TokenStreamComponents

Wrapped / altered TokenStreamComponents.

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WrapReader(String, TextReader)

Wraps / alters the given . Through this method AnalyzerWrappers can implement InitReader(String, TextReader). By default, the given reader is returned.

Declaration
protected virtual TextReader WrapReader(string fieldName, TextReader reader)
Parameters
Type Name Description
System.String fieldName

name of the field which is to be analyzed

TextReader reader

the reader to wrap

Returns
Type Description
TextReader

the wrapped reader