Class FastVectorHighlighter

Another highlighter implementation.

Inheritance

System.Object

FastVectorHighlighter

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: Lucene.Net.Search.VectorHighlight

Assembly: Lucene.Net.Highlighter.dll

Syntax

public class FastVectorHighlighter

Constructors

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FastVectorHighlighter()

the default constructor.

Declaration

public FastVectorHighlighter()

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FastVectorHighlighter(Boolean, Boolean)

a constructor. Using SimpleFragListBuilder and ScoreOrderFragmentsBuilder.

Declaration

public FastVectorHighlighter(bool phraseHighlight, bool fieldMatch)

Parameters

Type	Name	Description
System.Boolean	phraseHighlight	true or false for phrase highlighting
System.Boolean	fieldMatch	true of false for field matching

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FastVectorHighlighter(Boolean, Boolean, IFragListBuilder, IFragmentsBuilder)

a constructor. A IFragListBuilder and a IFragmentsBuilder can be specified (plugins).

Declaration

public FastVectorHighlighter(bool phraseHighlight, bool fieldMatch, IFragListBuilder fragListBuilder, IFragmentsBuilder fragmentsBuilder)

Parameters

Type	Name	Description
System.Boolean	phraseHighlight	true of false for phrase highlighting
System.Boolean	fieldMatch	true of false for field matching
IFragListBuilder	fragListBuilder	an instance of IFragmentsBuilder
IFragmentsBuilder	fragmentsBuilder	an instance of IFragmentsBuilder

Fields

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DEFAULT_FIELD_MATCH

Declaration

public static readonly bool DEFAULT_FIELD_MATCH

Field Value

Type	Description
System.Boolean

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DEFAULT_PHRASE_HIGHLIGHT

Declaration

public static readonly bool DEFAULT_PHRASE_HIGHLIGHT

Field Value

Type	Description
System.Boolean

Properties

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IsFieldMatch

return whether fieldMatch or not.

Declaration

public virtual bool IsFieldMatch { get; }

Property Value

Type	Description
System.Boolean

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IsPhraseHighlight

return whether phraseHighlight or not.

Declaration

public virtual bool IsPhraseHighlight { get; }

Property Value

Type	Description
System.Boolean

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PhraseLimit

Gets or Sets the maximum number of phrases to analyze when searching for the highest-scoring phrase. The default is unlimited (int.MaxValue).

Declaration

public virtual int PhraseLimit { get; set; }

Property Value

Type	Description
System.Int32

Methods

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GetBestFragment(FieldQuery, IndexReader, Int32, String, Int32)

return the best fragment.

Declaration

public string GetBestFragment(FieldQuery fieldQuery, IndexReader reader, int docId, string fieldName, int fragCharSize)

Parameters

Type	Name	Description
FieldQuery	fieldQuery	FieldQuery object
Lucene.Net.Index.IndexReader	reader	Lucene.Net.Index.IndexReader of the index
System.Int32	docId	document id to be highlighted
System.String	fieldName	field of the document to be highlighted
System.Int32	fragCharSize	the length (number of chars) of a fragment

Returns

Type	Description
System.String	the best fragment (snippet) string

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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GetBestFragment(FieldQuery, IndexReader, Int32, String, Int32, IFragListBuilder, IFragmentsBuilder, String[], String[], IEncoder)

return the best fragment.

Declaration

public string GetBestFragment(FieldQuery fieldQuery, IndexReader reader, int docId, string fieldName, int fragCharSize, IFragListBuilder fragListBuilder, IFragmentsBuilder fragmentsBuilder, string[] preTags, string[] postTags, IEncoder encoder)

Parameters

Type	Name	Description
FieldQuery	fieldQuery	FieldQuery object
Lucene.Net.Index.IndexReader	reader	Lucene.Net.Index.IndexReader of the index
System.Int32	docId	document id to be highlighted
System.String	fieldName	field of the document to be highlighted
System.Int32	fragCharSize	the length (number of chars) of a fragment
IFragListBuilder	fragListBuilder	IFragListBuilder object
IFragmentsBuilder	fragmentsBuilder	IFragmentsBuilder object
System.String[]	preTags	pre-tags to be used to highlight terms
System.String[]	postTags	post-tags to be used to highlight terms
IEncoder	encoder	an encoder that generates encoded text

Returns

Type	Description
System.String	the best fragment (snippet) string

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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GetBestFragments(FieldQuery, IndexReader, Int32, String, ISet<String>, Int32, Int32, IFragListBuilder, IFragmentsBuilder, String[], String[], IEncoder)

Return the best fragments. Matches are scanned from matchedFields and turned into fragments against storedField. The highlighting may not make sense if matchedFields has matches with offsets that don't correspond features in storedField. It will outright throw a System.IndexOutOfRangeException if matchedFields produces offsets outside of storedField. As such it is advisable that all matchedFields share the same source as storedField or are at least a prefix of it.

Declaration

public string[] GetBestFragments(FieldQuery fieldQuery, IndexReader reader, int docId, string storedField, ISet<string> matchedFields, int fragCharSize, int maxNumFragments, IFragListBuilder fragListBuilder, IFragmentsBuilder fragmentsBuilder, string[] preTags, string[] postTags, IEncoder encoder)

Parameters

Type	Name	Description
FieldQuery	fieldQuery	FieldQuery object
Lucene.Net.Index.IndexReader	reader	Lucene.Net.Index.IndexReader of the index
System.Int32	docId	document id to be highlighted
System.String	storedField	field of the document that stores the text
System.Collections.Generic.ISet<System.String>	matchedFields	fields of the document to scan for matches
System.Int32	fragCharSize	the length (number of chars) of a fragment
System.Int32	maxNumFragments	maximum number of fragments
IFragListBuilder	fragListBuilder	IFragListBuilder object
IFragmentsBuilder	fragmentsBuilder	IFragmentsBuilder object
System.String[]	preTags	pre-tags to be used to highlight terms
System.String[]	postTags	post-tags to be used to highlight terms
IEncoder	encoder	an encoder that generates encoded text

Returns

Type	Description
System.String[]	created fragments or null when no fragments created. size of the array can be less than `maxNumFragments`

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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GetBestFragments(FieldQuery, IndexReader, Int32, String, Int32, Int32)

return the best fragments.

Declaration

public string[] GetBestFragments(FieldQuery fieldQuery, IndexReader reader, int docId, string fieldName, int fragCharSize, int maxNumFragments)

Parameters

Type	Name	Description
FieldQuery	fieldQuery	FieldQuery object
Lucene.Net.Index.IndexReader	reader	Lucene.Net.Index.IndexReader of the index
System.Int32	docId	document id to be highlighted
System.String	fieldName	field of the document to be highlighted
System.Int32	fragCharSize	the length (number of chars) of a fragment
System.Int32	maxNumFragments	maximum number of fragments

Returns

Type	Description
System.String[]	created fragments or null when no fragments created. size of the array can be less than maxNumFragments

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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GetBestFragments(FieldQuery, IndexReader, Int32, String, Int32, Int32, IFragListBuilder, IFragmentsBuilder, String[], String[], IEncoder)

return the best fragments.

Declaration

public string[] GetBestFragments(FieldQuery fieldQuery, IndexReader reader, int docId, string fieldName, int fragCharSize, int maxNumFragments, IFragListBuilder fragListBuilder, IFragmentsBuilder fragmentsBuilder, string[] preTags, string[] postTags, IEncoder encoder)

Parameters

Type	Name	Description
FieldQuery	fieldQuery	FieldQuery object
Lucene.Net.Index.IndexReader	reader	Lucene.Net.Index.IndexReader of the index
System.Int32	docId	document id to be highlighted
System.String	fieldName	field of the document to be highlighted
System.Int32	fragCharSize	the length (number of chars) of a fragment
System.Int32	maxNumFragments	maximum number of fragments
IFragListBuilder	fragListBuilder	IFragListBuilder object
IFragmentsBuilder	fragmentsBuilder	IFragmentsBuilder object
System.String[]	preTags	pre-tags to be used to highlight terms
System.String[]	postTags	post-tags to be used to highlight terms
IEncoder	encoder	an encoder that generates encoded text

Returns

Type	Description
System.String[]	created fragments or null when no fragments created. size of the array can be less than maxNumFragments

Exceptions

Type	Condition
System.IO.IOException	If there is a low-level I/O error

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GetFieldQuery(Query)

create a FieldQuery object.

Declaration

public virtual FieldQuery GetFieldQuery(Query query)

Parameters

Type	Name	Description
Lucene.Net.Search.Query	query	a query

Returns

Type	Description
FieldQuery	the created FieldQuery object

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GetFieldQuery(Query, IndexReader)

create a FieldQuery object.

Declaration

public virtual FieldQuery GetFieldQuery(Query query, IndexReader reader)

Parameters

Type	Name	Description
Lucene.Net.Search.Query	query	a query
Lucene.Net.Index.IndexReader	reader

Returns

Type	Description
FieldQuery	the created FieldQuery object