Class WordBreakSpellChecker

A spell checker whose sole function is to offer suggestions by combining multiple terms into one word and/or breaking terms into multiple words.

Inheritance
System.Object
WordBreakSpellChecker
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.Spell
Assembly: Lucene.Net.Suggest.dll
Syntax
public class WordBreakSpellChecker

Constructors

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WordBreakSpellChecker()

Creates a new spellchecker with default configuration values

Declaration
public WordBreakSpellChecker()
See Also

Fields

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SEPARATOR_TERM

Term that can be used to prohibit adjacent terms from being combined

Declaration
public static readonly Term SEPARATOR_TERM
Field Value
Type Description
Lucene.Net.Index.Term

Properties

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MaxChanges

Gets or sets the maximum numbers of changes (word breaks or combinations) to make on the original term(s). Default=1.

Declaration
public virtual int MaxChanges { get; set; }
Property Value
Type Description
System.Int32
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MaxCombineWordLength

Gets or sets the maximum length of a suggestion made by combining 1 or more original terms. Default=20.

Declaration
public virtual int MaxCombineWordLength { get; set; }
Property Value
Type Description
System.Int32
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MaxEvaluations

Gets or sets the maximum number of word combinations to evaluate. Default=1000. A higher value might improve result quality. A lower value might improve performance.

Declaration
public virtual int MaxEvaluations { get; set; }
Property Value
Type Description
System.Int32
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MinBreakWordLength

Gets or sets the minimum length to break words down to. Default=1.

Declaration
public virtual int MinBreakWordLength { get; set; }
Property Value
Type Description
System.Int32
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MinSuggestionFrequency

Gets or sets the minimum frequency a term must have to be included as part of a suggestion. Default=1 Not applicable when used with SUGGEST_MORE_POPULAR

Declaration
public virtual int MinSuggestionFrequency { get; set; }
Property Value
Type Description
System.Int32

Methods

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SuggestWordBreaks(Term, Int32, IndexReader, SuggestMode, WordBreakSpellChecker.BreakSuggestionSortMethod)

Generate suggestions by breaking the passed-in term into multiple words. The scores returned are equal to the number of word breaks needed so a lower score is generally preferred over a higher score.

Declaration
public virtual SuggestWord[][] SuggestWordBreaks(Term term, int maxSuggestions, IndexReader ir, SuggestMode suggestMode = SuggestMode.SUGGEST_WHEN_NOT_IN_INDEX, WordBreakSpellChecker.BreakSuggestionSortMethod sortMethod = WordBreakSpellChecker.BreakSuggestionSortMethod.NUM_CHANGES_THEN_MAX_FREQUENCY)
Parameters
Type Name Description
Lucene.Net.Index.Term term
System.Int32 maxSuggestions
Lucene.Net.Index.IndexReader ir
SuggestMode suggestMode
WordBreakSpellChecker.BreakSuggestionSortMethod sortMethod
Returns
Type Description
SuggestWord[][]

one or more arrays of words formed by breaking up the original term

Exceptions
Type Condition
System.IO.IOException

If there is a low-level I/O error.

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SuggestWordCombinations(Term[], Int32, IndexReader, SuggestMode)

Generate suggestions by combining one or more of the passed-in terms into single words. The returned CombineSuggestion contains both a SuggestWord and also an array detailing which passed-in terms were involved in creating this combination. The scores returned are equal to the number of word combinations needed, also one less than the length of the array OriginalTermIndexes. Generally, a suggestion with a lower score is preferred over a higher score.

To prevent two adjacent terms from being combined (for instance, if one is mandatory and the other is prohibited), separate the two terms with SEPARATOR_TERM

When suggestMode equals SUGGEST_WHEN_NOT_IN_INDEX, each suggestion will include at least one term not in the index.

When suggestMode equals SUGGEST_MORE_POPULAR, each suggestion will have the same, or better frequency than the most-popular included term.

Declaration
public virtual CombineSuggestion[] SuggestWordCombinations(Term[] terms, int maxSuggestions, IndexReader ir, SuggestMode suggestMode = SuggestMode.SUGGEST_WHEN_NOT_IN_INDEX)
Parameters
Type Name Description
Lucene.Net.Index.Term[] terms
System.Int32 maxSuggestions
Lucene.Net.Index.IndexReader ir
SuggestMode suggestMode
Returns
Type Description
CombineSuggestion[]

an array of words generated by combining original terms

Exceptions
Type Condition
System.IO.IOException

If there is a low-level I/O error.