Class AutomatonQuery

A Query that will match terms against a finite-state machine.

This query will match documents that contain terms accepted by a given finite-state machine. The automaton can be constructed with the Lucene.Net.Util.Automaton API. Alternatively, it can be created from a regular expression with RegexpQuery or from the standard Lucene wildcard syntax with WildcardQuery.

When the query is executed, it will create an equivalent DFA of the finite-state machine, and will enumerate the term dictionary in an intelligent way to reduce the number of comparisons. For example: the regular expression of [dl]og? will make approximately four comparisons: do, dog, lo, and log.

Note

This API is experimental and might change in incompatible ways in the next release.

Inheritance
System.Object
Query
MultiTermQuery
AutomatonQuery
RegexpQuery
WildcardQuery
Inherited Members
System.Object.Equals(System.Object, System.Object)
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Lucene.Net.Search
Assembly: Lucene.Net.dll
Syntax
public class AutomatonQuery : MultiTermQuery

Constructors

| Improve this Doc View Source

AutomatonQuery(Term, Automaton)

Create a new AutomatonQuery from an Automaton.

Declaration
public AutomatonQuery(Term term, Automaton automaton)
Parameters
Type Name Description
Term term

Term containing field and possibly some pattern structure. The term text is ignored.

Automaton automaton

Automaton to run, terms that are accepted are considered a match.

Fields

| Improve this Doc View Source

m_automaton

The automaton to match index terms against

Declaration
protected readonly Automaton m_automaton
Field Value
Type Description
Automaton
| Improve this Doc View Source

m_compiled

Declaration
protected readonly CompiledAutomaton m_compiled
Field Value
Type Description
CompiledAutomaton
| Improve this Doc View Source

m_term

Term containing the field, and possibly some pattern structure

Declaration
protected readonly Term m_term
Field Value
Type Description
Term

Properties

| Improve this Doc View Source

Automaton

Returns the automaton used to create this query

Declaration
public virtual Automaton Automaton { get; }
Property Value
Type Description
Automaton

Methods

| Improve this Doc View Source

Equals(Object)

Declaration
public override bool Equals(object obj)
Parameters
Type Name Description
System.Object obj
Returns
Type Description
System.Boolean
Overrides
| Improve this Doc View Source

GetHashCode()

Declaration
public override int GetHashCode()
Returns
Type Description
System.Int32
Overrides
| Improve this Doc View Source

GetTermsEnum(Terms, AttributeSource)

Declaration
protected override TermsEnum GetTermsEnum(Terms terms, AttributeSource atts)
Parameters
Type Name Description
Terms terms
AttributeSource atts
Returns
Type Description
TermsEnum
Overrides
| Improve this Doc View Source

ToString(String)

Declaration
public override string ToString(string field)
Parameters
Type Name Description
System.String field
Returns
Type Description
System.String
Overrides