core/org.gnit.lucenekmp.index/AutomatonTermsEnum

AutomatonTermsEnum

open class AutomatonTermsEnum(tenum: TermsEnum?, compiled: CompiledAutomaton) : FilteredTermsEnum

A FilteredTermsEnum that enumerates terms based upon what is accepted by a DFA.

The algorithm is such:

As long as matches are successful, keep reading sequentially.
When a match fails, skip to the next string in lexicographic order that does not enter a reject state.

The algorithm does not attempt to actually skip to the next string that is completely accepted. This is not possible when the language accepted by the FSM is not finite (i.e. * operator).

Constructors

AutomatonTermsEnum

constructor(tenum: TermsEnum?, compiled: CompiledAutomaton)

Functions

attributes

open override fun attributes(): AttributeSource

Returns the related attributes, the returned AttributeSource is shared with the delegate TermsEnum.

docFreq

open override fun docFreq(): Int

Returns the number of documents containing the current term. Do not call this when the enum is unpositioned. SeekStatus.END.

impacts

open override fun impacts(flags: Int): ImpactsEnum

Return a ImpactsEnum.

open override fun next(): BytesRef?

Increments the iteration to the next BytesRef in the iterator. Returns the resulting BytesRef or null if the end of the iterator is reached. The returned BytesRef may be re-used across calls to next. After this method returns null, do not call it again: the results are undefined.

ord

open override fun ord(): Long

Returns ordinal position for current term. This is an optional method (the codec may throw UnsupportedOperationException). Do not call this when the enum is unpositioned.

postings

open override fun postings(reuse: PostingsEnum?, flags: Int): PostingsEnum?

Get PostingsEnum for the current term, with control over whether freqs, positions, offsets or payloads are required. Do not call this when the enum is unpositioned. This method will not return null.

fun postings(reuse: PostingsEnum?): PostingsEnum?

Get PostingsEnum for the current term. Do not call this when the enum is unpositioned. This method will not return null.

prepareSeekExact

open override fun prepareSeekExact(text: BytesRef): IOBooleanSupplier

This enum does not support seeking!

seekCeil

open override fun seekCeil(term: BytesRef): TermsEnum.SeekStatus

This enum does not support seeking!

seekExact

open override fun seekExact(ord: Long)

open override fun seekExact(term: BytesRef): Boolean

open override fun seekExact(term: BytesRef, state: TermState)

This enum does not support seeking!

term

open override fun term(): BytesRef?

Returns current term. Do not call this when the enum is unpositioned.

termState

open override fun termState(): TermState

Returns the filtered enums term state

totalTermFreq

open override fun totalTermFreq(): Long

Returns the total number of occurrences of this term across all documents (the sum of the freq() for each doc that has this term). Note that, like other term measures, this measure does not take deleted documents into account.