Class FilteredTermsEnum

Abstract class for enumerating a subset of all terms.

Term enumerations are always ordered by Comparer. Each term in the enumeration is greater than all that precede it.

Please note: Consumers of this enumeration cannot call Seek(), it is forward only; it throws System.NotSupportedException when a seeking method is called.

Inheritance

System.Object

FilteredTermsEnum

Implements

IBytesRefIterator

Inherited Members

TermsEnum.Docs(IBits, DocsEnum)

TermsEnum.DocsAndPositions(IBits, DocsAndPositionsEnum)

TermsEnum.EMPTY

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.Index

Assembly: Lucene.Net.dll

Syntax

public abstract class FilteredTermsEnum : TermsEnum, IBytesRefIterator

Constructors

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FilteredTermsEnum(TermsEnum)

Creates a filtered TermsEnum on a terms enum.

Declaration

public FilteredTermsEnum(TermsEnum tenum)

Parameters

Type	Name	Description
TermsEnum	tenum	the terms enumeration to filter.

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FilteredTermsEnum(TermsEnum, Boolean)

Creates a filtered TermsEnum on a terms enum.

Declaration

public FilteredTermsEnum(TermsEnum tenum, bool startWithSeek)

Parameters

Type	Name	Description
TermsEnum	tenum	the terms enumeration to filter.
System.Boolean	startWithSeek	start with seek

Properties

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Attributes

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

Declaration

public override AttributeSource Attributes { get; }

Property Value

Type	Description
AttributeSource

Overrides

TermsEnum.Attributes

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Comparer

Declaration

public override IComparer<BytesRef> Comparer { get; }

Property Value

Type	Description
System.Collections.Generic.IComparer<BytesRef>

Overrides

TermsEnum.Comparer

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DocFreq

Declaration

public override int DocFreq { get; }

Property Value

Type	Description
System.Int32

Overrides

TermsEnum.DocFreq

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Ord

Declaration

public override long Ord { get; }

Property Value

Type	Description
System.Int64

Overrides

TermsEnum.Ord

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Term

Declaration

public override BytesRef Term { get; }

Property Value

Type	Description
BytesRef

Overrides

TermsEnum.Term

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TotalTermFreq

Declaration

public override long TotalTermFreq { get; }

Property Value

Type	Description
System.Int64

Overrides

TermsEnum.TotalTermFreq

Methods

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Accept(BytesRef)

Return if term is accepted, not accepted or the iteration should ended (and possibly seek).

Declaration

protected abstract FilteredTermsEnum.AcceptStatus Accept(BytesRef term)

Parameters

Type	Name	Description
BytesRef	term

Returns

Type	Description
FilteredTermsEnum.AcceptStatus

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Docs(IBits, DocsEnum, DocsFlags)

Declaration

public override DocsEnum Docs(IBits bits, DocsEnum reuse, DocsFlags flags)

Parameters

Type	Name	Description
IBits	bits
DocsEnum	reuse
DocsFlags	flags

Returns

Type	Description
DocsEnum

Overrides

TermsEnum.Docs(IBits, DocsEnum, DocsFlags)

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DocsAndPositions(IBits, DocsAndPositionsEnum, DocsAndPositionsFlags)

Declaration

public override DocsAndPositionsEnum DocsAndPositions(IBits bits, DocsAndPositionsEnum reuse, DocsAndPositionsFlags flags)

Parameters

Type	Name	Description
IBits	bits
DocsAndPositionsEnum	reuse
DocsAndPositionsFlags	flags

Returns

Type	Description
DocsAndPositionsEnum

Overrides

TermsEnum.DocsAndPositions(IBits, DocsAndPositionsEnum, DocsAndPositionsFlags)

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GetTermState()

Returns the filtered enums term state

Declaration

public override TermState GetTermState()

Returns

Type	Description
TermState

Overrides

TermsEnum.GetTermState()

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Next()

Declaration

public override BytesRef Next()

Returns

Type	Description
BytesRef

Overrides

TermsEnum.Next()

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NextSeekTerm(BytesRef)

On the first call to Next() or if Accept(BytesRef) returns YES_AND_SEEK or NO_AND_SEEK, this method will be called to eventually seek the underlying TermsEnum to a new position. On the first call, currentTerm will be null, later calls will provide the term the underlying enum is positioned at. This method returns per default only one time the initial seek term and then null, so no repositioning is ever done.

Override this method, if you want a more sophisticated TermsEnum, that repositions the iterator during enumeration. If this method always returns null the enum is empty.

Please note: this method should always provide a greater term than the last enumerated term, else the behavior of this enum violates the contract for TermsEnums.

Declaration

protected virtual BytesRef NextSeekTerm(BytesRef currentTerm)

Parameters

Type	Name	Description
BytesRef	currentTerm

Returns

Type	Description
BytesRef

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SeekCeil(BytesRef)

this enum does not support seeking!

Declaration

public override TermsEnum.SeekStatus SeekCeil(BytesRef term)

Parameters

Type	Name	Description
BytesRef	term

Returns

Type	Description
TermsEnum.SeekStatus

Overrides

TermsEnum.SeekCeil(BytesRef)

Exceptions

Type	Condition
System.NotSupportedException	In general, subclasses do not support seeking.

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SeekExact(BytesRef)

this enum does not support seeking!

Declaration

public override bool SeekExact(BytesRef term)

Parameters

Type	Name	Description
BytesRef	term

Returns

Type	Description
System.Boolean

Overrides

TermsEnum.SeekExact(BytesRef)

Exceptions

Type	Condition
System.NotSupportedException	In general, subclasses do not support seeking.

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SeekExact(BytesRef, TermState)

this enum does not support seeking!

Declaration

public override void SeekExact(BytesRef term, TermState state)

Parameters

Type	Name	Description
BytesRef	term
TermState	state

Overrides

TermsEnum.SeekExact(BytesRef, TermState)

Exceptions

Type	Condition
System.NotSupportedException	In general, subclasses do not support seeking.

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SeekExact(Int64)

this enum does not support seeking!

Declaration

public override void SeekExact(long ord)

Parameters

Type	Name	Description
System.Int64	ord

Overrides

TermsEnum.SeekExact(Int64)

Exceptions

Type	Condition
System.NotSupportedException	In general, subclasses do not support seeking.

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SetInitialSeekTerm(BytesRef)

Use this method to set the initial BytesRef to seek before iterating. This is a convenience method for subclasses that do not override NextSeekTerm(BytesRef). If the initial seek term is null (default), the enum is empty.

You can only use this method, if you keep the default implementation of NextSeekTerm(BytesRef).

Declaration

protected void SetInitialSeekTerm(BytesRef term)

Parameters

Type	Name	Description
BytesRef	term

Implements

IBytesRefIterator

Extension Methods

Number.IsNumber(Object)