Module org.apache.lucene.codecs

Package org.apache.lucene.codecs.blocktreeords

Class OrdsIntersectTermsEnum

java.lang.Object

org.apache.lucene.index.TermsEnum

org.apache.lucene.index.BaseTermsEnum

org.apache.lucene.codecs.blocktreeords.OrdsIntersectTermsEnum

All Implemented Interfaces:

BytesRefIterator

final class OrdsIntersectTermsEnum
extends BaseTermsEnum

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.index.TermsEnum

TermsEnum.SeekStatus

Field Summary

Fields

Modifier and Type	Field	Description
private FST.Arc<FSTOrdsOutputs.Output>[]	arcs
(package private) final CompiledAutomaton	compiledAutomaton
private OrdsIntersectTermsEnumFrame	currentFrame
(package private) final OrdsFieldReader	fr
private final FST.BytesReader	fstReader
(package private) final IndexInput	in
(package private) final RunAutomaton	runAutomaton
private BytesRef	savedStartTerm
private OrdsIntersectTermsEnumFrame[]	stack
private final BytesRef	term

Fields inherited from class org.apache.lucene.index.TermsEnum

EMPTY

Constructor Summary

Constructors

Constructor	Description
OrdsIntersectTermsEnum(OrdsFieldReader fr, CompiledAutomaton compiled, BytesRef startTerm)

Method Summary

Modifier and Type	Method	Description
private void	copyTerm()
int	docFreq()	Returns the number of documents containing the current term.
private FST.Arc<FSTOrdsOutputs.Output>	getArc(int ord)
private OrdsIntersectTermsEnumFrame	getFrame(int ord)
private int	getState()
ImpactsEnum	impacts(int flags)	Return a ImpactsEnum.
BytesRef	next()	Increments the iteration to the next BytesRef in the iterator.
long	ord()	Returns ordinal position for current term.
PostingsEnum	postings(PostingsEnum reuse, int flags)	Get PostingsEnum for the current term, with control over whether freqs, positions, offsets or payloads are required.
private OrdsIntersectTermsEnumFrame	pushFrame(int state)
TermsEnum.SeekStatus	seekCeil(BytesRef text)	Seeks to the specified term, if it exists, or to the next (ceiling) term.
void	seekExact(long ord)	Seeks to the specified term by ordinal (position) as previously returned by TermsEnum.ord().
boolean	seekExact(BytesRef text)	Attempts to seek to the exact term, returning true if the term is found.
private void	seekToStartTerm(BytesRef target)
private boolean	setSavedStartTerm(BytesRef startTerm)
BytesRef	term()	Returns current term.
TermState	termState()	Expert: Returns the TermsEnums internal state to position the TermsEnum without re-seeking the term dictionary.
long	totalTermFreq()	Returns the total number of occurrences of this term across all documents (the sum of the freq() for each doc that has this term).

Methods inherited from class org.apache.lucene.index.BaseTermsEnum

attributes, seekExact

Methods inherited from class org.apache.lucene.index.TermsEnum

postings

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

in

final IndexInput in

stack

private OrdsIntersectTermsEnumFrame[] stack

arcs

private FST.Arc<FSTOrdsOutputs.Output>[] arcs

runAutomaton

final RunAutomaton runAutomaton

compiledAutomaton

final CompiledAutomaton compiledAutomaton

currentFrame

private OrdsIntersectTermsEnumFrame currentFrame

term

private final BytesRef term

fstReader

private final FST.BytesReader fstReader

fr

final OrdsFieldReader fr

savedStartTerm

private BytesRef savedStartTerm

Constructor Details

OrdsIntersectTermsEnum

public OrdsIntersectTermsEnum(OrdsFieldReader fr,
 CompiledAutomaton compiled,
 BytesRef startTerm)
                       throws IOException

Throws:

IOException

Method Details

setSavedStartTerm

private boolean setSavedStartTerm(BytesRef startTerm)

termState

public TermState termState()
                    throws IOException

Description copied from class: TermsEnum

Expert: Returns the TermsEnums internal state to position the TermsEnum without re-seeking the term dictionary.

NOTE: A seek by TermState might not capture the AttributeSource's state. Callers must maintain the AttributeSource states separately

Overrides:

termState in class BaseTermsEnum

Throws:

IOException

See Also:

• TermState
• TermsEnum.seekExact(BytesRef, TermState)

getFrame

private OrdsIntersectTermsEnumFrame getFrame(int ord)
                                      throws IOException

Throws:

IOException

getArc

private FST.Arc<FSTOrdsOutputs.Output> getArc(int ord)

pushFrame

private OrdsIntersectTermsEnumFrame pushFrame(int state)
                                       throws IOException

Throws:

IOException

term

public BytesRef term()

Description copied from class: TermsEnum

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

Specified by:

term in class TermsEnum

docFreq

public int docFreq()
            throws IOException

Description copied from class: TermsEnum

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

Specified by:

docFreq in class TermsEnum

Throws:

IOException

totalTermFreq

public long totalTermFreq()
                   throws IOException

Description copied from class: TermsEnum

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.

Specified by:

totalTermFreq in class TermsEnum

Throws:

IOException

postings

public PostingsEnum postings(PostingsEnum reuse,
 int flags)
                      throws IOException

Description copied from class: TermsEnum

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.

NOTE: the returned iterator may return deleted documents, so deleted documents have to be checked on top of the PostingsEnum.

Specified by:

postings in class TermsEnum

Parameters:

reuse - pass a prior PostingsEnum for possible reuse

flags - specifies which optional per-document values you require; see PostingsEnum.FREQS

Throws:

IOException

impacts

public ImpactsEnum impacts(int flags)
                    throws IOException

Description copied from class: TermsEnum

Return a ImpactsEnum.

Specified by:

impacts in class TermsEnum

Throws:

IOException

See Also:

• TermsEnum.postings(PostingsEnum, int)

getState

private int getState()

seekToStartTerm

private void seekToStartTerm(BytesRef target)
                      throws IOException

Throws:

IOException

next

public BytesRef next()
              throws IOException

Description copied from interface: BytesRefIterator

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.

Returns:

the next BytesRef in the iterator or null if the end of the iterator is reached.

Throws:

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

copyTerm

private void copyTerm()

seekExact

public boolean seekExact(BytesRef text)

Description copied from class: TermsEnum

Attempts to seek to the exact term, returning true if the term is found. If this returns false, the enum is unpositioned. For some codecs, seekExact may be substantially faster than TermsEnum.seekCeil(org.apache.lucene.util.BytesRef).

Overrides:

seekExact in class BaseTermsEnum

Returns:

true if the term is found; return false if the enum is unpositioned.

seekExact

public void seekExact(long ord)

Description copied from class: TermsEnum

Seeks to the specified term by ordinal (position) as previously returned by TermsEnum.ord(). The target ord may be before or after the current ord, and must be within bounds.

Specified by:

seekExact in class TermsEnum

ord

public long ord()

Description copied from class: TermsEnum

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.

Specified by:

ord in class TermsEnum

seekCeil

public TermsEnum.SeekStatus seekCeil(BytesRef text)

Description copied from class: TermsEnum

Seeks to the specified term, if it exists, or to the next (ceiling) term. Returns SeekStatus to indicate whether exact term was found, a different term was found, or EOF was hit. The target term may be before or after the current term. If this returns SeekStatus.END, the enum is unpositioned.

Specified by:

seekCeil in class TermsEnum