org.apache.lucene.index
Class FilterAtomicReader.FilterTermsEnum

java.lang.Object
  org.apache.lucene.index.TermsEnum
      org.apache.lucene.index.FilterAtomicReader.FilterTermsEnum

All Implemented Interfaces:

BytesRefIterator

Enclosing class:

FilterAtomicReader

public static class FilterAtomicReader.FilterTermsEnum
extends TermsEnum

Base class for filtering TermsEnum implementations.

Nested Class Summary

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

TermsEnum.SeekStatus

Field Summary

protected TermsEnum

in The underlying TermsEnum instance.

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

EMPTY

Constructor Summary

FilterAtomicReader.FilterTermsEnum(TermsEnum in)
Creates a new FilterTermsEnum

Method Summary

AttributeSource	attributes() Returns the related attributes.
int	docFreq() Returns the number of documents containing the current term.
DocsEnum	docs(Bits liveDocs, DocsEnum reuse, int flags) Get DocsEnum for the current term, with control over whether freqs are required.
DocsAndPositionsEnum	docsAndPositions(Bits liveDocs, DocsAndPositionsEnum reuse, int flags) Get DocsAndPositionsEnum for the current term, with control over whether offsets and payloads are required.
Comparator<BytesRef>	getComparator() Return the BytesRef Comparator used to sort terms provided by the iterator.
BytesRef	next() Increments the iteration to the next BytesRef in the iterator.
long	ord() Returns ordinal position for current term.
TermsEnum.SeekStatus	seekCeil(BytesRef text, boolean useCache) Expert: just like TermsEnum.seekCeil(BytesRef) but allows you to control whether the implementation should attempt to use its term cache (if it uses one).
boolean	seekExact(BytesRef text, boolean useCache) Attempts to seek to the exact term, returning true if the term is found.
void	seekExact(BytesRef term, TermState state) Expert: Seeks a specific position by TermState previously obtained from TermsEnum.termState().
void	seekExact(long ord) Seeks to the specified term by ordinal (position) as previously returned by TermsEnum.ord().
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.TermsEnum

docs, docsAndPositions, seekCeil

Methods inherited from class java.lang.Object

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

Field Detail

in

protected final TermsEnum in

The underlying TermsEnum instance.

Constructor Detail

FilterAtomicReader.FilterTermsEnum

public FilterAtomicReader.FilterTermsEnum(TermsEnum in)

Creates a new FilterTermsEnum

Parameters:

in - the underlying TermsEnum instance.

Method Detail

seekExact

public boolean seekExact(BytesRef text,
                         boolean useCache)
                  throws IOException

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, boolean).

Overrides:

seekExact in class TermsEnum

Throws:

IOException

seekCeil

public TermsEnum.SeekStatus seekCeil(BytesRef text,
                                     boolean useCache)
                              throws IOException

Description copied from class: TermsEnum

Expert: just like TermsEnum.seekCeil(BytesRef) but allows you to control whether the implementation should attempt to use its term cache (if it uses one).

Specified by:

seekCeil in class TermsEnum

Throws:

IOException

seekExact

public void seekExact(long ord)
               throws IOException

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

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.

term

public BytesRef term()
              throws IOException

Description copied from class: TermsEnum

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

Specified by:

term in class TermsEnum

Throws:

IOException

ord

public long ord()
         throws IOException

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

Throws:

IOException

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). This will be -1 if the codec doesn't support this measure. Note that, like other term measures, this measure does not take deleted documents into account.

Specified by:

totalTermFreq in class TermsEnum

Throws:

IOException

docs

public DocsEnum docs(Bits liveDocs,
                     DocsEnum reuse,
                     int flags)
              throws IOException

Description copied from class: TermsEnum

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

Specified by:

docs in class TermsEnum

Parameters:

liveDocs - unset bits are documents that should not be returned

reuse - pass a prior DocsEnum for possible reuse

flags - specifies which optional per-document values you require; see DocsEnum.FLAG_FREQS

Throws:

IOException

See Also:

TermsEnum.docs(Bits, DocsEnum, int)

docsAndPositions

public DocsAndPositionsEnum docsAndPositions(Bits liveDocs,
                                             DocsAndPositionsEnum reuse,
                                             int flags)
                                      throws IOException

Description copied from class: TermsEnum

Get DocsAndPositionsEnum for the current term, with control over whether offsets and payloads are required. Some codecs may be able to optimize their implementation when offsets and/or payloads are not required. Do not call this when the enum is unpositioned. This will return null if positions were not indexed.

Specified by:

docsAndPositions in class TermsEnum

Parameters:

liveDocs - unset bits are documents that should not be returned

reuse - pass a prior DocsAndPositionsEnum for possible reuse

flags - specifies which optional per-position values you require; see DocsAndPositionsEnum.FLAG_OFFSETS and DocsAndPositionsEnum.FLAG_PAYLOADS.

Throws:

IOException

getComparator

public Comparator<BytesRef> getComparator()

Description copied from interface: BytesRefIterator

Return the BytesRef Comparator used to sort terms provided by the iterator. This may return null if there are no items or the iterator is not sorted. Callers may invoke this method many times, so it's best to cache a single instance & reuse it.

seekExact

public void seekExact(BytesRef term,
                      TermState state)
               throws IOException

Description copied from class: TermsEnum

Expert: Seeks a specific position by TermState previously obtained from TermsEnum.termState(). Callers should maintain the TermState to use this method. Low-level implementations may position the TermsEnum without re-seeking the term dictionary.

Seeking by TermState should only be used iff the enum the state was obtained from and the enum the state is used for seeking are obtained from the same IndexReader.

NOTE: Using this method with an incompatible TermState might leave this TermsEnum in undefined state. On a segment level TermState instances are compatible only iff the source and the target TermsEnum operate on the same field. If operating on segment level, TermState instances must not be used across segments.

NOTE: A seek by TermState might not restore the AttributeSource's state. AttributeSource states must be maintained separately if this method is used.

Overrides:

seekExact in class TermsEnum

Parameters:

term - the term the TermState corresponds to

state - the TermState

Throws:

IOException

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 TermsEnum

Throws:

IOException

See Also:

TermState, TermsEnum.seekExact(BytesRef, TermState)

attributes

public AttributeSource attributes()

Description copied from class: TermsEnum

Returns the related attributes.

Overrides:

attributes in class TermsEnum