org.apache.lucene.index

Class SortedSetDocValues

java.lang.Object

org.apache.lucene.search.DocIdSetIterator

org.apache.lucene.index.SortedSetDocValues

Direct Known Subclasses:

FilterSortedSetDocValues, MultiDocValues.MultiSortedSetDocValues

public abstract class SortedSetDocValues
extends DocIdSetIterator

A multi-valued version of SortedDocValues.

Per-Document values in a SortedSetDocValues are deduplicated, dereferenced, and sorted into a dictionary of unique values. A pointer to the dictionary value (ordinal) can be retrieved for each document. Ordinals are dense and in increasing sorted order.

Field Summary

Fields

Modifier and Type	Field and Description
static long	NO_MORE_ORDS When returned by nextOrd() it means there are no more ordinals for the document.

Fields inherited from class org.apache.lucene.search.DocIdSetIterator

NO_MORE_DOCS

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SortedSetDocValues() Sole constructor.

Method Summary

Modifier and Type	Method and Description
abstract boolean	advanceExact(int target) Advance the iterator to exactly target and return whether target has a value.
abstract long	getValueCount() Returns the number of unique values.
TermsEnum	intersect(CompiledAutomaton automaton) Returns a TermsEnum over the values, filtered by a CompiledAutomaton The enum supports TermsEnum.ord().
abstract BytesRef	lookupOrd(long ord) Retrieves the value for the specified ordinal.
long	lookupTerm(BytesRef key) If key exists, returns its ordinal, else returns -insertionPoint-1, like Arrays.binarySearch.
abstract long	nextOrd() Returns the next ordinal for the current document.
TermsEnum	termsEnum() Returns a TermsEnum over the values.

Methods inherited from class org.apache.lucene.search.DocIdSetIterator

advance, all, cost, docID, empty, nextDoc, range, slowAdvance

Methods inherited from class java.lang.Object

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

Field Detail

NO_MORE_ORDS

public static final long NO_MORE_ORDS

When returned by nextOrd() it means there are no more ordinals for the document.

See Also:

Constant Field Values

Constructor Detail

SortedSetDocValues

protected SortedSetDocValues()

Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Detail

nextOrd

public abstract long nextOrd()
                      throws IOException

Returns the next ordinal for the current document. It is illegal to call this method after advanceExact(int) returned false.

Returns:

next ordinal for the document, or NO_MORE_ORDS. ordinals are dense, start at 0, then increment by 1 for the next value in sorted order.

Throws:

IOException

lookupOrd

public abstract BytesRef lookupOrd(long ord)
                            throws IOException

Retrieves the value for the specified ordinal. The returned BytesRef may be re-used across calls to lookupOrd so make sure to copy it if you want to keep it around.

Parameters:

ord - ordinal to lookup

Throws:

IOException

See Also:

nextOrd()

getValueCount

public abstract long getValueCount()

Returns the number of unique values.

Returns:

number of unique values in this SortedDocValues. This is also equivalent to one plus the maximum ordinal.

lookupTerm

public long lookupTerm(BytesRef key)
                throws IOException

If key exists, returns its ordinal, else returns -insertionPoint-1, like Arrays.binarySearch.

Parameters:

key - Key to look up

Throws:

IOException

termsEnum

public TermsEnum termsEnum()
                    throws IOException

Returns a TermsEnum over the values. The enum supports TermsEnum.ord() and TermsEnum.seekExact(long).

Throws:

IOException

intersect

public TermsEnum intersect(CompiledAutomaton automaton)
                    throws IOException

Returns a TermsEnum over the values, filtered by a CompiledAutomaton The enum supports TermsEnum.ord().

Throws:

IOException

advanceExact

public abstract boolean advanceExact(int target)
                              throws IOException

Advance the iterator to exactly target and return whether target has a value. target must be greater than or equal to the current doc ID and must be a valid doc ID, ie. ≥ 0 and < maxDoc. After this method returns, DocIdSetIterator.docID() returns target.

Throws:

IOException