Module org.apache.lucene.core

Package org.apache.lucene.search

Class SortedSetSelector.MinValue

java.lang.Object

org.apache.lucene.search.DocIdSetIterator

org.apache.lucene.index.DocValuesIterator

org.apache.lucene.index.SortedDocValues

org.apache.lucene.search.SortedSetSelector.MinValue

Enclosing class:

SortedSetSelector

static class SortedSetSelector.MinValue
extends SortedDocValues

Wraps a SortedSetDocValues and returns the first ordinal (min)

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final SortedSetDocValues	in
private int	ord

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

NO_MORE_DOCS

Constructor Summary

Constructors

Constructor	Description
MinValue(SortedSetDocValues in)

Method Summary

Modifier and Type	Method	Description
int	advance(int target)	Advances to the first beyond the current whose document number is greater than or equal to target, and returns the document number itself.
boolean	advanceExact(int target)	Advance the iterator to exactly target and return whether target has a value.
long	cost()	Returns the estimated cost of this DocIdSetIterator.
int	docID()	Returns the following: -1 if DocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int) were not called yet.
int	getValueCount()	Returns the number of unique values.
BytesRef	lookupOrd(int ord)	Retrieves the value for the specified ordinal.
int	lookupTerm(BytesRef key)	If key exists, returns its ordinal, else returns -insertionPoint-1, like Arrays.binarySearch.
int	nextDoc()	Advances to the next document in the set and returns the doc it is currently on, or DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the set. NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.
int	ordValue()	Returns the ordinal for the current docID.
private void	setOrd()

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

intersect, termsEnum

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

all, empty, range, slowAdvance

Methods inherited from class java.lang.Object

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

Field Details

in

final SortedSetDocValues in

ord

private int ord

Constructor Details

MinValue

MinValue(SortedSetDocValues in)

Method Details

docID

public int docID()

Description copied from class: DocIdSetIterator

Returns the following:

• -1 if DocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int) were not called yet.
• DocIdSetIterator.NO_MORE_DOCS if the iterator has exhausted.
• Otherwise it should return the doc ID it is currently on.

Specified by:

docID in class DocIdSetIterator

nextDoc

public int nextDoc()
            throws IOException

Description copied from class: DocIdSetIterator

Advances to the next document in the set and returns the doc it is currently on, or DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the set.
NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.

Specified by:

nextDoc in class DocIdSetIterator

Throws:

IOException

advance

public int advance(int target)
            throws IOException

Description copied from class: DocIdSetIterator

Advances to the first beyond the current whose document number is greater than or equal to target, and returns the document number itself. Exhausts the iterator and returns DocIdSetIterator.NO_MORE_DOCS if target is greater than the highest document number in the set.

The behavior of this method is undefined when called with target ≤ current , or after the iterator has exhausted. Both cases may result in unpredicted behavior.

When target > current it behaves as if written:

 int advance(int target) {
   int doc;
   while ((doc = nextDoc()) < target) {
   }
   return doc;
 }
 

Some implementations are considerably more efficient than that.

NOTE: this method may be called with DocIdSetIterator.NO_MORE_DOCS for efficiency by some Scorers. If your implementation cannot efficiently determine that it should exhaust, it is recommended that you check for that value in each call to this method.

Specified by:

advance in class DocIdSetIterator

Throws:

IOException

advanceExact

public boolean advanceExact(int target)
                     throws IOException

Description copied from class: DocValuesIterator

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.

Specified by:

advanceExact in class DocValuesIterator

Throws:

IOException

cost

public long cost()

Description copied from class: DocIdSetIterator

Returns the estimated cost of this DocIdSetIterator.

This is generally an upper bound of the number of documents this iterator might match, but may be a rough heuristic, hardcoded value, or otherwise completely inaccurate.

Specified by:

cost in class DocIdSetIterator

ordValue

public int ordValue()

Description copied from class: SortedDocValues

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

Specified by:

ordValue in class SortedDocValues

Returns:

ordinal for the document: this is dense, starts at 0, then increments by 1 for the next value in sorted order.

lookupOrd

public BytesRef lookupOrd(int ord)
                   throws IOException

Description copied from class: SortedDocValues

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

Specified by:

lookupOrd in class SortedDocValues

Parameters:

ord - ordinal to lookup (must be >= 0 and < SortedDocValues.getValueCount())

Throws:

IOException

See Also:

• SortedDocValues.ordValue()

getValueCount

public int getValueCount()

Description copied from class: SortedDocValues

Returns the number of unique values.

Specified by:

getValueCount in class SortedDocValues

Returns:

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

lookupTerm

public int lookupTerm(BytesRef key)
               throws IOException

Description copied from class: SortedDocValues

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

Overrides:

lookupTerm in class SortedDocValues

Parameters:

key - Key to look up

Throws:

IOException

setOrd

private void setOrd()
             throws IOException

Throws:

IOException