org.apache.lucene.search

Interface ScoreDocComparator

public interface ScoreDocComparator

Expert: Compares two ScoreDoc objects for sorting.

Created: Feb 3, 2004 9:00:16 AM

Since: lucene 1.4

Version: $Id: ScoreDocComparator.java 150348 2004-05-19 23:05:27Z tjones $

Author: Tim Jones (Nacimiento Software)

Field Summary
static ScoreDocComparatorINDEXORDER
Special comparator for sorting hits according to index order (document number).
static ScoreDocComparatorRELEVANCE
Special comparator for sorting hits according to computed relevance (document score).
Method Summary
intcompare(ScoreDoc i, ScoreDoc j)
Compares two ScoreDoc objects and returns a result indicating their sort order.
intsortType()
Returns the type of sort.
ComparablesortValue(ScoreDoc i)
Returns the value used to sort the given document.

Field Detail

INDEXORDER

public static final ScoreDocComparator INDEXORDER
Special comparator for sorting hits according to index order (document number).

RELEVANCE

public static final ScoreDocComparator RELEVANCE
Special comparator for sorting hits according to computed relevance (document score).

Method Detail

compare

public int compare(ScoreDoc i, ScoreDoc j)
Compares two ScoreDoc objects and returns a result indicating their sort order.

Parameters: i First ScoreDoc j Second ScoreDoc

Returns: -1 if i should come before j
1 if i should come after j
0 if they are equal

See Also: java.util.Comparator

sortType

public int sortType()
Returns the type of sort. Should return SortField.SCORE, SortField.DOC, SortField.STRING, SortField.INTEGER, SortField.FLOAT or SortField.CUSTOM. It is not valid to return SortField.AUTO. This is used by multisearchers to determine how to collate results from their searchers.

Returns: One of the constants in SortField.

See Also: SortField

sortValue

public Comparable sortValue(ScoreDoc i)
Returns the value used to sort the given document. The object returned must implement the java.io.Serializable interface. This is used by multisearchers to determine how to collate results from their searchers.

Parameters: i Document

Returns: Serializable object

See Also: FieldDoc

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