org.apache.lucene.search
Class FieldValueHitQueue
java.lang.Object
org.apache.lucene.util.PriorityQueue
org.apache.lucene.search.FieldValueHitQueue
public abstract class FieldValueHitQueue
- extends PriorityQueue
Expert: A hit queue for sorting by hits by terms in more than one field.
Uses FieldCache.DEFAULT
for maintaining
internal term lookup tables.
This class will not resolve SortField.AUTO types, and expects the type
of all SortFields used for construction to already have been resolved.
SortField.detectFieldType(IndexReader, String)
is a utility method which
may be used for field type detection.
NOTE: This API is experimental and might change in
incompatible ways in the next release.
- Since:
- 2.9
- Version:
- $Id:
- See Also:
Searcher.search(Query,Filter,int,Sort)
,
FieldCache
Methods inherited from class org.apache.lucene.util.PriorityQueue |
add, adjustTop, clear, getSentinelObject, initialize, insert, insertWithOverflow, pop, put, size, top, updateTop |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
fields
protected final SortField[] fields
- Stores the sort criteria being used.
comparators
protected final FieldComparator[] comparators
reverseMul
protected final int[] reverseMul
create
public static FieldValueHitQueue create(SortField[] fields,
int size)
throws IOException
- Creates a hit queue sorted by the given list of fields.
NOTE: The instances returned by this method
pre-allocate a full array of length numHits
.
- Parameters:
fields
- SortField array we are sorting by in priority order (highest
priority first); cannot be null
or emptysize
- The number of hits to retain. Must be greater than zero.
- Throws:
IOException
lessThan
protected abstract boolean lessThan(Object a,
Object b)
- Description copied from class:
PriorityQueue
- Determines the ordering of objects in this priority queue. Subclasses
must define this one method.
- Specified by:
lessThan
in class PriorityQueue
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