org.apache.lucene.search

Class SimpleFieldComparator<T>

java.lang.Object

org.apache.lucene.search.FieldComparator<T>

org.apache.lucene.search.SimpleFieldComparator<T>

All Implemented Interfaces:

LeafFieldComparator

Direct Known Subclasses:

FieldComparator.NumericComparator

public abstract class SimpleFieldComparator<T>
extends FieldComparator<T>
implements LeafFieldComparator

Base FieldComparator implementation that is used for all contexts.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.search.FieldComparator

FieldComparator.DocComparator, FieldComparator.DoubleComparator, FieldComparator.FloatComparator, FieldComparator.IntComparator, FieldComparator.LongComparator, FieldComparator.NumericComparator<T extends Number>, FieldComparator.RelevanceComparator, FieldComparator.TermOrdValComparator, FieldComparator.TermValComparator

Constructor Summary

Constructors

Constructor and Description
SimpleFieldComparator()

Method Summary

Modifier and Type	Method and Description
protected abstract void	doSetNextReader(LeafReaderContext context) This method is called before collecting context.
LeafFieldComparator	getLeafComparator(LeafReaderContext context) Get a per-segment LeafFieldComparator to collect the given LeafReaderContext.
void	setScorer(Scorer scorer) Sets the Scorer to use in case a document's score is needed.

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

compare, compareValues, setTopValue, value

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lucene.search.LeafFieldComparator

compareBottom, compareTop, copy, setBottom

Constructor Detail

SimpleFieldComparator

public SimpleFieldComparator()

Method Detail

doSetNextReader

protected abstract void doSetNextReader(LeafReaderContext context)
                                 throws IOException

This method is called before collecting context.

Throws:

IOException

getLeafComparator

public final LeafFieldComparator getLeafComparator(LeafReaderContext context)
                                            throws IOException

Description copied from class: FieldComparator

Get a per-segment LeafFieldComparator to collect the given LeafReaderContext. All docIDs supplied to this LeafFieldComparator are relative to the current reader (you must add docBase if you need to map it to a top-level docID).

Specified by:

getLeafComparator in class FieldComparator<T>

Parameters:

context - current reader context

Returns:

the comparator to use for this segment

Throws:

IOException - if there is a low-level IO error

setScorer

public void setScorer(Scorer scorer)
               throws IOException

Description copied from interface: LeafFieldComparator

Sets the Scorer to use in case a document's score is needed.

Specified by:

setScorer in interface LeafFieldComparator

Parameters:

scorer - Scorer instance that you should use to obtain the current hit's score, if necessary.

Throws:

IOException