Module org.apache.lucene.sandbox

Package org.apache.lucene.sandbox.search

Class PhraseWildcardQuery.SegmentTermsSizeComparator

java.lang.Object

org.apache.lucene.sandbox.search.PhraseWildcardQuery.SegmentTermsSizeComparator

All Implemented Interfaces:

Comparator<LeafReaderContext>

Enclosing class:

PhraseWildcardQuery

protected class PhraseWildcardQuery.SegmentTermsSizeComparator
extends Object
implements Comparator<LeafReaderContext>

Compares segments based of the number of terms they contain.

This is used to sort segments incrementally by number of terms. This way the first segment to search is the smallest, so a term has the lowest probability to match in this segment. And if the term does not match, we credit unused expansions when searching the other next segments.

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	COMPARISON_ERROR_MESSAGE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	SegmentTermsSizeComparator()

Method Summary

Modifier and Type	Method	Description
int	compare(LeafReaderContext leafReaderContext1, LeafReaderContext leafReaderContext2)
protected List<LeafReaderContext>	createTermsSizeSortedCopyOf(List<LeafReaderContext> segments)
private long	getTermsSize(LeafReaderContext leafReaderContext)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Details

COMPARISON_ERROR_MESSAGE

private static final String COMPARISON_ERROR_MESSAGE

See Also:

• Constant Field Values

Constructor Details

SegmentTermsSizeComparator

protected SegmentTermsSizeComparator()

Method Details

compare

public int compare(LeafReaderContext leafReaderContext1,
 LeafReaderContext leafReaderContext2)

Specified by:

compare in interface Comparator<LeafReaderContext>

createTermsSizeSortedCopyOf

protected List<LeafReaderContext> createTermsSizeSortedCopyOf(List<LeafReaderContext> segments)
                                                       throws IOException

Throws:

IOException

getTermsSize

private long getTermsSize(LeafReaderContext leafReaderContext)
                   throws IOException

Throws:

IOException