Package org.apache.lucene.index

Class IndexSorter.StringSorter

java.lang.Object

org.apache.lucene.index.IndexSorter.StringSorter

All Implemented Interfaces:

IndexSorter

Enclosing interface:

IndexSorter

public static final class IndexSorter.StringSorter
extends Object
implements IndexSorter

Sorts documents based on terms from a SortedDocValues instance

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.lucene.index.IndexSorter

IndexSorter.ComparableProvider, IndexSorter.DocComparator, IndexSorter.DoubleSorter, IndexSorter.FloatSorter, IndexSorter.IntSorter, IndexSorter.LongSorter, IndexSorter.NumericDocValuesProvider, IndexSorter.SortedDocValuesProvider, IndexSorter.StringSorter

Constructor Summary

Constructors

Constructor	Description
StringSorter(String providerName, Object missingValue, boolean reverse, IndexSorter.SortedDocValuesProvider valuesProvider)	Creates a new StringSorter

Method Summary

Modifier and Type	Method	Description
IndexSorter.ComparableProvider[]	getComparableProviders(List<? extends LeafReader> readers)	Get an array of IndexSorter.ComparableProvider, one per segment, for merge sorting documents in different segments
IndexSorter.DocComparator	getDocComparator(LeafReader reader, int maxDoc)	Get a comparator that determines the sort order of docs within a single Reader.
String	getProviderName()	The SPI-registered name of a SortFieldProvider that will deserialize the parent SortField

Methods inherited from class java.lang.Object

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

Constructor Details

StringSorter

public StringSorter(String providerName,
 Object missingValue,
 boolean reverse,
 IndexSorter.SortedDocValuesProvider valuesProvider)

Creates a new StringSorter

Method Details

getComparableProviders

public IndexSorter.ComparableProvider[] getComparableProviders(List<? extends LeafReader> readers)
                                                        throws IOException

Description copied from interface: IndexSorter

Get an array of IndexSorter.ComparableProvider, one per segment, for merge sorting documents in different segments

Specified by:

getComparableProviders in interface IndexSorter

Parameters:

readers - the readers to be merged

Throws:

IOException

getDocComparator

public IndexSorter.DocComparator getDocComparator(LeafReader reader,
 int maxDoc)
                                           throws IOException

Description copied from interface: IndexSorter

Get a comparator that determines the sort order of docs within a single Reader.

NB We cannot simply use the FieldComparator API because it requires docIDs to be sent in-order. The default implementations allocate array[maxDoc] to hold native values for comparison, but 1) they are transient (only alive while sorting this one segment) and 2) in the typical index sorting case, they are only used to sort newly flushed segments, which will be smaller than merged segments

Specified by:

getDocComparator in interface IndexSorter

Parameters:

reader - the Reader to sort

maxDoc - the number of documents in the Reader

Throws:

IOException

getProviderName

public String getProviderName()

Description copied from interface: IndexSorter

The SPI-registered name of a SortFieldProvider that will deserialize the parent SortField

Specified by:

getProviderName in interface IndexSorter