org.elasticsearch.index.fielddata

Class IndexFieldData.XFieldComparatorSource

java.lang.Object

org.apache.lucene.search.FieldComparatorSource

org.elasticsearch.index.fielddata.IndexFieldData.XFieldComparatorSource

Direct Known Subclasses:

BytesRefFieldComparatorSource, DoubleValuesComparatorSource, FloatValuesComparatorSource, LongValuesComparatorSource

Enclosing interface:

IndexFieldData<FD extends AtomicFieldData>

public abstract static class IndexFieldData.XFieldComparatorSource
extends org.apache.lucene.search.FieldComparatorSource

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	IndexFieldData.XFieldComparatorSource.Nested Simple wrapper class around a filter that matches parent documents and a filter that matches child documents.

Constructor Summary

Constructors

Constructor and Description
XFieldComparatorSource()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	missingObject(java.lang.Object missingValue, boolean reversed) Return the missing object value according to the reduced type of the comparator.
java.lang.Object	missingValue(boolean reversed) Return a missing value that is understandable by SortField.setMissingValue(Object).
abstract org.apache.lucene.search.SortField.Type	reducedType()
boolean	sortMissingFirst(java.lang.Object missingValue) Whether missing values should be sorted first.
boolean	sortMissingLast(java.lang.Object missingValue) Whether missing values should be sorted last, this is the default.

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

newComparator

Methods inherited from class java.lang.Object

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

Constructor Detail

XFieldComparatorSource

public XFieldComparatorSource()

Method Detail

sortMissingFirst

public final boolean sortMissingFirst(java.lang.Object missingValue)

Whether missing values should be sorted first.

sortMissingLast

public final boolean sortMissingLast(java.lang.Object missingValue)

Whether missing values should be sorted last, this is the default.

missingObject

public final java.lang.Object missingObject(java.lang.Object missingValue,
                                            boolean reversed)

Return the missing object value according to the reduced type of the comparator.

reducedType

public abstract org.apache.lucene.search.SortField.Type reducedType()

missingValue

public java.lang.Object missingValue(boolean reversed)

Return a missing value that is understandable by SortField.setMissingValue(Object). Most implementations return null because they already replace the value at the fielddata level. However this can't work in case of strings since there is no such thing as a string which compares greater than any other string, so in that case we need to return SortField.STRING_FIRST or SortField.STRING_LAST so that the coordinating node knows how to deal with null values.