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
IndexFieldData.XFieldComparatorSource()

Method Summary

Methods

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

IndexFieldData.XFieldComparatorSource

public IndexFieldData.XFieldComparatorSource()

Method Detail

sortMissingFirst

protected final boolean sortMissingFirst(Object missingValue)

Whether missing values should be sorted first.

sortMissingLast

protected final boolean sortMissingLast(Object missingValue)

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

missingObject

protected final Object missingObject(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 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.