org.bluedb.api.index

Interface LongIndexKeyExtractor<V extends java.io.Serializable>

Type Parameters:

V - the value type of the collection being indexed

All Superinterfaces:

KeyExtractor<LongKey,V>, java.io.Serializable

public interface LongIndexKeyExtractor<V extends java.io.Serializable>
extends KeyExtractor<LongKey,V>

This is used by the BlueIndex class to extract longs from each value in the BlueCollection. The value can then be quickly found using those longs. Note that key extractors are serialized by BlueIndex and for this reason it is NOT recommended to use lambdas or anonymous inner classes to define key extractors.

Method Summary

Modifier and Type	Method and Description
default java.util.List<LongKey>	extractKeys(V value) Extracts data from the given value in the form of index keys.
java.util.List<java.lang.Long>	extractLongsForIndex(V value) Extracts longs from the given value in order to create index keys.
default java.lang.Class<LongKey>	getType()

Method Detail

getType

default java.lang.Class<LongKey> getType()

Specified by:

getType in interface KeyExtractor<LongKey,V extends java.io.Serializable>

Returns:

the index key type class

extractKeys

default java.util.List<LongKey> extractKeys(V value)

Description copied from interface: KeyExtractor

Extracts data from the given value in the form of index keys. The BlueIndex class uses this method to map the resulting index keys to this value.

Specified by:

extractKeys in interface KeyExtractor<LongKey,V extends java.io.Serializable>

Parameters:

value - the value from which index keys are to be extracted

Returns:

one or many index keys representing the data that this value should be indexed on

extractLongsForIndex

java.util.List<java.lang.Long> extractLongsForIndex(V value)

Extracts longs from the given value in order to create index keys. The BlueIndex class uses this method to map the resulting index keys to this value.

Parameters:

value - the value from which index keys are to be extracted

Returns:

one or many longs that this value should be indexed on