com.devexperts.util

Interface IndexerFunction.LongKey<V>

All Superinterfaces:

IndexerFunction<Long,V>, Serializable

All Known Implementing Classes:

NumberKeyIndexer

Enclosing interface:

IndexerFunction<K,V>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface IndexerFunction.LongKey<V>
extends IndexerFunction<Long,V>

An IndexerFunction that distinguishes and identifies elements using long keys.

It assumes that elements are fully identifiable by plain numeric identifier and treats object keys as a mere wrappers. The hash function is computed using Long.hashCode(key) expression.

Nested Class Summary

Nested classes/interfaces inherited from interface com.devexperts.util.IndexerFunction

IndexerFunction.DefaultIdentityKey, IndexerFunction.DefaultIndexerFunction, IndexerFunction.IdentityKey<K,V>, IndexerFunction.IntKey<V>, IndexerFunction.LongKey<V>

Field Summary

Fields inherited from interface com.devexperts.util.IndexerFunction

DEFAULT, DEFAULT_IDENTITY_KEY

Method Summary

Modifier and Type	Method and Description
long	getNumberKey(V value) Returns number key for specified value to be used for hashing and identification; called when explicit number key is needed or when other methods delegate operations as specified.
default Long	getObjectKey(V value) Returns object key for specified value to be used for hashing and identification; called when explicit object key is needed or when other methods delegate operations as specified.
default int	hashCodeByKey(Long key) Returns hash code for specified object key; called when performing operations using object keys.
default int	hashCodeByValue(V value) Returns hash code for specified value; called when performing value-based operations, including rehash.
default boolean	matchesByKey(Long key, V value) Determines if specified object key matches specified value; called when performing operations using object keys.
default boolean	matchesByValue(V newValue, V oldValue) Determines if specified new value matches specified old value; called when performing value-based operations.

Methods inherited from interface com.devexperts.util.IndexerFunction

hashCodeByKey, matchesByKey

Method Detail

getNumberKey

long getNumberKey(V value)

Returns number key for specified value to be used for hashing and identification; called when explicit number key is needed or when other methods delegate operations as specified.

Specified by:

getNumberKey in interface IndexerFunction<Long,V>

hashCodeByValue

default int hashCodeByValue(V value)

Returns hash code for specified value; called when performing value-based operations, including rehash.

This implementation delegates to hashCodeByKey(getNumberKey(value)) expression.

Specified by:

hashCodeByValue in interface IndexerFunction<Long,V>

matchesByValue

default boolean matchesByValue(V newValue,
                               V oldValue)

Determines if specified new value matches specified old value; called when performing value-based operations.

This implementation delegates to (getNumberKey(newValue) == getNumberKey(oldValue)) expression.

Specified by:

matchesByValue in interface IndexerFunction<Long,V>

getObjectKey

default Long getObjectKey(V value)

Returns object key for specified value to be used for hashing and identification; called when explicit object key is needed or when other methods delegate operations as specified.

This implementation delegates to getNumberKey(value) expression.

Specified by:

getObjectKey in interface IndexerFunction<Long,V>

hashCodeByKey

default int hashCodeByKey(Long key)

Returns hash code for specified object key; called when performing operations using object keys.

This implementation delegates to hashCodeByKey(key.longValue()) expression.

Specified by:

hashCodeByKey in interface IndexerFunction<Long,V>

matchesByKey

default boolean matchesByKey(Long key,
                             V value)

Determines if specified object key matches specified value; called when performing operations using object keys.

This implementation delegates to (key == getNumberKey(value)) expression.

Specified by:

matchesByKey in interface IndexerFunction<Long,V>