com.devexperts.util

Interface IndexerFunction.IntKey<V>

All Superinterfaces:

IndexerFunction<Integer,V>, Serializable

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.IntKey<V>
extends IndexerFunction<Integer,V>

An IndexerFunction that distinguishes and identifies elements using int 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 by taking int key value.

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
int	getIntKey(V value) Returns number key for specified value to be used for hashing and identification.
default 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 Integer	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(Integer 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(Integer 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

getIntKey

int getIntKey(V value)

Returns number key for specified value to be used for hashing and identification.

getNumberKey

default 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.

This implementation delegates to getIntKey(value) expression.

Specified by:

getNumberKey in interface IndexerFunction<Integer,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(getIntKey(value)) expression.

Specified by:

hashCodeByValue in interface IndexerFunction<Integer,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 (getIntKey(newValue) == getIntKey(oldValue)) expression.

Specified by:

matchesByValue in interface IndexerFunction<Integer,V>

getObjectKey

default Integer 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 getIntKey(value) expression.

Specified by:

getObjectKey in interface IndexerFunction<Integer,V>

hashCodeByKey

default int hashCodeByKey(Integer key)

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

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

Specified by:

hashCodeByKey in interface IndexerFunction<Integer,V>

matchesByKey

default boolean matchesByKey(Integer key,
                             V value)

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

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

Specified by:

matchesByKey in interface IndexerFunction<Integer,V>