de.caff.generics

Interface HashCodeCalculator<T>

All Known Implementing Classes:

HashCoder

public interface HashCodeCalculator<T>

Calculator interface for generalized hash code calculation.

Author:

Rammi

See Also:

Matcher

Field Summary

Fields

Modifier and Type	Field and Description
static HashCodeCalculator<java.lang.Object>	NATURAL Default hash code calculator which just uses the object's own hash code implementation.
static HashCodeCalculator<java.lang.Object>	NATURAL_NULL_SAFE Default hash code calculator which just uses the object's own hash code implementation, but takes care of null values.
static HashCodeCalculator<java.lang.Object>	OBJECTS Default hash code calculator which just uses Objects.hashCode(java.lang.Object).

Method Summary

Modifier and Type	Method and Description
int	getHashCode(T obj) Get the hash code value of the given object.
static <K> HashCodeCalculator<K>	natural() Get a hash code calculator which uses the object's own hashcode implementation.
static <K> HashCodeCalculator<K>	naturalNullSafe() Get a hash code calculator which uses the object's own hashcode implementation, but takes care of null values.
static <K> HashCodeCalculator<K>	objects() Get a hash code calculator which uses Objects.hashCode(java.lang.Object).

Field Detail

OBJECTS

static final HashCodeCalculator<java.lang.Object> OBJECTS

Default hash code calculator which just uses Objects.hashCode(java.lang.Object).

NATURAL

static final HashCodeCalculator<java.lang.Object> NATURAL

Default hash code calculator which just uses the object's own hash code implementation. Note that this requires non-null objects.

NATURAL_NULL_SAFE

static final HashCodeCalculator<java.lang.Object> NATURAL_NULL_SAFE

Default hash code calculator which just uses the object's own hash code implementation, but takes care of null values.

Method Detail

getHashCode

int getHashCode(T obj)

Get the hash code value of the given object.

Parameters:

obj - object for which the hash code is requested

Returns:

hash code

objects

@NotNull
static <K> HashCodeCalculator<K> objects()

Get a hash code calculator which uses Objects.hashCode(java.lang.Object).

Type Parameters:

K - object type

Returns:

natural hashCode implementation

natural

@NotNull
static <K> HashCodeCalculator<K> natural()

Get a hash code calculator which uses the object's own hashcode implementation. Note that this requires non-null objects. Use naturalNullSafe() to avoid this.

Type Parameters:

K - object type

Returns:

natural hashCode implementation

naturalNullSafe

@NotNull
static <K> HashCodeCalculator<K> naturalNullSafe()

Get a hash code calculator which uses the object's own hashcode implementation, but takes care of null values.

Type Parameters:

K - object type

Returns:

natural hashCode implementation