Package io.vertigo.core.lang

Enum Class Cardinality

java.lang.Object

java.lang.Enum<Cardinality>

io.vertigo.core.lang.Cardinality

All Implemented Interfaces:

Serializable, Comparable<Cardinality>, Constable

public enum Cardinality
extends Enum<Cardinality>

Defines relationship multiplicities in data models. Supports three cardinality types: - Optional (0..1) - Symbol: ? - Mandatory (1) - Symbol: 1 - Multiple (0..*) - Symbol: * Used for defining and validating entity associations.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
MANY	Multiple relationship allowing zero or more instances.
ONE	Mandatory relationship requiring exactly one instance.
OPTIONAL_OR_NULLABLE	Optional relationship allowing zero or one instance.

Method Summary

Modifier and Type	Method	Description
static Cardinality	fromSymbol(String sCardinality)	Parses cardinality from standard notation symbol.
boolean	hasMany()	Checks if relationship allows multiple instances.
boolean	hasOne()	Checks if relationship requires exactly one instance.
boolean	isOptionalOrNullable()	Checks if relationship is optional.
String	toSymbol()	Converts cardinality to standard notation symbol.
static Cardinality	valueOf(String name)	Returns the enum constant of this class with the specified name.
static Cardinality[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

OPTIONAL_OR_NULLABLE

public static final Cardinality OPTIONAL_OR_NULLABLE

Optional relationship allowing zero or one instance. Used for nullable references. Symbol: ?

ONE

public static final Cardinality ONE

Mandatory relationship requiring exactly one instance. Used for required references. Symbol: 1

MANY

public static final Cardinality MANY

Multiple relationship allowing zero or more instances. Used for collections and lists. Symbol: *

Method Details

values

public static Cardinality[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static Cardinality valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null

isOptionalOrNullable

public boolean isOptionalOrNullable()

Checks if relationship is optional.

Returns:

true for OPTIONAL_OR_NULLABLE cardinality

hasOne

public boolean hasOne()

Checks if relationship requires exactly one instance.

Returns:

true for ONE cardinality

hasMany

public boolean hasMany()

Checks if relationship allows multiple instances.

Returns:

true for MANY cardinality

fromSymbol

public static Cardinality fromSymbol(String sCardinality)

Parses cardinality from standard notation symbol. Supported symbols: ?, 1, *

Parameters:

sCardinality - Symbol to parse

Returns:

Corresponding cardinality value

Throws:

VSystemException - if symbol is invalid

toSymbol

public String toSymbol()

Converts cardinality to standard notation symbol.

Returns:

Symbol (?, 1, or *)