Package io.blt.util

Class En

java.lang.Object

io.blt.util.En

public final class En
extends Object

Static utility methods for operating on Enum.

Method Summary

Modifier and Type	Method	Description
static <E extends Enum<E>> Optional<E>	of(Class<E> type, String name)	Returns the enum constant matching name as an Optional; otherwise, returns empty.
static <E extends Enum<E>> Optional<E>	ofIgnoreCase(Class<E> type, String name)	Returns the enum constant matching name as an Optional; otherwise, returns empty.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

of

public static <E extends Enum<E>> Optional<E> of(Class<E> type,
 String name)

Returns the enum constant matching name as an Optional; otherwise, returns empty. The name must match exactly.

This method will not throw for an invalid enum name and instead will return empty.

e.g.,

 of(DayOfWeek.class, "FRIDAY");    // Optional.of(DayOfWeek.FRIDAY)
 of(DayOfWeek.class, "friday");    // Optional.empty()
 of(DayOfWeek.class, "Worf");      // Optional.empty()
 of(DayOfWeek.class, "");          // Optional.empty()
 

Type Parameters:

E - The type of the Enum

Parameters:

type - The Class object of the enum class

name - The name of the constant to return

Returns:

an Optional containing the enum constant if found

Throws:

NullPointerException - if type or name is null

ofIgnoreCase

public static <E extends Enum<E>> Optional<E> ofIgnoreCase(Class<E> type,
 String name)

Returns the enum constant matching name as an Optional; otherwise, returns empty. The name comparison is case-insensitive.

This method will not throw for an invalid enum name and instead will return empty.

 ofIgnoreCase(DayOfWeek.class, "FRIDAY");    // Optional.of(DayOfWeek.FRIDAY)
 ofIgnoreCase(DayOfWeek.class, "friday");    // Optional.of(DayOfWeek.FRIDAY)
 ofIgnoreCase(DayOfWeek.class, "Worf");      // Optional.empty()
 ofIgnoreCase(DayOfWeek.class, "");          // Optional.empty()
 

Type Parameters:

E - The type of the Enum

Parameters:

type - The Class object of the enum class

name - The name of the constant to return

Returns:

an Optional containing the enum constant if found

Throws:

NullPointerException - if type or name is null