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java.lang.Objectcom.google.common.base.Enums
@GwtCompatible(emulated=true) @Beta public final class Enums
Utility methods for working with Enum instances.
| Method Summary | ||
|---|---|---|
static Field |
getField(Enum<?> enumValue)
Returns the Field in which enumValue is defined. |
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static
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getIfPresent(Class<T> enumClass,
String value)
Returns an optional enum constant for the given type, using Enum.valueOf(java.lang.Class. |
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static
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valueOfFunction(Class<T> enumClass)
Returns a Function that maps an Enum name to the associated
Enum constant. |
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| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Method Detail |
|---|
@GwtIncompatible(value="reflection") public static Field getField(Enum<?> enumValue)
Field in which enumValue is defined.
For example, to get the Description annotation on the GOLF
constant of enum Sport, use
Enums.getField(Sport.GOLF).getAnnotation(Description.class).
public static <T extends Enum<T>> Function<String,T> valueOfFunction(Class<T> enumClass)
Function that maps an Enum name to the associated
Enum constant. The Function will return null if the
Enum constant does not exist.
enumClass - the Class of the Enum declaring the
constant values.
public static <T extends Enum<T>> Optional<T> getIfPresent(Class<T> enumClass,
String value)
Enum.valueOf(java.lang.Class, java.lang.String) . If the
constant does not exist, Optional.absent() is returned. A common use case is for parsing
user input or falling back to a default enum constant. For example,
Enums.getIfPresent(Country.class, countryInput).or(Country.DEFAULT);
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