Method getIfPresent

output/java_guava/1.4.16/Enums.java:72–76

Returns an optional enum constant for the given type, using Enum#valueOf. 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, {@code Enums.getIfPresent(Country.class, country

(Class<T> enumClass, String value)

  public static <T extends Enum<T>> Optional<T> getIfPresent(Class<T> enumClass, String value) {
    checkNotNull(enumClass);
    checkNotNull(value);
    return Platform.getEnumIfPresent(enumClass, value);
  }

  @GwtIncompatible // java.lang.ref.WeakReference
  private static final Map<Class<? extends Enum<?>>, Map<String, WeakReference<? extends Enum<?>>>> enumConstantCache = new WeakHashMap<Class<? extends Enum<?>>, Map<String, WeakReference<? extends Enum<?>>>>();