tech.jhipster.lite.shared.enumeration.domain.Enums Maven / Gradle / Ivy
package tech.jhipster.lite.shared.enumeration.domain;
import java.util.Arrays;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.stream.Collectors;
import tech.jhipster.lite.shared.error.domain.Assert;
public final class Enums {
private static final EnumMappings MAPPINGS = new EnumMappings();
private Enums() {}
public static , To extends Enum> To map(Enum from, Class to) {
Assert.notNull("to", to);
if (from == null) {
return null;
}
return MAPPINGS.get(from, to);
}
private static final class EnumMappings {
private final Map, Map, Enum>> cache = new ConcurrentHashMap<>();
@SuppressWarnings("unchecked")
private , To extends Enum> To get(Enum from, Class to) {
return (To) cache.computeIfAbsent(new CacheKey<>(from.getClass(), to), buildCache(from)).get(from);
}
@SuppressWarnings("unchecked")
private > Function, Map, Enum>> buildCache(Enum from) {
return key -> {
try {
return Arrays.stream(key.from().getEnumConstants()).collect(
Collectors.toMap(Function.identity(), source -> Enum.valueOf(key.to(), source.name()))
);
} catch (IllegalArgumentException e) {
throw new UnmappableEnumException(from.getClass(), key.to());
}
};
}
private record CacheKey, To extends Enum>(Class from, Class to) {}
}
}