code: package zemberek.core.enums;
  
  import com.google.common.base.Strings;
  import com.google.common.collect.Collections2;
  import com.google.common.collect.ImmutableMap;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Locale;
  import java.util.Set;
  
  /**
   * This is a convenience class for enums that also are represented with strings. This classes can be
   * useful for loading enum values from textual data.
   */
  public class StringEnumMap<T extends StringEnum> {
  
    private final ImmutableMap<String, T> map;
    private final Class<T> clazz;
    private boolean ignoreCase;
  
    private StringEnumMap(Class<T> clazz) {
      this(clazz, true);
    }
  
    private StringEnumMap(Class<T> clazz, boolean ignoreCase) {
      this.clazz = clazz;
      final ImmutableMap.Builder<String, T> mapBuilder = new ImmutableMap.Builder<>();
      for (T senum : clazz.getEnumConstants()) {
        mapBuilder.put(senum.getStringForm(), senum);
        if (ignoreCase) {
          String lowerCase = senum.getStringForm().toLowerCase(Locale.ENGLISH);
          if (!lowerCase.equals(senum.getStringForm())) {
            mapBuilder.put(lowerCase, senum);
          }
        }
      }
      this.map = mapBuilder.build();
      this.ignoreCase = ignoreCase;
    }
  
    public static <T extends StringEnum> StringEnumMap<T> get(Class<T> clazz) {
      return new StringEnumMap<>(clazz);
    }
  
    public T getEnum(String s) {
      if (Strings.isNullOrEmpty(s)) {
        throw new IllegalArgumentException("Input String must have content.");
      }
      T res = map.get(s);
      if (res == null) {
        throw new IllegalArgumentException(
            "Cannot find a representation of :" + s + " for enum class:" + clazz.getName());
      }
      return res;
    }
  
    public Set<String> getKeysSet() {
      return map.keySet();
    }
  
    public Collection<T> getEnums(Collection<String> strings) {
      if (strings == null || strings.isEmpty()) {
        return Collections.emptyList();
      } else {
        return Collections2.transform(strings, this::getEnum);
      }
    }
  
    public boolean enumExists(String s) {
      return ignoreCase ? map.containsKey(s) || map.containsKey(s.toLowerCase(Locale.ENGLISH))
          : map.containsKey(s);
    }
  }
  