package com.opencsv.bean;
   
   import com.opencsv.ICSVParser;
   import com.opencsv.exceptions.CsvDataTypeMismatchException;
   import org.apache.commons.lang3.StringUtils;
   
   import java.util.Locale;
   import java.util.ResourceBundle;
   import java.util.UUID;
  import java.util.regex.Pattern;
  
  /**
   * This class converts an String to a {@link java.util.UUID}
   * instance.
   *
   * @author Scott Conway
   * @since 5.4
   */
  public class ConverterUUID extends AbstractCsvConverter {
      private static final String UUID_REGEX_PATTERN = "\\b[0-9a-fA-F]{8}\\b-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-\\b[0-9a-fA-F]{12}\\b";
      /**
       * Initializes the class.
       *
       * @param errorLocale The locale to use for error messages
       */
      public ConverterUUID(Locale errorLocale) {
          super(UUID.class, null, null, errorLocale);
      }
  
      @Override
      public Object convertToRead(String value) throws CsvDataTypeMismatchException {
          if (StringUtils.isBlank(value)) {
              return null;
          }
          String trimmedString = value.trim();
          if (!Pattern.matches(UUID_REGEX_PATTERN, trimmedString)) {
              throw new CsvDataTypeMismatchException(value, type, String.format(
                      ResourceBundle.getBundle(ICSVParser.DEFAULT_BUNDLE_NAME).getString("invalid.uuid.value"),
                      value, type.getName()));
          }
          return UUID.fromString(trimmedString);
      }
  }