package ch.qos.cal10n.util;
   
   import ch.qos.cal10n.Locale;
   import ch.qos.cal10n.LocaleData;
   
   /**
    * A base implementation which can extract cal10n annotation data from a yet unspecified
    * "enumType" type, e.g. an enum class or an enum Element.
    *
   * @author  Ceki Gulcu
   * @since 0.8
   */
  abstract public class AbstractAnnotationExtractor implements AnnotationExtractor {
  
    abstract protected LocaleData extractLocaleData();
  
    public Locale[] extractLocales() {
      LocaleData localeData = extractLocaleData();
      if (localeData == null) {
        return null;
      }
      return localeData.value();
    }
  
    public String[] extractLocaleNames() {
      Locale[] localeDataArray = extractLocales();
  
      if (localeDataArray == null) {
        return null;
      }
  
      String[] names = new String[localeDataArray.length];
      for (int i = 0; i < localeDataArray.length; i++) {
        names[i] = localeDataArray[i].value();
      }
      return names;
    }
  
  
    public String extractCharset(java.util.Locale juLocale) {
      LocaleData localeData = extractLocaleData();
      if (localeData == null) {
        return "";
      }
  
      String defaultCharset = localeData.defaultCharset();
  
      Locale la = findLocaleAnnotation(juLocale, localeData);
      String localeCharset = null;
      if (la != null) {
        localeCharset = la.charset();
      }
      if (!isEmptyString(localeCharset)) {
        return localeCharset;
      }
  
      return defaultCharset;
    }
  
    static Locale findLocaleAnnotation(java.util.Locale juLocale, LocaleData localeData) {
      Locale[] localeAnnotationArray = localeData.value();
      if (localeAnnotationArray == null) {
        return null;
      }
      for (Locale la : localeAnnotationArray) {
        if (la.value().equals(juLocale.toString())) {
          return la;
        }
      }
      return null;
    }
  
    static boolean isEmptyString(String s) {
      return s == null || s.length() == 0;
    }
  }