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RePlay is a fork of the Play1 framework, created by Codeborne.

There is a newer version: 2.6.2

package play.data.binding;

import java.lang.annotation.Annotation;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import org.apache.commons.lang3.StringUtils;
import play.i18n.Lang;
import play.libs.I18N;

public class AnnotationHelper {

  /**
   * It can be something like As(lang={"fr,de","*"}, value={"dd-MM-yyyy","MM-dd-yyyy"})
   *
   * @param annotations Annotations associated with on the date
   * @param value The formatted date
   * @return null if it cannot be converted because there is no annotation.
   * @throws ParseException if problem occurred during parsing the date
   */
  public static Date getDateAs(Annotation[] annotations, String value) throws ParseException {
    // Look up for the BindAs annotation
    if (annotations == null) {
      return null;
    }
    for (Annotation annotation : annotations) {
      if (annotation.annotationType().equals(As.class)) {
        As as = (As) annotation;
        Locale locale = Lang.getLocale();
        String format = as.value()[0];
        if (!StringUtils.isEmpty(format)) {
          // This can be comma separated
          Tuple tuple = getLocale(as.lang());
          if (tuple != null) {
            // Avoid NPE and get the last value if not specified
            format =
                as.value()[tuple.index < as.value().length ? tuple.index : as.value().length - 1];
            locale = tuple.locale;
          }
        }
        if (StringUtils.isEmpty(format)) {
          format = I18N.getDateFormat();
        }
        SimpleDateFormat sdf =
            locale != null ? new SimpleDateFormat(format, locale) : new SimpleDateFormat(format);
        sdf.setLenient(false);
        return sdf.parse(value);
      }
    }
    return null;
  }

  private static Tuple getLocale(String[] langs) {
    int i = 0;
    for (String l : langs) {
      String[] commaSeparatedLang = l.split(",");
      for (String lang : commaSeparatedLang) {
        if (Lang.get().equals(lang) || "*".equals(lang)) {
          Locale locale = null;
          if ("*".equals(lang)) {
            locale = Lang.getLocale();
          }
          if (locale == null) {
            locale = Lang.getLocale(lang);
          }
          if (locale != null) {
            return new Tuple(i, locale);
          }
        }
      }
      i++;
    }
    return null;
  }

  /** Contains the index of the locale inside the @As */
  private static class Tuple {

    public int index = -1;
    public Locale locale;

    Tuple(int index, Locale locale) {
      this.locale = locale;
      this.index = index;
    }
  }
}