package org.andromda.utils;
   
   import org.apache.commons.lang.time.DateUtils;
   
   /**
    * Provides additional methods supporting various date-related features
    */
   public class DateUtilsHelper
       extends DateUtils
  {
      // order is important !
      private static final FormatPattern[] JAVA2PERL_FORMAT_PATTERNS = {new FormatPattern("y{4,}", "%Y"),
          new FormatPattern("y{1,3}", "%y"),
          new FormatPattern("M{4,}", "%B"),
          new FormatPattern("M{3}", "%b"),
          new FormatPattern("M{1,2}", "%m"),
          new FormatPattern("d{4,}", "%A"),
          new FormatPattern("d{3,}", "%a"),
          new FormatPattern("d{2}", "%d"),
          new FormatPattern("d{1}", "%e"),
          new FormatPattern("E{4,}", "%A"),
          new FormatPattern("E{1,3}", "%a"),
          new FormatPattern("H{2,}", "%H"),
          new FormatPattern("H{1}", "%k"),
          new FormatPattern("h{2,}", "%I"),
          new FormatPattern("h{1}", "%l"),
          new FormatPattern("D{3}", "%j"),
          new FormatPattern("s{2,}", "%S"),
          new FormatPattern("s{1}", "%s"),
          new FormatPattern("m{2,}", "%M")};
  
      /**
       * Converts a Java SimpleDateFormat into an equivalent String suited for dates used on Perl/PHP platforms.
       * @param javaFormat
       * @return perl format
       */
      public static String formatJavaToPerl(String javaFormat)
      {
          String perlFormat = null;
  
          if (javaFormat != null)
          {
              perlFormat = javaFormat;
  
              // this implementation is quite rough, and not at all performant, but it works for now
              // @todo (wouter): re-implement
              for (int i = 0; i < JAVA2PERL_FORMAT_PATTERNS.length; i++)
              {
                  final FormatPattern formatPattern = JAVA2PERL_FORMAT_PATTERNS[i];
                  perlFormat = perlFormat.replaceAll(formatPattern.getPattern(), "%%%" + i + "%%%");
              }
  
              for (int i = 0; i < JAVA2PERL_FORMAT_PATTERNS.length; i++)
              {
                  final FormatPattern formatPattern = JAVA2PERL_FORMAT_PATTERNS[i];
                  perlFormat = perlFormat.replaceAll("%%%" + i + "%%%", formatPattern.getReplacement());
              }
          }
  
          return perlFormat;
      }
  
      private static final String[] PERL_TIME_FORMATS = new String[]{"%H", "%I", "%k", "%l", "%p", "%P", "%s", "%S"};
  
      /**
       * Checks whether a perl formatted date contains information about displaying time.
       * @param perlFormat
       * @return true if timeformat
       */
      public static boolean containsTimeFormat(String perlFormat)
      {
          boolean containsTimeFormat = false;
  
          for (int i = 0; i < PERL_TIME_FORMATS.length && !containsTimeFormat; i++)
          {
              String timeFormatPattern = PERL_TIME_FORMATS[i];
              containsTimeFormat = perlFormat.contains(timeFormatPattern);
          }
  
          return containsTimeFormat;
      }
  
      private static final class FormatPattern
      {
          private final String pattern;
          private final String replacement;
  
          public FormatPattern(
              final String formatPattern,
              final String replacement)
          {
              this.pattern = formatPattern;
              this.replacement = replacement;
          }
  
          public String getPattern()
          {
              return pattern;
          }
 
         public String getReplacement()
         {
             return replacement;
         }
     }
 }