/*
    *  Versioning:
    *  $LastChangedDate: 2012-10-15 20:41:00 +0200 (Mo, 15 Okt 2012) $
    *  $LastChangedRevision: 328 $
    */
   package org.jcr_blog.service;
   
   import java.text.CharacterIterator;
   import java.text.SimpleDateFormat;
  import java.text.StringCharacterIterator;
  import java.util.Date;
  
  /**
   *
   * @author Sebastian Prehn <sebastian.prehn@planetswebdesign.de>
   */
  public class ResourceHelper {
  
      private static final SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssZ");
  
      /*
       * ResourceNames shall be valid xml localnames, and valid encoded URLs.
       * So we eliminate all special characters and any whitespace.
       */
      private static final char LITERAL_PREFIX_DELIMITER = ':';
      private static final char LITERAL_LBRACE = '[';
      private static final char LITERAL_RBRACE = ']';
      private static final char LITERAL_SLASH = '/';
      private static final char LITERAL_ASTERISK = '*';
      private static final char LITERAL_SQUOTE = '\'';
      private static final char LITERAL_QUOTE = '"';
      private static final char LITERAL_PIPE = '|';
      private static final char LITERAL_DOT = '.';
      private static final char LITERAL_EXSLAMATIONMARK = '!';
      private static final char LITERAL_QUESTIONMARK = '?';
      private static final char LITERAL_EQUAL = '=';
      
  
      /**
       *
       * @param d
       * @param name none-empty string
       * @return
       */
      public static String createResourceName(Date d, String name) {
          assert (name != null);
          assert (d != null);
          String str = name.trim().toLowerCase().replaceAll("(\\s)+", "-");
          str = removeLiterals(str);
          return new StringBuilder().append(format.format(d)).append('-').append(str).toString();
      }
  
      private static String removeLiterals(String parameter) {
          final StringBuilder result = new StringBuilder();
          final StringCharacterIterator iterator = new StringCharacterIterator(parameter);
          char character = iterator.current();
          while (character != CharacterIterator.DONE) {
              switch (character) {
                  case LITERAL_PREFIX_DELIMITER:
                  case LITERAL_LBRACE:
                  case LITERAL_RBRACE:
                  case LITERAL_SLASH:
                  case LITERAL_ASTERISK:
                  case LITERAL_SQUOTE:
                  case LITERAL_QUOTE:
                  case LITERAL_PIPE:
                  case LITERAL_DOT:
                  case LITERAL_EXSLAMATIONMARK:
                  case LITERAL_QUESTIONMARK:
                  case LITERAL_EQUAL:
                      // skip character
                      break;
                  default:
                      //the char is not a special one
                      //add it to the result as is
                      result.append(character);
              }
              character = iterator.next();
          }
          return result.toString();
      }
  }