code: private static String unescapeLiteral(final String text) {
  
          if (text == null) {
              return null;
          }
  
          StringBuilder strBuilder = null;
  
          final int max = text.length();
  
          int readOffset = 0;
          int referenceOffset = 0;
  
          char c;
  
          for (int i = 0; i < max; i++) {
  
              c = text.charAt(i);
  
              /*
               * Check the need for an unescape operation at this point
               */
  
              if (c != ESCAPE_PREFIX || (i + 1) >= max) {
                  continue;
              }
  
              if (c == ESCAPE_PREFIX) {
  
                  switch (text.charAt(i + 1)) {
                      case '\'': c = '\''; referenceOffset = i + 1; break;
                      case '\\': c = '\\'; referenceOffset = i + 1; break;
                      // We weren't able to consume any valid escape chars, just not consider it an escape operation
                      default: referenceOffset = i; break;
                  }
  
              }
  
  
              /*
               * At this point we know for sure we will need some kind of unescape, so we
               * can increase the offset and initialize the string builder if needed, along with
               * copying to it all the contents pending up to this point.
               */
  
              if (strBuilder == null) {
                  strBuilder = new StringBuilder(max + 5);
              }
  
              if (i - readOffset > 0) {
                  strBuilder.append(text, readOffset, i);
              }
  
              i = referenceOffset;
              readOffset = i + 1;
  
              /*
               * Write the unescaped char
               */
              strBuilder.append(c);
  
          }
  
  
          /*
           * -----------------------------------------------------------------------------------------------
           * Final cleaning: return the original String object if no unescape was actually needed. Otherwise
           *                 append the remaining escaped text to the string builder and return.
           * -----------------------------------------------------------------------------------------------
           */
  
          if (strBuilder == null) {
              return text;
          }
  
          if (max - readOffset > 0) {
              strBuilder.append(text, readOffset, max);
          }
  
          return strBuilder.toString();
  
      }
docs: /*
  This unescape operation will perform two transformations:
  \' -> '
  \\ -> \