code: public static String convert(String text) {
          StringBuilder builder = new StringBuilder();
          boolean single_context = false;
          for (int i = 0; i < text.length(); i++) {
              char ch = text.charAt(i);
              if (ch == '\\') {
                  i = i + 1;
                  if (i < text.length()) {
                      ch = text.charAt(i);
                      if (!(single_context && ch == '\'')) {
                          // unescape ' inside single quotes
                          builder.append('\\');
                      }
                  }
              } else if (ch == '\'') {
                  // Turn ' into ", for proper string
                  ch = '"';
                  single_context = ! single_context;
              }
              builder.append(ch);
          }
  
          return builder.toString();
      }
docs: Reads the input text with possible single quotes as delimiters
  and returns a String correctly formatted.
  <p>For convenience, single quotes as well as double quotes
  are allowed to delimit strings. If single quotes are
  used, any quotes, single or double, in the string must be
  escaped (prepend with a '\').
  
  @param text the input data
  @return String without single quotes