Class StringRenderer

output/java8/1.4.12/StringRenderer.java:45–105

This render knows to perform a few format operations on String objects: upper: Convert to upper case. lower: Convert to lower case. cap: Convert first character to upper case. url-encode: xml-encode:</l

public class StringRenderer implements AttributeRenderer {
    // trim(s) and strlen(s) built-in funcs; these are format options
    @Override
    public String toString(Object o, String formatString, Locale locale) {
        String s = (String)o;
        if ( formatString==null ) return s;
        if ( formatString.equals("upper") ) return s.toUpperCase(locale);
        if ( formatString.equals("lower") ) return s.toLowerCase(locale);
        if ( formatString.equals("cap") ) {
            return (s.length()>0) ? Character.toUpperCase(s.charAt(0))+s.substring(1) : s;
        }
        if ( formatString.equals("url-encode") ) {
            try {
                return URLEncoder.encode(s, "UTF-8");
            }
            catch (UnsupportedEncodingException ex) {
                // UTF-8 is standard, should always be available
            }
        }
        if ( formatString.equals("xml-encode") ) {
            return escapeHTML(s);
        }
        return String.format(locale, formatString, s);
    }

    public static String escapeHTML(String s) {
        if ( s==null ) {
            return null;
        }

        StringBuilder buf = new StringBuilder(s.length());
        int len = s.length();
        for (int i = 0; i< len; i++) {
            char c = s.charAt(i);
            switch ( c ) {
                case '&' :
                    buf.append("&amp;");
                    break;
                case '<' :
                    buf.append("&lt;");
                    break;
                case '>' :
                    buf.append("&gt;");
                    break;
                case '\r' : case '\n' : case '\t' :
                    buf.append(c);
                    break;
                default:
                    boolean control = c<' '; // 32
                    boolean aboveASCII = c>126;
                    if ( control || aboveASCII ) {
                        buf.append("&#");
                        buf.append((int)c);
                        buf.append(";");
                    }
                    else buf.append(c);
            }
        }