protected Expression instantiate(Object oldInstance,
    Encoder out) 
{
        Font font = (Font) oldInstance;
        int count = 0;
        String family = null;
        int style = Font.PLAIN;
        int size = 12;
        Map basic = font.getAttributes();
        Map clone = new HashMap(basic.size());
        for (Object key : basic.keySet()) {
            Object value = basic.get(key);
            if (value != null) {
                clone.put(key, value);
            }
            if (key == TextAttribute.FAMILY) {
                if (value instanceof String) {
                    count++;
                    family = (String) value;
                }
            }
            else if (key == TextAttribute.WEIGHT) {
                if (TextAttribute.WEIGHT_REGULAR.equals(value)) {
                    count++;
                } else if (TextAttribute.WEIGHT_BOLD.equals(value)) {
                    count++;
                    style |= Font.BOLD;
                }
            }
            else if (key == TextAttribute.POSTURE) {
                if (TextAttribute.POSTURE_REGULAR.equals(value)) {
                    count++;
                } else if (TextAttribute.POSTURE_OBLIQUE.equals(value)) {
                    count++;
                    style |= Font.ITALIC;
                }
            } else if (key == TextAttribute.SIZE) {
                if (value instanceof Number) {
                    Number number = (Number) value;
                    size = number.intValue();
                    if (size == number.floatValue()) {
                        count++;
                    }
                }
            }
        }
        Class type = font.getClass();
        if (count == clone.size()) {
            return new Expression(font, type, "new", new Object[]{family, style, size});
        }
        if (type == Font.class) {
            return new Expression(font, type, "getFont", new Object[]{clone});
        }
        return new Expression(font, type, "new", new Object[]{Font.getFont(clone)});
}

 protected boolean mutatesTo(Object oldInstance,
    Object newInstance) 
{
        return oldInstance.equals(newInstance);
}