}

    /**
     * Access method for the role property.
     *
     * @return the current value of the role property
     */
    public String getRole() {
        String retValue = null;

        if (roles != null && !roles.isEmpty()) {
            StringBuilder builder = new StringBuilder();
            Iterator<String> roleIt = roles.iterator();
            if (roleIt.hasNext()) {
                builder.append(roleIt.next());
                while (roleIt.hasNext()) {
                    builder.append(",");
                    builder.append(roleIt.next());
                }
                retValue = builder.toString();
            }
        }

        return retValue;
    }

    /**
     * Returns the roles that can render this attribute.
     *
     * @return The enabled roles.
     * @since 2.0.6
     */
    public Set<String> getRoles() {
        return roles;
    }

    /**
     * Sets the value of the role property.
     *
     * @param role the new value of the role property
     */
    public void setRole(String role) {
        if (role != null && role.trim().length() > 0) {
            String[] rolesStrings = role.split("\\s*,\\s*");
            roles = new HashSet<String>();
            for (int i = 0; i < rolesStrings.length; i++) {
                roles.add(rolesStrings[i]);
            }
        } else {
            roles = null;
        }
    }

    /**
     * Sets the roles that can render this attribute.
     *
     * @param roles The enabled roles.
     * @since 2.0.6
     */
    public void setRoles(Set<String> roles) {
        this.roles = roles;
    }

    /**
     * Access method for the attributes property.
     * If there is no attributes, return an empty map.
     *
     * @return the current value of the attributes property
     */
    public Map<String, Attribute> getAttributes() {