Code example for SortedSet

Methods: contains

    protected abstract Object getRawFieldValue(final String fieldName);
    protected boolean isFieldValueSet(final String fieldName) {
        return getFieldNames().contains(fieldName);
    protected abstract boolean isReadOnly(final String fieldName);
    protected void setFields(Map<String, Object> fields) {
        for (final String fieldName : fields.keySet()) {
            setFieldValue(fieldName, fields.get(fieldName));
    protected final Object setFieldValue(final String fieldName, Object newValue) {
        final Object oldFieldValue = getFieldValue(fieldName);
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