@Override
public <T> T getProperty(CssType<T> type, CssPropertyKey property) {
if (rule == null) {
return null;
} else {
return rule.getProperty(type, property);
}
}
@Override
public void removeRuleContentListener(CssRuleContentListener listener) {
listeners.remove(listener);
if (listeners.isEmpty()) {
if (rule != null) {
rule.removeRuleContentListener(forwardListener);
}
}
}
@Override
public void addRuleContentListener(CssRuleContentListener listener) {
if (listener == null) {
throw new IllegalArgumentException("listener must not be null");
}
if (listeners.isEmpty()) {
if (rule != null) {
rule.addRuleContentListener(forwardListener);
}
}
listeners.add(listener);
}