EditorMimeTypes.java 文件源码

private EditorMimeTypes() {
    impl = Lookup.getDefault().lookup(EditorMimeTypesImplementation.class);
    if (impl == null) {
        throw new IllegalStateException(String.format(
            "No %s instance in the default Lookup.",    //NOI18N
            EditorMimeTypesImplementation.class));
    }
    listeners = new PropertyChangeSupport(this);
    listener = new PropertyChangeListener() {
        @Override
        public void propertyChange(PropertyChangeEvent evt) {
            if (EditorMimeTypesImplementation.PROP_SUPPORTED_MIME_TYPES.equals(evt.getPropertyName())) {
                listeners.firePropertyChange(PROP_SUPPORTED_MIME_TYPES, null, null);
            }
        }
    };
    impl.addPropertyChangeListener(WeakListeners.propertyChange(listener, impl));
}