PluginLoader.java 文件源码

/**
 * Attempts to load a plugin class. This class may or not be a plugin; only a plugin class will be loaded. A plugin
 * loaded with this method will be loaded after unloading a plugin that shares the same
 * {@link Plugin#idString() ID string}, if one exists.
 *
 * @param clazz the class to attempt to load
 *
 * @return true if the class is a plugin class and was successfully loaded; false otherwise
 */
public boolean loadPluginClass(Class<? extends Plugin> clazz) {
  if (Plugin.class.isAssignableFrom(clazz) && !Modifier.isAbstract(clazz.getModifiers())) {
    try {
      Plugin.validatePluginClass(clazz);
      if (Modifier.isPublic(clazz.getConstructor().getModifiers())) {
        Plugin plugin = clazz.newInstance();
        load(plugin);
        return true;
      }
    } catch (ReflectiveOperationException | InvalidPluginDefinitionException e) {
      log.log(Level.WARNING, "Could not load plugin class", e);
      return false;
    }
  }
  return false;
}