public static List<Class<?>> getClasses(String folder, String fileName, Class<?> type) {
List<Class<?>> list = new ArrayList<>();
try {
File f = new File(PlaceholderAPIPlugin.getInstance().getDataFolder(), folder);
if (!f.exists()) {
return list;
}
FilenameFilter fileNameFilter = (dir, name) -> {
if (fileName != null) {
return name.endsWith(".jar") && name.replace(".jar", "")
.equalsIgnoreCase(fileName.replace(".jar", ""));
}
return name.endsWith(".jar");
};
File[] jars = f.listFiles(fileNameFilter);
if (jars == null) {
return list;
}
for (File file : jars) {
list = gather(file.toURI().toURL(), list, type);
}
return list;
} catch (Throwable t) {
}
return null;
}