@SuppressWarnings("unchecked")
public void addDefaultValue(String className, JSONObject oper) throws Exception {
ObjectMapper defaultValueMapper = ObjectMapperFactory.getOperatorValueSerializer();
Class<? extends Operator> clazz = (Class<? extends Operator>) classLoader.loadClass(className);
if (clazz != null) {
Operator operIns = clazz.newInstance();
String s = defaultValueMapper.writeValueAsString(operIns);
oper.put("defaultValue", new JSONObject(s).get(className));
}
}
public OperatorDiscoverer(String[] jars) {
URL[] urls = new URL[jars.length];
for (int i = 0; i < jars.length; i++) {
pathsToScan.add(jars[i]);
try {
urls[i] = new URL("file://" + jars[i]);
} catch (MalformedURLException ex) {
throw new RuntimeException(ex);
}
}
classLoader = new URLClassLoader(urls, ClassLoader.getSystemClassLoader());
}
@SuppressWarnings("unchecked")
public Class<? extends Operator> getOperatorClass(String className)
throws ClassNotFoundException {
if (CollectionUtils.isEmpty(operatorClassNames)) {
loadOperatorClass();
}
Class<?> clazz = classLoader.loadClass(className);
if (!Operator.class.isAssignableFrom(clazz)) {
throw new IllegalArgumentException("Argument must be a subclass of Operator class");
}
return (Class<? extends Operator>) clazz;
}
public OperatorDiscoverer() {
classLoader = ClassLoader.getSystemClassLoader();
}