public static T createInstance()

in presto-pulsar/src/main/java/org/apache/pulsar/sql/presto/PulsarConnectorUtils.java [54:79]

• 26 lines of code
• 7 McCabe index (conditional complexity)

    public static <T> T createInstance(String userClassName,
                                       Class<T> xface,
                                       ClassLoader classLoader) {
        Class<?> theCls;
        try {
            theCls = Class.forName(userClassName, true, classLoader);
        } catch (ClassNotFoundException | NoClassDefFoundError cnfe) {
            throw new RuntimeException("User class must be in class path", cnfe);
        }
        if (!xface.isAssignableFrom(theCls)) {
            throw new RuntimeException(userClassName + " not " + xface.getName());
        }
        Class<T> tCls = (Class<T>) theCls.asSubclass(xface);
        try {
            Constructor<T> meth = tCls.getDeclaredConstructor();
            return meth.newInstance();
        } catch (InstantiationException ie) {
            throw new RuntimeException("User class must be concrete", ie);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException("User class must have a no-arg constructor", e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException("User class must a public constructor", e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException("User class constructor throws exception", e);
        }
    }