package utils;

import sun.reflect.ReflectionFactory;

import java.lang.reflect.AccessibleObject;

import java.lang.reflect.Constructor;

import java.lang.reflect.Field;

import java.lang.reflect.InvocationTargetException;

@SuppressWarnings("restriction")

public class Reflections {

public static void setAccessible(AccessibleObject member) {

String versionStr = System.getProperty("java.version");

int javaVersion = Integer.parseInt(versionStr.split("\\.")[0]);

member.setAccessible(true);

}

public static Field getField(final Class<?> clazz, final String fieldName) {

Field field = null;

try {

field = clazz.getDeclaredField(fieldName);

setAccessible(field);

} catch (NoSuchFieldException ex) {

if (clazz.getSuperclass() != null)

field = getField(clazz.getSuperclass(), fieldName);

}

return field;

}

public static void setFieldValue(final Object obj, final String fieldName, final Object value) throws Exception {

final Field field = getField(obj.getClass(), fieldName);

field.set(obj, value);

}

public static Object getFieldValue(final Object obj, final String fieldName) throws Exception {

final Field field = getField(obj.getClass(), fieldName);

return field.get(obj);

}

public static Constructor<?> getFirstCtor(final String name) throws Exception {

final Constructor<?> ctor = Class.forName(name).getDeclaredConstructors()[0];

setAccessible(ctor);

return ctor;

}

public static Object newInstance(String className, Object... args) throws Exception {

return getFirstCtor(className).newInstance(args);

}

public static <T> T createWithoutConstructor(Class<T> classToInstantiate)

throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {

return createWithConstructor(classToInstantiate, Object.class, new Class[0], new Object[0]);

}

@SuppressWarnings({"unchecked"})

public static <T> T createWithConstructor(Class<T> classToInstantiate, Class<? super T> constructorClass, Class<?>[] consArgTypes, Object[] consArgs)

throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {

Constructor<? super T> objCons = constructorClass.getDeclaredConstructor(consArgTypes);

setAccessible(objCons);

Constructor<?> sc = ReflectionFactory.getReflectionFactory().newConstructorForSerialization(classToInstantiate, objCons);

setAccessible(sc);

return (T) sc.newInstance(consArgs);

}

}