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Reflections.java
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Reflections.java
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import com.nqzero.permit.Permit;
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) {
// quiet runtime warnings from JDK9+
Permit.setAccessible(member);
}
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);
}
}