import org.junit.Test;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;

public class DtoDiffTest {

    @Test
    public void DTO비교하기() throws IntrospectionException {
        ExtendedUser user1 = new ExtendedUser("이름1", "이메일1", 10);
        ExtendedUser user2 = new ExtendedUser("이름2", "이메일1", 20);

        diff(user1, user2, ExtendedUser.class);
        // result
        // age의 값이 다름. value1 : 10, value2 : 20
        // name의 값이 다름. value1 : 이름1, value2 : 이름2
    }

    public static <T> void diff(T target1, T target2, Class<T> targetClass) {
        try {
            for (PropertyDescriptor pd : Introspector.getBeanInfo(targetClass, Object.class).getPropertyDescriptors()) {
                Object value1 = pd.getReadMethod().invoke(target1);
                Object value2 = pd.getReadMethod().invoke(target2);

                boolean isNotEqualValue = !value1.equals(value2);
                if (isNotEqualValue) {
                    System.out.println(String.format("%s의 값이 다름. value1 : %s, value2 : %s", pd.getName(), value1, value2));
                }
            }
        } catch (IntrospectionException | InvocationTargetException | IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    public static class User {
        private String name;
        private String email;

        public User(String name, String email) {
            this.name = name;
            this.email = email;
        }

        // getter, setter
    }


    public static class ExtendedUser extends User {
        private int age;

        public ExtendedUser(String name, String email, int age) {
            super(name, email);
            this.age = age;
        }
        // getter, setter
    }

}