VoidForum/src/main/java/ru/bvn13/voidforum/utils/DTOUtil.java

package ru.bvn13.voidforum.utils;

import org.hibernate.Hibernate;
import org.hibernate.proxy.HibernateProxy;
import org.modelmapper.ModelMapper;
import org.modelmapper.convention.MatchingStrategies;

import java.util.ArrayList;
import java.util.List;

/**
 * @author bvn13 <mail4bvn@gmail.com>
 */
public class DTOUtil {

    private static ModelMapper MAPPER = null;

    private static ModelMapper getMapper(){
        if(MAPPER == null){
            MAPPER = new ModelMapper();
            MAPPER.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT);
        }

        return MAPPER;
    }

    public static <S, T> T map(S source, Class<T> targetClass) {
        return getMapper().map(source, targetClass);
    }

    public static <S, T> void mapTo(S source, T dist) {
        getMapper().map(source, dist);
    }

    public static <S, T> List<T> mapList(List<S> source, Class<T> targetClass) {
        List<T> list = new ArrayList<>();
        for (S s : source) {
            list.add(getMapper().map(s, targetClass));
        }
        return list;
    }

    public static <T> T initializeAndUnproxy(T entity) {
        if (entity == null) {
            throw new
                    NullPointerException("Entity passed for initialization is null");
        }

        Hibernate.initialize(entity);
        if (entity instanceof HibernateProxy) {
            entity = (T) ((HibernateProxy) entity).getHibernateLazyInitializer().getImplementation();
        }
        return entity;
    }
}