FreelanceBot

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package telegramBot.util;
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import telegramBot.dto.OrderDto;
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import telegramBot.entity.Order;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.stream.Collectors;
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public class OrderUtil {
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    public static OrderDto toDto(Order order){
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        String title = order.getTitle();
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        String link = order.getLink();
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        String exchangeName = order.getExchange().getName();
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        String exchangeLink = order.getExchange().getLink();
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        String subscription = order.getSubscription().getLanguage();
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        return new OrderDto(title, link, exchangeName, exchangeLink, subscription);
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    }
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    public static List<OrderDto> toDtos(List<Order> orders) {
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        List<OrderDto> result = new ArrayList<>();
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        for (Order order : orders) {
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            result.add(toDto(order));
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        }
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        return result.stream()
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                .filter(distinctByKey(OrderDto::getLink))
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                .collect(Collectors.toList());
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    }
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    public static <T> Predicate<T> distinctByKey(Function<? super T, ?> keyExtractor) {
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        Set<Object> seen = ConcurrentHashMap.newKeySet();
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        return t -> seen.add(keyExtractor.apply(t));
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    }
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}
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