package com.usky.config;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class CollectionUtils {
    public CollectionUtils() {
    }

    public static <T> List<T> removeDuplicatesByField(List<T> list, String fieldName) throws NoSuchFieldException, IllegalAccessException {
        if (list != null && !list.isEmpty() && fieldName != null && !fieldName.isEmpty()) {
            Map<Object, T> map = new HashMap();

            for(T item : list) {
                Field field = item.getClass().getDeclaredField(fieldName);
                field.setAccessible(true);
                Object fieldValue = field.get(item);
                map.putIfAbsent(fieldValue, item);
            }

            return new ArrayList(map.values());
        } else {
            return list;
        }
    }
}