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There is a newer version: 2.1.5

package com.anwen.mongo.convert;

import com.anwen.mongo.cache.global.PropertyCache;
import com.anwen.mongo.toolkit.InstantUtil;
import com.anwen.mongo.toolkit.StringUtils;

import java.util.Date;
import java.util.Map;
import java.util.stream.Collectors;

public class Converter {

    public static Map convertKeysToCamelCase(Map map) {
        return map.entrySet().stream()
                .collect(Collectors.toMap(
                        entry -> convertToCamelCaseIfNeeded(entry.getKey()),
                        entry -> convertValue(entry.getValue())
                ));
    }

    private static String convertToCamelCaseIfNeeded(String key) {
        return PropertyCache.camelToUnderline ? StringUtils.convertToCamelCase(key) : key;
    }

    private static Object convertValue(Object value) {
        if (value instanceof Date) {
            return InstantUtil.convertTimestampToLocalDateTime8(((Date) value).toInstant());
        }
        return value;
    }
}