mqtt/src/main/java/com/xydl/util/FormatUtil.java

package com.xydl.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.sql.Timestamp;
import java.util.*;
import java.util.stream.Collectors;

public class FormatUtil {

    public static String mqttFormatTransform(List<Map<String,Object>> list, Map<String,String> fieldMap){
        ObjectMapper objectMapper = new ObjectMapper();

        Map<String,Object> resultMap = new HashMap<String,Object>(){{
            put("AssetList",list.stream().map(e -> recordTransform(e,fieldMap)).collect(Collectors.toList()));
        }};

        String jsonString = null;
        try {
            jsonString = objectMapper.writeValueAsString(resultMap);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
        return jsonString;
    }

    public static Map<String,Object> recordTransform(Map<String, Object> record, Map<String, String> fieldMap){
        Map<String,Object> mqttRecord = new TreeMap<>();
        List<Map<String,Object>> attribuiteList = new ArrayList<>();
        for(String key : record.keySet()){
            if(fieldMap.containsKey(key)){
                attribuiteList.add(new HashMap<String,Object>(){{
                    put("AttributeCode", fieldMap.get(key));
                    put("DataValue",record.get(key));
                }});
            }
        }
        mqttRecord.put("AssetCode",record.get("sensorid"));
        mqttRecord.put("AttributeList",attribuiteList);
        String captureTime = record.get("d_time") !=null ? (String) record.get("d_time") : (String) record.get("capturetime");
        mqttRecord.put("Timestamp",Timestamp.valueOf(captureTime).getTime());

         return  mqttRecord;
    }


//    private static List<Map<String,Object>> transformFieldForList(Map<String, String> fieldMap, List<Map<String, Object>> oriFieldList) {
//        List<Map<String,Object>> newDeviceIDData = new ArrayList<>();
//        for(Map<String,Object> fieldValueMap : oriFieldList){
//            newDeviceIDData.add(transformOneRecord(fieldMap,fieldValueMap));
//        }
//        return newDeviceIDData;
//    }
//
//    private static Map<String,Object> transformOneRecord(Map<String, String> fieldMap, Map<String, Object> fieldValueMap) {
//        Map<String,Object> newFieldValueMap = new HashMap<>();
//        for(String field : fieldMap.keySet()){
//            if(fieldValueMap.containsKey(field)){
//                newFieldValueMap.put(fieldMap.get(field),fieldValueMap.get(field) );
//            }
//        }
//        return newFieldValueMap;
//    }

//    public static void main(String[] args) {
//        System.out.println(Timestamp.valueOf("2022-05-01 12:11:00").getTime());
//        System.out.println(new Timestamp(new Date(Timestamp.valueOf("2022-05-01 12:11:00").getTime()).getTime()));
//    }


}