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common json interface implements by jackson

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package top.jfunc.json.impl;

import top.jfunc.json.Json;
import top.jfunc.json.JsonArray;
import top.jfunc.json.JsonException;
import top.jfunc.json.JsonObject;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author xiongshiyan at 2018/6/10
 */
public class JSONObject extends BaseMapJSONObject {

    private static final ObjectMapper objectMapper = new ObjectMapper();

    public JSONObject(Map map){
        super(map);
    }
    public JSONObject(){
        super();
    }
    public JSONObject(String jsonString){
        super(jsonString);
    }

    @Override
    protected Map str2Map(String jsonString) {
        try {
            return objectMapper.readValue(jsonString , Map.class);
        } catch (IOException e) {
            throw new JsonException(e);
        }
    }

    @Override
    public JsonObject getJsonObject(String key) {
        assertKey(key);
        //这里不能使用getJSONObject，因为每一种Json实现不一样，给出的JsonObject类型是不一致的。
        //这里就是各种JsonObject不能混用的原因
        Object temp = this.map.get(key);
        Object t = checkNullValue(key, temp);

        if(t instanceof Map){
            return new JSONObject((Map) t);
        }

        return (JsonObject) t;
    }

    @Override
    public JsonArray getJsonArray(String key) {
        assertKey(key);
        //这里不能使用getJSONObject，因为每一种Json实现不一样，给出的JsonObject类型是不一致的。
        //这里就是各种JsonObject不能混用的原因
        Object temp = this.map.get(key);
        Object t = checkNullValue(key, temp);

        if(t instanceof List){
            return new JSONArray((List