package com.infoloop.tianting.utils;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;

import java.io.IOException;

public class JsonUtil {

    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    static {
        final SimpleModule module = new SimpleModule();
        module.addSerializer(Long.class, ToStringSerializer.instance);
        module.addSerializer(long.class, ToStringSerializer.instance);
        OBJECT_MAPPER.registerModule(module);
        // 如果json中有新增的字段并且是实体类类中不存在的，不报错
        OBJECT_MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 序列化时忽略值为null的属性
        OBJECT_MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    }

    public static String writeAsJson(final Object object) {
        try {
            return OBJECT_MAPPER.writeValueAsString(object);
        } catch (final JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> T readJsonAs(final String json, final Class<T> clazz) {
        try {
            return OBJECT_MAPPER.readerFor(clazz).readValue(json);
        } catch (final IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> T convertValue(final Object object, final Class<T> clazz) {
        return OBJECT_MAPPER.convertValue(object, clazz);
    }

    public static <T> JsonNode readTree(final String json) {
        try {
            return OBJECT_MAPPER.readTree(json);
        } catch (final IOException e) {
            throw new RuntimeException(e);
        }
    }

    private JsonUtil() {
    }
}