package com.cico.nest.lcdp.boot.web.jackson.core.databind;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;

import java.io.IOException;

/**
 * Long 序列化规则
 *
 * 会将超长 long 值转换为 string，解决前端 JavaScript 最大安全整数是 2^53-1 的问题
 *
 * @author zws
 */
@JacksonStdImpl
public class NumberSerializer extends com.fasterxml.jackson.databind.ser.std.NumberSerializer {

    private static final long MAX_SAFE_INTEGER = 9007199254740991L;
    private static final long MIN_SAFE_INTEGER = -9007199254740991L;

    public static final NumberSerializer INSTANCE = new NumberSerializer(Number.class);

    public NumberSerializer(Class<? extends Number> rawType) {
        super(rawType);
    }

    @Override
    public void serialize(Number value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        // 超出范围 序列化位字符串
        if (value.longValue() > MIN_SAFE_INTEGER && value.longValue() < MAX_SAFE_INTEGER) {
            super.serialize(value, gen, serializers);
        } else {
            gen.writeString(value.toString());
        }
    }
}
