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Fastjson is a JSON processor (JSON parser + JSON generator) written in Java

There is a newer version: 2.0.53.android8

package com.alibaba.fastjson2.writer;

import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.function.Function;

import java.lang.reflect.Method;
import java.math.BigInteger;

final class FieldWriterBigIntFunc
        extends FieldWriter {
    final Function function;

    FieldWriterBigIntFunc(
            String fieldName,
            int ordinal,
            long features,
            String format,
            String label,
            Method method,
            Function function
    ) {
        super(fieldName, ordinal, features, format, label, BigInteger.class, BigInteger.class, null, method);
        this.function = function;
    }

    @Override
    public Object getFieldValue(T object) {
        return function.apply(object);
    }

    @Override
    public void writeValue(JSONWriter jsonWriter, T object) {
        BigInteger value = (BigInteger) getFieldValue(object);
        jsonWriter.writeBigInt(value, features);
    }

    @Override
    public boolean write(JSONWriter jsonWriter, T o) {
        BigInteger value = function.apply(o);
        if (value == null) {
            long features = this.features | jsonWriter.getFeatures();
            if ((features & JSONWriter.Feature.WriteNulls.mask) == 0) {
                return false;
            }
        }
        writeFieldName(jsonWriter);
        jsonWriter.writeBigInt(value, features);
        return true;
    }
}