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

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package com.alibaba.fastjson2.writer;

import com.alibaba.fastjson2.JSONWriter;

import java.lang.reflect.Field;
import java.util.Date;

final class FieldWriterDateField
        extends FieldWriterDate {
    protected FieldWriterDateField(
            String fieldName,
            int ordinal,
            long features,
            String format,
            String label,
            Field field
    ) {
        super(fieldName, ordinal, features, format, label, Date.class, Date.class, field, null);
    }

    @Override
    public void writeValue(JSONWriter jsonWriter, T object) {
        Date value = (Date) getFieldValue(object);

        if (value == null) {
            jsonWriter.writeNull();
            return;
        }
        writeDate(jsonWriter, false, value.getTime());
    }

    @Override
    public boolean write(JSONWriter jsonWriter, T object) {
        Date date = (Date) getFieldValue(object);

        if (date == null) {
            long features = this.features | jsonWriter.getFeatures();
            if ((features & JSONWriter.Feature.WriteNulls.mask) != 0) {
                writeFieldName(jsonWriter);
                jsonWriter.writeNull();
                return true;
            } else {
                return false;
            }
        }

        writeDate(jsonWriter, date.getTime());
        return true;
    }
}