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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.JSONException;
import com.alibaba.fastjson2.JSONWriter;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;

class FieldWriterDoubleMethod
        extends FieldWriter {
    protected FieldWriterDoubleMethod(
            String name,
            int ordinal,
            long features,
            String format,
            String label,
            Type fieldType,
            Class fieldClass,
            Field field,
            Method method
    ) {
        super(name, ordinal, features, format, null, label, fieldType, fieldClass, field, method);
    }

    @Override
    public Object getFieldValue(Object object) {
        try {
            return method.invoke(object);
        } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
            throw new JSONException("invoke getter method error, " + fieldName, e);
        }
    }

    @Override
    public boolean write(JSONWriter jsonWriter, T object) {
        Double value;
        try {
            value = (Double) getFieldValue(object);
        } catch (RuntimeException error) {
            if (jsonWriter.isIgnoreErrorGetter()) {
                return false;
            }
            throw error;
        }

        writeFieldName(jsonWriter);

        if (value == null) {
            jsonWriter.writeNumberNull();
        } else {
            double doubleValue = value;
            if (decimalFormat != null) {
                jsonWriter.writeDouble(doubleValue, decimalFormat);
            } else {
                if ((features & JSONWriter.Feature.WriteNonStringValueAsString.mask) != 0) {
                    jsonWriter.writeString(doubleValue);
                } else {
                    jsonWriter.writeDouble(doubleValue);
                }
            }
        }

        return true;
    }

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

        if (value == null) {
            jsonWriter.writeNumberNull();
        } else {
            double doubleValue = value;
            if (decimalFormat != null) {
                jsonWriter.writeDouble(doubleValue, decimalFormat);
            } else {
                jsonWriter.writeDouble(doubleValue);
            }
        }
    }
}