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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 java.lang.reflect.Type;
import java.util.List;

import static com.alibaba.fastjson2.JSONWriter.Feature.BeanToArray;
import static com.alibaba.fastjson2.JSONWriter.Feature.WriteClassName;

public class ObjectWriter2
        extends ObjectWriterAdapter {
    public final FieldWriter fieldWriter0;
    public final FieldWriter fieldWriter1;

    public ObjectWriter2(
            Class objectClass,
            String typeKey,
            String typeName,
            long features,
            List fieldWriters
    ) {
        super(objectClass, typeKey, typeName, features, fieldWriters);
        this.fieldWriter0 = fieldWriters.get(0);
        this.fieldWriter1 = fieldWriters.get(1);
    }

    @Override
    public void write(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
        long featuresAll = features | this.features | jsonWriter.getFeatures();

        if (jsonWriter.jsonb) {
            if ((featuresAll & BeanToArray.mask) != 0) {
                writeArrayMappingJSONB(jsonWriter, object, fieldName, fieldType, features);
                return;
            }

            writeJSONB(jsonWriter, object, fieldName, fieldType, features);
            return;
        }

        if ((featuresAll & BeanToArray.mask) != 0) {
            writeArrayMapping(jsonWriter, object, fieldName, fieldType, features);
            return;
        }

        if (!serializable) {
            if ((featuresAll & JSONWriter.Feature.ErrorOnNoneSerializable.mask) != 0) {
                errorOnNoneSerializable();
                return;
            }

            if ((featuresAll & JSONWriter.Feature.IgnoreNoneSerializable.mask) != 0) {
                jsonWriter.writeNull();
                return;
            }
        }

        if (hasFilter(jsonWriter)) {
            writeWithFilter(jsonWriter, object, fieldName, fieldType, 0);
            return;
        }

        jsonWriter.startObject();

        if (((features | this.features) & WriteClassName.mask) != 0 || jsonWriter.isWriteTypeInfo(object, features)) {
            writeTypeInfo(jsonWriter);
        }

        fieldWriter0.write(jsonWriter, object);
        fieldWriter1.write(jsonWriter, object);

        jsonWriter.endObject();
    }

    @Override
    public final FieldWriter getFieldWriter(long hashCode) {
        if (hashCode == fieldWriter0.hashCode) {
            return fieldWriter0;
        }

        if (hashCode == fieldWriter1.hashCode) {
            return fieldWriter1;
        }

        return null;
    }
}