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This project aims to provide an easy tool to visualize data flow and objects within the JVM. It is intended for students that are starting to learn programming with Java.

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package me.ruebner.jvisualizer.backend.vm.json;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import me.ruebner.jvisualizer.backend.vm.values.NullValue;
import me.ruebner.jvisualizer.backend.vm.values.ReferenceValue;

import java.io.IOException;

/**
 * This is a custom serializer to convert a {@link ReferenceValue} to JSON.
 */
public class ReferenceValueSerializer extends JsonSerializer {

    @Override
    public void serialize(ReferenceValue value, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        if (value instanceof NullValue nullValue) {
            jsonGenerator.writeObject(nullValue);
        } else {
            jsonGenerator.writeStartObject();
            jsonGenerator.writeNumberField("reference", value.getId());
            jsonGenerator.writeEndObject();
        }
    }
}