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Jackson (https://github.com/FasterXML/jackson) extension module used to enhance performance using bytecode generation to replace use of Reflection for field access and method calls

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package com.fasterxml.jackson.module.afterburner.deser;

import java.util.*;

import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.*;

public class SuperSonicDeserializerBuilder extends BeanDeserializerBuilder
{
    public SuperSonicDeserializerBuilder(BeanDeserializerBuilder base) {
        super(base);
    }

    @Override
    public JsonDeserializer build() throws JsonMappingException

    {
        BeanDeserializer deser = (BeanDeserializer) super.build();
        // only create custom one, if existing one is standard deserializer;
        if (deser.getClass() == BeanDeserializer.class) {
            BeanDeserializer beanDeser = (BeanDeserializer) deser;
            Iterator it = getProperties();
            // also: only build custom one for non-empty beans:
            if (it.hasNext()) {
                // So let's find actual order of properties, necessary for optimal access
                ArrayList props = new ArrayList();
                do {
                    props.add(it.next());
                } while (it.hasNext());
                return new SuperSonicBeanDeserializer(beanDeser, props);
            }
        }
        return deser;
    }
}