http://github.com/FasterXML/jackson: General data-binding functionality for Jackson: works on core streaming API (FasterXML)
  • Tatu Saloranta
  • Christopher Currie
  • Paul Brown 
package com.fasterxml.jackson.databind.jsontype.impl;

import com.fasterxml.jackson.annotation.JsonTypeInfo.As;

import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;


Type serializer used with As.EXISTING_PROPERTY inclusion mechanism. Expects type information to be a well-defined property on all sub-classes. 
/**
 * Type serializer used with {@link As#EXISTING_PROPERTY} inclusion mechanism.
 * Expects type information to be a well-defined property on all sub-classes.
 */
public class AsExistingPropertyTypeSerializer
    extends AsPropertyTypeSerializer
{
    public AsExistingPropertyTypeSerializer(TypeIdResolver idRes,
            BeanProperty property, String propName)
    {
        super(idRes, property, propName);
    }

    @Override
    public AsExistingPropertyTypeSerializer forProperty(BeanProperty prop) {
        return (_property == prop) ? this :
            new AsExistingPropertyTypeSerializer(_idResolver, prop, _typePropertyName);
    }

    @Override
    public As getTypeInclusion() { return As.EXISTING_PROPERTY; }
}