package com.buckosoft.PicMan.service.support;

 import java.util.Collection;

 import com.fasterxml.jackson.databind.AnnotationIntrospector;

 import com.fasterxml.jackson.databind.BeanDescription;

 import com.fasterxml.jackson.databind.JavaType;

 import com.fasterxml.jackson.databind.SerializationConfig;

 import com.fasterxml.jackson.databind.introspect.AnnotatedClass;

 import com.fasterxml.jackson.databind.jsontype.NamedType;

 import com.fasterxml.jackson.databind.jsontype.TypeResolverBuilder;

 import com.fasterxml.jackson.databind.jsontype.TypeSerializer;

 public class JsonUtils {

         private JsonUtils() {

         }

         public static TypeSerializer createTypeSerializer(

                         SerializationConfig config, JavaType baseType) {

                 BeanDescription bean = config.introspectClassAnnotations(baseType

                                 .getRawClass());

                 AnnotatedClass ac = bean.getClassInfo();

                 AnnotationIntrospector ai = config.getAnnotationIntrospector();

                 TypeResolverBuilder<?> b = ai.findTypeResolver(config, ac, baseType);

                 /*

                  * Ok: if there is no explicit type info handler, we may want to use a

                  * default. If so, config object knows what to use.

                  */

                 Collection<NamedType> subtypes = null;

                 if (b == null) {

                         b = config.getDefaultTyper(baseType);

                 } else {

                         subtypes = config.getSubtypeResolver().collectAndResolveSubtypes(

                                         ac, config, ai);

                 }

                 if (b == null) {

                         return null;

                 }

                 return b.buildTypeSerializer(config, baseType, subtypes);

         }

 }