gov.va.vinci.leo.tools

Class LeoInheritanceGsonAdapter<T>

java.lang.Object

gov.va.vinci.leo.tools.LeoInheritanceGsonAdapter<T>

Type Parameters:

T - Generic type template for extending classes. User: Thomas Ginter Date: 8/15/14 Time: 11:54

All Implemented Interfaces:

com.google.gson.JsonDeserializer<T>, com.google.gson.JsonSerializer<T>

public class LeoInheritanceGsonAdapter<T>
extends Object
implements com.google.gson.JsonSerializer<T>, com.google.gson.JsonDeserializer<T>

Adds the class type name to the json output so that deserialization will invoke the correct constructor within a class hierarchy.

Constructor Summary

Constructors

Constructor and Description
LeoInheritanceGsonAdapter()

Method Summary

Modifier and Type	Method and Description
T	deserialize(com.google.gson.JsonElement json, Type typeOfT, com.google.gson.JsonDeserializationContext context) Gson invokes this call-back method during deserialization when it encounters a field of the specified type.
com.google.gson.JsonElement	serialize(T src, Type typeOfSrc, com.google.gson.JsonSerializationContext context) Gson invokes this call-back method during serialization when it encounters a field of the specified type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LeoInheritanceGsonAdapter

public LeoInheritanceGsonAdapter()

Method Detail

deserialize

public T deserialize(com.google.gson.JsonElement json,
                     Type typeOfT,
                     com.google.gson.JsonDeserializationContext context)
              throws com.google.gson.JsonParseException

Gson invokes this call-back method during deserialization when it encounters a field of the specified type.

In the implementation of this call-back method, you should consider invoking JsonDeserializationContext.deserialize(com.google.gson.JsonElement, java.lang.reflect.Type) method to create objects for any non-trivial field of the returned object. However, you should never invoke it on the the same type passing json since that will cause an infinite loop (Gson will call your call-back method again).

Specified by:

deserialize in interface com.google.gson.JsonDeserializer<T>

Parameters:

json - The Json data being deserialized

typeOfT - The type of the Object to deserialize to

context -

Returns:

a deserialized object of the specified type typeOfT which is a subclass of T

Throws:

com.google.gson.JsonParseException - if json is not in the expected format of typeofT

serialize

public com.google.gson.JsonElement serialize(T src,
                                             Type typeOfSrc,
                                             com.google.gson.JsonSerializationContext context)

Gson invokes this call-back method during serialization when it encounters a field of the specified type.

In the implementation of this call-back method, you should consider invoking JsonSerializationContext.serialize(Object, java.lang.reflect.Type) method to create JsonElements for any non-trivial field of the src object. However, you should never invoke it on the src object itself since that will cause an infinite loop (Gson will call your call-back method again).

Specified by:

serialize in interface com.google.gson.JsonSerializer<T>

Parameters:

src - the object that needs to be converted to Json.

typeOfSrc - the actual type (fully genericized version) of the source object.

context -

Returns:

a JsonElement corresponding to the specified object.