gobblin.util.io

Class GsonInterfaceAdapter

java.lang.Object

gobblin.util.io.GsonInterfaceAdapter

Type Parameters:

T - The interface or abstract type to be serialized and deserialized with Gson.

All Implemented Interfaces:

com.google.gson.TypeAdapterFactory

public class GsonInterfaceAdapter
extends Object
implements com.google.gson.TypeAdapterFactory

A Gson interface adapter that makes it possible to serialize and deserialize polymorphic objects.

This adapter will capture all instances of baseClass and write them as {"object-type":"class.name", "object-data":"data"}, allowing for correct serialization and deserialization of polymorphic objects. The following types will not be captured by the adapter (i.e. they will be written by the default GSON writer): - Primitives and boxed primitives - Arrays - Collections - Maps Additionally, generic classes (e.g. class MyClass) cannot be correctly decoded.

To use:

          
            MyClass object = new MyClass();
            Gson gson = GsonInterfaceAdapter.getGson(MyBaseClass.class);
            String json = gson.toJson(object);
            Myclass object2 = gson.fromJson(json, MyClass.class);
          
    

Note: a useful case is GsonInterfaceAdapter.getGson(Object.class), which will correctly serialize / deserialize all types except for java generics.

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	OBJECT_DATA
protected static String	OBJECT_TYPE

Constructor Summary

Constructors

Constructor and Description
GsonInterfaceAdapter()

Method Summary

Modifier and Type	Method and Description
<R> com.google.gson.TypeAdapter<R>	create(com.google.gson.Gson gson, com.google.gson.reflect.TypeToken<R> type)
static <T> com.google.gson.Gson	getGson(Class<T> clazz)

Methods inherited from class java.lang.Object

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

Field Detail

OBJECT_TYPE

protected static final String OBJECT_TYPE

See Also:

Constant Field Values

OBJECT_DATA

protected static final String OBJECT_DATA

See Also:

Constant Field Values

Constructor Detail

GsonInterfaceAdapter

public GsonInterfaceAdapter()

Method Detail

create

public <R> com.google.gson.TypeAdapter<R> create(com.google.gson.Gson gson,
                                                 com.google.gson.reflect.TypeToken<R> type)

Specified by:

create in interface com.google.gson.TypeAdapterFactory

getGson

public static <T> com.google.gson.Gson getGson(Class<T> clazz)