좋습니다, 해결책을위한 (작동중인) 스텁입니다. 이탈리아에서 너무 늦어서 더 좋지 않습니다.
이
package com.google.gson.graph;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* @author Giacomo Tesio
*/
public class InterfaceAdapterFactory implements TypeAdapterFactory {
final Map<String, GenericFunction<Gson, TypeAdapter<?>>> adapters;
private final Class<?> commonInterface;
public InterfaceAdapterFactory(Class<?> commonInterface, Class<?>[] concreteClasses)
{
this.commonInterface = commonInterface;
this.adapters = new HashMap<String, GenericFunction<Gson, TypeAdapter<?>>>();
final TypeAdapterFactory me = this;
for(int i = 0; i < concreteClasses.length; ++i)
{
final Class<?> clazz = concreteClasses[i];
this.adapters.put(clazz.getName(), new GenericFunction<Gson, TypeAdapter<?>>(){
public TypeAdapter<?> map(Gson gson) {
TypeToken<?> type = TypeToken.get(clazz);
return gson.getDelegateAdapter(me, type);
}
});
}
}
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
if(!this.commonInterface.isAssignableFrom(type.getRawType())
&& !this.commonInterface.equals(type.getRawType()))
{
return delegate;
}
final TypeToken<T> typeToken = type;
final Gson globalGson = gson;
return new TypeAdapter<T>() {
public void write(JsonWriter out, T value) throws IOException {
out.beginObject();
out.name("@t");
out.value(value.getClass().getName());
out.name("@v");
delegate.write(out, value);
out.endObject();
}
@SuppressWarnings({"unchecked"})
public T read(JsonReader in) throws IOException {
JsonToken peekToken = in.peek();
if(peekToken == JsonToken.NULL) {
in.nextNull();
return null;
}
in.beginObject();
String dummy = in.nextName();
String typeName = in.nextString();
dummy = in.nextName();
TypeAdapter<?> specificDelegate = adapters.get(typeName).map(globalGson);
T result = (T)specificDelegate.read(in);
in.endObject();
return result;
}
};
}
}
이
public final class InterfaceAdapterFactoryTest extends TestCase {
public void testInterfaceSerialization1(){
SampleInterface first = new SampleImplementation1(10);
SampleInterfaceContainer toSerialize = new SampleInterfaceContainer("container", first);
GsonBuilder gsonBuilder = new GsonBuilder();
new GraphAdapterBuilder()
.addType(SampleInterfaceContainer.class)
.addType(SampleImplementation1.class)
.addType(SampleImplementation2.class)
.registerOn(gsonBuilder);
gsonBuilder.registerTypeAdapterFactory(new InterfaceAdapterFactory(
SampleInterface.class, new Class<?>[] { SampleImplementation1.class, SampleImplementation2.class }
));
Gson gson = gsonBuilder.create();
String json = gson.toJson(toSerialize);
System.out.println(json);
SampleInterfaceContainer deserialized = gson.fromJson(json, SampleInterfaceContainer.class);
assertNotNull(deserialized);
assertEquals(toSerialize.getName(), deserialized.getName());
assertEquals(toSerialize.getContent().getNumber(), deserialized.getContent().getNumber());
}
public void testInterfaceSerialization2(){
SampleImplementation2 first = new SampleImplementation2(5, "test");
SampleInterfaceContainer toSerialize = new SampleInterfaceContainer("container", first);
first.Container = toSerialize;
GsonBuilder gsonBuilder = new GsonBuilder();
new GraphAdapterBuilder()
.addType(SampleInterfaceContainer.class)
.addType(SampleImplementation1.class)
.addType(SampleImplementation2.class)
.registerOn(gsonBuilder);
gsonBuilder.registerTypeAdapterFactory(new InterfaceAdapterFactory(
SampleInterface.class, new Class<?>[] { SampleImplementation1.class, SampleImplementation2.class }
));
Gson gson = gsonBuilder.create();
String json = gson.toJson(toSerialize);
System.out.println(json);
SampleInterfaceContainer deserialized = gson.fromJson(json, SampleInterfaceContainer.class);
assertNotNull(deserialized);
assertEquals(toSerialize.getName(), deserialized.getName());
assertEquals(5, deserialized.getContent().getNumber());
assertEquals("test", ((SampleImplementation2)deserialized.getContent()).getName());
assertSame(deserialized, ((SampleImplementation2)deserialized.getContent()).Container);
}
}
및 일부 샘플 클래스와 같은 시험을 한 쌍 (확인 :
는이
package com.google.gson.graph;
/**
* @author Giacomo Tesio
*/
public interface GenericFunction<Domain, Codomain> {
Codomain map(Domain domain);
}
이 같은 TypeAdapterFactory 같은 위임 기능이 필요합니다 테스트가 통과 함)
public class SampleInterfaceContainer {
private SampleInterface content;
private String name;
public SampleInterfaceContainer(String name, SampleInterface content)
{
this.name = name;
this.content = content;
}
public String getName()
{
return this.name;
}
public SampleInterface getContent()
{
return this.content;
}
}
public interface SampleInterface {
int getNumber();
}
public class SampleImplementation1 implements SampleInterface{
private int number;
public SampleImplementation1()
{
this.number = 0;
}
public SampleImplementation1(int number)
{
this.number = number;
}
public int getNumber()
{
return this.number;
}
}
public class SampleImplementation2 implements SampleInterface{
private int number;
private String name;
public SampleInterfaceContainer Container;
public SampleImplementation2()
{
this.number = 0;
this.name = "";
}
public SampleImplementation2(int number, String name)
{
this.number = number;
this.name = name;
}
public int getNumber()
{
return this.number;
}
public String getName()
{
return this.name;
}
}
이것은 빠른 & 더러운 해킹 이었지만, 그것은 charme처럼 작동합니다.
GsonBuilder를 초기화하는 동안 작업 순서에주의를 기울여야합니다. 이 팩토리를 등록한 후에 만 먼저 GraphAdapterBuilder을 초기화하고 등록해야합니다.
자바 전문가가 아니기 때문에 조금 까다로운 경우 재밌습니다.
당신이 가지고있는 클래스들과 그들 사이의 의존성을 제공 할 수 있습니까? 사소한 속성없이 클래스 만. –