/*
|
* Copyright (C) 2014 Google Inc.
|
*
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
* you may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at
|
*
|
* http://www.apache.org/licenses/LICENSE-2.0
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*/
|
|
package cn.emay.sdk.util.json.gson.internal.bind;
|
|
import cn.emay.sdk.util.json.gson.Gson;
|
import cn.emay.sdk.util.json.gson.TypeAdapter;
|
import cn.emay.sdk.util.json.gson.TypeAdapterFactory;
|
import cn.emay.sdk.util.json.gson.annotations.JsonAdapter;
|
import cn.emay.sdk.util.json.gson.internal.ConstructorConstructor;
|
import cn.emay.sdk.util.json.gson.reflect.TypeToken;
|
|
/**
|
* Given a type T, looks for the annotation {@link JsonAdapter} and uses an
|
* instance of the specified class as the default type adapter.
|
*
|
* @since 2.3
|
*/
|
public final class JsonAdapterAnnotationTypeAdapterFactory implements TypeAdapterFactory {
|
|
private final ConstructorConstructor constructorConstructor;
|
|
public JsonAdapterAnnotationTypeAdapterFactory(ConstructorConstructor constructorConstructor) {
|
this.constructorConstructor = constructorConstructor;
|
}
|
|
@SuppressWarnings("unchecked")
|
@Override
|
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> targetType) {
|
JsonAdapter annotation = targetType.getRawType().getAnnotation(JsonAdapter.class);
|
if (annotation == null) {
|
return null;
|
}
|
return (TypeAdapter<T>) getTypeAdapter(constructorConstructor, gson, targetType, annotation);
|
}
|
|
@SuppressWarnings("unchecked") // Casts guarded by conditionals.
|
static TypeAdapter<?> getTypeAdapter(ConstructorConstructor constructorConstructor, Gson gson, TypeToken<?> fieldType, JsonAdapter annotation) {
|
Class<?> value = annotation.value();
|
TypeAdapter<?> typeAdapter;
|
if (TypeAdapter.class.isAssignableFrom(value)) {
|
Class<TypeAdapter<?>> typeAdapterClass = (Class<TypeAdapter<?>>) value;
|
typeAdapter = constructorConstructor.get(TypeToken.get(typeAdapterClass)).construct();
|
} else if (TypeAdapterFactory.class.isAssignableFrom(value)) {
|
Class<TypeAdapterFactory> typeAdapterFactory = (Class<TypeAdapterFactory>) value;
|
typeAdapter = constructorConstructor.get(TypeToken.get(typeAdapterFactory)).construct().create(gson, fieldType);
|
} else {
|
throw new IllegalArgumentException("@JsonAdapter value must be TypeAdapter or TypeAdapterFactory reference.");
|
}
|
if (typeAdapter != null) {
|
typeAdapter = typeAdapter.nullSafe();
|
}
|
return typeAdapter;
|
}
|
}
|