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