/*
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* Copyright (C) 2011 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 java.io.IOException;
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import java.lang.reflect.Type;
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import java.util.Collection;
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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.internal.$Gson$Types;
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import cn.emay.sdk.util.json.gson.internal.ConstructorConstructor;
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import cn.emay.sdk.util.json.gson.internal.ObjectConstructor;
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import cn.emay.sdk.util.json.gson.reflect.TypeToken;
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import cn.emay.sdk.util.json.gson.stream.JsonReader;
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import cn.emay.sdk.util.json.gson.stream.JsonToken;
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import cn.emay.sdk.util.json.gson.stream.JsonWriter;
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/**
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* Adapt a homogeneous collection of objects.
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*/
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public final class CollectionTypeAdapterFactory implements TypeAdapterFactory {
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private final ConstructorConstructor constructorConstructor;
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public CollectionTypeAdapterFactory(ConstructorConstructor constructorConstructor) {
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this.constructorConstructor = constructorConstructor;
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}
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@Override
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public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
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Type type = typeToken.getType();
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Class<? super T> rawType = typeToken.getRawType();
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if (!Collection.class.isAssignableFrom(rawType)) {
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return null;
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}
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Type elementType = $Gson$Types.getCollectionElementType(type, rawType);
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TypeAdapter<?> elementTypeAdapter = gson.getAdapter(TypeToken.get(elementType));
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ObjectConstructor<T> constructor = constructorConstructor.get(typeToken);
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@SuppressWarnings({ "unchecked", "rawtypes" }) // create() doesn't define a type parameter
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TypeAdapter<T> result = new Adapter(gson, elementType, elementTypeAdapter, constructor);
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return result;
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}
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private static final class Adapter<E> extends TypeAdapter<Collection<E>> {
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private final TypeAdapter<E> elementTypeAdapter;
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private final ObjectConstructor<? extends Collection<E>> constructor;
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public Adapter(Gson context, Type elementType, TypeAdapter<E> elementTypeAdapter, ObjectConstructor<? extends Collection<E>> constructor) {
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this.elementTypeAdapter = new TypeAdapterRuntimeTypeWrapper<E>(context, elementTypeAdapter, elementType);
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this.constructor = constructor;
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}
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@Override
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public Collection<E> read(JsonReader in) throws IOException {
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if (in.peek() == JsonToken.NULL) {
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in.nextNull();
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return null;
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}
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Collection<E> collection = constructor.construct();
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in.beginArray();
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while (in.hasNext()) {
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E instance = elementTypeAdapter.read(in);
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collection.add(instance);
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}
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in.endArray();
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return collection;
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}
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@Override
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public void write(JsonWriter out, Collection<E> collection) throws IOException {
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if (collection == null) {
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out.nullValue();
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return;
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}
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out.beginArray();
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for (E element : collection) {
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elementTypeAdapter.write(out, element);
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}
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out.endArray();
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}
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}
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}
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