2011-08-05 02:41:24 +02:00
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/*
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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 com.google.gson.internal.bind;
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import com.google.gson.reflect.TypeToken;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonWriter;
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2011-09-11 09:04:56 +02:00
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import java.io.IOException;
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import java.lang.reflect.Type;
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2011-08-05 02:41:24 +02:00
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final class TypeAdapterRuntimeTypeWrapper<T> extends TypeAdapter<T> {
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private final MiniGson context;
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private final TypeAdapter<T> delegate;
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private final Type type;
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TypeAdapterRuntimeTypeWrapper(MiniGson context, TypeAdapter<T> delegate, Type type) {
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this.context = context;
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this.delegate = delegate;
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this.type = type;
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}
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@Override
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public T read(JsonReader reader) throws IOException {
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return delegate.read(reader);
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}
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2011-10-20 23:32:46 +02:00
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@SuppressWarnings({"rawtypes", "unchecked"})
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2011-08-05 02:41:24 +02:00
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@Override
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public void write(JsonWriter writer, T value) throws IOException {
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2011-08-12 04:18:02 +02:00
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// Order of preference for choosing type adapters
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// First preference: a type adapter registered for the runtime type
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// Second preference: a type adapter registered for the declared type
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// Third preference: reflective type adapter for the runtime type (if it is a sub class of the declared type)
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// Fourth preference: reflective type adapter for the declared type
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TypeAdapter chosen = delegate;
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Type runtimeType = Reflection.getRuntimeTypeIfMoreSpecific(type, value);
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if (runtimeType != type) {
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TypeAdapter runtimeTypeAdapter = context.getAdapter(TypeToken.get(runtimeType));
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2011-09-11 09:04:56 +02:00
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if (!(runtimeTypeAdapter instanceof ReflectiveTypeAdapterFactory.Adapter)) {
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2011-08-12 04:18:02 +02:00
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// The user registered a type adapter for the runtime type, so we will use that
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chosen = runtimeTypeAdapter;
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2011-09-11 09:04:56 +02:00
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} else if (!(delegate instanceof ReflectiveTypeAdapterFactory.Adapter)) {
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2011-08-12 04:18:02 +02:00
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// The user registered a type adapter for Base class, so we prefer it over the
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// reflective type adapter for the runtime type
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chosen = delegate;
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} else {
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// Use the type adapter for runtime type
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chosen = runtimeTypeAdapter;
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2011-08-12 03:59:22 +02:00
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}
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}
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2011-08-12 04:18:02 +02:00
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chosen.write(writer, value);
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2011-08-05 02:41:24 +02:00
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}
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}
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