| /* |
| * Copyright (C) 2011 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 com.google.gson.internal.bind; |
| |
| import com.google.gson.Gson; |
| import com.google.gson.TypeAdapter; |
| import com.google.gson.TypeAdapterFactory; |
| import com.google.gson.internal.LinkedTreeMap; |
| 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.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Adapts types whose static type is only 'Object'. Uses getClass() on |
| * serialization and a primitive/Map/List on deserialization. |
| */ |
| public final class ObjectTypeAdapter extends TypeAdapter<Object> { |
| public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() { |
| @SuppressWarnings("unchecked") |
| @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) { |
| if (type.getRawType() == Object.class) { |
| return (TypeAdapter<T>) new ObjectTypeAdapter(gson); |
| } |
| return null; |
| } |
| }; |
| |
| private final Gson gson; |
| |
| private ObjectTypeAdapter(Gson gson) { |
| this.gson = gson; |
| } |
| |
| @Override public Object read(JsonReader in) throws IOException { |
| JsonToken token = in.peek(); |
| switch (token) { |
| case BEGIN_ARRAY: |
| List<Object> list = new ArrayList<Object>(); |
| in.beginArray(); |
| while (in.hasNext()) { |
| list.add(read(in)); |
| } |
| in.endArray(); |
| return list; |
| |
| case BEGIN_OBJECT: |
| Map<String, Object> map = new LinkedTreeMap<String, Object>(); |
| in.beginObject(); |
| while (in.hasNext()) { |
| map.put(in.nextName(), read(in)); |
| } |
| in.endObject(); |
| return map; |
| |
| case STRING: |
| return in.nextString(); |
| |
| case NUMBER: |
| return in.nextDouble(); |
| |
| case BOOLEAN: |
| return in.nextBoolean(); |
| |
| case NULL: |
| in.nextNull(); |
| return null; |
| |
| default: |
| throw new IllegalStateException(); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override public void write(JsonWriter out, Object value) throws IOException { |
| if (value == null) { |
| out.nullValue(); |
| return; |
| } |
| |
| TypeAdapter<Object> typeAdapter = (TypeAdapter<Object>) gson.getAdapter(value.getClass()); |
| if (typeAdapter instanceof ObjectTypeAdapter) { |
| out.beginObject(); |
| out.endObject(); |
| return; |
| } |
| |
| typeAdapter.write(out, value); |
| } |
| } |