| 1 | /* |
| 2 | * Copyright (C) 2011 Google Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.google.gson.internal.bind; |
| 18 | |
| 19 | import java.io.IOException; |
| 20 | import java.lang.reflect.Array; |
| 21 | import java.lang.reflect.GenericArrayType; |
| 22 | import java.lang.reflect.Type; |
| 23 | import java.util.ArrayList; |
| 24 | import java.util.List; |
| 25 | |
| 26 | import com.google.gson.Gson; |
| 27 | import com.google.gson.TypeAdapter; |
| 28 | import com.google.gson.TypeAdapterFactory; |
| 29 | import com.google.gson.internal.$Gson$Types; |
| 30 | import com.google.gson.reflect.TypeToken; |
| 31 | import com.google.gson.stream.JsonReader; |
| 32 | import com.google.gson.stream.JsonToken; |
| 33 | import com.google.gson.stream.JsonWriter; |
| 34 | |
| 35 | /** |
| 36 | * Adapt an array of objects. |
| 37 | */ |
| 38 | public final class ArrayTypeAdapter<E> extends TypeAdapter<Object> { |
| 39 | public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() { |
| 40 | @SuppressWarnings({"unchecked", "rawtypes"}) |
| 41 | public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { |
| 42 | Type type = typeToken.getType(); |
| 43 | if (!(type instanceof GenericArrayType || type instanceof Class && ((Class<?>) type).isArray())) { |
| 44 | return null; |
| 45 | } |
| 46 | |
| 47 | Type componentType = $Gson$Types.getArrayComponentType(type); |
| 48 | TypeAdapter<?> componentTypeAdapter = gson.getAdapter(TypeToken.get(componentType)); |
| 49 | return new ArrayTypeAdapter( |
| 50 | gson, componentTypeAdapter, $Gson$Types.getRawType(componentType)); |
| 51 | } |
| 52 | }; |
| 53 | |
| 54 | private final Class<E> componentType; |
| 55 | private final TypeAdapter<E> componentTypeAdapter; |
| 56 | |
| 57 | public ArrayTypeAdapter(Gson context, TypeAdapter<E> componentTypeAdapter, Class<E> componentType) { |
| 58 | this.componentTypeAdapter = |
| 59 | new TypeAdapterRuntimeTypeWrapper<E>(context, componentTypeAdapter, componentType); |
| 60 | this.componentType = componentType; |
| 61 | } |
| 62 | |
| 63 | public Object read(JsonReader in) throws IOException { |
| 64 | if (in.peek() == JsonToken.NULL) { |
| 65 | in.nextNull(); |
| 66 | return null; |
| 67 | } |
| 68 | |
| 69 | List<E> list = new ArrayList<E>(); |
| 70 | in.beginArray(); |
| 71 | while (in.hasNext()) { |
| 72 | E instance = componentTypeAdapter.read(in); |
| 73 | list.add(instance); |
| 74 | } |
| 75 | in.endArray(); |
| 76 | Object array = Array.newInstance(componentType, list.size()); |
| 77 | for (int i = 0; i < list.size(); i++) { |
| 78 | Array.set(array, i, list.get(i)); |
| 79 | } |
| 80 | return array; |
| 81 | } |
| 82 | |
| 83 | @SuppressWarnings("unchecked") |
| 84 | @Override public void write(JsonWriter out, Object array) throws IOException { |
| 85 | if (array == null) { |
| 86 | out.nullValue(); |
| 87 | return; |
| 88 | } |
| 89 | |
| 90 | out.beginArray(); |
| 91 | for (int i = 0, length = Array.getLength(array); i < length; i++) { |
| 92 | E value = (E) Array.get(array, i); |
| 93 | componentTypeAdapter.write(out, value); |
| 94 | } |
| 95 | out.endArray(); |
| 96 | } |
| 97 | } |