]>
Commit | Line | Data |
---|---|---|
cfd903b6 MG |
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 | } |