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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 com.google.gson.Gson; | |
20 | import com.google.gson.TypeAdapter; | |
21 | import com.google.gson.TypeAdapterFactory; | |
22 | import com.google.gson.internal.LinkedTreeMap; | |
23 | import com.google.gson.reflect.TypeToken; | |
24 | import com.google.gson.stream.JsonReader; | |
25 | import com.google.gson.stream.JsonToken; | |
26 | import com.google.gson.stream.JsonWriter; | |
27 | ||
28 | import java.io.IOException; | |
29 | import java.util.ArrayList; | |
30 | import java.util.List; | |
31 | import java.util.Map; | |
32 | ||
33 | /** | |
34 | * Adapts types whose static type is only 'Object'. Uses getClass() on | |
35 | * serialization and a primitive/Map/List on deserialization. | |
36 | */ | |
37 | public final class ObjectTypeAdapter extends TypeAdapter<Object> { | |
38 | public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() { | |
39 | @SuppressWarnings("unchecked") | |
40 | public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) { | |
41 | if (type.getRawType() == Object.class) { | |
42 | return (TypeAdapter<T>) new ObjectTypeAdapter(gson); | |
43 | } | |
44 | return null; | |
45 | } | |
46 | }; | |
47 | ||
48 | private final Gson gson; | |
49 | ||
50 | private ObjectTypeAdapter(Gson gson) { | |
51 | this.gson = gson; | |
52 | } | |
53 | ||
54 | @Override public Object read(JsonReader in) throws IOException { | |
55 | JsonToken token = in.peek(); | |
56 | switch (token) { | |
57 | case BEGIN_ARRAY: | |
58 | List<Object> list = new ArrayList<Object>(); | |
59 | in.beginArray(); | |
60 | while (in.hasNext()) { | |
61 | list.add(read(in)); | |
62 | } | |
63 | in.endArray(); | |
64 | return list; | |
65 | ||
66 | case BEGIN_OBJECT: | |
67 | Map<String, Object> map = new LinkedTreeMap<String, Object>(); | |
68 | in.beginObject(); | |
69 | while (in.hasNext()) { | |
70 | map.put(in.nextName(), read(in)); | |
71 | } | |
72 | in.endObject(); | |
73 | return map; | |
74 | ||
75 | case STRING: | |
76 | return in.nextString(); | |
77 | ||
78 | case NUMBER: | |
79 | return in.nextDouble(); | |
80 | ||
81 | case BOOLEAN: | |
82 | return in.nextBoolean(); | |
83 | ||
84 | case NULL: | |
85 | in.nextNull(); | |
86 | return null; | |
87 | ||
88 | default: | |
89 | throw new IllegalStateException(); | |
90 | } | |
91 | } | |
92 | ||
93 | @SuppressWarnings("unchecked") | |
94 | @Override public void write(JsonWriter out, Object value) throws IOException { | |
95 | if (value == null) { | |
96 | out.nullValue(); | |
97 | return; | |
98 | } | |
99 | ||
100 | TypeAdapter<Object> typeAdapter = (TypeAdapter<Object>) gson.getAdapter(value.getClass()); | |
101 | if (typeAdapter instanceof ObjectTypeAdapter) { | |
102 | out.beginObject(); | |
103 | out.endObject(); | |
104 | return; | |
105 | } | |
106 | ||
107 | typeAdapter.write(out, value); | |
108 | } | |
109 | } |