forked from OpenFeign/feign
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathGsonModule.java
More file actions
127 lines (109 loc) · 4.18 KB
/
GsonModule.java
File metadata and controls
127 lines (109 loc) · 4.18 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
/*
* Copyright 2013 Netflix, 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 feign.gson;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.InstanceCreator;
import com.google.gson.JsonIOException;
import com.google.gson.TypeAdapter;
import com.google.gson.internal.ConstructorConstructor;
import com.google.gson.internal.bind.MapTypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import dagger.Provides;
import feign.IncrementalCallback;
import feign.codec.Decoder;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import feign.codec.IncrementalDecoder;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Map;
import static dagger.Provides.Type.SET;
@dagger.Module(library = true, overrides = true)
public final class GsonModule {
@Provides(type = SET) Encoder encoder(GsonCodec codec) {
return codec;
}
@Provides(type = SET) Decoder decoder(GsonCodec codec) {
return codec;
}
@Provides(type = SET) IncrementalDecoder incrementalDecoder(GsonCodec codec) {
return codec;
}
static class GsonCodec implements Encoder.Text<Object>, Decoder.TextStream<Object>, IncrementalDecoder.TextStream<Object> {
private final Gson gson;
@Inject GsonCodec(Gson gson) {
this.gson = gson;
}
@Override public String encode(Object object) throws EncodeException {
return gson.toJson(object);
}
@Override public Object decode(Reader reader, Type type) throws IOException {
return fromJson(new JsonReader(reader), type);
}
@Override
public void decode(Reader reader, Type type, IncrementalCallback<? super Object> incrementalCallback) throws IOException {
JsonReader jsonReader = new JsonReader(reader);
jsonReader.beginArray();
while (jsonReader.hasNext()) {
incrementalCallback.onNext(fromJson(jsonReader, type));
}
jsonReader.endArray();
}
private Object fromJson(JsonReader jsonReader, Type type) throws IOException {
try {
return gson.fromJson(jsonReader, type);
} catch (JsonIOException e) {
if (e.getCause() != null && e.getCause() instanceof IOException) {
throw IOException.class.cast(e.getCause());
}
throw e;
}
}
}
// deals with scenario where gson Object type treats all numbers as doubles.
@Provides TypeAdapter<Map<String, Object>> doubleToInt() {
return new TypeAdapter<Map<String, Object>>() {
TypeAdapter<Map<String, Object>> delegate = new MapTypeAdapterFactory(new ConstructorConstructor(
Collections.<Type, InstanceCreator<?>>emptyMap()), false).create(new Gson(), token);
@Override
public void write(JsonWriter out, Map<String, Object> value) throws IOException {
delegate.write(out, value);
}
@Override
public Map<String, Object> read(JsonReader in) throws IOException {
Map<String, Object> map = delegate.read(in);
for (Map.Entry<String, Object> entry : map.entrySet()) {
if (entry.getValue() instanceof Double) {
entry.setValue(Double.class.cast(entry.getValue()).intValue());
}
}
return map;
}
}.nullSafe();
}
@Provides @Singleton Gson gson(TypeAdapter<Map<String, Object>> doubleToInt) {
return new GsonBuilder().registerTypeAdapter(token.getType(), doubleToInt).setPrettyPrinting().create();
}
protected final static TypeToken<Map<String, Object>> token = new TypeToken<Map<String, Object>>() {
};
}