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GsonModule.java
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92 lines (84 loc) · 2.78 KB
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/*
* 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.TypeAdapter;
import dagger.Provides;
import feign.Feign;
import feign.codec.Decoder;
import feign.codec.Encoder;
import javax.inject.Singleton;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Set;
import static feign.Util.resolveLastTypeParameter;
/**
* <h3>Custom type adapters</h3>
* <br>
* In order to specify custom json parsing,
* {@code Gson} supports {@link TypeAdapter type adapters}. This module adds one
* to read numbers in a {@code Map<String, Object>} as Integers. You can
* customize further by adding additional set bindings to the raw type
* {@code TypeAdapter}.
* <p/>
* <br>
* Here's an example of adding a custom json type adapter.
* <p/>
* <pre>
* @Provides(type = Provides.Type.SET)
* TypeAdapter upperZone() {
* return new TypeAdapter<Zone>() {
*
* @Override
* public void write(JsonWriter out, Zone value) throws IOException {
* throw new IllegalArgumentException();
* }
*
* @Override
* public Zone read(JsonReader in) throws IOException {
* in.beginObject();
* Zone zone = new Zone();
* while (in.hasNext()) {
* zone.put(in.nextName(), in.nextString().toUpperCase());
* }
* in.endObject();
* return zone;
* }
* };
* }
* </pre>
*/
@dagger.Module(injects = Feign.class, addsTo = Feign.Defaults.class)
public final class GsonModule {
@Provides Encoder encoder(Gson gson) {
return new GsonEncoder(gson);
}
@Provides Decoder decoder(Gson gson) {
return new GsonDecoder(gson);
}
@Provides @Singleton Gson gson(Set<TypeAdapter> adapters) {
GsonBuilder builder = new GsonBuilder().setPrettyPrinting();
for (TypeAdapter<?> adapter : adapters) {
Type type = resolveLastTypeParameter(adapter.getClass(), TypeAdapter.class);
builder.registerTypeAdapter(type, adapter);
}
return builder.create();
}
@Provides(type = Provides.Type.SET_VALUES) Set<TypeAdapter> noDefaultTypeAdapters() {
return Collections.emptySet();
}
}