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GsonDecoder.java
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65 lines (55 loc) · 1.76 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.JsonIOException;
import com.google.gson.TypeAdapter;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.Collections;
import feign.Response;
import feign.Util;
import feign.codec.Decoder;
import static feign.Util.ensureClosed;
public class GsonDecoder implements Decoder {
private final Gson gson;
public GsonDecoder(Iterable<TypeAdapter<?>> adapters) {
this(GsonFactory.create(adapters));
}
public GsonDecoder() {
this(Collections.<TypeAdapter<?>>emptyList());
}
public GsonDecoder(Gson gson) {
this.gson = gson;
}
@Override
public Object decode(Response response, Type type) throws IOException {
if (response.status() == 404) return Util.emptyValueOf(type);
if (response.body() == null) return null;
Reader reader = response.body().asReader();
try {
return gson.fromJson(reader, type);
} catch (JsonIOException e) {
if (e.getCause() != null && e.getCause() instanceof IOException) {
throw IOException.class.cast(e.getCause());
}
throw e;
} finally {
ensureClosed(reader);
}
}
}