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JacksonDecoder.java
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73 lines (66 loc) · 2.39 KB
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/*
* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)
*
* 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.jackson;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.RuntimeJsonMappingException;
import feign.Response;
import feign.Util;
import feign.codec.Decoder;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.Collections;
public class JacksonDecoder implements Decoder {
private final ObjectMapper mapper;
public JacksonDecoder() {
this(Collections.<Module>emptyList());
}
public JacksonDecoder(Iterable<Module> modules) {
this(
new ObjectMapper()
.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
.registerModules(modules));
}
public JacksonDecoder(ObjectMapper mapper) {
this.mapper = mapper;
}
@Override
public Object decode(Response response, Type type) throws IOException {
if (response.status() == 404 || response.status() == 204) return Util.emptyValueOf(type);
if (response.body() == null) return null;
Reader reader = response.body().asReader(response.charset());
if (!reader.markSupported()) {
reader = new BufferedReader(reader, 1);
}
try {
// Read the first byte to see if we have any data
reader.mark(1);
if (reader.read() == -1) {
return null; // Eagerly returning null avoids "No content to map due to end-of-input"
}
reader.reset();
return mapper.readValue(reader, mapper.constructType(type));
} catch (RuntimeJsonMappingException e) {
if (e.getCause() != null && e.getCause() instanceof IOException) {
throw IOException.class.cast(e.getCause());
}
throw e;
}
}
}