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JacksonDecoder.java
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72 lines (64 loc) · 2.31 KB
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/**
* Copyright 2012-2021 The Feign Authors
*
* 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 java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Collections;
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;
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.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;
}
}
}