8000 feign/core/src/main/java/feign/optionals/OptionalDecoder.java at master · steam0/feign · GitHub 8000
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OptionalDecoder.java

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/*
* Copyright 2012-2023 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.optionals;
import feign.Response;
import feign.Util;
import feign.codec.Decoder;
import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Objects;
import java.util.Optional;
public final class OptionalDecoder implements Decoder {
final Decoder delegate;
public OptionalDecoder(Decoder delegate) {
Objects.requireNonNull(delegate, "Decoder must not be null. ");
this.delegate = delegate;
}
@Override
public Object decode(Response response, Type type) throws IOException {
if (!isOptional(type)) {
return delegate.decode(response, type);
}
if (response.status() == 404 || response.status() == 204) {
return Optional.empty();
}
Type enclosedType = Util.resolveLastTypeParameter(type, Optional.class);
return Optional.ofNullable(delegate.decode(response, enclosedType));
}
static boolean isOptional(Type type) {
if (!(type instanceof ParameterizedType)) {
return false;
}
ParameterizedType parameterizedType = (ParameterizedType) type;
return parameterizedType.getRawType().equals(Optional.class);
}
}
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