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Copy pathPairedDecoder.java
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79 lines (69 loc) · 2.76 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.codec;
import feign.FeignException;
import feign.Response;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.Objects;
/** A decoder that does not declare itself, guarded by a predicate supplied at the call site. */
final class PairedDecoder implements PredicatedDecoder {
private final DecoderPredicate predicate;
private final Decoder decoder;
PairedDecoder(DecoderPredicate predicate, Decoder decoder) {
this.predicate = Objects.requireNonNull(predicate, "predicate cannot be null");
this.decoder = Objects.requireNonNull(decoder, "decoder cannot be null");
}
@Override
public boolean canDecode(Response response, Type type) {
return predicate.canDecode(response, type);
}
@Override
public Object decode(Response response, Type type)
throws IOException, DecodeException, FeignException {
return decoder.decode(response, type);
}
@Override
public String toString() {
return describe(decoder) + " when " + predicate;
}
/** Requires both the predicate and, when the decoder declares one, its own applicability. */
static DecoderPredicate narrow(DecoderPredicate predicate, Decoder decoder) {
Objects.requireNonNull(predicate, "predicate cannot be null");
Objects.requireNonNull(decoder, "decoder cannot be null");
if (!(decoder instanceof PredicatedDecoder)) {
return predicate;
}
if (decoder instanceof PairedDecoder) {
return predicate.and(((PairedDecoder) decoder).predicate);
}
PredicatedDecoder predicated = (PredicatedDecoder) decoder;
return predicate.and(
DecoderPredicate.describedAs(describe(decoder) + " accepts it", predicated::canDecode));
}
/** The decoder's own {@code toString} when it has one, its class name otherwise. */
static String describe(Decoder decoder) {
Class<?> type = decoder.getClass();
try {
if (type.getMethod("toString").getDeclaringClass() != Object.class) {
return decoder.toString();
}
} catch (NoSuchMethodException ignored) {
// cannot happen, every class has toString
}
return type.getSimpleName().isEmpty() ? type.getName() : type.getSimpleName();
}
}