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Copy pathPairedEncoder.java
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77 lines (67 loc) · 2.75 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.RequestTemplate;
import java.lang.reflect.Type;
import java.util.Objects;
/** An encoder that does not declare itself, guarded by a predicate supplied at the call site. */
final class PairedEncoder implements PredicatedEncoder {
private final EncoderPredicate predicate;
private final Encoder encoder;
PairedEncoder(EncoderPredicate predicate, Encoder encoder) {
this.predicate = Objects.requireNonNull(predicate, "predicate cannot be null");
this.encoder = Objects.requireNonNull(encoder, "encoder cannot be null");
}
@Override
public boolean canEncode(Object object, Type bodyType, RequestTemplate template) {
return predicate.canEncode(object, bodyType, template);
}
@Override
public void encode(Object object, Type bodyType, RequestTemplate template)
throws EncodeException {
encoder.encode(object, bodyType, template);
}
@Override
public String toString() {
return describe(encoder) + " when " + predicate;
}
/** Requires both the predicate and, when the encoder declares one, its own applicability. */
static EncoderPredicate narrow(EncoderPredicate predicate, Encoder encoder) {
Objects.requireNonNull(predicate, "predicate cannot be null");
Objects.requireNonNull(encoder, "encoder cannot be null");
if (!(encoder instanceof PredicatedEncoder)) {
return predicate;
}
if (encoder instanceof PairedEncoder) {
return predicate.and(((PairedEncoder) encoder).predicate);
}
PredicatedEncoder predicated = (PredicatedEncoder) encoder;
return predicate.and(
EncoderPredicate.describedAs(describe(encoder) + " accepts it", predicated::canEncode));
}
/** The encoder's own {@code toString} when it has one, its class name otherwise. */
static String describe(Encoder encoder) {
Class<?> type = encoder.getClass();
try {
if (type.getMethod("toString").getDeclaringClass() != Object.class) {
return encoder.toString();
}
} catch (NoSuchMethodException ignored) {
// cannot happen, every class has toString
}
return type.getSimpleName().isEmpty() ? type.getName() : type.getSimpleName();
}
}