kalix.javasdk.common.ForwardHeadersExtractor Maven / Gradle / Ivy

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/*
 * Copyright 2021 Lightbend Inc.
 *
 * 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 kalix.javasdk.common;

import kalix.javasdk.annotations.ForwardHeaders;

import java.util.Set;

public class ForwardHeadersExtractor {

  public static Set extractFrom(Class clazz) {
    ForwardHeaders forwardHeaders = clazz.getAnnotation(ForwardHeaders.class);
    if (forwardHeaders != null) {
      return Set.of(forwardHeaders.value());
    } else {
      return Set.of();
    }
  }
}