content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.akkahttp.server.route;
  
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.returns;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import akka.http.scaladsl.model.Uri;
  import akka.http.scaladsl.server.PathMatcher;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class PathMatcherInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("akka.http.scaladsl.server.PathMatcher$");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("apply")
              .and(takesArgument(0, named("akka.http.scaladsl.model.Uri$Path")))
              .and(returns(named("akka.http.scaladsl.server.PathMatcher"))),
          this.getClass().getName() + "$ApplyAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ApplyAdvice {
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void onEnter(
          @Advice.Argument(0) Uri.Path prefix, @Advice.Return PathMatcher<?> result) {
        // store the path being matched inside a VirtualField on the given matcher, so it can be used
        // for constructing the route
        PathMatcherUtil.setMatched(result, prefix.toString());
      }
    }
  }
  