content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.akkahttp.server.route;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.extendsClass;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import akka.http.scaladsl.model.Uri;
  import akka.http.scaladsl.server.PathMatcher;
  import akka.http.scaladsl.server.PathMatchers;
  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 PathMatcherStaticInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return extendsClass(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$Path"))),
          this.getClass().getName() + "$ApplyAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ApplyAdvice {
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void onExit(
          @Advice.This PathMatcher<?> pathMatcher,
          @Advice.Argument(0) Uri.Path path,
          @Advice.Return PathMatcher.Matching<?> result) {
        // result is either matched or unmatched, we only care about the matches
        if (result.getClass() == PathMatcher.Matched.class) {
          if (PathMatchers.PathEnd$.class == pathMatcher.getClass()) {
            AkkaRouteHolder.endMatched();
            return;
          }
          // if present use the matched path that was remembered in PathMatcherInstrumentation,
          // otherwise just use a *
          String prefix = PathMatcherUtil.getMatched(pathMatcher);
          if (prefix == null) {
            if (PathMatchers.Slash$.class == pathMatcher.getClass()) {
              prefix = "/";
            } else {
              prefix = "*";
            }
          }
          if (prefix != null) {
            AkkaRouteHolder.push(prefix);
          }
        }
      }
    }
  }
  