content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package instrumentation;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  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 TestTypeInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed("org.apache.commons.lang3.SystemUtils");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("org.apache.commons.lang3.SystemUtils");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("getHostName"), TestTypeInstrumentation.class.getName() + "$GetHostNameAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class GetHostNameAdvice {
  
      @Advice.OnMethodExit
      public static void methodExit(@Advice.Return(readOnly = false) String hostName) {
        hostName = "not-the-host-name";
      }
    }
  }
  