content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.servlet.common.service;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasSuperType;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class ServletOutputStreamInstrumentation implements TypeInstrumentation {
    private final String basePackageName;
    private final String writeBytesAndOffsetAdviceClassName;
    private final String writeBytesAdviceClassName;
    private final String writeIntAdviceClassName;
  
    public ServletOutputStreamInstrumentation(
        String basePackageName,
        String writeBytesAndOffsetAdviceClassName,
        String writeBytesAdviceClassName,
        String writeIntAdviceClassName) {
      this.basePackageName = basePackageName;
      this.writeBytesAndOffsetAdviceClassName = writeBytesAndOffsetAdviceClassName;
      this.writeBytesAdviceClassName = writeBytesAdviceClassName;
      this.writeIntAdviceClassName = writeIntAdviceClassName;
    }
  
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed(basePackageName + ".ServletOutputStream");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return hasSuperType(named(basePackageName + ".ServletOutputStream"));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("write")
              .and(takesArguments(3))
              .and(takesArgument(0, byte[].class))
              .and(takesArgument(1, int.class))
              .and(takesArgument(2, int.class))
              .and(isPublic()),
          writeBytesAndOffsetAdviceClassName);
      transformer.applyAdviceToMethod(
          named("write").and(takesArguments(1)).and(takesArgument(0, byte[].class)).and(isPublic()),
          writeBytesAdviceClassName);
      transformer.applyAdviceToMethod(
          named("write").and(takesArguments(1)).and(takesArgument(0, int.class)).and(isPublic()),
          writeIntAdviceClassName);
    }
  }
  