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Instrumentation of Java libraries using OpenTelemetry.

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/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package io.opentelemetry.javaagent.tooling.instrumentation;

import java.security.ProtectionDomain;
import net.bytebuddy.agent.builder.AgentBuilder;
import net.bytebuddy.asm.TypeConstantAdjustment;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.utility.JavaModule;

/**
 * This {@link AgentBuilder.Transformer} ensures that class files of a version previous to Java 5 do
 * not store class entries in the generated class's constant pool.
 *
 * @see ConstantAdjuster The ASM visitor that does the actual work.
 */
final class ConstantAdjuster implements AgentBuilder.Transformer {
  private static final ConstantAdjuster INSTANCE = new ConstantAdjuster();

  static AgentBuilder.Transformer instance() {
    return INSTANCE;
  }

  private ConstantAdjuster() {}

  @Override
  public DynamicType.Builder transform(
      DynamicType.Builder builder,
      TypeDescription typeDescription,
      ClassLoader classLoader,
      JavaModule javaModule,
      ProtectionDomain protectionDomain) {
    return builder.visit(TypeConstantAdjustment.INSTANCE);
  }
}