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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2011 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.startup;

import java.lang.instrument.*;

import mockit.external.asm.*;
import mockit.external.asm.commons.*;
import mockit.internal.*;
import mockit.internal.util.*;

final class ToolLoader implements ClassVisitor
{
   private final String toolClassName;
   private final String toolArgs;
   private boolean loadClassFileTransformer;

   ToolLoader(String toolClassName, String toolArgs)
   {
      this.toolClassName = toolClassName;
      this.toolArgs = toolArgs;
   }

   public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)
   {
      if (interfaces != null && containsClassFileTransformer(interfaces)) {
         loadClassFileTransformer = true;
      }
   }

   private boolean containsClassFileTransformer(String[] interfaces)
   {
      for (String anInterface : interfaces) {
         if ("java/lang/instrument/ClassFileTransformer".equals(anInterface)) {
            return true;
         }
      }

      return false;
   }

   public AnnotationVisitor visitAnnotation(String desc, boolean visible) { return new EmptyVisitor(); }
   public void visitSource(String source, String debug) {}
   public void visitOuterClass(String owner, String name, String desc) {}
   public void visitAttribute(Attribute attr) {}
   public void visitInnerClass(String name, String outerName, String innerName, int access) {}
   public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) { return null; }
   public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
   { return null; }

   public void visitEnd()
   {
      if (loadClassFileTransformer) {
         createAndInstallSpecifiedClassFileTransformer();
      }
      else {
         setUpStartupMock();
      }
   }

   private void createAndInstallSpecifiedClassFileTransformer()
   {
      Class transformerClass = Utilities.loadClass(toolClassName);
      ClassFileTransformer transformer =
         Utilities.newInstance(transformerClass, new Class[] {String.class}, toolArgs);

      Startup.instrumentation().addTransformer(transformer);
   }

   private void setUpStartupMock()
   {
      Class mockClass;

      try {
         mockClass = Class.forName(toolClassName);
      }
      catch (ClassNotFoundException e) {
         throw new RuntimeException(e);
      }

      try {
         new RedefinitionEngine(null, mockClass).setUpStartupMock();
      }
      catch (TypeNotPresentException e) {
         // OK, ignores the startup mock if the necessary third-party class files are not in the classpath.
         System.out.println(e);
      }
   }
}