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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;

import static java.lang.reflect.Modifier.*;

import mockit.external.asm.*;
import mockit.internal.filtering.*;
import mockit.internal.util.*;
import mockit.internal.startup.*;

import static mockit.external.asm.Opcodes.*;

public final class StubOutModifier extends BaseClassModifier
{
   private final MockingConfiguration stubbingCfg;
   private String superClassName;

   public StubOutModifier(ClassReader cr, MockingConfiguration stubbingConfiguration)
   {
      super(cr);
      stubbingCfg = stubbingConfiguration;
   }

   @Override
   public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)
   {
      superClassName = superName;
      super.visit(version, access, name, signature, superName, interfaces);
   }

   @Override
   public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
   {
      if (
         isAbstract(access) || (access & ACC_SYNTHETIC) != 0 || isNative(access) && !Startup.isJava6OrLater() ||
         stubbingCfg != null && !stubbingCfg.matchesFilters(name, desc)
      ) {
         return super.visitMethod(access, name, desc, signature, exceptions);
      }

      startModifiedMethodVersion(access, name, desc, signature, exceptions);

      if ("".equals(name)) {
         generateCallToSuper();
      }

      generateEmptyImplementation(desc);
      return methodAnnotationsVisitor;
   }

   private void generateCallToSuper()
   {
      mw.visitVarInsn(ALOAD, 0);

      String constructorDesc = SuperConstructorCollector.INSTANCE.findConstructor(superClassName);
      pushDefaultValuesForParameterTypes(constructorDesc);

      mw.visitMethodInsn(INVOKESPECIAL, superClassName, "", constructorDesc);
   }
}