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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.expectations.mocking;

import java.lang.reflect.Method;
import java.lang.reflect.*;
import java.util.ArrayList;
import java.util.*;

import static java.util.Arrays.*;
import static mockit.external.asm4.Opcodes.*;

import mockit.external.asm4.*;
import mockit.internal.*;
import mockit.internal.filtering.*;
import mockit.internal.util.*;

final class SubclassGenerationModifier extends BaseClassModifier
{
   private static final int CLASS_ACCESS_MASK = 0xFFFF - ACC_ABSTRACT;

   private final MockingConfiguration mockingCfg;
   private final Class abstractClass;
   private final String subclassName;
   private String superClassName;
   private String superClassOfSuperClass;
   private Set superInterfaces;
   private final List implementedMethods;

   SubclassGenerationModifier(
      MockingConfiguration mockingConfiguration, Class abstractClass, ClassReader classReader, String subclassName)
   {
      super(classReader);
      mockingCfg = mockingConfiguration;
      this.abstractClass = abstractClass;
      this.subclassName = subclassName.replace('.', '/');
      implementedMethods = new ArrayList();
   }

   @Override
   public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)
   {
      super.visit(version, access & CLASS_ACCESS_MASK, subclassName, signature, name, null);
      superClassName = name;
      superClassOfSuperClass = superName;
      superInterfaces = new HashSet(asList(interfaces));
   }

   @Override
   public void visitInnerClass(String name, String outerName, String innerName, int access) {}

   @Override
   public void visitOuterClass(String owner, String name, String desc) {}

   @Override
   public void visitAttribute(Attribute attr) {}

   @Override
   public void visitSource(String file, String debug) {}

   @Override
   public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) { return null; }

   @Override
   public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
   {
      // Inherits from super-class when non-abstract.
      // Otherwise, creates implementation for abstract method with call to "recordOrReplay".
      generateImplementationIfAbstractMethod(superClassName, access, name, desc, signature, exceptions);
      return null;
   }

   private void generateImplementationIfAbstractMethod(
      String className, int access, String name, String desc, String signature, String[] exceptions)
   {
      if (!"".equals(name)) {
         String methodNameAndDesc = name + desc;

         if (!implementedMethods.contains(methodNameAndDesc)) {
            if (Modifier.isAbstract(access)) {
               generateMethodImplementation(className, access, name, desc, signature, exceptions);
            }

            implementedMethods.add(methodNameAndDesc);
         }
      }
   }

   private void generateMethodImplementation(
      String className, int access, String name, String desc, String signature, String[] exceptions)
   {
      mw = super.visitMethod(ACC_PUBLIC, name, desc, signature, exceptions);

      boolean noFiltersToMatch = mockingCfg == null;

      if (
         noFiltersToMatch && !isMethodFromObject(name, desc) ||
         !noFiltersToMatch && mockingCfg.matchesFilters(name, desc)
      ) {
         generateDirectCallToHandler(className, access, name, desc, signature, exceptions, 0);
         generateReturnWithObjectAtTopOfTheStack(desc);
         mw.visitMaxs(1, 0);
      }
      else {
         generateEmptyImplementation(desc);
      }
   }

   @Override
   public void visitEnd()
   {
      generateImplementationsForInheritedAbstractMethods(superClassOfSuperClass);

      while (!superInterfaces.isEmpty()) {
         String superInterface = superInterfaces.iterator().next();
         generateImplementationsForInterfaceMethods(superInterface);
         superInterfaces.remove(superInterface);
      }
   }

   private void generateImplementationsForInheritedAbstractMethods(String superName)
   {
      if (!"java/lang/Object".equals(superName)) {
         new MethodModifierForSuperclass(superName);
      }
   }

   private void generateImplementationsForInterfaceMethods(String superName)
   {
      if (!"java/lang/Object".equals(superName)) {
         new MethodModifierForImplementedInterface(superName);
      }
   }

   private class BaseMethodModifier extends ClassVisitor
   {
      final String typeName;

      BaseMethodModifier(String typeName)
      {
         this.typeName = typeName;
         ClassFile.visitClass(typeName, this);
      }

      @Override
      public FieldVisitor visitField(int access, String name, String desc, String signature, Object value)
      {
         return null;
      }
   }

   private final class MethodModifierForSuperclass extends BaseMethodModifier
   {
      String superName;

      MethodModifierForSuperclass(String className) { super(className); }

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

         if (interfaces != null) {
            superInterfaces.addAll(asList(interfaces));
         }
      }

      @Override
      public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
      {
         generateImplementationIfAbstractMethod(typeName, access, name, desc, signature, exceptions);
         return null;
      }

      @Override
      public void visitEnd()
      {
         generateImplementationsForInheritedAbstractMethods(superName);
      }
   }

   private final class MethodModifierForImplementedInterface extends BaseMethodModifier
   {
      MethodModifierForImplementedInterface(String interfaceName) { super(interfaceName); }

      @Override
      public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)
      {
         superInterfaces.addAll(asList(interfaces));
      }

      @Override
      public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
      {
         generateImplementationForInterfaceMethodIfMissing(access, name, desc, signature, exceptions);
         return null;
      }

      private void generateImplementationForInterfaceMethodIfMissing(
         int access, String name, String desc, String signature, String[] exceptions)
      {
         String methodNameAndDesc = name + desc;

         if (!implementedMethods.contains(methodNameAndDesc)) {
            if (!hasMethodImplementation(name, desc)) {
               generateMethodImplementation(typeName, access, name, desc, signature, exceptions);
            }

            implementedMethods.add(methodNameAndDesc);
         }
      }

      private boolean hasMethodImplementation(String name, String desc)
      {
         Class[] paramTypes = Utilities.getParameterTypes(desc);

         try {
            Method method = abstractClass.getMethod(name, paramTypes);
            return !method.getDeclaringClass().isInterface();
         }
         catch (NoSuchMethodException ignore) {
            return false;
         }
      }
   }
}