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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, 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 JMockit developers
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.mocking;

import javax.annotation.*;

import mockit.internal.reflection.*;

/**
 * Factory for the creation of new mocked instances, and for obtaining/clearing the last instance created.
 * There are separate subclasses dedicated to mocked interfaces and mocked classes.
 */
public abstract class InstanceFactory
{
   @Nonnull final Class concreteClass;
   @Nullable Object lastInstance;

   InstanceFactory(@Nonnull Class concreteClass) { this.concreteClass = concreteClass; }

   @Nonnull public abstract Object create();

   @Nullable public final Object getLastInstance() { return lastInstance; }
   public abstract void clearLastInstance();

   static final class InterfaceInstanceFactory extends InstanceFactory {
      @Nullable private Object emptyProxy;

      InterfaceInstanceFactory(@Nonnull Object emptyProxy) {
         super(emptyProxy.getClass());
         this.emptyProxy = emptyProxy;
      }

      @Nonnull @Override
      public Object create() {
         if (emptyProxy == null) {
            emptyProxy = ConstructorReflection.newUninitializedInstance(concreteClass);
         }

         lastInstance = emptyProxy;
         return emptyProxy;
      }

      @Override
      public void clearLastInstance() {
         emptyProxy = null;
         lastInstance = null;
      }
   }

   static final class ClassInstanceFactory extends InstanceFactory {
      ClassInstanceFactory(@Nonnull Class concreteClass) { super(concreteClass); }

      @Override @Nonnull
      public Object create() {
         lastInstance = ConstructorReflection.newUninitializedInstance(concreteClass);
         return lastInstance;
      }

      @Override
      public void clearLastInstance() { lastInstance = null; }
   }
}