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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.injection;

import java.lang.reflect.*;
import java.util.*;
import java.util.Map.*;
import java.util.concurrent.*;
import javax.annotation.*;
import javax.inject.*;

import mockit.internal.reflection.*;
import static mockit.internal.injection.InjectionPoint.*;
import static mockit.internal.util.Utilities.getClassType;

/**
 * Holds state used throughout the injection process while it's in progress for a given set of tested objects.
 */
@SuppressWarnings("ParameterHidesMemberVariable")
public final class InjectionState
{
   @Nonnull private static final Map globalDependencies = new ConcurrentHashMap<>(2);

   @Nonnull private final Map testedObjects;
   @Nonnull private final Map instantiatedDependencies;
   @Nonnull private List injectables;
   @Nonnull private List consumedInjectionProviders;
   @Nonnull public final LifecycleMethods lifecycleMethods;
   @Nonnull final InterfaceResolution interfaceResolution;
   @Nullable private BeanExporter beanExporter;
   private Object currentTestClassInstance;
   private Type typeOfInjectionPoint;

   InjectionState() {
      testedObjects = new LinkedHashMap<>();
      instantiatedDependencies = new LinkedHashMap<>();
      injectables = Collections.emptyList();
      consumedInjectionProviders = new ArrayList<>();
      lifecycleMethods = new LifecycleMethods();
      interfaceResolution = new InterfaceResolution();
   }

   boolean setInjectables(@Nonnull List injectables) {
      if (injectables.isEmpty()) {
         this.injectables = Collections.emptyList();
         return false;
      }

      this.injectables = new ArrayList<>(injectables);
      return true;
   }

   void setInjectables(@Nonnull Object testClassInstance, @Nonnull List injectables) {
      currentTestClassInstance = testClassInstance;
      setInjectables(injectables);
      lifecycleMethods.getServletConfigForInitMethodsIfAny(injectables, testClassInstance);
   }

   void addInjectables(@Nonnull Object testClassInstance, @Nonnull List injectablesToAdd) {
      currentTestClassInstance = testClassInstance;
      addInjectables(injectablesToAdd);
      lifecycleMethods.getServletConfigForInitMethodsIfAny(injectables, testClassInstance);
   }

   private void addInjectables(@Nonnull List injectablesToAdd) {
      if (!injectablesToAdd.isEmpty()) {
         if (injectables.isEmpty()) {
            injectables = new ArrayList<>(injectablesToAdd);
         }
         else {
            injectables.addAll(injectablesToAdd);
         }
      }
   }

   Object getCurrentTestClassInstance() { return currentTestClassInstance; }

   public void setTypeOfInjectionPoint(@Nonnull Type typeOfInjectionPoint) { this.typeOfInjectionPoint = typeOfInjectionPoint; }

   public boolean isAssignableToInjectionPoint(@Nonnull Type injectableType, @Nonnull TestedClass testedClass) {
      if (testedClass.reflection.areMatchingTypes(typeOfInjectionPoint, injectableType)) {
         return true;
      }

      if (typeOfInjectionPoint instanceof ParameterizedType) {
         ParameterizedType parameterizedType = (ParameterizedType) typeOfInjectionPoint;
         Class classOfInjectionPoint = (Class) parameterizedType.getRawType();

         if (
            Iterable.class.isAssignableFrom(classOfInjectionPoint) ||
            INJECT_CLASS != null && Provider.class.isAssignableFrom(classOfInjectionPoint)
         ) {
            Type providedType = parameterizedType.getActualTypeArguments()[0];

            if (providedType.equals(injectableType)) {
               return true;
            }

            Class injectableClass = getClassType(injectableType);
            Class providedClass = getClassType(providedType);

            return providedClass.isAssignableFrom(injectableClass);
         }
      }

      return false;
   }

   @Nullable
   public InjectionProvider findNextInjectableForInjectionPoint(@Nonnull TestedClass testedClass) {
      for (InjectionProvider injectable : injectables) {
         if (hasTypeAssignableToInjectionPoint(injectable, testedClass) && !consumedInjectionProviders.contains(injectable)) {
            return injectable;
         }
      }

      return null;
   }

   private boolean hasTypeAssignableToInjectionPoint(@Nonnull InjectionProvider injectable, @Nonnull TestedClass testedClass) {
      Type declaredType = injectable.getDeclaredType();
      return isAssignableToInjectionPoint(declaredType, testedClass);
   }

   @Nullable
   public InjectionProvider getProviderByTypeAndOptionallyName(@Nonnull String nameOfInjectionPoint, @Nonnull TestedClass testedClass) {
      Type elementTypeOfIterable = getElementTypeIfIterable(typeOfInjectionPoint);

      if (elementTypeOfIterable != null) {
         return findInjectablesByTypeOnly(elementTypeOfIterable, testedClass);
      }

      return findInjectableByTypeAndOptionallyName(nameOfInjectionPoint, testedClass);
   }

   @Nullable
   private static Type getElementTypeIfIterable(@Nonnull Type injectableType) {
      if (injectableType instanceof ParameterizedType) {
         ParameterizedType parameterizedType = (ParameterizedType) injectableType;
         Class classOfInjectionPoint = (Class) parameterizedType.getRawType();

         if (Iterable.class.isAssignableFrom(classOfInjectionPoint)) {
            return parameterizedType.getActualTypeArguments()[0];
         }
      }

      return null;
   }

   @Nullable
   private InjectionProvider findInjectablesByTypeOnly(@Nonnull Type elementType, @Nonnull TestedClass testedClass) {
      GenericTypeReflection typeReflection = testedClass.reflection;
      MultiValuedProvider found = null;

      for (InjectionProvider injectable : injectables) {
         Type injectableType = injectable.getDeclaredType();
         Type elementTypeOfIterable = getElementTypeIfIterable(injectableType);

         if (elementTypeOfIterable != null && typeReflection.areMatchingTypes(elementType, elementTypeOfIterable)) {
            return injectable;
         }

         if (isAssignableToInjectionPoint(injectableType, testedClass)) {
            if (found == null) {
               found = new MultiValuedProvider(elementType);
            }

            found.addInjectable(injectable);
         }
      }

      return found;
   }

   @Nullable
   private InjectionProvider findInjectableByTypeAndOptionallyName(@Nonnull String nameOfInjectionPoint, @Nonnull TestedClass testedClass) {
      InjectionProvider foundInjectable = null;

      for (InjectionProvider injectable : injectables) {
         if (hasTypeAssignableToInjectionPoint(injectable, testedClass)) {
            if (nameOfInjectionPoint.equals(injectable.getName())) {
               return injectable;
            }

            if (foundInjectable == null) {
               foundInjectable = injectable;
            }
         }
      }

      return foundInjectable;
   }

   @Nullable
   public InjectionProvider findInjectableByTypeAndName(@Nonnull String nameOfInjectionPoint, @Nonnull TestedClass testedClass) {
      for (InjectionProvider injectable : injectables) {
         if (hasTypeAssignableToInjectionPoint(injectable, testedClass) && nameOfInjectionPoint.equals(injectable.getName())) {
            return injectable;
         }
      }

      return null;
   }

   @Nullable
   public Object getValueToInject(@Nonnull InjectionProvider injectionProvider) {
      if (consumedInjectionProviders.contains(injectionProvider)) {
         return null;
      }

      Object value = injectionProvider.getValue(currentTestClassInstance);

      if (value != null) {
         consumedInjectionProviders.add(injectionProvider);
      }

      return value;
   }

   void resetConsumedInjectionProviders() { consumedInjectionProviders.clear(); }

   @Nonnull
   public List saveConsumedInjectionProviders() {
      List previouslyConsumed = consumedInjectionProviders;
      consumedInjectionProviders = new ArrayList<>();
      return previouslyConsumed;
   }

   public void restoreConsumedInjectionProviders(@Nonnull List previouslyConsumed) {
      consumedInjectionProviders = previouslyConsumed;
   }

   void saveTestedObject(@Nonnull InjectionPoint key, @Nonnull Object testedObject) {
      testedObjects.put(key, testedObject);
   }

   @Nullable
   Object getTestedInstance(@Nonnull Type testedType, @Nonnull String nameOfInjectionPoint) {
      Object testedInstance = instantiatedDependencies.isEmpty() ?
         null : findPreviouslyInstantiatedDependency(testedType, nameOfInjectionPoint);

      if (testedInstance == null) {
         testedInstance = testedObjects.isEmpty() ? null : getValueFromExistingTestedObject(testedType, nameOfInjectionPoint);
      }

      return testedInstance;
   }

   @Nullable
   private Object findPreviouslyInstantiatedDependency(@Nonnull Type testedType, @Nonnull String nameOfInjectionPoint) {
      InjectionPoint injectionPoint = new InjectionPoint(testedType, nameOfInjectionPoint);
      Object dependency = instantiatedDependencies.get(injectionPoint);

      if (dependency == null) {
         //noinspection ReuseOfLocalVariable
         injectionPoint = new InjectionPoint(testedType);
         dependency = instantiatedDependencies.get(injectionPoint);

         if (dependency == null) {
            dependency = findMatchingObject(instantiatedDependencies, null, injectionPoint);
         }
      }

      return dependency;
   }

   @Nullable
   private Object getValueFromExistingTestedObject(@Nonnull Type testedType, @Nonnull String nameOfInjectionPoint) {
      InjectionPoint injectionPoint = new InjectionPoint(testedType, nameOfInjectionPoint);

      for (Object testedObject : testedObjects.values()) {
         Object fieldValue = getValueFromFieldOfEquivalentTypeAndName(injectionPoint, testedObject);

         if (fieldValue != null) {
            return fieldValue;
         }
      }

      return null;
   }

   @Nullable
   private static Object getValueFromFieldOfEquivalentTypeAndName(@Nonnull InjectionPoint injectionPoint, @Nonnull Object testedObject) {
      for (Field internalField : testedObject.getClass().getDeclaredFields()) {
         Type fieldType = internalField.getGenericType();
         String qualifiedName = getQualifiedName(internalField.getDeclaredAnnotations());
         boolean qualified = qualifiedName != null;
         String fieldName = qualified ? qualifiedName : internalField.getName();
         InjectionPoint internalInjectionPoint = new InjectionPoint(fieldType, fieldName, qualified);

         if (internalInjectionPoint.equals(injectionPoint)) {
            Object fieldValue = FieldReflection.getFieldValue(internalField, testedObject);
            return fieldValue;
         }
      }

      return null;
   }

   @Nullable @SuppressWarnings("unchecked")
   public static  D getGlobalDependency(@Nonnull InjectionPoint key) { return (D) globalDependencies.get(key); }

   @Nullable
   public Object getTestedValue(@Nonnull TestedClass testedClass, @Nonnull InjectionPoint injectionPoint) {
      Object testedValue = testedObjects.get(injectionPoint);

      if (testedValue == null) {
         testedValue = findMatchingObject(testedObjects, testedClass, injectionPoint);
      }

      return testedValue;
   }

   @Nullable
   public Object getInstantiatedDependency(@Nullable TestedClass testedClass, @Nonnull InjectionPoint dependencyKey) {
      Object dependency = testedObjects.get(dependencyKey);

      if (dependency == null) {
         dependency = findMatchingObject(testedObjects, testedClass, dependencyKey);

         if (dependency == null) {
            dependency = instantiatedDependencies.get(dependencyKey);

            if (dependency == null) {
               dependency = findMatchingObject(instantiatedDependencies, testedClass, dependencyKey);

               if (dependency == null) {
                  dependency = findMatchingObject(globalDependencies, testedClass, dependencyKey);
               }
            }
         }
      }

      return dependency;
   }

   @Nullable
   private static Object findMatchingObject(
      @Nonnull Map availableObjects, @Nullable TestedClass testedClass, @Nonnull InjectionPoint injectionPoint
   ) {
      if (availableObjects.isEmpty()) {
         return null;
      }

      GenericTypeReflection reflection = testedClass == null ? null : testedClass.reflection;
      Type dependencyType = injectionPoint.type;
      Object found = null;

      for (Entry injectionPointAndObject : availableObjects.entrySet()) {
         InjectionPoint dependencyIP = injectionPointAndObject.getKey();
         Object dependencyObject = injectionPointAndObject.getValue();

         if (injectionPoint.equals(dependencyIP)) {
            return dependencyObject;
         }

         if (reflection != null) {
            if (reflection.areMatchingTypes(dependencyType, dependencyIP.type)) {
               found = dependencyObject;
            }
            else {
               continue;
            }
         }

         if (injectionPoint.hasSameName(dependencyIP)) {
            return dependencyObject;
         }
      }

      return injectionPoint.qualified ? null : found;
   }

   public void saveInstantiatedDependency(@Nonnull InjectionPoint dependencyKey, @Nonnull Object dependency) {
      instantiatedDependencies.put(dependencyKey, dependency);
   }

   public static void saveGlobalDependency(@Nonnull InjectionPoint dependencyKey, @Nonnull Object dependency) {
      globalDependencies.put(dependencyKey, dependency);
   }

   void clearTestedObjectsAndInstantiatedDependencies() {
      testedObjects.clear();
      instantiatedDependencies.clear();
   }

   @Nonnull
   BeanExporter getBeanExporter() {
      if (beanExporter == null) {
         beanExporter = new BeanExporter(this);
      }

      return beanExporter;
   }

   @Nullable
   public Class resolveInterface(@Nonnull Class anInterface) {
      return interfaceResolution.resolveInterface(anInterface, currentTestClassInstance);
   }
}