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JMockit is a Java toolkit for automated developer testing. It contains APIs for the creation of the objects to be tested, for mocking dependencies, and for faking external APIs; JUnit (4 & 5) and TestNG test runners are supported. It also contains an advanced code coverage tool.
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/*
 * Copyright (c) 2006 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.faking;

import java.lang.reflect.*;
import java.util.*;
import javax.annotation.*;
import static java.lang.reflect.Modifier.*;

import mockit.internal.*;
import mockit.internal.reflection.*;
import mockit.internal.state.*;
import mockit.internal.util.*;
import mockit.internal.reflection.GenericTypeReflection.*;
import static mockit.internal.util.ObjectMethods.*;

/**
 * A container for the fake methods "collected" from a fake class, separated in two sets: one with all the fake methods,
 * and another with just the subset of static methods.
 */
final class FakeMethods
{
   @Nonnull private final Class realClass;
   private final boolean targetTypeIsAClass;
   private final boolean reentrantRealClass;
   @Nonnull private final List methods;
   @Nullable private FakeMethod adviceMethod;
   @Nonnull private final GenericTypeReflection typeParametersToTypeArguments;
   @Nonnull private String fakeClassInternalName;
   @Nullable private List fakeStates;

   final class FakeMethod
   {
      private final int access;
      @Nonnull final String name;
      @Nonnull final String desc;
      final boolean isAdvice;
      final boolean hasInvocationParameter;
      @Nonnull final String fakeDescWithoutInvocationParameter;
      private boolean hasMatchingRealMethod;
      @Nullable private GenericSignature fakeSignature;
      private int indexForFakeState;
      private boolean nativeRealMethod;

      private FakeMethod(int access, @Nonnull String name, @Nonnull String desc)
      {
         this.access = access;
         this.name = name;
         this.desc = desc;

         if (desc.contains("Lmockit/Invocation;")) {
            hasInvocationParameter = true;
            fakeDescWithoutInvocationParameter = '(' + desc.substring(20);
            isAdvice = "$advice".equals(name) && "()Ljava/lang/Object;".equals(fakeDescWithoutInvocationParameter);
         }
         else {
            hasInvocationParameter = false;
            fakeDescWithoutInvocationParameter = desc;
            isAdvice = false;
         }

         hasMatchingRealMethod = false;
         indexForFakeState = -1;
      }

      boolean isMatch(int realAccess, @Nonnull String realName, @Nonnull String realDesc, @Nullable String signature)
      {
         if (name.equals(realName) && hasMatchingParameters(realDesc, signature)) {
            hasMatchingRealMethod = true;
            nativeRealMethod = isNative(realAccess);
            return true;
         }

         return false;
      }

      private boolean hasMatchingParameters(@Nonnull String methodDesc, @Nullable String signature)
      {
         boolean sameParametersIgnoringGenerics = fakeDescWithoutInvocationParameter.equals(methodDesc);

         if (sameParametersIgnoringGenerics || signature == null) {
            return sameParametersIgnoringGenerics;
         }

         if (fakeSignature == null) {
            fakeSignature = typeParametersToTypeArguments.parseSignature(fakeDescWithoutInvocationParameter);
         }

         return fakeSignature.satisfiesGenericSignature(signature);
      }

      @Nonnull Class getRealClass() { return realClass; }
      @Nonnull String getFakeNameAndDesc() { return name + desc; }
      int getIndexForFakeState() { return indexForFakeState; }

      boolean isStatic() { return Modifier.isStatic(access); }
      boolean isPublic() { return Modifier.isPublic(access); }
      boolean isForGenericMethod() { return fakeSignature != null; }
      boolean isForNativeMethod() { return nativeRealMethod; }
      boolean requiresFakeState() { return hasInvocationParameter || reentrantRealClass; }
      boolean canBeReentered() { return targetTypeIsAClass && !nativeRealMethod; }

      @Override @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
      public boolean equals(Object obj)
      {
         FakeMethod other = (FakeMethod) obj;
         return realClass == other.getRealClass() && name.equals(other.name) && desc.equals(other.desc);
      }

      @Override
      public int hashCode()
      {
         return 31 * (31 * realClass.hashCode() + name.hashCode()) + desc.hashCode();
      }
   }

   FakeMethods(@Nonnull Class realClass, @Nullable Type targetType)
   {
      this.realClass = realClass;

      if (targetType == null || realClass == targetType) {
         targetTypeIsAClass = true;
      }
      else {
         Class targetClass = Utilities.getClassType(targetType);
         targetTypeIsAClass = !targetClass.isInterface();
      }

      reentrantRealClass = targetTypeIsAClass && ClassLoadingBridge.instanceOfClassThatParticipatesInClassLoading(realClass);
      methods = new ArrayList();
      typeParametersToTypeArguments = new GenericTypeReflection(realClass, targetType);
      fakeClassInternalName = "";
   }

   @Nonnull Class getRealClass() { return realClass; }

   @Nullable
   FakeMethod addMethod(boolean fromSuperClass, int access, @Nonnull String name, @Nonnull String desc)
   {
      if (fromSuperClass && isMethodAlreadyAdded(name, desc)) {
         return null;
      }

      FakeMethod fakeMethod = new FakeMethod(access, name, desc);

      if (fakeMethod.isAdvice) {
         adviceMethod = fakeMethod;
      }
      else {
         methods.add(fakeMethod);
      }

      return fakeMethod;
   }

   private boolean isMethodAlreadyAdded(@Nonnull String name, @Nonnull String desc)
   {
      int p = desc.lastIndexOf(')');
      String params = desc.substring(0, p + 1);

      for (FakeMethod fakeMethod : methods) {
         if (fakeMethod.name.equals(name) && fakeMethod.desc.startsWith(params)) {
            return true;
         }
      }

      return false;
   }

   void addFakeState(@Nonnull FakeState fakeState)
   {
      if (fakeStates == null) {
         fakeStates = new ArrayList(4);
      }

      fakeState.fakeMethod.indexForFakeState = fakeStates.size();
      fakeStates.add(fakeState);
   }

   /**
    * Finds a fake method with the same signature of a given real method, if previously collected from the fake class.
    * This operation can be performed only once for any given fake method in this container, so that after the last real
    * method is processed there should be no fake methods left unused in the container.
    */
   @Nullable
   FakeMethod findMethod(int access, @Nonnull String name, @Nonnull String desc, @Nullable String signature)
   {
      for (FakeMethod fakeMethod : methods) {
         if (fakeMethod.isMatch(access, name, desc, signature)) {
            return fakeMethod;
         }
      }

      if (
         adviceMethod != null && !isNative(access) && !"$init".equals(name) && !"$clinit".equals(name) &&
         !isMethodFromObject(name, desc)
      ) {
         return adviceMethod;
      }

      return null;
   }

   @Nonnull String getFakeClassInternalName() { return fakeClassInternalName; }

   void setFakeClassInternalName(@Nonnull String fakeClassInternalName)
   {
      this.fakeClassInternalName = fakeClassInternalName.intern();
   }

   boolean hasUnusedFakes()
   {
      if (adviceMethod != null) {
         return true;
      }

      for (FakeMethod method : methods) {
         if (!method.hasMatchingRealMethod) {
            return true;
         }
      }

      return false;
   }

   void registerFakeStates(@Nonnull Object fake, boolean forStartupFake)
   {
      if (fakeStates != null) {
         FakeStates allFakeStates = TestRun.getFakeStates();

         if (forStartupFake) {
            allFakeStates.addStartupFakeAndItsFakeStates(fake, fakeStates);
         }
         else {
            allFakeStates.addFakeAndItsFakeStates(fake, fakeStates);
         }
      }
   }
}