/// <summary>
/// Returns a <see cref="ClassContext"/> for the given target type, or <see langword="null" /> if the type is not configured in this
/// <see cref="MixinConfiguration"/>.
/// </summary>
/// <param name="targetOrConcreteType">Base type for which a context should be returned or a concrete mixed type.</param>
/// <returns>A <see cref="ClassContext"/> for the a given target type, or <see langword="null"/> if the type is not configured.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="targetOrConcreteType"/> parameter is <see langword="null"/>.</exception>
/// <remarks>
/// <para>
/// Use this to extract a class context for a given target type from an <see cref="MixinConfiguration"/> as it would be used for mixed type code
/// generation. Besides looking up the target type in the <see cref="ClassContexts"/> collection, this method also checks whether the class
/// context is empty, and returns <see langword="null" /> if so.
/// </para>
/// <para>
/// If <paramref name="targetOrConcreteType"/> is already a generated type, the <see cref="ClassContext"/> used for its generation is returned.
/// </para>
/// </remarks>
public ClassContext GetContext(Type targetOrConcreteType)
{
ArgumentUtility.CheckNotNull("targetOrConcreteType", targetOrConcreteType);
if (MixinTypeUtility.IsGeneratedConcreteMixedType(targetOrConcreteType))
{
var classContextForConcreteType = MixinTypeUtility.GetClassContextForConcreteType(targetOrConcreteType);
// Theoretically, classContextForConcreteType should never be null here. However, the heuristics of IsGeneratedConcreteMixedType can be
// wrong, which is why we allow for a null classContextForConcreteType in the assertion below.
Assertion.IsTrue(classContextForConcreteType == null || classContextForConcreteType.Type != targetOrConcreteType);
return(classContextForConcreteType);
}
ClassContext context = ClassContexts.GetWithInheritance(targetOrConcreteType);
Assertion.IsTrue(context == null || context.Type == targetOrConcreteType);
if (context == null || context.IsEmpty())
{
return(null);
}
else
{
return(context);
}
}
public void CircularSuppressingMixins()
{
MixinConfiguration configuration = new DeclarativeConfigurationBuilder(null)
.AddType(typeof(MixinWithCircularSuppress1))
.AddType(typeof(MixinWithCircularSuppress2))
.BuildConfiguration();
ClassContext classContext = configuration.ClassContexts.GetExact(typeof(ClassWithMixins));
Assert.That(classContext.IsEmpty(), Is.True);
}
public void IsEmpty_False_ComposedInterfaces()
{
var context = new ClassContext(typeof(BaseType1), new MixinContext[0], new[] { typeof(ICBT6Mixin3) });
Assert.That(context.IsEmpty(), Is.False);
}
