/// <summary>
/// Called during the chain of responsibility for a build operation.
/// </summary>
/// <remarks>Existing object is an instance of <see cref="DynamicBuildPlanGenerationContext"/>.</remarks>
/// <param name="context">The context for the operation.</param>
public override void PreBuildUp(IBuilderContext context)
{
DynamicBuildPlanGenerationContext buildContext =
(DynamicBuildPlanGenerationContext)(context ?? throw new ArgumentNullException(nameof(context))).Existing;
GuardTypeIsNonPrimitive(context);
buildContext.AddToBuildPlan(
Expression.IfThen(
Expression.Equal(
buildContext.GetExistingObjectExpression(),
Expression.Constant(null)),
CreateInstanceBuildupExpression(buildContext, context)));
buildContext.AddToBuildPlan(
Expression.Call(null, SetPerBuildSingletonMethod, buildContext.ContextParameter));
}
private IEnumerable <Expression> CreateNewBuildupSequence(DynamicBuildPlanGenerationContext buildContext, SelectedConstructor selectedConstructor, string signature)
{
var parameterExpressions = BuildConstructionParameterExpressions(buildContext, selectedConstructor, signature);
var newItemExpression = Expression.Variable(selectedConstructor.Constructor.DeclaringType, "newItem");
yield return(Expression.Call(null,
SetCurrentOperationToInvokingConstructorMethod,
Expression.Constant(signature),
buildContext.ContextParameter));
yield return(Expression.Assign(
buildContext.GetExistingObjectExpression(),
Expression.Convert(
Expression.New(selectedConstructor.Constructor, parameterExpressions),
typeof(object))));
yield return(buildContext.GetClearCurrentOperationExpression());
}