private void createTheReturnValue(ParameterExpression variable, BlockPlan plan)
{
var label = Expression.Label(_pluginType);
Expression returnTarget = variable;
plan.Add(Expression.Return(label, returnTarget, _pluginType));
plan.Add(Expression.Label(label, variable));
}
private ParameterExpression addPluginTypeVariable(BlockPlan plan)
{
var pluginTypeVariable = plan.FindVariableOfType(_pluginType);
if (pluginTypeVariable == null)
{
pluginTypeVariable = Expression.Variable(_pluginType, "returnValue");
plan.AddVariable(pluginTypeVariable);
plan.Add(Expression.Assign(pluginTypeVariable, Expression.Convert(_variable, _pluginType)));
}
return(pluginTypeVariable);
}
public Expression ToExpression(ParameterExpression session, ParameterExpression context)
{
// Seed the plan with the inner value
var inner = _inner.ToExpression(session, context);
var plan = new BlockPlan();
plan.AddVariable(_variable);
var assignment = Expression.Assign(_variable, inner);
plan.Add(assignment);
addActivations(plan);
var pluginTypeVariable = addPluginTypeVariable(plan);
addDecorators(context, pluginTypeVariable, plan);
createTheReturnValue(pluginTypeVariable, plan);
return(plan.ToExpression());
}
private void addActivations(BlockPlan plan)
{
plan.AddVariables(_activators.SelectMany(x => x.ToParameterExpressions(_inner.ReturnedType)));
plan.Add(_activators.SelectMany(x => x.CreateExpressions(_policies, _variable)).ToArray());
}
private void addDecorators(ParameterExpression context, ParameterExpression pluginTypeVariable, BlockPlan plan)
{
_decorators.Each(decorator => {
var decoratedExpression = decorator.ToExpression(_policies, context, pluginTypeVariable);
var wrapped =
TryCatchWrapper.WrapFunc <StructureMapInterceptorException>(
"Decorator Interceptor failed during object construction. See the inner exception", _pluginType,
decoratedExpression, decorator);
plan.Add(Expression.Assign(pluginTypeVariable, wrapped));
});
}
