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//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------
namespace System.Activities.Presentation.Xaml
{
using System.Activities.Presentation.Model;
using System.Collections.Generic;
internal static class ActivityBuilderHelper
{
internal static bool IsActivityBuilderType(ModelItem modelItem)
{
if (null == modelItem)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("modelItem"));
}
return modelItem.ItemType.IsAssignableFrom(typeof(ActivityBuilder));
}
internal static List<Variable> GetVariables(object input)
{
if (null == input)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("input"));
}
ModelItem astAsModelItem = input as ModelItem;
ActivityBuilder instance = input as ActivityBuilder;
if (null != astAsModelItem)
{
if (!astAsModelItem.ItemType.IsAssignableFrom(typeof(ActivityBuilder)))
{
throw FxTrace.Exception.AsError(new InvalidCastException(astAsModelItem.ItemType.FullName));
}
instance = (ActivityBuilder)astAsModelItem.GetCurrentValue();
}
else if (null == instance)
{
throw FxTrace.Exception.AsError(new InvalidCastException(input.GetType().FullName));
}
List<Variable> variables = new List<Variable>();
foreach (DynamicActivityProperty property in instance.Properties)
{
if (property != null)
{
Variable autoVariable = GetVariableFromProperty(property);
if (autoVariable != null)
{
variables.Add(autoVariable);
}
}
}
return variables;
}
internal static Variable GetVariableFromProperty(DynamicActivityProperty property)
{
Type variableType = null;
Variable autoVariable = null;
if (property.Type != null)
{
Type propertyType = property.Type;
// if the property is an Argument<T> create a variable of type T
if (propertyType != null && typeof(Argument).IsAssignableFrom(propertyType))
{
if (propertyType.IsGenericType)
{
variableType = propertyType.GetGenericArguments()[0];
}
else
{
variableType = typeof(object);
}
}
}
if (variableType != null)
{
autoVariable = Variable.Create(property.Name, variableType, VariableModifiers.None);
Argument argument = property.Value as Argument;
if (argument != null)
{
autoVariable.Default = argument.Expression;
}
}
return autoVariable;
}
}
}
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