/// <summary>
/// Determines whether the value of the property along the source path has a value or not.
/// </summary>
/// <param name="root"></param>
/// <returns>True if the source path has an assigned value, otherwise false.</returns>
/// <remarks>
/// If any value along the source path is null, false will be returned.
/// If the source property is a list, false will be returned if the list is empty.
/// </remarks>
public bool HasValue(ModelInstance root)
{
// Get the source
IModelPropertySource source = GetSource(root);
// Return false if the source is null
if (source == null)
{
return(false);
}
// Get the property off of the source to evaluate
ModelProperty property = source.Properties[SourceProperty];
// If the property is a list, determine if the list has items
if (property is ModelReferenceProperty && property.IsList)
{
return(source.GetList((ModelReferenceProperty)property).Count > 0);
}
// Otherwise, just determine if the property has an assigned value
else
{
return(source[property] != null);
}
}
/// <summary>
/// Gets the serializable value of a <see cref="ModelProperty"/>.
/// </summary>
/// <param name="property"></param>
/// <param name="source"></param>
/// <returns></returns>
internal static object GetPropertyValue(ModelProperty property, IModelPropertySource source)
{
ModelReferenceProperty reference = property as ModelReferenceProperty;
if (reference != null)
{
// Serialize lists
if (reference.IsList)
{
return(source.GetList(reference).Select(item => GetReference(reference, item)));
}
// Serialize references
else
{
return(GetReference(reference, source.GetReference(reference)));
}
}
// Serialize values
else
{
return(source.GetValue((ModelValueProperty)property));
}
}
public bool SetValue(ModelInstance root, object value, Func <ModelInstance, ModelReferenceProperty, int, bool> whenNull, Action <ModelInstance, ModelReferenceProperty, int, ModelInstance> whenNotNull)
{
IModelPropertySource sourceInstance = GetSource(root, whenNull, whenNotNull);
sourceInstance[SourceProperty] = value;
return(true);
}
/// <summary>
/// Gets the formatted value of the property for the current source path.
/// </summary>
public string GetFormattedValue(ModelInstance root, string format, IFormatProvider provider, out object rawValue)
{
IModelPropertySource source = GetSource(root);
if (source == null)
{
rawValue = null;
return(null);
}
rawValue = source[SourceProperty];
return(source.GetFormattedValue(SourceProperty, format));
}
/// <summary>
/// Gets the serializable value of a <see cref="ModelProperty"/>.
/// </summary>
/// <param name="property"></param>
/// <param name="source"></param>
/// <returns></returns>
internal static object GetPropertyValue(ModelProperty property, IModelPropertySource source)
{
ModelReferenceProperty reference = property as ModelReferenceProperty;
if (reference != null)
{
// Serialize lists
if (reference.IsList)
return source.GetList(reference).Select(item => GetReference(reference, item));
// Serialize references
else
return GetReference(reference, source.GetReference(reference));
}
// Serialize values
else
return source.GetValue((ModelValueProperty)property);
}
/// <summary>
/// Gets the <see cref="ModelInstance"/> defined by specified source path.
/// </summary>
/// <param name="root"></param>
/// <returns></returns>
public ModelInstance GetReference(ModelInstance root)
{
IModelPropertySource source = GetSource(root);
return(source == null ? null : source.GetReference(SourceProperty));
}
/// <summary>
/// Gets the <see cref="ModelInstanceList"/> defined by specified source path.
/// </summary>
/// <param name="root"></param>
/// <returns></returns>
public ModelInstanceList GetList(ModelInstance root)
{
IModelPropertySource source = GetSource(root);
return(source == null ? null : source.GetList(SourceProperty));
}
/// <summary>
/// Gets the formatted value of the property for the current source path.
/// </summary>
/// <param name="root"></param>
/// <param name="format">The specific format to use</param>
/// <returns></returns>
public string GetFormattedValue(ModelInstance root, string format)
{
IModelPropertySource source = GetSource(root);
return(source == null ? null : source.GetFormattedValue(SourceProperty, format));
}
/// <summary>
/// Gets the underlying value of the property for the current source path.
/// </summary>
/// <param name="root"></param>
/// <returns></returns>
public object GetValue(ModelInstance root)
{
IModelPropertySource source = GetSource(root);
return(source == null ? null : source[SourceProperty]);
}
