/// <summary>
/// Indexer for attribute selection, processing constructed attributes.
/// </summary>
/// <param name="name">The display name of the attribute</param>
/// <returns>The value of the attribute which is computed if constructed or retrieved from the
/// attribute list otherwise. Is null if the attribute has not value associated.</returns>
public Value this[string name]
{
get
{
name = name.ToLower();
ConstructedAttributeGetter getter;
if (constructedAttributeGetters.TryGetValue(name, out getter))
{
// This is a constructed attribute and has a special meaning
return(getter(this));
}
else
{
// This is a stored attribute and is handled generically
Value result;
if (attributes.TryGetValue(name, out result))
{
return(result);
}
else
{
return(null);
}
}
}
set
{
name = name.ToLower();
Assert.IsTrue(
!constructedAttributeGetters.ContainsKey(name),
"constructed attribute '{0}' cannot be set",
name);
attributes[name] = value;
}
}
