/// <summary>
/// Transfers attributes from another <see cref="Element"/> object to this one.
/// Existing values are not replaced. Provides an inheritance-like relation.
/// </summary>
/// <param name="parent">The object to take the attributes from.</param>
internal void InheritFrom([NotNull] Element parent)
{
#region Sanity checks
if (parent == null)
{
throw new ArgumentNullException(nameof(parent));
}
#endregion
// Check if values are unset and need inheritance)
if (Version == null)
{
Version = parent.Version;
}
if (VersionModifier == null)
{
VersionModifier = parent.VersionModifier;
}
if (Released == default(DateTime))
{
Released = parent.Released;
}
if (Main == null)
{
Main = parent.Main;
}
if (SelfTest == null)
{
SelfTest = parent.SelfTest;
}
if (DocDir == null)
{
DocDir = parent.DocDir;
}
if (License == null)
{
License = parent.License;
}
if (Stability == Stability.Unset)
{
Stability = parent.Stability;
}
if (Languages.Count == 0)
{
Languages = new LanguageSet(parent.Languages);
}
if (Architecture == default(Architecture))
{
Architecture = parent.Architecture;
}
// Accumulate list entries
Commands.AddRange(parent.Commands);
Dependencies.AddRange(parent.Dependencies);
Restrictions.AddRange(parent.Restrictions);
Bindings.AddRange(parent.Bindings);
}