internal static DynamicUpdateMap Merge(DynamicUpdateMap first, DynamicUpdateMap second, MergeErrorContext errorContext)
{
if (first == null || second == null)
{
return(first ?? second);
}
if (first.IsNoChanges || second.IsNoChanges)
{
// DynamicUpdateMap.NoChanges has zero members, so we need to special-case it here.
return(first.IsNoChanges ? second : first);
}
ThrowIfMapsIncompatible(first, second, errorContext);
DynamicUpdateMap result = new DynamicUpdateMap
{
IsForImplementation = first.IsForImplementation,
NewDefinitionMemberCount = second.NewDefinitionMemberCount,
ArgumentsAreUnknown = first.ArgumentsAreUnknown && second.ArgumentsAreUnknown,
oldArguments = first.ArgumentsAreUnknown ? second.oldArguments : first.oldArguments,
newArguments = second.ArgumentsAreUnknown ? first.newArguments : second.newArguments
};
foreach (DynamicUpdateMapEntry firstEntry in first.Entries)
{
DynamicUpdateMapEntry parent = null;
if (firstEntry.Parent != null)
{
result.TryGetUpdateEntry(firstEntry.Parent.OldActivityId, out parent);
}
if (firstEntry.IsRemoval)
{
result.AddEntry(firstEntry.Clone(parent));
}
else
{
DynamicUpdateMapEntry secondEntry = second.entries[firstEntry.NewActivityId];
result.AddEntry(DynamicUpdateMapEntry.Merge(firstEntry, secondEntry, parent, errorContext));
}
}
return(result);
}
// Wrap an implementation map in a dummy map. This allows use of an implementation map as the
// root map in the case when the root is an x:Class with no public children.
internal DynamicUpdateMap AsRootMap()
{
Fx.Assert(this.IsForImplementation, "This should only be called on implementation map");
if (!ActivityComparer.ListEquals(this.NewArguments, this.OldArguments))
{
throw FxTrace.Exception.AsError(new InstanceUpdateException(SR.InvalidImplementationAsWorkflowRootForRuntimeStateBecauseArgumentsChanged));
}
DynamicUpdateMap result = new DynamicUpdateMap
{
IsImplementationAsRoot = true,
NewDefinitionMemberCount = 1
};
result.AddEntry(new DynamicUpdateMapEntry(1, 1)
{
ImplementationUpdateMap = this,
});
return(result);
}