static void ThrowIfMapsIncompatible(DynamicUpdateMap first, DynamicUpdateMap second, MergeErrorContext errorContext)
{
Fx.Assert(!first.IsNoChanges && !second.IsNoChanges, "This method is never supposed to be called on the NoChanges map.");
if (first.IsForImplementation != second.IsForImplementation)
{
errorContext.Throw(SR.InvalidMergeMapForImplementation(first.IsForImplementation, second.IsForImplementation));
}
if (first.NewDefinitionMemberCount != second.OldDefinitionMemberCount)
{
errorContext.Throw(SR.InvalidMergeMapMemberCount(first.NewDefinitionMemberCount, second.OldDefinitionMemberCount));
}
if (!first.ArgumentsAreUnknown && !second.ArgumentsAreUnknown && first.IsForImplementation &&
!ActivityComparer.ListEquals(first.newArguments, second.oldArguments))
{
if (first.NewArguments.Count != second.OldArguments.Count)
{
errorContext.Throw(SR.InvalidMergeMapArgumentCount(first.NewArguments.Count, second.OldArguments.Count));
}
else
{
errorContext.Throw(SR.InvalidMergeMapArgumentsChanged);
}
}
}
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);
}
