/// <summary>
/// Merges two Diff operation into a single operation.
/// </summary>
static public DiffOperation Merge(DiffOperation left, DiffOperation right)
{
// Remove always trumps other operations.
if (right is RemoveOperation)
{
return(right);
}
if (left is RemoveOperation)
{
return(left);
}
// Change operation trumps other operations and right changes take precedence over
// left changes.
if (right is ChangeOperation)
{
return(right);
}
if (left is ChangeOperation)
{
return(left);
}
// Recursively merge array and object operations.
System.Diagnostics.Debug.Assert(left.GetType() == right.GetType());
if (left is ChangeObjectOperation)
{
return(ChangeObjectOperation.Merge(left as ChangeObjectOperation, right as ChangeObjectOperation));
}
if (left is ChangePositionArrayOperation)
{
return(ChangePositionArrayOperation.Merge(left as ChangePositionArrayOperation, right as ChangePositionArrayOperation));
}
if (left is ChangeIdArrayOperation)
{
return(ChangeIdArrayOperation.Merge(left as ChangeIdArrayOperation, right as ChangeIdArrayOperation));
}
System.Diagnostics.Debug.Assert(false);
return(null);
}
public static ChangeObjectOperation Merge(ChangeObjectOperation left, ChangeObjectOperation right)
{
return(new ChangeObjectOperation(HashDiff.Merge(left.Diff, right.Diff)));
}