/// <summary>
/// Allocates and marshals an OPCBROWSEELEMENT structure.
/// </summary>
internal static OpcRcw.Da.OPCBROWSEELEMENT GetBrowseElement(BrowseElement input)
{
OpcRcw.Da.OPCBROWSEELEMENT output = new OpcRcw.Da.OPCBROWSEELEMENT();
if (input != null)
{
output.szName = input.Name;
output.szItemID = input.ItemId;
output.dwFlagValue = 0;
output.ItemProperties = GetItemProperties(input.Properties);
if (input.IsItem)
{
output.dwFlagValue |= OpcRcw.Da.Constants.OPC_BROWSE_ISITEM;
}
if (input.HasChildren)
{
output.dwFlagValue |= OpcRcw.Da.Constants.OPC_BROWSE_HASCHILDREN;
}
}
return output;
}
/// <summary>
/// Applies the browse filters to a set of references.
/// </summary>
private void ApplyFilters(
ReferenceDescriptionCollection currentBatch,
OPCBROWSEFILTER dwBrowseFilter,
string szElementNameFilter,
int maxReferencesReturned,
IList<BrowseElement> filteredResults,
IList<BrowseElement> unprocessedResults)
{
// apply the filters to each item in the batch.
foreach (ReferenceDescription reference in currentBatch)
{
// check for a valid node.
INode target = m_session.NodeCache.FetchNode(reference.NodeId);
if (target == null)
{
continue;
}
// create the browse element.
BrowseElement element = new BrowseElement();
element.Node = target;
element.Name = target.BrowseName.Name;
element.ItemId = NodeIdToItemId(target.NodeId);
// apply the element name filter.
if (!String.IsNullOrEmpty(szElementNameFilter))
{
if (!ComUtils.Match(element.Name, szElementNameFilter, true))
{
continue;
}
}
element.IsItem = IsItem(target);
element.HasChildren = HasChildren(target);
// apply the browse filter.
if (dwBrowseFilter != OPCBROWSEFILTER.OPC_BROWSE_FILTER_ALL)
{
if (dwBrowseFilter == OPCBROWSEFILTER.OPC_BROWSE_FILTER_ITEMS)
{
if (!element.IsItem)
{
continue;
}
}
else
{
if (!element.HasChildren)
{
continue;
}
}
}
// must save the results to return in a subsequent browse.
if (maxReferencesReturned != 0 && filteredResults.Count >= maxReferencesReturned)
{
unprocessedResults.Add(element);
}
// can return the results in this browse.
else
{
filteredResults.Add(element);
}
}
}