/// <summary>
/// Extend selection syntax for nodes to handle global and meta parameters through
/// # and $ prefixes
/// </summary>
/// <param name="path">The path to select</param>
/// <param name="frame">The data frame to select off</param>
/// <param name="node">The current node</param>
/// <param name="globalMeta">Global meta</param>
/// <param name="properties">Property bag</param>
/// <param name="uuid">The uuid for private names</param>
/// <param name="meta">Meta</param>
/// <returns>An array of nodes</returns>
public static DataNode[] SelectNodes(string path, DataFrame frame, MetaDictionary meta, MetaDictionary globalMeta,
PropertyBag properties, Guid uuid, BasePipelineNode node)
{
DataNode[] nodes = new DataNode[0];
path = path.Trim();
if (path.StartsWith("#"))
{
if (meta != null)
{
string name = path.Substring(1);
object n = meta.GetMeta(MakePrivateMetaName(uuid, name));
if(n == null)
{
n = meta.GetMeta(name);
}
if (n != null)
{
nodes = new DataNode[1];
nodes[0] = new StringDataValue(path, n.ToString());
}
}
}
else if (path.StartsWith("$"))
{
if (globalMeta != null)
{
string name = path.Substring(1);
object n = globalMeta.GetMeta(MakePrivateMetaName(uuid, name));
if (n == null)
{
n = globalMeta.GetMeta(name);
}
if (n != null)
{
nodes = new DataNode[1];
nodes[0] = new StringDataValue(path, n.ToString());
}
}
}
else if (path.StartsWith("~"))
{
if(properties != null)
{
string name = path.Substring(1);
dynamic val = properties.GetRelativeValue(name);
if (val != null)
{
nodes = new DataNode[1];
nodes[0] = new StringDataValue(path, val.ToString());
}
}
}
else if (path.StartsWith("&"))
{
DataNode n = null;
if (path.Equals("&incount", StringComparison.OrdinalIgnoreCase))
{
n = new GenericDataValue<int>(path, node != null ? node.InputPacketCount : 0);
}
else if (path.Equals("&outcount", StringComparison.OrdinalIgnoreCase))
{
n = new GenericDataValue<int>(path, node != null ? node.OutputPacketCount : 0);
}
else if (path.Equals("&bytecount", StringComparison.OrdinalIgnoreCase))
{
n = new GenericDataValue<long>(path, node != null ? node.ByteCount : 0);
}
else if (path.Equals("&length", StringComparison.OrdinalIgnoreCase))
{
n = new GenericDataValue<long>(path, frame.Length);
}
else if (path.Equals("&md5", StringComparison.OrdinalIgnoreCase))
{
n = new StringDataValue(path, frame.Hash);
}
else if (path.Equals("&display", StringComparison.OrdinalIgnoreCase))
{
n = new StringDataValue(path, frame.ToString());
}
if (n != null)
{
nodes = new DataNode[1];
nodes[0] = n;
}
}
else
{
nodes = frame.SelectNodes(path);
}
return nodes;
}
