/// <summary>
/// Initializes a new instance of the <see cref="BlockState"/> class.
/// </summary>
/// <param name="nodeManager">The context.</param>
/// <param name="nodeId">The node id.</param>
/// <param name="block">The block.</param>
public BlockState(
DataAccessNodeManager nodeManager,
NodeId nodeId,
UnderlyingSystemBlock block) : base(null)
{
_blockId = block.Id;
_nodeManager = nodeManager;
SymbolicName = block.Name;
NodeId = nodeId;
BrowseName = new QualifiedName(block.Name, nodeId.NamespaceIndex);
DisplayName = new LocalizedText(block.Name);
Description = null;
WriteMask = 0;
UserWriteMask = 0;
EventNotifier = EventNotifiers.None;
if (nodeManager.SystemContext.SystemHandle is UnderlyingSystem system)
{
var tags = block.GetTags();
for (var ii = 0; ii < tags.Count; ii++)
{
var variable = CreateVariable(nodeManager.SystemContext, tags[ii]);
AddChild(variable);
variable.OnSimpleWriteValue = OnWriteTagValue;
}
}
}
/// <summary>
/// Finds a block.
/// </summary>
/// <param name="blockId">The block identifier.</param>
/// <returns>The block.</returns>
public UnderlyingSystemBlock FindBlock(string blockId)
{
UnderlyingSystemBlock block = null;
lock (_lock) {
// check for invalid name.
if (string.IsNullOrEmpty(blockId))
{
return(null);
}
// look for cached block.
if (_blocks.TryGetValue(blockId, out block))
{
return(block);
}
// lookup block in database.
string blockType = null;
var length = blockId.Length;
for (var ii = 0; ii < s_BlockDatabase.Length; ii++)
{
blockType = s_BlockDatabase[ii];
if (length >= blockType.Length || blockType[length] != '/')
{
continue;
}
if (blockType.StartsWith(blockId, StringComparison.Ordinal))
{
blockType = blockType.Substring(length + 1);
break;
}
blockType = null;
}
// block not found.
if (blockType == null)
{
return(null);
}
// create a new block.
block = new UnderlyingSystemBlock {
// create the block.
Id = blockId,
Name = blockId,
BlockType = blockType
};
_blocks.Add(blockId, block);
// add the tags based on the block type.
// note that the block and tag types used here are types defined by the underlying system.
// the node manager will need to map these types to UA defined types.
switch (block.BlockType)
{
case "FlowSensor": {
block.CreateTag("Measurement", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Analog, "liters/sec", false);
block.CreateTag("Online", UnderlyingSystemDataType.Integer1, UnderlyingSystemTagType.Digital, null, false);
break;
}
case "LevelSensor": {
block.CreateTag("Measurement", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Analog, "liters", false);
block.CreateTag("Online", UnderlyingSystemDataType.Integer1, UnderlyingSystemTagType.Digital, null, false);
break;
}
case "Controller": {
block.CreateTag("SetPoint", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Normal, null, true);
block.CreateTag("Measurement", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Normal, null, false);
block.CreateTag("Output", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Normal, null, false);
block.CreateTag("Status", UnderlyingSystemDataType.Integer4, UnderlyingSystemTagType.Enumerated, null, false);
break;
}
case "CustomController": {
block.CreateTag("Input1", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Normal, null, true);
block.CreateTag("Input2", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Normal, null, true);
block.CreateTag("Input3", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Normal, null, true);
block.CreateTag("Output", UnderlyingSystemDataType.Real4, UnderlyingSystemTagType.Normal, null, false);
break;
}
}
}
// return the new block.
return(block);
}
