/// <summary>
/// Initializes an area from a directory.
/// </summary>
public AreaState(ISystemContext context, DirectoryInfo directoryInfo) : base(null)
{
directoryInfo.Refresh();
string name = directoryInfo.Name;
// need to read the correct casing from the file system.
if (directoryInfo.Exists)
{
DirectoryInfo[] directories = directoryInfo.Parent.GetDirectories(name);
if (directories != null && directories.Length > 0)
{
name = directories[0].Name;
}
}
// get the system to use.
FileSystemMonitor system = context.SystemHandle as FileSystemMonitor;
if (system != null)
{
this.NodeId = system.CreateNodeIdFromDirectoryPath(ObjectTypes.AreaType, directoryInfo.FullName);
this.BrowseName = new QualifiedName(name, system.NamespaceIndex);
this.OnValidate = system.ValidateArea;
}
this.DisplayName = new LocalizedText(name);
this.EventNotifier = EventNotifiers.None;
this.TypeDefinitionId = GetDefaultTypeDefinitionId(context.NamespaceUris);
}
/// <summary>
/// Initializes the node manager.
/// </summary>
public FileSystemNodeManager(Opc.Ua.Server.IServerInternal server, string systemRoot)
:
base(server)
{
List <string> namespaceUris = new List <string>();
namespaceUris.Add(Namespaces.FileSystem);
namespaceUris.Add(Namespaces.FileSystem + "/Instance");
NamespaceUris = namespaceUris;
m_cache = new NodeIdDictionary <NodeState>();
// create the directory.
string absolutePath = Utils.GetAbsoluteDirectoryPath(systemRoot, true, false, true);
// create the system.
m_system = new FileSystemMonitor(
SystemContext,
absolutePath,
server.NamespaceUris.GetIndexOrAppend(namespaceUris[1]),
Lock);
// update the default context.
SystemContext.SystemHandle = m_system;
}
/// <summary>
/// Initializes the node manager.
/// </summary>
public FileSystemNodeManager(Opc.Ua.Server.IServerInternal server, string systemRoot)
:
base(server)
{
List<string> namespaceUris = new List<string>();
namespaceUris.Add(Namespaces.FileSystem);
namespaceUris.Add(Namespaces.FileSystem + "/Instance");
NamespaceUris = namespaceUris;
m_cache = new NodeIdDictionary<NodeState>();
// create the directory.
string absolutePath = Utils.GetAbsoluteDirectoryPath(systemRoot, true, false, true);
// create the system.
m_system = new FileSystemMonitor(
SystemContext,
absolutePath,
server.NamespaceUris.GetIndexOrAppend(namespaceUris[1]),
Lock);
// update the default context.
SystemContext.SystemHandle = m_system;
}
/// <summary>
/// Returns a unique handle for the node.
/// </summary>
/// <remarks>
/// This must efficiently determine whether the node belongs to the node manager. If it does belong to
/// NodeManager it should return a handle that does not require the NodeId to be validated again when
/// the handle is passed into other methods such as 'Read' or 'Write'.
/// </remarks>
protected override object GetManagerHandle(ISystemContext context, NodeId nodeId, IDictionary <NodeId, NodeState> cache)
{
lock (Lock)
{
if (!IsNodeIdInNamespace(nodeId))
{
return(null);
}
// check for cached node.
NodeState node = null;
if (m_cache.TryGetValue(nodeId, out node))
{
return(node);
}
// check for a dynamic node.
object handle = FileSystemMonitor.CreateHandleFromNodeId(context, nodeId, cache);
if (handle != null)
{
return(handle);
}
// base class will look up predefined nodes.
return(base.GetManagerHandle(context, nodeId, cache));
}
}
/// <summary>
/// Creates a new controller file.
/// </summary>
private ServiceResult OnCreateController(
ISystemContext context,
MethodState method,
NodeId objectId,
string name,
ref NodeId nodeId)
{
nodeId = null;
// get the system to use.
FileSystemMonitor system = context.SystemHandle as FileSystemMonitor;
if (system == null)
{
return(StatusCodes.BadOutOfService);
}
// get the current dierctory.
DirectoryInfo directory = GetDirectory(context, this.NodeId);
if (directory == null || !directory.Exists)
{
return(StatusCodes.BadOutOfService);
}
// build the file path.
StringBuilder filePath = new StringBuilder();
filePath.Append(directory.FullName);
filePath.Append('\\');
filePath.Append(name);
filePath.Append(".csv");
if (File.Exists(filePath.ToString()))
{
return(StatusCodes.BadNodeIdExists);
}
// write a dummy configuration file.
try
{
using (StreamWriter writer = new StreamWriter(filePath.ToString()))
{
writer.WriteLine("Temperature, Double, 15");
writer.WriteLine("TemperatureSetPoint, Double, 15");
}
}
catch (Exception e)
{
return(new ServiceResult(e, StatusCodes.BadUnexpectedError));
}
// return the node id.
nodeId = system.CreateNodeIdFromFilePath(ObjectTypes.ControllerType, filePath.ToString());
return(ServiceResult.Good);
}
/// <summary>
/// Returns the next child with the requested browse name.
/// </summary>
private IReference FindByBrowseName()
{
NodeState target = null;
// check if match found previously.
if (m_position == UInt32.MaxValue)
{
return(null);
}
// get the system to use.
FileSystemMonitor system = SystemContext.SystemHandle as FileSystemMonitor;
if (system == null)
{
return(null);
}
// browse name must be qualified by the correct namespace.
if (system.NamespaceIndex != base.BrowseName.NamespaceIndex)
{
return(null);
}
// look for file.
FileInfo[] files = m_area.GetFiles(Utils.Format("{0}.csv", base.BrowseName.Name));
if (files != null && files.Length > 0)
{
target = new ControllerState(SystemContext, files[0]);
}
// look for directory
if (target == null)
{
DirectoryInfo[] directories =
m_area.GetDirectories(base.BrowseName.Name, SearchOption.TopDirectoryOnly);
if (directories == null || directories.Length <= 0)
{
return(null);
}
target = new AreaState(SystemContext, directories[0]);
}
// match found.
m_position = UInt32.MaxValue;
// return the requested reference type.
return(new NodeStateReference(ReferenceTypeIds.Organizes, false, target));
}
/// <summary>
/// Returns the directory for the area.
/// </summary>
public static DirectoryInfo GetDirectory(ISystemContext context, NodeId areaId)
{
FileSystemMonitor system = context.SystemHandle as FileSystemMonitor;
if (system == null)
{
return(null);
}
string directoryPath = system.ExtractPathFromNodeId(areaId);
return(new DirectoryInfo(directoryPath));
}
/// <summary>
/// Returns the file for the controller.
/// </summary>
public static FileInfo GetFile(ISystemContext context, NodeId controllerId)
{
FileSystemMonitor system = context.SystemHandle as FileSystemMonitor;
if (system == null)
{
return(null);
}
string filePath = system.ExtractPathFromNodeId(controllerId);
filePath += ".csv";
return(new FileInfo(filePath));
}
/// <summary>
/// Initializes a controller from a file.
/// </summary>
public ControllerState(ISystemContext context, FileInfo fileInfo) : base(null)
{
fileInfo.Refresh();
// extract the display name from the original file path.
string name = fileInfo.Name;
// need to read the correct casing from the file system.
if (fileInfo.Exists)
{
FileInfo[] files = fileInfo.Directory.GetFiles(name);
if (files != null && files.Length > 0)
{
name = files[0].Name;
}
}
int index = name.LastIndexOf('.');
if (index >= 0)
{
name = name.Substring(0, index);
}
// get the system to use.
FileSystemMonitor system = context.SystemHandle as FileSystemMonitor;
if (system != null)
{
this.NodeId = system.CreateNodeIdFromFilePath(ObjectTypes.ControllerType, fileInfo.FullName);
this.BrowseName = new QualifiedName(name, system.NamespaceIndex);
this.OnValidate = system.ValidateController;
}
this.DisplayName = new LocalizedText(name);
this.EventNotifier = EventNotifiers.None;
this.TypeDefinitionId = GetDefaultTypeDefinitionId(context.NamespaceUris);
}
/// <summary>
/// Creates the appropriate NodeState object from a NodeId.
/// </summary>
public static NodeState CreateHandleFromNodeId(
ISystemContext context,
NodeId nodeId,
IDictionary <NodeId, NodeState> cache)
{
// get the system to use.
FileSystemMonitor system = context.SystemHandle as FileSystemMonitor;
if (system == null)
{
return(null);
}
// check for valid node id.
if (nodeId == null || nodeId.NamespaceIndex != system.m_namespaceIndex || nodeId.IdType != IdType.String)
{
return(null);
}
// lookup in cache.
NodeState state = null;
if (cache != null)
{
if (cache.TryGetValue(nodeId, out state))
{
return(state);
}
}
string path = (string)nodeId.Identifier;
uint baseline = (uint)Convert.ToUInt32('0');
// parse the object type id.
uint objectTypeId = 0;
int start = 0;
for (int ii = 0; ii < path.Length; ii++)
{
if (path[ii] == ':')
{
start = ii + 1;
break;
}
if (!Char.IsDigit(path[ii]))
{
return(null);
}
objectTypeId *= 10;
objectTypeId += (uint)Convert.ToUInt32(path[ii]) - baseline;
}
string parentPath = path;
NodeId parentId = nodeId;
// check if referencing a child of the object.
int end = -1;
if (start < path.Length)
{
end = path.IndexOf(':', start);
if (end >= start)
{
parentPath = path.Substring(0, end);
parentId = new NodeId(parentPath, system.NamespaceIndex);
}
}
// return cached value if available.
if (cache != null)
{
if (!cache.TryGetValue(parentId, out state))
{
state = null;
}
}
// create the object instance.
if (state == null)
{
switch (objectTypeId)
{
case ObjectTypes.AreaType:
{
string directoryPath = system.ExtractPathFromNodeId(nodeId);
state = new AreaState(context, new DirectoryInfo(directoryPath));
break;
}
case ObjectTypes.ControllerType:
{
string filePath = system.ExtractPathFromNodeId(nodeId);
filePath += ".csv";
state = new ControllerState(context, new FileInfo(filePath));
break;
}
default:
{
return(null);
}
}
// update cache if provided.
if (cache != null)
{
cache[parentId] = state;
}
}
// nothing more to do if referencing the root.
if (end < 0)
{
return(state);
}
// create the child identified by the name in the node id.
string childPath = path.Substring(end + 1);
// extract path of children.
List <string> childNames = new List <string>();
int index = childPath.IndexOf(':');
while (index > 0)
{
childNames.Add(childPath.Substring(0, index));
childPath = childPath.Substring(index + 1);
index = childPath.IndexOf(':');
}
childNames.Add(childPath);
NodeState parent = state;
BaseInstanceState child = null;
for (int ii = 0; ii < childNames.Count; ii++)
{
child = parent.CreateChild(
context,
new QualifiedName(childNames[ii], 0));
if (child == null)
{
return(null);
}
parent = child;
if (ii == childNames.Count - 1)
{
child.NodeId = nodeId;
if (state.ValidationRequired)
{
child.OnValidate = system.ValidateChild;
}
if (cache != null)
{
cache[nodeId] = child;
}
}
}
return(child);
}
