/// <summary>
/// Returns the select clause defined by the filter declaration.
/// </summary>
private SimpleAttributeOperandCollection GetSelectClause()
{
SimpleAttributeOperandCollection selectClause = new SimpleAttributeOperandCollection();
// add the explicitly selected attributes.
foreach (AeEventAttribute attribute in SelectedAttributes)
{
if (attribute != null)
{
SimpleAttributeOperand operand = new SimpleAttributeOperand();
operand.TypeDefinitionId = attribute.RootTypeId;
operand.AttributeId = (attribute.NodeClass == NodeClass.Object) ? Attributes.NodeId : Attributes.Value;
operand.BrowsePath = attribute.BrowsePath;
selectClause.Add(operand);
}
}
// need to request the condition id if condition events selected.
if ((EventTypes & OpcRcw.Ae.Constants.CONDITION_EVENT) != 0)
{
SimpleAttributeOperand operand = new SimpleAttributeOperand();
operand.TypeDefinitionId = Opc.Ua.ObjectTypeIds.ConditionType;
operand.AttributeId = Attributes.NodeId;
operand.BrowsePath.Clear();
selectClause.Add(operand);
}
return(selectClause);
}
/// <summary>
/// Returns the select clause defined by the filter declaration.
/// </summary>
public SimpleAttributeOperandCollection GetSelectClause()
{
SimpleAttributeOperandCollection selectClause = new SimpleAttributeOperandCollection();
SimpleAttributeOperand operand = new SimpleAttributeOperand();
operand.TypeDefinitionId = Opc.Ua.ObjectTypeIds.BaseEventType;
operand.AttributeId = Attributes.NodeId;
selectClause.Add(operand);
foreach (FilterDeclarationField field in Fields)
{
if (field.Selected)
{
operand = new SimpleAttributeOperand();
operand.TypeDefinitionId = field.InstanceDeclaration.RootTypeId;
operand.AttributeId = (field.InstanceDeclaration.NodeClass == NodeClass.Object)
? Attributes.NodeId
: Attributes.Value;
operand.BrowsePath = field.InstanceDeclaration.BrowsePath;
selectClause.Add(operand);
}
}
return(selectClause);
}
/// <summary>
/// Constructs the select clauses for a set of event types.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="eventTypeIds">The event type ids.</param>
/// <returns>The select clauses for all fields discovered.</returns>
/// <remarks>
/// Each event type is an ObjectType in the address space. The fields supported by the
/// server are defined as children of the ObjectType. Many of the fields are manadatory
/// and are defined by the UA information model, however, indiviudual servers many not
/// support all of the optional fields.
///
/// This method browses the type model and
/// </remarks>
public SimpleAttributeOperandCollection ConstructSelectClauses(
Session session,
params NodeId[] eventTypeIds)
{
// browse the type model in the server address space to find the fields available for the event type.
SimpleAttributeOperandCollection selectClauses = new SimpleAttributeOperandCollection();
// must always request the NodeId for the condition instances.
// this can be done by specifying an operand with an empty browse path.
SimpleAttributeOperand operand = new SimpleAttributeOperand();
operand.TypeDefinitionId = ObjectTypeIds.BaseEventType;
operand.AttributeId = Attributes.NodeId;
operand.BrowsePath = new QualifiedNameCollection();
selectClauses.Add(operand);
// add the fields for the selected EventTypes.
if (eventTypeIds != null)
{
for (int ii = 0; ii < eventTypeIds.Length; ii++)
{
CollectFields(session, eventTypeIds[ii], selectClauses);
}
}
// use BaseEventType as the default if no EventTypes specified.
else
{
CollectFields(session, ObjectTypeIds.BaseEventType, selectClauses);
}
return(selectClauses);
}
/// <summary>
/// Returns the SelectClauses in the control.
/// </summary>
public SimpleAttributeOperandCollection GetSelectClauses()
{
SimpleAttributeOperandCollection clauses = new SimpleAttributeOperandCollection();
foreach (ListViewItem listItem in ItemsLV.Items)
{
SimpleAttributeOperand clause = listItem.Tag as SimpleAttributeOperand;
if (clause != null)
{
clauses.Add(clause);
}
}
return(clauses);
}
/// <summary>
/// Create expression from string
/// </summary>
public FilterExpression(string filterStatement)
{
// Parse
var lexer = new FilterLexer(new AntlrInputStream(filterStatement));
lexer.RemoveErrorListeners();
lexer.AddErrorListener(new RaiseException <int>());
var parser = new FilterParser(new CommonTokenStream(lexer));
parser.RemoveErrorListeners();
parser.AddErrorListener(new RaiseException <IToken>());
var context = parser.parse();
// Fill in select and where clause
SelectClause = new SimpleAttributeOperandCollection();
WhereClause = new ContentFilter();
if (context.selectList().STAR() != null)
{
// Select all / default
}
else
{
foreach (var expr in context.selectList().selectexpr())
{
expr.attr_op().GetText();
var nodeId = expr.attr_op().nodeId().STRING_LITERAL().GetText();
var browsePathElems = expr.attr_op().nodeId().browsePathElement();
var attributeId = Enum.Parse <NodeAttribute>(expr.attr_op().attributeId().GetText(), true);
var operand = new SimpleAttributeOperand {
// TypeDefinitionId = expr.attr_op()
// AttributeId = (field.InstanceDeclaration.NodeClass == NodeClass.Object) ? Attributes.NodeId : Attributes.Value,
// BrowsePath = field.InstanceDeclaration.BrowsePath
};
SelectClause.Add(operand);
}
}
Evaluate(context.elem_op());
}
/// <summary>
/// Collects the fields for the instance node.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="nodeId">The node id.</param>
/// <param name="parentPath">The parent path.</param>
/// <param name="eventFields">The event fields.</param>
/// <param name="foundNodes">The table of found nodes.</param>
private void CollectFields(
Session session,
NodeId nodeId,
QualifiedNameCollection parentPath,
SimpleAttributeOperandCollection eventFields,
Dictionary <NodeId, QualifiedNameCollection> foundNodes)
{
// find all of the children of the field.
BrowseDescription nodeToBrowse = new BrowseDescription();
nodeToBrowse.NodeId = nodeId;
nodeToBrowse.BrowseDirection = BrowseDirection.Forward;
nodeToBrowse.ReferenceTypeId = ReferenceTypeIds.Aggregates;
nodeToBrowse.IncludeSubtypes = true;
nodeToBrowse.NodeClassMask = (uint)(NodeClass.Object | NodeClass.Variable);
nodeToBrowse.ResultMask = (uint)BrowseResultMask.All;
ReferenceDescriptionCollection children = FormUtils.Browse(session, nodeToBrowse, false);
if (children == null)
{
return;
}
// process the children.
for (int ii = 0; ii < children.Count; ii++)
{
ReferenceDescription child = children[ii];
if (child.NodeId.IsAbsolute)
{
continue;
}
// construct browse path.
QualifiedNameCollection browsePath = new QualifiedNameCollection(parentPath);
browsePath.Add(child.BrowseName);
// check if the browse path is already in the list.
if (!ContainsPath(eventFields, browsePath))
{
SimpleAttributeOperand field = new SimpleAttributeOperand();
field.TypeDefinitionId = ObjectTypeIds.BaseEventType;
field.BrowsePath = browsePath;
field.AttributeId = (child.NodeClass == NodeClass.Variable)?Attributes.Value:Attributes.NodeId;
eventFields.Add(field);
}
// recusively find all of the children.
NodeId targetId = (NodeId)child.NodeId;
// need to guard against loops.
if (!foundNodes.ContainsKey(targetId))
{
foundNodes.Add(targetId, browsePath);
CollectFields(session, (NodeId)child.NodeId, browsePath, eventFields, foundNodes);
}
}
}
/// <summary>
/// Collects the fields for the instance node.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="nodeId">The node id.</param>
/// <param name="parentPath">The parent path.</param>
/// <param name="fields">The event fields.</param>
/// <param name="fieldNodeIds">The node id for the declaration of the field.</param>
/// <param name="foundNodes">The table of found nodes.</param>
private static void CollectFields(
Session session,
NodeId nodeId,
QualifiedNameCollection parentPath,
SimpleAttributeOperandCollection fields,
List<NodeId> fieldNodeIds,
Dictionary<NodeId, QualifiedNameCollection> foundNodes)
{
// find all of the children of the field.
BrowseDescription nodeToBrowse = new BrowseDescription();
nodeToBrowse.NodeId = nodeId;
nodeToBrowse.BrowseDirection = BrowseDirection.Forward;
nodeToBrowse.ReferenceTypeId = ReferenceTypeIds.Aggregates;
nodeToBrowse.IncludeSubtypes = true;
nodeToBrowse.NodeClassMask = (uint)(NodeClass.Object | NodeClass.Variable);
nodeToBrowse.ResultMask = (uint)BrowseResultMask.All;
ReferenceDescriptionCollection children = ClientUtils.Browse(session, nodeToBrowse, false);
if (children == null)
{
return;
}
// process the children.
for (int ii = 0; ii < children.Count; ii++)
{
ReferenceDescription child = children[ii];
if (child.NodeId.IsAbsolute)
{
continue;
}
// construct browse path.
QualifiedNameCollection browsePath = new QualifiedNameCollection(parentPath);
browsePath.Add(child.BrowseName);
// check if the browse path is already in the list.
int index = ContainsPath(fields, browsePath);
if (index < 0)
{
SimpleAttributeOperand field = new SimpleAttributeOperand();
field.TypeDefinitionId = ObjectTypeIds.BaseEventType;
field.BrowsePath = browsePath;
field.AttributeId = (child.NodeClass == NodeClass.Variable) ? Attributes.Value : Attributes.NodeId;
fields.Add(field);
fieldNodeIds.Add((NodeId)child.NodeId);
}
// recusively find all of the children.
NodeId targetId = (NodeId)child.NodeId;
// need to guard against loops.
if (!foundNodes.ContainsKey(targetId))
{
foundNodes.Add(targetId, browsePath);
CollectFields(session, (NodeId)child.NodeId, browsePath, fields, fieldNodeIds, foundNodes);
}
}
}
/// <summary>
/// Constructs the select clauses for a set of event types.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="eventTypeIds">The event type ids.</param>
/// <returns>The select clauses for all fields discovered.</returns>
/// <remarks>
/// Each event type is an ObjectType in the address space. The fields supported by the
/// server are defined as children of the ObjectType. Many of the fields are manadatory
/// and are defined by the UA information model, however, indiviudual servers many not
/// support all of the optional fields.
///
/// This method browses the type model and
/// </remarks>
public SimpleAttributeOperandCollection ConstructSelectClauses(
Session session,
params NodeId[] eventTypeIds)
{
// browse the type model in the server address space to find the fields available for the event type.
SimpleAttributeOperandCollection selectClauses = new SimpleAttributeOperandCollection();
// must always request the NodeId for the condition instances.
// this can be done by specifying an operand with an empty browse path.
SimpleAttributeOperand operand = new SimpleAttributeOperand();
operand.TypeDefinitionId = ObjectTypeIds.BaseEventType;
operand.AttributeId = Attributes.NodeId;
operand.BrowsePath = new QualifiedNameCollection();
selectClauses.Add(operand);
// add the fields for the selected EventTypes.
if (eventTypeIds != null)
{
for (int ii = 0; ii < eventTypeIds.Length; ii++)
{
CollectFields(session, eventTypeIds[ii], selectClauses);
}
}
// use BaseEventType as the default if no EventTypes specified.
else
{
CollectFields(session, ObjectTypeIds.BaseEventType, selectClauses);
}
return selectClauses;
}
/// <summary>
/// Returns the SelectClauses in the control.
/// </summary>
public SimpleAttributeOperandCollection GetSelectClauses()
{
SimpleAttributeOperandCollection clauses = new SimpleAttributeOperandCollection();
foreach (ListViewItem listItem in ItemsLV.Items)
{
SimpleAttributeOperand clause = listItem.Tag as SimpleAttributeOperand;
if (clause != null)
{
clauses.Add(clause);
}
}
return clauses;
}
