/// <summary>
/// Returns the where clause defined by the filter declaration.
/// </summary>
public ContentFilter GetWhereClause()
{
ContentFilter whereClause = new ContentFilter();
ContentFilterElement element1 = whereClause.Push(FilterOperator.OfType, EventTypeId);
EventFilter filter = new EventFilter();
foreach (FilterDeclarationField field in Fields)
{
if (field.FilterEnabled)
{
SimpleAttributeOperand operand1 = new SimpleAttributeOperand();
operand1.TypeDefinitionId = field.InstanceDeclaration.RootTypeId;
operand1.AttributeId = (field.InstanceDeclaration.NodeClass == NodeClass.Object) ? Attributes.NodeId : Attributes.Value;
operand1.BrowsePath = field.InstanceDeclaration.BrowsePath;
LiteralOperand operand2 = new LiteralOperand();
operand2.Value = field.FilterValue;
ContentFilterElement element2 = whereClause.Push(field.FilterOperator, operand1, operand2);
element1 = whereClause.Push(FilterOperator.And, element1, element2);
}
}
return(whereClause);
}
/// <summary>
/// Returns the subscription filter to use.
/// </summary>
public EventFilter GetFilter()
{
ContentFilter whereClause = new ContentFilter();
ContentFilterElement element1 = whereClause.Push(FilterOperator.OfType, EventTypeId);
EventFilter filter = new EventFilter();
for (int ii = 0; ii < Fields.Count; ii++)
{
filter.SelectClauses.Add(Fields[ii].Operand);
if (Fields[ii].FilterValue != Variant.Null)
{
LiteralOperand operand = new LiteralOperand();
operand.Value = Fields[ii].FilterValue;
ContentFilterElement element2 = whereClause.Push(Fields[ii].FilterOperator, Fields[ii].Operand, operand);
element1 = whereClause.Push(FilterOperator.And, element1, element2);
}
}
filter.WhereClause = whereClause;
return(filter);
}
private void CreateElementNotMI_Click(object sender, EventArgs e)
{
try {
if (ItemsLV.SelectedItems.Count != 1)
{
return;
}
ContentFilterElement element1 = ItemsLV.SelectedItems[0].Tag as ContentFilterElement;
ContentFilter filter = GetFilter();
filter.Push(FilterOperator.Not, element1);
Update(filter);
} catch (Exception exception) {
GuiUtils.HandleException(this.Text, MethodBase.GetCurrentMethod(), exception);
}
}
/// <summary>
/// Constructs the event filter for the subscription.
/// </summary>
/// <returns>The event filter.</returns>
public EventFilter ConstructFilter(Session session)
{
EventFilter filter = new EventFilter();
// the select clauses specify the values returned with each event notification.
filter.SelectClauses = SelectClauses;
// the where clause restricts the events returned by the server.
// it works a lot like the WHERE clause in a SQL statement and supports
// arbitrary expession trees where the operands are literals or event fields.
ContentFilter whereClause = new ContentFilter();
// the code below constructs a filter that looks like this:
// (Severity >= X OR LastSeverity >= X) AND (SuppressedOrShelved == False) AND (OfType(A) OR OfType(B))
// add the severity.
ContentFilterElement element1 = null;
ContentFilterElement element2 = null;
if (Severity > EventSeverity.Min)
{
// select the Severity property of the event.
SimpleAttributeOperand operand1 = new SimpleAttributeOperand();
operand1.TypeDefinitionId = ObjectTypeIds.BaseEventType;
operand1.BrowsePath.Add(BrowseNames.Severity);
operand1.AttributeId = Attributes.Value;
// specify the value to compare the Severity property with.
LiteralOperand operand2 = new LiteralOperand();
operand2.Value = new Variant((ushort)Severity);
// specify that the Severity property must be GreaterThanOrEqual the value specified.
element1 = whereClause.Push(FilterOperator.GreaterThanOrEqual, operand1, operand2);
}
// add the event types.
if (EventTypes != null && EventTypes.Count > 0)
{
element2 = null;
// save the last element.
for (int ii = 0; ii < EventTypes.Count; ii++)
{
// for this example uses the 'OfType' operator to limit events to thoses with specified event type.
LiteralOperand operand1 = new LiteralOperand();
operand1.Value = new Variant(EventTypes[ii]);
ContentFilterElement element3 = whereClause.Push(FilterOperator.OfType, operand1);
// need to chain multiple types together with an OR clause.
if (element2 != null)
{
element2 = whereClause.Push(FilterOperator.Or, element2, element3);
}
else
{
element2 = element3;
}
}
// need to link the set of event types with the previous filters.
if (element1 != null)
{
whereClause.Push(FilterOperator.And, element1, element2);
}
}
filter.WhereClause = whereClause;
// return filter.
return(filter);
}
private void SelectNodeMI_Click(object sender, EventArgs e)
{
try
{
ReferenceDescription reference = new SelectNodeDlg().ShowDialog(m_browser, ObjectTypes.BaseEventType);
if (reference != null)
{
Node node = m_session.NodeCache.Find(reference.NodeId) as Node;
if (node == null)
{
return;
}
ContentFilterElement element = null;
// build the relative path.
QualifiedNameCollection browsePath = new QualifiedNameCollection();
NodeId typeId = m_session.NodeCache.BuildBrowsePath(node, browsePath);
switch (node.NodeClass)
{
case NodeClass.Variable:
{
IVariable variable = node as IVariable;
if (variable == null)
{
break;
}
// create attribute operand.
SimpleAttributeOperand attribute = new SimpleAttributeOperand(
m_session.FilterContext,
typeId,
browsePath);
// create default value.
object value = GuiUtils.GetDefaultValue(variable.DataType, variable.ValueRank);
// create attribute filter.
element = m_filter.Push(FilterOperator.Equals, attribute, value);
break;
}
case NodeClass.Object:
{
// create attribute operand.
SimpleAttributeOperand attribute = new SimpleAttributeOperand(
m_session.FilterContext,
typeId,
browsePath);
attribute.AttributeId = Attributes.NodeId;
// create attribute filter.
element = m_filter.Push(FilterOperator.IsNull, attribute);
break;
}
case NodeClass.ObjectType:
{
element = m_filter.Push(FilterOperator.OfType, node.NodeId);
break;
}
default:
{
throw new ArgumentException("Selected an invalid node.");
}
}
// add element.
if (element != null)
{
AddItem(element);
AdjustColumns();
}
}
}
catch (Exception exception)
{
GuiUtils.HandleException(this.Text, MethodBase.GetCurrentMethod(), exception);
}
}
/// <summary>
/// Returns the where clause defined by the filter declaration.
/// </summary>
private ContentFilter GetWhereClause()
{
ContentFilter whereClause = new ContentFilter();
ContentFilterElement element1 = null;
// filter by source.
if (SelectedSources != null && SelectedSources.Count > 0)
{
SimpleAttributeOperand operand1 = new SimpleAttributeOperand();
operand1.TypeDefinitionId = Opc.Ua.ObjectTypeIds.BaseEventType;
operand1.AttributeId = Attributes.Value;
operand1.BrowsePath.Add(new QualifiedName(Opc.Ua.BrowseNames.SourceNode));
for (int ii = 0; ii < SelectedSources.Count; ii++)
{
LiteralOperand operand2 = new LiteralOperand();
operand2.Value = SelectedSources[ii];
ContentFilterElement element2 = whereClause.Push(FilterOperator.Equals, operand1, operand2);
element1 = (element1 != null)?whereClause.Push(FilterOperator.Or, element1, element2):element2;
}
}
// add condition/tracking categories if no other categories selected.
if (RevisedCategories == null || RevisedCategories.Count == 0)
{
if (EventTypes == (OpcRcw.Ae.Constants.SIMPLE_EVENT | OpcRcw.Ae.Constants.TRACKING_EVENT))
{
ContentFilterElement element2 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.ConditionType);
ContentFilterElement element3 = whereClause.Push(FilterOperator.Not, element2);
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element3) : element3;
}
else if (EventTypes == (OpcRcw.Ae.Constants.SIMPLE_EVENT | OpcRcw.Ae.Constants.CONDITION_EVENT))
{
ContentFilterElement element2 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.AuditEventType);
ContentFilterElement element3 = whereClause.Push(FilterOperator.Not, element2);
ContentFilterElement element4 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.TransitionEventType);
ContentFilterElement element5 = whereClause.Push(FilterOperator.Not, element4);
ContentFilterElement element6 = whereClause.Push(FilterOperator.Or, element3, element5);
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element6) : element6;
}
else if (EventTypes == (OpcRcw.Ae.Constants.TRACKING_EVENT | OpcRcw.Ae.Constants.CONDITION_EVENT))
{
ContentFilterElement element2 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.AuditEventType);
ContentFilterElement element3 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.TransitionEventType);
ContentFilterElement element4 = whereClause.Push(FilterOperator.Or, element2, element3);
ContentFilterElement element5 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.ConditionType);
ContentFilterElement element6 = whereClause.Push(FilterOperator.Or, element4, element5);
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element6) : element6;
}
else if (EventTypes == OpcRcw.Ae.Constants.TRACKING_EVENT)
{
ContentFilterElement element2 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.AuditEventType);
ContentFilterElement element3 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.TransitionEventType);
ContentFilterElement element4 = whereClause.Push(FilterOperator.Or, element2, element3);
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element4) : element4;
}
else if (EventTypes == OpcRcw.Ae.Constants.CONDITION_EVENT)
{
ContentFilterElement element2 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.ConditionType);
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element2) : element2;
}
else if (EventTypes == OpcRcw.Ae.Constants.SIMPLE_EVENT)
{
ContentFilterElement element2 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.AuditEventType);
ContentFilterElement element3 = whereClause.Push(FilterOperator.Not, element2);
ContentFilterElement element4 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.TransitionEventType);
ContentFilterElement element5 = whereClause.Push(FilterOperator.Not, element4);
ContentFilterElement element6 = whereClause.Push(FilterOperator.Or, element3, element5);
ContentFilterElement element7 = whereClause.Push(FilterOperator.OfType, Opc.Ua.ObjectTypeIds.ConditionType);
ContentFilterElement element8 = whereClause.Push(FilterOperator.Not, element7);
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element8) : element8;
}
}
// filter by event type.
if (RevisedCategories.Count > 0)
{
SimpleAttributeOperand operand1 = new SimpleAttributeOperand();
operand1.TypeDefinitionId = Opc.Ua.ObjectTypeIds.BaseEventType;
operand1.AttributeId = Attributes.Value;
operand1.BrowsePath.Add(new QualifiedName(Opc.Ua.BrowseNames.EventType));
ContentFilterElement element3 = null;
for (int ii = 0; ii < RevisedCategories.Count; ii++)
{
ContentFilterElement element2 = whereClause.Push(FilterOperator.Equals, operand1, RevisedCategories[ii].TypeId);
element3 = (element3 != null) ? whereClause.Push(FilterOperator.Or, element2, element3) : element2;
}
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element3) : element3;
}
// filter by severity.
if (LowSeverity > 1 || HighSeverity < 1000)
{
SimpleAttributeOperand operand1 = new SimpleAttributeOperand();
operand1.TypeDefinitionId = Opc.Ua.ObjectTypeIds.BaseEventType;
operand1.AttributeId = Attributes.Value;
operand1.BrowsePath.Add(new QualifiedName(Opc.Ua.BrowseNames.Severity));
if (LowSeverity > 1)
{
LiteralOperand operand2 = new LiteralOperand();
operand2.Value = LowSeverity;
ContentFilterElement element2 = whereClause.Push(FilterOperator.GreaterThanOrEqual, operand1, operand2);
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element2) : element2;
}
if (HighSeverity < 1000)
{
LiteralOperand operand2 = new LiteralOperand();
operand2.Value = HighSeverity;
ContentFilterElement element2 = whereClause.Push(FilterOperator.LessThanOrEqual, operand1, operand2);
element1 = (element1 != null) ? whereClause.Push(FilterOperator.And, element1, element2) : element2;
}
}
return(whereClause);
}