/// <summary>
/// Initializes a new instance of the <see cref="EventFieldDefinition"/> class.
/// </summary>
/// <param name="parentField">The parent field.</param>
/// <param name="reference">The reference to the instance declaration node.</param>
public EventFieldDefinition(EventFieldDefinition parentField, ReferenceDescription reference)
{
DeclarationNode = reference;
Operand = new SimpleAttributeOperand();
// setting the typedefinition id to null ignores the event type when evaluating the operand.
Operand.TypeDefinitionId = null;
// event filters only support the NodeId attribute for objects and the Value attribute for Variables.
Operand.AttributeId = (reference.NodeClass == NodeClass.Variable) ? Attributes.Value : Attributes.NodeId;
// prefix the browse path with the parent browse path.
if (parentField != null)
{
Operand.BrowsePath = new QualifiedNameCollection(parentField.Operand.BrowsePath);
}
// add the child browse name.
Operand.BrowsePath.Add(reference.BrowseName);
// may select sub-sets of array values. Not used in this sample.
Operand.IndexRange = null;
// construct the display name.
StringBuilder buffer = new StringBuilder();
for (int ii = 0; ii < Operand.BrowsePath.Count; ii++)
{
if (buffer.Length > 0)
{
buffer.Append('/');
}
buffer.Append(Operand.BrowsePath[ii].Name);
}
DisplayName = buffer.ToString();
}
/// <summary>
/// Initializes a new instance of the <see cref="EventFieldDefinition"/> class.
/// </summary>
/// <param name="parentField">The parent field.</param>
/// <param name="reference">The reference to the instance declaration node.</param>
public EventFieldDefinition(EventFieldDefinition parentField, ReferenceDescription reference)
{
DeclarationNode = reference;
Operand = new SimpleAttributeOperand();
// setting the typedefinition id to null ignores the event type when evaluating the operand.
Operand.TypeDefinitionId = null;
// event filters only support the NodeId attribute for objects and the Value attribute for Variables.
Operand.AttributeId = (reference.NodeClass == NodeClass.Variable) ? Attributes.Value : Attributes.NodeId;
// prefix the browse path with the parent browse path.
if (parentField != null)
{
Operand.BrowsePath = new QualifiedNameCollection(parentField.Operand.BrowsePath);
}
// add the child browse name.
Operand.BrowsePath.Add(reference.BrowseName);
// may select sub-sets of array values. Not used in this sample.
Operand.IndexRange = null;
// construct the display name.
StringBuilder buffer = new StringBuilder();
for (int ii = 0; ii < Operand.BrowsePath.Count; ii++)
{
if (buffer.Length > 0)
{
buffer.Append('/');
}
buffer.Append(Operand.BrowsePath[ii].Name);
}
DisplayName = buffer.ToString();
}