/// <summary>
/// Pushes a new element onto the stack.
/// </summary>
/// <param name="op">The filter operator.</param>
/// <param name="operands">The operands.</param>
/// <returns></returns>
public ContentFilterElement Push(FilterOperator op, params object[] operands)
{
// check if nothing more to do.
if (operands == null || operands.Length == 0)
{
throw ServiceResultException.Create(StatusCodes.BadInvalidArgument, "ContentFilterElement does not have an operands.");
}
// create the element and set the operator.
ContentFilterElement element = new ContentFilterElement();
element.FilterOperator = op;
for (int ii = 0; ii < operands.Length; ii++)
{
// check if a FilterOperand was provided.
FilterOperand filterOperand = operands[ii] as FilterOperand;
if (filterOperand != null)
{
element.FilterOperands.Add(new ExtensionObject(filterOperand));
continue;
}
// check for reference to another ContentFilterElement.
ContentFilterElement existingElement = operands[ii] as ContentFilterElement;
if (existingElement != null)
{
int index = FindElementIndex(existingElement);
if (index == -1)
{
throw ServiceResultException.Create(StatusCodes.BadInvalidArgument, "ContentFilterElement is not part of the ContentFilter.");
}
ElementOperand operand = new ElementOperand();
operand.Index = (uint)index;
element.FilterOperands.Add(new ExtensionObject(operand));
continue;
}
// assume a literal operand.
LiteralOperand literalOperand = new LiteralOperand();
literalOperand.Value = new Variant(operands[ii]);
element.FilterOperands.Add(new ExtensionObject(literalOperand));
}
// insert the new element at the begining of the list.
m_elements.Insert(0, element);
// re-number ElementOperands since all element were shifted up.
for (int ii = 0; ii < m_elements.Count; ii++)
{
foreach (ExtensionObject extension in m_elements[ii].FilterOperands)
{
if (extension != null)
{
ElementOperand operand = extension.Body as ElementOperand;
if (operand != null)
{
operand.Index++;
}
}
}
}
// return new element.
return element;
}
/// <summary>
/// Pushes a new element onto the stack.
/// </summary>
/// <param name="op">The filter operator.</param>
/// <param name="operands">The operands.</param>
/// <returns></returns>
public ContentFilterElement Push(FilterOperator op, params object[] operands)
{
// check if nothing more to do.
if (operands == null || operands.Length == 0)
{
throw ServiceResultException.Create(StatusCodes.BadInvalidArgument, "ContentFilterElement does not have an operands.");
}
// create the element and set the operator.
ContentFilterElement element = new ContentFilterElement();
element.FilterOperator = op;
for (int ii = 0; ii < operands.Length; ii++)
{
// check if a FilterOperand was provided.
FilterOperand filterOperand = operands[ii] as FilterOperand;
if (filterOperand != null)
{
element.FilterOperands.Add(new ExtensionObject(filterOperand));
continue;
}
// check for reference to another ContentFilterElement.
ContentFilterElement existingElement = operands[ii] as ContentFilterElement;
if (existingElement != null)
{
int index = FindElementIndex(existingElement);
if (index == -1)
{
throw ServiceResultException.Create(StatusCodes.BadInvalidArgument, "ContentFilterElement is not part of the ContentFilter.");
}
ElementOperand operand = new ElementOperand();
operand.Index = (uint)index;
element.FilterOperands.Add(new ExtensionObject(operand));
continue;
}
// assume a literal operand.
LiteralOperand literalOperand = new LiteralOperand();
literalOperand.Value = new Variant(operands[ii]);
element.FilterOperands.Add(new ExtensionObject(literalOperand));
}
// insert the new element at the begining of the list.
m_elements.Insert(0, element);
// re-number ElementOperands since all element were shifted up.
for (int ii = 0; ii < m_elements.Count; ii++)
{
foreach (ExtensionObject extension in m_elements[ii].FilterOperands)
{
if (extension != null)
{
ElementOperand operand = extension.Body as ElementOperand;
if (operand != null)
{
operand.Index++;
}
}
}
}
// return new element.
return(element);
}