/// <summary>
/// Reads the next NVG element from the stream.
/// </summary>
/// <returns>The next NVG element or <code>null</code> when there are no more NVG elements.</returns>
public INvgElement ReadNextElement()
{
NvgElementPosition elementPosition = null;
INvgElement element = null;
while (_xmlTextReader.Read())
{
switch (_xmlTextReader.NodeType)
{
case XmlNodeType.Element:
var startTag = new NvgElementTag(_xmlTextReader.LocalName);
if (startTag.IsNvgTag)
{
// Read the NVG element
element = new NvgElement();
element.ConstructFromReader(_xmlTextReader);
elementPosition = CreateElementPosition(element, startTag, elementPosition);
}
else if (startTag.IsGroupTag)
{
// Read the NVG group element
element = new NvgGroupElement();
element.ConstructFromReader(_xmlTextReader);
elementPosition = CreateElementPosition(element, startTag, elementPosition);
}
else if (startTag.IsPointTag)
{
// Read the NVG point element
element = new NvgPointElement();
element.ConstructFromReader(_xmlTextReader);
elementPosition = CreateElementPosition(element, startTag, elementPosition);
}
break;
case XmlNodeType.EndElement:
var endTag = new NvgElementTag(_xmlTextReader.LocalName);
// Add children and reset the position to the matching start tag
elementPosition = AddChildren(elementPosition, endTag);
if (null != elementPosition)
{
// Reset the current element to the start tag
element = elementPosition.Element;
}
if (endTag.IsNvgTag)
{
return(element);
}
break;
}
}
return(null);
}
private static Message CreateMessage(NvgPointElement pointElement)
{
var messageProperties = new Dictionary <string, string>();
messageProperties.Add(@"_type", @"position_report");
messageProperties.Add(@"_action", @"update");
messageProperties.Add(@"_id", pointElement.Id);
messageProperties.Add(@"_control_points", string.Format(CultureInfo.InvariantCulture, @"{0},{1}", pointElement.X, pointElement.Y));
messageProperties.Add(@"_wkid", @"4326");
messageProperties.Add(@"sic", pointElement.SymbolCode);
messageProperties.Add(@"uniquedesignation", pointElement.Label);
return(new Message(messageProperties));
}
private static bool TryProcessMessage(NvgPointElement nvgPointElement, MessageLayer messageLayer)
{
if (null != nvgPointElement)
{
if (!nvgPointElement.IsEmpty)
{
var message = CreateMessage(nvgPointElement);
if (messageLayer.ProcessMessage(message))
{
return(true);
}
}
}
return(false);
}