protected Proxies.Event.FilterType CreateSubscriptionFilter(IEnumerable <TopicInfo> topicInfos)
{
Proxies.Event.FilterType filter = new Proxies.Event.FilterType();
XmlDocument filterDoc = new XmlDocument();
XmlElement filterTopicElement = filterDoc.CreateTopicElement();
string topicPath = string.Empty;
foreach (TopicInfo topicInfo in topicInfos)
{
string topicExpression = TopicInfo.CreateTopicPath(filterTopicElement, topicInfo);
if (string.IsNullOrEmpty(topicPath))
{
topicPath = topicExpression;
}
else
{
topicPath = string.Format("{0}|{1}", topicPath, topicExpression);
}
}
filterTopicElement.InnerText = topicPath;
filter.Any = new XmlElement[] { filterTopicElement };
return(filter);
}
void SubscribeToBegin(SubscriptionHandler Handler)
{
FilterType Filter = new FilterType();
XmlDocument filterDoc = new XmlDocument();
XmlElement filterTopicElement = filterDoc.CreateTopicElement();
// result is not used, but filterTopicElement is updating its namespaces
string topicPath = TopicInfo.CreateTopicPath(filterTopicElement, BeginTopic);
filterTopicElement.InnerText = BeginPath;
Filter.Any = new XmlElement[] { filterTopicElement };
Handler.Subscribe(Filter, -1);
}
/// <summary>
/// Gets invalid MessageContentFilter for element passed.
/// </summary>
/// <param name="element"></param>
/// <param name="manager"></param>
/// <returns></returns>
private FilterInfo GetInvalidMessageContentFilter(XmlElement element, XmlNamespaceManager manager)
{
FilterInfo filter = null;
// if element is a topic
if (element.RepresentsTopic())
{
// Element represents a topic.
// Look for MessageDescription
List <string> itemNames = new List <string>();
XmlElement messageDescription = element.GetMessageDescription();
if (messageDescription != null)
{
CollectItemNames(messageDescription, manager, OnvifMessage.SIMPLEITEMDESCRIPTION, itemNames);
CollectItemNames(messageDescription, manager, OnvifMessage.ELEMENTITEMDESCRIPTION, itemNames);
}
string invalidItemName = itemNames.GetNonMatchingString();
filter = new FilterInfo();
filter.Filter = new FilterType();
XmlDocument doc = new XmlDocument();
XmlElement topicElement = doc.CreateTopicElement();
TopicInfo topicInfo = TopicInfo.ConstructTopicInfo(element);
string topicPath = TopicInfo.CreateTopicPath(topicElement, topicInfo);
topicElement.InnerText = topicPath;
XmlElement contentFilterElement = doc.CreateContentFilterElement();
string simpleItemPrefix = contentFilterElement.GetNamespacePrefix(OnvifMessage.ONVIF);
contentFilterElement.InnerText = string.Format("boolean((//{0}:{1}[@{2}=\"{3}\"] )",
simpleItemPrefix, OnvifMessage.SIMPLEITEM, OnvifMessage.NAME, invalidItemName);
filter.Filter.Any = new XmlElement[] { topicElement, contentFilterElement };
filter.Topic = topicInfo;
filter.MessageDescription = messageDescription;
return(filter);
}
foreach (XmlNode childNode in element.ChildNodes)
{
XmlElement child = childNode as XmlElement;
if (child != null)
{
filter = GetInvalidMessageContentFilter(child, manager);
if (filter != null)
{
return(filter);
}
}
}
// if cannot create filter for any element - return null
return(null);
}
