private static Epub2NcxPageList ReadNavigationPageList(XElement navigationPageListNode)
{
Epub2NcxPageList result = new Epub2NcxPageList();
foreach (XElement pageTargetNode in navigationPageListNode.Elements())
{
if (pageTargetNode.CompareNameTo("pageTarget"))
{
Epub2NcxPageTarget pageTarget = ReadNavigationPageTarget(pageTargetNode);
result.Add(pageTarget);
}
}
return(result);
}
private static Epub2NcxPageTarget ReadNavigationPageTarget(XElement navigationPageTargetNode)
{
Epub2NcxPageTarget result = new Epub2NcxPageTarget();
foreach (XAttribute navigationPageTargetNodeAttribute in navigationPageTargetNode.Attributes())
{
string attributeValue = navigationPageTargetNodeAttribute.Value;
switch (navigationPageTargetNodeAttribute.GetLowerCaseLocalName())
{
case "id":
result.Id = attributeValue;
break;
case "value":
result.Value = attributeValue;
break;
case "type":
Epub2NcxPageTargetType type;
if (Enum.TryParse(attributeValue, true, out type))
{
result.Type = type;
}
else
{
result.Type = Epub2NcxPageTargetType.UNKNOWN;
}
break;
case "class":
result.Class = attributeValue;
break;
case "playorder":
result.PlayOrder = attributeValue;
break;
}
}
if (result.Type == default)
{
throw new Exception("Incorrect EPUB navigation page target: page target type is missing.");
}
result.NavigationLabels = new List <Epub2NcxNavigationLabel>();
foreach (XElement navigationPageTargetChildNode in navigationPageTargetNode.Elements())
{
switch (navigationPageTargetChildNode.GetLowerCaseLocalName())
{
case "navlabel":
Epub2NcxNavigationLabel navigationLabel = ReadNavigationLabel(navigationPageTargetChildNode);
result.NavigationLabels.Add(navigationLabel);
break;
case "content":
Epub2NcxContent content = ReadNavigationContent(navigationPageTargetChildNode);
result.Content = content;
break;
}
}
if (!result.NavigationLabels.Any())
{
throw new Exception("Incorrect EPUB navigation page target: at least one navLabel element is required.");
}
return(result);
}
