private static Epub2NcxNavigationTarget ReadNavigationTarget(XElement navigationTargetNode)
{
Epub2NcxNavigationTarget result = new Epub2NcxNavigationTarget();
foreach (XAttribute navigationPageTargetNodeAttribute in navigationTargetNode.Attributes())
{
string attributeValue = navigationPageTargetNodeAttribute.Value;
switch (navigationPageTargetNodeAttribute.GetLowerCaseLocalName())
{
case "id":
result.Id = attributeValue;
break;
case "value":
result.Value = attributeValue;
break;
case "class":
result.Class = attributeValue;
break;
case "playorder":
result.PlayOrder = attributeValue;
break;
}
}
if (String.IsNullOrWhiteSpace(result.Id))
{
throw new Exception("Incorrect EPUB navigation target: navigation target ID is missing.");
}
foreach (XElement navigationTargetChildNode in navigationTargetNode.Elements())
{
switch (navigationTargetChildNode.GetLowerCaseLocalName())
{
case "navlabel":
Epub2NcxNavigationLabel navigationLabel = ReadNavigationLabel(navigationTargetChildNode);
result.NavigationLabels.Add(navigationLabel);
break;
case "content":
Epub2NcxContent content = ReadNavigationContent(navigationTargetChildNode);
result.Content = content;
break;
}
}
if (!result.NavigationLabels.Any())
{
throw new Exception("Incorrect EPUB navigation target: at least one navLabel element is required.");
}
return(result);
}
private static Epub2NcxNavigationList ReadNavigationList(XElement navigationListNode)
{
Epub2NcxNavigationList result = new Epub2NcxNavigationList();
foreach (XAttribute navigationListNodeAttribute in navigationListNode.Attributes())
{
string attributeValue = navigationListNodeAttribute.Value;
switch (navigationListNodeAttribute.GetLowerCaseLocalName())
{
case "id":
result.Id = attributeValue;
break;
case "class":
result.Class = attributeValue;
break;
}
}
foreach (XElement navigationListChildNode in navigationListNode.Elements())
{
switch (navigationListChildNode.GetLowerCaseLocalName())
{
case "navlabel":
Epub2NcxNavigationLabel navigationLabel = ReadNavigationLabel(navigationListChildNode);
result.NavigationLabels.Add(navigationLabel);
break;
case "navTarget":
Epub2NcxNavigationTarget navigationTarget = ReadNavigationTarget(navigationListChildNode);
result.NavigationTargets.Add(navigationTarget);
break;
}
}
if (!result.NavigationLabels.Any())
{
throw new Exception("Incorrect EPUB navigation page target: at least one navLabel element is required.");
}
return(result);
}
