public LevelMetadata FindLastLink()
{
LevelMetadata lastLink = this;
LevelMetadata nextLink = this;
while (nextLink != null)
{
lastLink = nextLink;
nextLink = nextLink.NextLink();
}
return(lastLink);
}
//works on any link in the chain
public int CalculateTotalLinkLength()
{
LevelMetadata firstLink = FindFirstLink();
int linkLength = 1;
while (null != firstLink && firstLink.LinkedToLevel != null)
{
firstLink = firstLink.NextLink();
linkLength++;
}
return(linkLength);
}
public bool FindBrokenLink(ref LevelMetadata brokenLevel, ref bool forwardLink)
{
//initialize the out params - assume no broken link
brokenLevel = null;
forwardLink = false;
//First, walk backwards to the first link
LevelMetadata currentLink = this;
LevelMetadata previousLink = null;
LevelMetadata nextLink = null;
while (currentLink.LinkedFromLevel != null)
{
//check to make sure the xml exists
previousLink = currentLink.PreviousLink();
if (null == previousLink)
{
brokenLevel = currentLink;
forwardLink = false; //broke walking backwards
return(true);
}
currentLink = previousLink;
}
//first link now points to the beginning, walk forward to the end, ensuring we
while (currentLink.LinkedToLevel != null)
{
//check to make sure the xml exists
nextLink = currentLink.NextLink();
if (null == nextLink)
{
brokenLevel = currentLink;
forwardLink = false; //broke walking backwards
return(true);
}
currentLink = nextLink;
}
//if we made it this far, all of the links worked out
return(false);
}
