protected CollectionEqualityComparerBase([CanBeNull] IEqualityComparer <T> elementEqualityComparer)
{
ElementEqualityComparer = elementEqualityComparer ?? FuncEqualityComparer <T> .Create(AreEqualsFunc, GetHashCodeFunc);
}
private void doStartupCheck()
{
XElement[] elements = new XElement[] { CHDBElement, InWorkElement };
foreach (XElement element in elements)
{
IEnumerable <XElement> queryPathsNeedChecking =
// loop on videos
from vid in element.Descendants("VIDEO")
// where they either have never been seen
where (string)vid.Attribute("Exists") == null
// or the last time they were checked is unknown
|| (string)vid.Attribute("LastChecked") == null
// or the last time they where checked was more than two days agp
|| DateTime.Now.Subtract((DateTime)vid.Attribute("LastChecked")).TotalDays > 2
// get the filename
select vid.Element("Filename");
// Check for their existence.
foreach (var file in queryPathsNeedChecking)
{
if (PlayerHelper.CheckFileExists(file.Value))
{
file.Parent.SetAttributeValue("Exists", true);
file.Parent.SetAttributeValue("LastChecked", DateTime.Now);
Console.WriteLine(file.ToString() + " exists");
}
else
{
file.Parent.Attributes("Exists").Remove();
file.Parent.Attributes("LastChecked").Remove();
Console.WriteLine(file.ToString() + " does not exist");
}
}
}
// sync up tag DB
// using "select new" to only retain tag + value
// so tags will look the same in the union
var TagIEqualityComparer = new FuncEqualityComparer <XElement>(
(x1, x2) =>
{
if (x1 == null)
{
return(x2 == null);
}
if (x2 == null)
{
return(x1 == null);
}
return(x1.Value.Equals(x2.Value));
},
(x) =>
{
if (x == null)
{
return(0);
}
return(x.Value.GetHashCode());
});
var allTags = from tag in CHDBElement.Descendants("Tag") select new XElement(tag.Name, tag.Value);
allTags = allTags.Union(from tag in InWorkElement.Descendants("Tag") select new XElement(tag.Name, tag.Value), TagIEqualityComparer);
var tagsInTagDB = from tag in TagDBElement.Descendants("Tag") select new XElement(tag.Name, tag.Value);
// allTags = allTags.Union(tagsInTagDB); is it worth doing this??
var needToAddTags = allTags.Except(tagsInTagDB, TagIEqualityComparer);
// since at this point we should have parentless tags, and should have only tags not already in tagDB
// ... add them
TagDBElement.Add(needToAddTags);
}
