// Retrieves all the existing resources for a GDG and puts them in a
// sorted dictionary with the generation numbers as keys.
private SortedDictionary <int, IResource> GetResourcesDictionary(GdgPath path)
{
var result = new SortedDictionary <int, IResource>();
foreach (var resource in GetResources(path))
{
result[GetGenerationNumber(resource)] = resource;
}
return(result);
}
// Retrieves a resource from its GDG path and number
private IResource GetResource(GdgPath path, int currentNumber)
{
var number = currentNumber + path.N;
if (number < 0)
{
number += Max;
}
if (number >= Max)
{
number -= Max;
}
return(GetResource(string.Format("file://{0}G{1:0000}V00{2}", path.FullPath, number, path.Extension ?? "")));
}
private IEnumerable <IResource> GetResourcesToDelete(GdgPath path, GdgOptions options, IEnumerable <IResource> resources)
{
var toDelete = new HashSet <IResource>();
var startingResources = _startingResources[path];
var newResources = resources.Except(startingResources.Values).ToList();
foreach (var resource in newResources)
{
var numberToDelete = GetGenerationNumber(resource) - options.Limit;
if (numberToDelete < 0)
{
numberToDelete += Max;
}
if (startingResources.ContainsKey(numberToDelete))
{
toDelete.Add(startingResources[numberToDelete]);
}
}
return(toDelete);
}
// Gets a resource from a GDG path
private IResource GetGdgResource(GdgPath path)
{
var number = GetGenerationNumber(path.FullPath);
if (number == int.MinValue)
{
var resources = GetResourcesDictionary(path);
number = GetGenerationNumber(resources);
_startingResources[path] = resources;
SaveGenerationNumber(path.FullPath, number);
}
var resource = GetResource(path, number);
if (path.N <= 0 && !resource.Exists())
{
Logger.Warn("GDG resource accessed with negative reference does not exist: {0}({1}){2}",
path.FullPath, path.N, path.Extension);
}
return(resource);
}
// Retrieves existing resources for a GDG path.
private IEnumerable <IResource> GetResources(GdgPath path)
{
return(base.DoGetResources(string.Format("file://{0}G*V*{1}", path.FullPath, (path.Extension ?? ""))));
}
private IEnumerable<IResource> GetResourcesToDelete(GdgPath path, GdgOptions options, IEnumerable<IResource> resources)
{
var toDelete = new HashSet<IResource>();
var startingResources = _startingResources[path];
var newResources = resources.Except(startingResources.Values).ToList();
foreach (var resource in newResources)
{
var numberToDelete = GetGenerationNumber(resource) - options.Limit;
if (numberToDelete < 0)
{
numberToDelete += Max;
}
if (startingResources.ContainsKey(numberToDelete))
{
toDelete.Add(startingResources[numberToDelete]);
}
}
return toDelete;
}
// Retrieves existing resources for a GDG path.
private IEnumerable<IResource> GetResources(GdgPath path)
{
return base.DoGetResources(string.Format("file://{0}G*V*{1}", path.FullPath, (path.Extension ?? "")));
}
// Retrieves all the existing resources for a GDG and puts them in a
// sorted dictionary with the generation numbers as keys.
private SortedDictionary<int, IResource> GetResourcesDictionary(GdgPath path)
{
var result = new SortedDictionary<int, IResource>();
foreach (var resource in GetResources(path))
{
result[GetGenerationNumber(resource)] = resource;
}
return result;
}
// Retrieves a resource from its GDG path and number
private IResource GetResource(GdgPath path, int currentNumber)
{
var number = currentNumber + path.N;
if (number < 0)
{
number += Max;
}
if (number >= Max)
{
number -= Max;
}
return GetResource(string.Format("file://{0}G{1:0000}V00{2}", path.FullPath, number, path.Extension ?? ""));
}
// Gets a resource from a GDG path
private IResource GetGdgResource(GdgPath path)
{
var number = GetGenerationNumber(path.FullPath);
if (number == int.MinValue)
{
var resources = GetResourcesDictionary(path);
number = GetGenerationNumber(resources);
_startingResources[path] = resources;
SaveGenerationNumber(path.FullPath, number);
}
var resource = GetResource(path, number);
if (path.N <= 0 && !resource.Exists())
{
Logger.Warn("GDG resource accessed with negative reference does not exist: {0}({1}){2}",
path.FullPath, path.N, path.Extension);
}
return resource;
}
