/// <summary>
/// Returns a value indicating whether the original file is new or has been updated.
/// </summary>
/// <returns>
/// True if the the original file is new or has been updated; otherwise, false.
/// </returns>
internal async Task <bool> IsNewOrUpdatedFileAsync()
{
string path = this.CachedPath;
bool isUpdated = false;
CachedImage cachedImage;
if (this.isRemote)
{
cachedImage = await CacheIndexer.GetValueAsync(path);
if (cachedImage != null)
{
// Can't check the last write time so check to see if the cached image is set to expire
// or if the max age is different.
if (this.IsExpired(cachedImage.CreationTimeUtc))
{
CacheIndexer.Remove(path);
isUpdated = true;
}
}
else
{
// Nothing in the cache so we should return true.
isUpdated = true;
}
}
else
{
// Test now for locally requested files.
cachedImage = await CacheIndexer.GetValueAsync(path);
if (cachedImage != null)
{
FileInfo imageFileInfo = new FileInfo(this.requestPath);
if (imageFileInfo.Exists)
{
// Pull the latest info.
imageFileInfo.Refresh();
// Check to see if the last write time is different of whether the
// cached image is set to expire or if the max age is different.
if (!this.RoughDateTimeCompare(imageFileInfo.LastWriteTimeUtc, cachedImage.LastWriteTimeUtc) ||
this.IsExpired(cachedImage.CreationTimeUtc))
{
CacheIndexer.Remove(path);
isUpdated = true;
}
}
}
else
{
// Nothing in the cache so we should return true.
isUpdated = true;
}
}
return(isUpdated);
}
/// <summary>
/// Gets the <see cref="T:System.DateTime"/> set to the last write time of the file.
/// </summary>
/// <returns>
/// The last write time of the file.
/// </returns>
internal async Task <DateTime> GetLastWriteTimeAsync()
{
DateTime dateTime = DateTime.UtcNow;
CachedImage cachedImage = await CacheIndexer.GetValueAsync(this.CachedPath);
if (cachedImage != null)
{
dateTime = cachedImage.LastWriteTimeUtc;
}
return(dateTime);
}
