/// <summary>
/// Iterates through IDs of attachments that match the given <paramref name="readTime"/> and <paramref name="saveTime"/> criteria.
/// </summary>
public IEnumerable <string> Query(TimeRange readTime = null, TimeRange saveTime = null)
{
var metadataFilePaths = Directory.EnumerateFiles(_directoryPath, $"*.{MetadataFileExtension}");
foreach (var metadataFilePath in metadataFilePaths)
{
string id;
try
{
var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(metadataFilePath);
id = fileNameWithoutExtension.Substring(FilePrefix.Length);
var metadata = InnerReadMetadata(id, metadataFilePath, GetFilePath(id, DataFileExtension));
if (!DataBusStorageQuery.IsSatisfied(metadata, readTime, saveTime))
{
continue;
}
}
catch (Exception)
{
id = null;
}
if (id != null)
{
yield return(id);
}
}
}
public IEnumerable <string> Query(TimeRange readTime = null, TimeRange saveTime = null)
{
return(_dataStore
.AttachmentIds
.Where(id =>
{
var metadata = _dataStore.LoadMetadata(id);
return DataBusStorageQuery.IsSatisfied(metadata, readTime, saveTime);
}));
}