private IEnumerable <IEntity> ExecuteImpl(ExecutionOptions options)
{
// determine an optimal search order
var searchOrder = _priorityComparerFactory.Create(Predicate);
var files = EnumeratePaths(options.Progress, options.CancellationToken, searchOrder);
// execute the query
using (var reader = _entityManager.CreateReader())
{
foreach (var file in files)
{
options.Progress.Report(new QueryProgressReport(ReportType.BeginLoading, file.Path));
IEntity entity = null;
if (file.IsFile)
{
entity = LoadEntity(reader, file.Path);
}
else // file is a directory
{
entity = new DirectoryEntity(file.Path);
}
options.Progress.Report(new QueryProgressReport(ReportType.EndLoading, file.Path));
if (entity != null && CompiledPredicate(entity))
{
yield return(entity);
}
}
}
options.Progress.Report(new QueryProgressReport(ReportType.EndExecution, null));
}