/// <summary>Estimate viability of operation.</summary>
/// <exception cref="FileNotFoundException">If <see cref="SrcPath"/> is not found.</exception>
/// <exception cref="FileSystemExceptionFileExists">If <see cref="Path"/> already exists.</exception>
protected override void InnerEstimate()
{
PathConverter pathConverter = new PathConverter(SrcPath, Path);
List <IEntry> queue = new List <IEntry>();
// Src
IEntry e = SrcFileSystem.GetEntry(SrcPath, srcOption.OptionIntersection(session.Option));
// Src not found
if (e == null)
{
// Throw
if (EffectivePolicy.HasFlag(OperationPolicy.SrcThrow))
{
throw new FileNotFoundException(SrcPath);
}
// Skip
if (EffectivePolicy.HasFlag(OperationPolicy.SrcSkip))
{
SetState(OperationState.Skipped); return;
}
// Fail anyway
throw new FileNotFoundException(SrcPath);
}
queue.Add(e);
while (queue.Count > 0)
{
try
{
// Next entry
int lastIx = queue.Count - 1;
IEntry entry = queue[lastIx];
queue.RemoveAt(lastIx);
// Omit package mounts
if (session.Policy.HasFlag(OperationPolicy.OmitMountedPackages) && entry.IsPackageMount())
{
continue;
}
// Process directory
if (entry.IsDirectory())
{
// Browse children
IDirectoryContent content = SrcFileSystem.Browse(entry.Path, srcOption.OptionIntersection(session.Option));
// Assert children don't refer to the parent of the parent
foreach (IEntry child in content)
{
if (entry.Path.StartsWith(child.Path))
{
throw new IOException($"{child.Path} cannot be child of {entry.Path}");
}
}
// Visit child
for (int i = content.Count - 1; i >= 0; i--)
{
queue.Add(content[i]);
}
// Convert path
string _dstPath;
if (!pathConverter.ParentToChild(entry.Path, out _dstPath))
{
throw new Exception("Failed to convert path");
}
// Add op
if (_dstPath != "")
{
Ops.Add(new CreateDirectory(session, FileSystem, _dstPath, Option.OptionIntersection(session.Option), OpPolicy));
}
}
// Process file
else if (entry.IsFile())
{
// Convert path
string _dstPath;
if (!pathConverter.ParentToChild(entry.Path, out _dstPath))
{
throw new Exception("Failed to convert path");
}
// Add op
Ops.Add(new CopyFile(session, SrcFileSystem, entry.Path, FileSystem, _dstPath, srcOption.OptionIntersection(session.Option), Option.OptionIntersection(session.Option), OpPolicy));
}
}
catch (Exception error) when(SetError(error))
{
}
}
base.InnerEstimate();
}