public override IPermission Union(IPermission other)
{
EnvironmentPermission ep = Cast(other);
if (ep == null)
{
return(Copy());
}
if (IsUnrestricted() || ep.IsUnrestricted())
{
return(new EnvironmentPermission(PermissionState.Unrestricted));
}
if (IsEmpty() && ep.IsEmpty())
{
return(null);
}
EnvironmentPermission result = (EnvironmentPermission)Copy();
string path = ep.GetPathList(EnvironmentPermissionAccess.Read);
if (path != null)
{
result.AddPathList(EnvironmentPermissionAccess.Read, path);
}
path = ep.GetPathList(EnvironmentPermissionAccess.Write);
if (path != null)
{
result.AddPathList(EnvironmentPermissionAccess.Write, path);
}
return(result);
}
public override IPermission Intersect(IPermission target)
{
EnvironmentPermission ep = Cast(target);
if (ep == null)
{
return(null);
}
if (IsUnrestricted())
{
return(ep.Copy());
}
if (ep.IsUnrestricted())
{
return(Copy());
}
int n = 0;
EnvironmentPermission result = new EnvironmentPermission(PermissionState.None);
string readTarget = ep.GetPathList(EnvironmentPermissionAccess.Read);
if (readTarget != null)
{
string[] targets = readTarget.Split(';');
foreach (string t in targets)
{
if (readList.Contains(t))
{
result.AddPathList(EnvironmentPermissionAccess.Read, t);
n++;
}
}
}
string writeTarget = ep.GetPathList(EnvironmentPermissionAccess.Write);
if (writeTarget != null)
{
string[] targets = writeTarget.Split(';');
foreach (string t in targets)
{
if (writeList.Contains(t))
{
result.AddPathList(EnvironmentPermissionAccess.Write, t);
n++;
}
}
}
return((n > 0) ? result : null);
}
private EnvironmentPermission Cast(IPermission target)
{
if (target == null)
{
return(null);
}
EnvironmentPermission ep = (target as EnvironmentPermission);
if (ep == null)
{
ThrowInvalidPermission(target, typeof(EnvironmentPermission));
}
return(ep);
}
public override IPermission Copy()
{
EnvironmentPermission ep = new EnvironmentPermission(_state);
string path = GetPathList(EnvironmentPermissionAccess.Read);
if (path != null)
{
ep.SetPathList(EnvironmentPermissionAccess.Read, path);
}
path = GetPathList(EnvironmentPermissionAccess.Write);
if (path != null)
{
ep.SetPathList(EnvironmentPermissionAccess.Write, path);
}
return(ep);
}
public override bool IsSubsetOf(IPermission target)
{
EnvironmentPermission ep = Cast(target);
if (ep == null)
{
return(false);
}
if (IsUnrestricted())
{
return(ep.IsUnrestricted());
}
else if (ep.IsUnrestricted())
{
return(true);
}
foreach (string s in readList)
{
if (!ep.readList.Contains(s))
{
return(false);
}
}
foreach (string s in writeList)
{
if (!ep.writeList.Contains(s))
{
return(false);
}
}
return(true);
}