public override IPermission Intersect(IPermission target)
{
if (target == null)
{
return(null);
}
XamlLoadPermission permission = CastPermission(target, "target");
if (permission.IsUnrestricted())
{
return(this.Copy());
}
if (this.IsUnrestricted())
{
return(permission.Copy());
}
List <XamlAccessLevel> allowedAccess = new List <XamlAccessLevel>();
foreach (XamlAccessLevel level in this.AllowedAccess)
{
if (permission.Includes(level))
{
allowedAccess.Add(level);
}
else if (level.PrivateAccessToTypeName != null)
{
XamlAccessLevel requestedAccess = level.AssemblyOnly();
if (permission.Includes(requestedAccess))
{
allowedAccess.Add(requestedAccess);
}
}
}
return(new XamlLoadPermission(allowedAccess));
}
public override bool IsSubsetOf(IPermission target)
{
if (target == null)
{
bool isEmpty = !IsUnrestricted() && AllowedAccess.Count == 0;
return(isEmpty);
}
XamlLoadPermission other = CastPermission(target, "target");
if (other.IsUnrestricted())
{
return(true);
}
if (this.IsUnrestricted())
{
return(false);
}
foreach (XamlAccessLevel accessLevel in this.AllowedAccess)
{
if (!other.Includes(accessLevel))
{
return(false);
}
}
return(true);
}
public override IPermission Intersect(IPermission target)
{
if (target == null)
{
return(null);
}
XamlLoadPermission other = CastPermission(target, "target");
if (other.IsUnrestricted())
{
return(this.Copy());
}
if (this.IsUnrestricted())
{
return(other.Copy());
}
List <XamlAccessLevel> result = new List <XamlAccessLevel>();
// We could optimize this with a hash, but we don't expect people to be creating
// large unions of access levels.
foreach (XamlAccessLevel accessLevel in this.AllowedAccess)
{
// First try the full access level
if (other.Includes(accessLevel))
{
result.Add(accessLevel);
}
// Then try the assembly subset
else if (accessLevel.PrivateAccessToTypeName != null)
{
XamlAccessLevel assemblyAccess = accessLevel.AssemblyOnly();
if (other.Includes(assemblyAccess))
{
result.Add(assemblyAccess);
}
}
}
return(new XamlLoadPermission(result));
}
public override bool IsSubsetOf(IPermission target)
{
if (target == null)
{
return(!this.IsUnrestricted() && (this.AllowedAccess.Count == 0));
}
XamlLoadPermission permission = CastPermission(target, "target");
if (!permission.IsUnrestricted())
{
if (this.IsUnrestricted())
{
return(false);
}
foreach (XamlAccessLevel level in this.AllowedAccess)
{
if (!permission.Includes(level))
{
return(false);
}
}
}
return(true);
}
