/// <summary>
/// <para>Returns the logical union between two <see cref='System.Net.PeerToPeer.PnrpPermission'/> instances.</para>
/// </summary>
public override IPermission Union(IPermission target)
{
// Pattern suggested by Security engine
if (target == null)
{
return(this.Copy());
}
PnrpPermission other = target as PnrpPermission;
if (other == null)
{
throw new ArgumentException(SR.GetString(SR.PnrpPermission_CantUnionWithNonPnrpPermission), "target");
}
return(new PnrpPermission(m_noRestriction || other.m_noRestriction));
}
/// <summary>
/// <para>Compares two <see cref='System.Net.PeerToPeer.PnrpPermission'/> instances.</para>
/// </summary>
public override bool IsSubsetOf(IPermission target)
{
// Pattern suggested by Security engine
if (target == null)
{
return(m_noRestriction == false);
}
PnrpPermission other = target as PnrpPermission;
if (other == null)
{
throw new ArgumentException(SR.GetString(SR.PnrpPermission_TargetNotAPnrpPermission), "target");
}
//Here is the matrix of result based on m_noRestriction for me and she
// me.noRestriction she.noRestriction me.isSubsetOf(she)
// 0 0 1
// 0 1 1
// 1 0 0
// 1 1 1
return(!m_noRestriction || other.m_noRestriction);
}
/// <summary>
/// <para>Returns the logical intersection between two <see cref='System.Net.PeerToPeer.PnrpPermission'/> instances.</para>
/// </summary>
public override IPermission Intersect(IPermission target)
{
// Pattern suggested by Security engine
if (target == null)
{
return(null);
}
PnrpPermission other = target as PnrpPermission;
if (other == null)
{
throw new ArgumentException(SR.GetString(SR.PnrpPermission_CantIntersectWithNonPnrpPermission), "target");
}
// return null if resulting permission is restricted and empty
// Hence, the only way for a bool permission will be.
if (this.m_noRestriction && other.m_noRestriction)
{
return(new PnrpPermission(true));
}
return(null);
}