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using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
namespace Rssdp
{
/// <summary>
/// Event arguments for the <see cref="Infrastructure.SsdpDeviceLocatorBase.DeviceUnavailable"/> event.
/// </summary>
public sealed class DeviceUnavailableEventArgs : EventArgs
{
#region Fields
private readonly DiscoveredSsdpDevice _DiscoveredDevice;
private readonly bool _Expired;
#endregion
#region Constructors
/// <summary>
/// Full constructor.
/// </summary>
/// <param name="discoveredDevice">A <see cref="DiscoveredSsdpDevice"/> instance representing the device that has become unavailable.</param>
/// <param name="expired">A boolean value indicating whether this device is unavailable because it expired, or because it explicitly sent a byebye notification.. See <see cref="Expired"/> for more detail.</param>
/// <exception cref="ArgumentNullException">Thrown if the <paramref name="discoveredDevice"/> parameter is null.</exception>
public DeviceUnavailableEventArgs(DiscoveredSsdpDevice discoveredDevice, bool expired)
{
if (discoveredDevice == null) throw new ArgumentNullException(nameof(discoveredDevice));
_DiscoveredDevice = discoveredDevice;
_Expired = expired;
}
#endregion
#region Public Properties
/// <summary>
/// Returns true if the device is considered unavailable because it's cached information expired before a new alive notification or search result was received. Returns false if the device is unavailable because it sent an explicit notification of it's unavailability.
/// </summary>
public bool Expired
{
get { return _Expired; }
}
/// <summary>
/// A reference to a <see cref="DiscoveredSsdpDevice"/> instance containing the discovery details of the removed device.
/// </summary>
public DiscoveredSsdpDevice DiscoveredDevice
{
get { return _DiscoveredDevice; }
}
#endregion
}
}
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