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using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http.Headers;
namespace Rssdp
{
/// <summary>
/// Represents a discovered device, containing basic information about the device and the location of it's full device description document. Also provides convenience methods for retrieving the device description document.
/// </summary>
/// <seealso cref="SsdpDevice"/>
/// <seealso cref="Rssdp.Infrastructure.ISsdpDeviceLocator"/>
public sealed class DiscoveredSsdpDevice
{
#region Fields
private DateTimeOffset _AsAt;
#endregion
#region Public Properties
/// <summary>
/// Sets or returns the type of notification, being either a uuid, device type, service type or upnp:rootdevice.
/// </summary>
public string NotificationType { get; set; }
/// <summary>
/// Sets or returns the universal service name (USN) of the device.
/// </summary>
public string Usn { get; set; }
/// <summary>
/// Sets or returns a URL pointing to the device description document for this device.
/// </summary>
public Uri DescriptionLocation { get; set; }
/// <summary>
/// Sets or returns the length of time this information is valid for (from the <see cref="AsAt"/> time).
/// </summary>
public TimeSpan CacheLifetime { get; set; }
/// <summary>
/// Sets or returns the date and time this information was received.
/// </summary>
public DateTimeOffset AsAt
{
get { return _AsAt; }
set
{
if (_AsAt != value)
{
_AsAt = value;
}
}
}
/// <summary>
/// Returns the headers from the SSDP device response message
/// </summary>
public HttpHeaders ResponseHeaders { get; set; }
#endregion
#region Public Methods
/// <summary>
/// Returns true if this device information has expired, based on the current date/time, and the <see cref="CacheLifetime"/> & <see cref="AsAt"/> properties.
/// </summary>
/// <returns></returns>
public bool IsExpired()
{
return this.CacheLifetime == TimeSpan.Zero || this.AsAt.Add(this.CacheLifetime) <= DateTimeOffset.Now;
}
#endregion
#region Overrides
/// <summary>
/// Returns the device's <see cref="Usn"/> value.
/// </summary>
/// <returns>A string containing the device's universal service name.</returns>
public override string ToString()
{
return this.Usn;
}
#endregion
}
}
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