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async methods added #13

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65 changes: 65 additions & 0 deletions NGeoNames/GeoFileDownloader.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@
using System.Linq;
using System.Net;
using System.Net.Cache;
using System.Threading;
using System.Threading.Tasks;

namespace NGeoNames
{
Expand Down Expand Up @@ -158,6 +160,17 @@ public string[] DownloadFile(string uri, string destinationpath)
return DownloadFile(new Uri(uri, UriKind.RelativeOrAbsolute), destinationpath);
}

/// <summary>
/// Same as DownloadFile but async
/// </summary>
/// <param name="uri"></param>
/// <param name="destinationpath"></param>
/// <returns></returns>
public async Task<string[]> DownloadFileAsync(string uri, string destinationpath)
{
return await DownloadFileAsync(new Uri(uri, UriKind.RelativeOrAbsolute), destinationpath);
}

/// <summary>
/// Downloads the specified file to the destination path using the <see cref="DefaultTTL"/> to determine if an
/// existing version is still valid.
Expand All @@ -179,6 +192,17 @@ public string[] DownloadFile(Uri uri, string destinationpath)
return DownloadFileWhenOlderThan(uri, destinationpath, DefaultTTL);
}

/// <summary>
/// Same as DownloadFile but async
/// </summary>
/// <param name="uri"></param>
/// <param name="destinationpath"></param>
/// <returns></returns>
public async Task<string[]> DownloadFileAsync(Uri uri, string destinationpath)
{
return await DownloadFileWhenOlderThanAsync(uri, destinationpath, DefaultTTL);
}

/// <summary>
/// Downloads the specified file to the destination path using the specified TTL.
/// </summary>
Expand All @@ -204,6 +228,18 @@ public string[] DownloadFileWhenOlderThan(string uri, string destinationpath, Ti
return DownloadFileWhenOlderThan(new Uri(uri, UriKind.RelativeOrAbsolute), destinationpath, ttl);
}

/// <summary>
/// Same as DownloadFileWhenOlderThan but async
/// </summary>
/// <param name="uri"></param>
/// <param name="destinationpath"></param>
/// <param name="ttl"></param>
/// <returns></returns>
public async Task<string[]> DownloadFileWhenOlderThanAsync(string uri, string destinationpath, TimeSpan ttl)
{
return await DownloadFileWhenOlderThanAsync(new Uri(uri, UriKind.RelativeOrAbsolute), destinationpath, ttl);
}

/// <summary>
/// Downloads the specified file to the destination path using the specified TTL.
/// </summary>
Expand Down Expand Up @@ -246,6 +282,35 @@ public string[] DownloadFileWhenOlderThan(Uri uri, string destinationpath, TimeS
return new[] { destinationpath };
}

/// <summary>
/// Same as DownloadFileWhenOlderThan but async
/// </summary>
/// <param name="uri"></param>
/// <param name="destinationpath"></param>
/// <param name="ttl"></param>
/// <returns></returns>
public async Task<string[]> DownloadFileWhenOlderThanAsync(Uri uri, string destinationpath, TimeSpan ttl)
{
var downloaduri = DetermineDownloadPath(uri);
destinationpath = DetermineDestinationPath(downloaduri, destinationpath);

if (IsFileExpired(destinationpath, ttl))
{
using (var w = new WebClient())
{
w.CachePolicy = CachePolicy;
w.Credentials = Credentials;
w.Proxy = Proxy;
w.Headers.Add(HttpRequestHeader.UserAgent, USERAGENT);
await w.DownloadFileTaskAsync(downloaduri, destinationpath);
}
}

if (Path.GetExtension(destinationpath).Equals(".zip", StringComparison.OrdinalIgnoreCase))
return UnzipFiles(destinationpath, ttl);
return new[] { destinationpath };
}

/// <summary>
/// Determines if a file is 'expired' by it's TTL.
/// </summary>
Expand Down