/// <summary>
/// Returns a stream backed by the specified package if it exists; otherwise returns null.
/// </summary>
/// <param name="packageId">The ID of the package.</param>
/// <param name="packageVersion">The version of the package.</param>
/// <returns>Stream backed by the specified package if it exists; otherwise null.</returns>
/// <exception cref="ArgumentNullException"><paramref name="packageId"/> is null or contains only whitespace or <paramref name="packageVersion"/> is null.</exception>
public override Stream OpenPackage(string packageId, SemanticVersion packageVersion)
{
if (string.IsNullOrWhiteSpace(packageId))
{
throw new ArgumentNullException("packageId");
}
if (packageVersion == null)
{
throw new ArgumentNullException("packageVersion");
}
InitPackageStore();
_logger.Debug("OpenPackage('" + packageId + "', '" + packageVersion + "') called");
var packagePath = Path.Combine(RootPath, packageId);
if (!_fileSystemOperations.DirectoryExists(packagePath))
{
_logger.Warn("Attempted to open package '" + packageId + "', version '" + packageVersion + "', in folder '" + packagePath + "' but the folder didn't exist");
return(null);
}
var versionPath = Path.Combine(packagePath, packageId + "." + packageVersion + ".nupkg");
if (!_fileSystemOperations.FileExists(versionPath))
{
_logger.Warn("Attempted to open package '" + packageId + "', version '" + packageVersion + "', at path '" + versionPath + "' but it didn't exist");
return(null);
}
try
{
return(_fileSystemOperations.GetFileStream(versionPath, FileMode.Open, FileAccess.Read, FileShare.Read | FileShare.Delete));
}
catch (FileNotFoundException ex)
{
_logger.Error("File not found error looking for package '" + packageId + "', version '" + packageVersion + "'.", ex);
return(null);
}
catch (DirectoryNotFoundException ex)
{
_logger.Error("Directory not found error looking for package '" + packageId + "', version '" + packageVersion + "'.", ex);
return(null);
}
}