public IPackage GetLoadPackage(PackageName name)
{
if (Packages.ContainsKey(name))
return Packages[name];
var package = packageLoader.LoadPackage(name);
Packages.Add(name, package);
return package;
}
public IPackage LoadPackage(PackageName packageName)
{
PackageName availablePackageName;
if(!TryGetPackageName(packageName, out availablePackageName))
throw new Exception("Package "+ packageName +" unavailable.");
var packageFile = availablePackageName + PackageExtension;
var packagePath = Path.Combine(PackageFolder, packageFile);
using (var zip = ZipFile.Read(packagePath))
{
var packageDllEntry = zip[packageName.Id+".dll"];
var packageAssembly = ExtractAssembly(packageDllEntry);
return LoadPackageAssembly(packageAssembly);
}
}
//Gets the most recent compatible PackageName available.
private bool TryGetPackageName(PackageName packageName, out PackageName packageNameFound)
{
var wasNameFound = false;
var bestVersion = packageName.Version;
packageNameFound = default (PackageName);
foreach (var name in availablePackages)
{
if (name.Id != packageName.Id)
continue;
if (name.Version.Major != bestVersion.Major)
continue;
if (name.Version.Minor < bestVersion.Minor)
continue;
if (name.Version.Patch < bestVersion.Patch)
continue;
wasNameFound = true;
bestVersion = name.Version;
packageNameFound = name;
}
return wasNameFound;
}
private void Init()
{
var filePaths = Directory.EnumerateFiles(PackageFolder);
foreach (var filePath in filePaths)
{
if (!filePath.EndsWith(PackageExtension))
return;
var fileName = Path.GetFileNameWithoutExtension(filePath);
var packageName = new PackageName(fileName);
availablePackages.Add(packageName);
}
}