public IGeneratorPlugin LoadPlugin(PluginDescriptor pluginDescriptor)
{
var generatorPluginAssemblyPath = GetGeneratorPluginAssemblies(pluginDescriptor).FirstOrDefault();
if (generatorPluginAssemblyPath == null)
throw new SpecFlowException(string.Format("Unable to find plugin in the plugin search path: {0}. Please check http://go.specflow.org/doc-plugins for details.", pluginDescriptor.Name));
Assembly pluginAssembly;
try
{
pluginAssembly = Assembly.LoadFrom(generatorPluginAssemblyPath);
}
catch(Exception ex)
{
throw new SpecFlowException(string.Format("Unable to load plugin assembly: {0}. Please check http://go.specflow.org/doc-plugins for details.", generatorPluginAssemblyPath), ex);
}
var pluginAttribute = (GeneratorPluginAttribute)Attribute.GetCustomAttribute(pluginAssembly, typeof(GeneratorPluginAttribute));
if (pluginAttribute == null)
throw new SpecFlowException("Missing [assembly:GeneratorPlugin] attribute in " + generatorPluginAssemblyPath);
if (!typeof(IGeneratorPlugin).IsAssignableFrom((pluginAttribute.PluginType)))
throw new SpecFlowException(string.Format("Invalid plugin attribute in {0}. Plugin type must implement IGeneratorPlugin. Please check http://go.specflow.org/doc-plugins for details.", generatorPluginAssemblyPath));
IGeneratorPlugin plugin;
try
{
plugin = (IGeneratorPlugin)Activator.CreateInstance(pluginAttribute.PluginType);
}
catch (Exception ex)
{
throw new SpecFlowException(string.Format("Invalid plugin in {0}. Plugin must have a default constructor that does not throw exception. Please check http://go.specflow.org/doc-plugins for details.", generatorPluginAssemblyPath), ex);
}
return plugin;
}
public IRuntimePlugin LoadPlugin(PluginDescriptor pluginDescriptor)
{
var assemblyName = string.Format(ASSEMBLY_NAME_PATTERN, pluginDescriptor.Name);
Assembly assembly;
try
{
assembly = Assembly.Load(assemblyName);
}
catch(Exception ex)
{
throw new SpecFlowException(string.Format("Unable to load plugin: {0}. Please check http://go.specflow.org/doc-plugins for details.", pluginDescriptor.Name), ex);
}
var pluginAttribute = (RuntimePluginAttribute)Attribute.GetCustomAttribute(assembly, typeof(RuntimePluginAttribute));
if (pluginAttribute == null)
throw new SpecFlowException(string.Format("Missing [assembly:RuntimePlugin] attribute in {0}. Please check http://go.specflow.org/doc-plugins for details.", assembly.FullName));
if (!typeof(IRuntimePlugin).IsAssignableFrom((pluginAttribute.PluginType)))
throw new SpecFlowException(string.Format("Invalid plugin attribute in {0}. Plugin type must implement IRuntimePlugin. Please check http://go.specflow.org/doc-plugins for details.", assembly.FullName));
IRuntimePlugin plugin;
try
{
plugin = (IRuntimePlugin)Activator.CreateInstance(pluginAttribute.PluginType);
}
catch (Exception ex)
{
throw new SpecFlowException(string.Format("Invalid plugin in {0}. Plugin must have a default constructor that does not throw exception. Please check http://go.specflow.org/doc-plugins for details.", assembly.FullName), ex);
}
return plugin;
}
private IEnumerable<string> GetGeneratorPluginAssemblies(PluginDescriptor pluginDescriptor)
{
foreach (var pluginGeneratorFolder in GetPluginGeneratorFolders(pluginDescriptor))
{
string generatorSpecificAssembly = Path.GetFullPath(Path.Combine(pluginGeneratorFolder, string.Format("{0}.Generator.SpecFlowPlugin.dll", pluginDescriptor.Name)));
if (File.Exists(generatorSpecificAssembly))
yield return generatorSpecificAssembly;
string genericAssembly = Path.GetFullPath(Path.Combine(pluginGeneratorFolder, string.Format("{0}.SpecFlowPlugin.dll", pluginDescriptor.Name)));
if (File.Exists(genericAssembly))
yield return genericAssembly;
}
}
protected virtual IRuntimePlugin LoadPlugin(IRuntimePluginLoader pluginLoader, PluginDescriptor pluginDescriptor)
{
return pluginLoader.LoadPlugin(pluginDescriptor);
}
private static IRuntimePlugin LoadPlugin(IRuntimePluginLoader pluginLoader, PluginDescriptor pluginDescriptor)
{
return pluginLoader.LoadPlugin(pluginDescriptor);
}
private IEnumerable<string> GetPluginGeneratorFolders(PluginDescriptor pluginDescriptor)
{
var pluginGeneratorFolders = (new[] { @"" })
.Concat(GetSpecFlowVersionSpecifiers().Select(v => @"tools\SpecFlowPlugin" + v))
.Concat(new[] { @"tools", @"lib\net45", @"lib\net40", @"lib\net35", @"lib"});
return GetPluginFolders(pluginDescriptor).SelectMany(pluginFolder => pluginGeneratorFolders, Path.Combine);
}
private IEnumerable<string> GetNuGetPluginFolders(PluginDescriptor pluginDescriptor)
{
string nuGetPackagesFolder = GetNuGetPackagesFolder();
return pluginPostfixes
.Select(pluginPostfix => pluginDescriptor.Name + pluginPostfix)
.Select(packageName => GetLatestPackage(nuGetPackagesFolder, packageName))
.Where(pluginFolder => pluginFolder != null);
}
private IEnumerable<string> GetPluginFolders(PluginDescriptor pluginDescriptor)
{
if (pluginDescriptor.Path != null)
{
yield return Path.Combine(projectSettings.ProjectFolder, pluginDescriptor.Path);
yield break;
}
yield return generatorFolder;
foreach (var nuGetPluginFolder in GetNuGetPluginFolders(pluginDescriptor))
yield return nuGetPluginFolder;
}
private static IGeneratorPlugin LoadPlugin(IGeneratorPluginLoader pluginLoader, PluginDescriptor pluginDescriptor)
{
return pluginLoader.LoadPlugin(pluginDescriptor);
}