/// <summary>
/// Loads the configuration from an XML file. Assuming that the file exists.
/// </summary>
/// <typeparam name="T">The config object type.</typeparam>
/// <param name="filename">The name of the configuration file.</param>
/// <param name="migrator">The config migrator object.</param>
/// <returns>The configuration instance.</returns>
private static T LoadConfigAsXml <T>(string filename, IConfigMigrator <T> migrator) where T : VersionedConfig, new()
{
using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read))
{
XmlDocument doc = new XmlDocument();
doc.Load(fs);
uint version = 0;
if (doc.DocumentElement.HasAttribute("version"))
{
version = uint.Parse(doc.DocumentElement.Attributes["version"].Value);
}
fs.Position = 0;
return(migrator.MigrateFromXml(version, fs));
}
}
/// <summary>
/// Loads the configuration from a YAML file. Assuming that the file exists.
/// </summary>
/// <typeparam name="T">The config object type.</typeparam>
/// <param name="filename">The name of the configuration file.</param>
/// <param name="migrator">The config migrator object.</param>
/// <returns>The configuration instance.</returns>
private static T LoadConfigAsYaml <T>(string filename, IConfigMigrator <T> migrator) where T : VersionedConfig, new()
{
using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read))
using (StreamReader sr = new StreamReader(fs))
{
YamlStream doc = new YamlStream();
doc.Load(sr);
var mapping = (YamlMappingNode)doc.Documents[0].RootNode;
uint version = 0;
if (mapping.Children.ContainsKey(new YamlScalarNode("ConfigVersion")))
{
version = uint.Parse(((YamlScalarNode)mapping.Children[new YamlScalarNode("ConfigVersion")]).Value);
}
fs.Position = 0;
return(migrator.MigrateFromYaml(version, fs));
}
}
/// <summary>
/// Loads the configuration from a file. XML and YAML are supported.
/// </summary>
/// <typeparam name="T">The config object type.</typeparam>
/// <param name="filename">The name of the configuration file.</param>
/// <param name="migrator">The config migrator object.</param>
/// <returns>The configuration instance.</returns>
public static T LoadConfig <T>(string filename, IConfigMigrator <T> migrator) where T : VersionedConfig, new()
{
if (File.Exists(filename))
{
switch (Path.GetExtension(filename).ToLower())
{
case ".xml":
return(LoadConfigAsXml <T>(filename, migrator));
case ".yml":
return(LoadConfigAsYaml <T>(filename, migrator));
default:
throw new InvalidOperationException("The given filename is not an XML or YAML file.");
}
}
return(new T());
}
