/// <summary>
/// Register an AssetImporter object to be used when attempting to load an asset
/// of the given type, or an asset file with one of the given extensions.
/// </summary>
/// <param name="assetImporter"></param>
/// <param name="assetFileExtensions"></param>
public static void RegisterAssetImporter<T>(
AbstractAssetImporter assetImporter, params string[] assetFileExtensions)
{
var assetType = typeof(T);
if (RegisteredAssetImportersByType.ContainsKey(assetType))
{
throw new AssetImporterRegistrationException(
String.Format("An asset importer has already been " +
"associated with the type '{0}'.", assetType));
}
RegisteredAssetImportersByType.Add(assetType, assetImporter);
RegisterAssetImporter(assetImporter, assetFileExtensions);
}
/// <summary>
/// Register an AssetImporter object to b used when attempting to load an asset
/// file with one of the given extensions.
///
/// This is useful if you have multiple different asset importers for the same
/// asset type but different asset file extensions. If two asset importers have
/// the same associated asset type, but different asset file extensions, the
/// AssetLoader will be able to determine the asset importer to use when given a
/// file, but will not be able to distinguish the asset importer to use when
/// given the asset type.
///
/// To further illustrate:
/// <code>
/// AssetLoader.RegisterAssetImporter<Texture2D>(new AssetImporter1(), "doc", "xml");
/// AssetLoader.RegisterAssetImporter(new AssetImporter2(), "docx");
/// </code>
///
/// In the above example, it is assumed that AssetImporter1 and AssetImporter2 both import
/// Texture2D objects. Calling AssetLoader.Load<Texture2D>(fileName) would use AssetImporter1
/// to import the asset, as well as AssetLoader.LoadUsingExtension("something.doc"), but
/// AssetLoader.LoadUsingExtension("something.docx") would use AssetImporter2, and
/// AssetLoader.Load<Texture2D>("something.docx") would *still* attempt to use AssetImporter1,
/// since that's the only asset importer associated with Texture2D.
/// </summary>
/// <param name="assetImporter"></param>
/// <param name="assetFileExtensions"></param>
public static void RegisterAssetImporter(
AbstractAssetImporter assetImporter, params string[] assetFileExtensions)
{
foreach (var ext in assetFileExtensions)
{
var truncated = ext[0] == '.' ? ext.Substring(1) : ext;
if (RegisteredAssetImportersByExtension.ContainsKey(truncated))
{
throw new AssetImporterRegistrationException(
String.Format("An asset importer has already been " +
"associated with the extension '.{0}'", truncated));
}
RegisteredAssetImportersByExtension.Add(truncated, assetImporter);
}
}