| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library barback.transform; |
| |
| import 'asset.dart'; |
| import 'asset_set.dart'; |
| import 'base_transform.dart'; |
| import 'transform_node.dart'; |
| |
| /// While a [Transformer] represents a *kind* of transformation, this defines |
| /// one specific usage of it on a set of files. |
| /// |
| /// This ephemeral object exists only during an actual transform application to |
| /// facilitate communication between the [Transformer] and the code hosting |
| /// the transformation. It lets the [Transformer] access inputs and generate |
| /// outputs. |
| class Transform extends BaseTransform { |
| final _outputs = new AssetSet(); |
| |
| Transform._(TransformNode node) |
| : super(node); |
| |
| /// Stores [output] as the output created by this transformation. |
| /// |
| /// A transformation can output as many assets as it wants. |
| void addOutput(Asset output) { |
| // TODO(rnystrom): This should immediately throw if an output with that ID |
| // has already been created by this transformer. |
| _outputs.add(output); |
| } |
| } |
| |
| /// The controller for [Transform]. |
| class TransformController extends BaseTransformController { |
| Transform get transform => super.transform; |
| |
| /// The set of assets that the transformer has emitted. |
| AssetSet get outputs => transform._outputs; |
| |
| TransformController(TransformNode node) |
| : super(new Transform._(node)); |
| } |