// Copyright (c) 2015, 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.

/// Null pattern implementation of the [CompilerOutput] interface.

library compiler.null_api;

import '../compiler_new.dart';
import 'dart:async';

/// Null pattern implementation of the [CompilerOutput] interface.
class NullCompilerOutput implements CompilerOutput {
  const NullCompilerOutput();

  @override
  EventSink<String> createEventSink(String name, String extension) {
    return NullSink.outputProvider(name, extension);
  }
}

/// A sink that drains into /dev/null.
class NullSink implements EventSink<String> {
  final String name;

  NullSink(this.name);

  add(String value) {}

  void addError(Object error, [StackTrace stackTrace]) {}

  void close() {}

  toString() => name;

  /// Convenience method for getting an [api.CompilerOutputProvider].
  static NullSink outputProvider(String name, String extension) {
    return new NullSink('$name.$extension');
  }
}