Reverting 7623

utils/pub/source_registry.dart

-// Copyright (c) 2012, 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.
-
-/**
- * A class that keeps track of [Source]s used for installing packages.
- */
-class SourceRegistry {
-  final Map<String, Source> _map;
-  Source _default;
-
-  /**
-   * Creates a new registry with no packages registered.
-   */
-  SourceRegistry() : _map = <Source>{};
-
-  /**
-   * Returns the default source, which is used when no source is specified.
-   */
-  Source get defaultSource() => _default;
-
-  /**
-   * Sets the default source. This takes a string, which must be the name of a
-   * registered source.
-   */
-  void setDefault(String name) {
-    if (!_map.containsKey(name)) {
-      // TODO(nweiz): Real error-handling system
-      throw 'Default source $name is not in the registry';
-    }
-
-    _default = _map[name];
-  }
-
-  /**
-   * Registers a new source. This source may not have the same name as a source
-   * that's already been registered.
-   */
-  void register(Source source) {
-    if (_map.containsKey(source.name)) {
-      // TODO(nweiz): Real error-handling system
-      throw 'Source registry already has a source named ${source.name}';
-    }
-
-    _map[source.name] = source;
-  }
-
-  /**
-   * Returns the source named [name]. Throws an error if no such source has been
-   * registered. If [name] is null, returns the default source.
-   */
-  Source operator[](String name) {
-    if (name == null) {
-      if (defaultSource != null) return defaultSource;
-      // TODO(nweiz): Real error-handling system
-      throw 'No default source has been registered';
-    }
-    if (_map.containsKey(name)) return _map[name];
-    throw 'No source named $name is registered';
-  }
-}