rnystrom@google.com
12b11b4cc0
Previously, it was a mix of both styles. Now it's consistent. :) Review URL: https://codereview.chromium.org//11638010 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@16354 260f80e4-7a28-3924-810f-c04153c831b5
57 lines
1.9 KiB
Dart
57 lines
1.9 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library source_registry;
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import 'source.dart';
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/// A class that keeps track of [Source]s used for installing packages.
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class SourceRegistry {
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final Map<String, Source> _map;
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Source _default;
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/// Creates a new registry with no packages registered.
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SourceRegistry() : _map = <String, Source>{};
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/// Returns the default source, which is used when no source is specified.
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Source get defaultSource => _default;
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/// Sets the default source. This takes a string, which must be the name of a
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/// registered source.
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void setDefault(String name) {
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if (!_map.containsKey(name)) {
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// TODO(nweiz): Real error-handling system
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throw 'Default source $name is not in the registry';
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}
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_default = _map[name];
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}
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/// Registers a new source. This source may not have the same name as a source
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/// that's already been registered.
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void register(Source source) {
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if (_map.containsKey(source.name)) {
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// TODO(nweiz): Real error-handling system
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throw 'Source registry already has a source named ${source.name}';
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}
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_map[source.name] = source;
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}
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/// Returns `true` if there is a source named [name].
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bool contains(String name) => _map.containsKey(name);
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/// Returns the source named [name]. Throws an error if no such source has
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/// been registered. If [name] is null, returns the default source.
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Source operator[](String name) {
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if (name == null) {
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if (defaultSource != null) return defaultSource;
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// TODO(nweiz): Real error-handling system
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throw 'No default source has been registered';
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}
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if (_map.containsKey(name)) return _map[name];
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throw 'No source named $name is registered';
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}
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}
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