Final CL to kill off client/samples .

client/samples/swarm/DataSource.dart

-// Copyright (c) 2011, 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.
-
-/** The top-level collection of all sections for a user. */
-// TODO(jimhug): This is known as UserData in the server model.
-class Sections implements Collection<Section> {
-  final List<Section> _sections;
-
-  Sections(this._sections);
-
-  operator [](int i) => _sections[i];
-
-  int get length() => _sections.length;
-
-  List<String> get sectionTitles() =>
-    CollectionUtils.map(_sections, (s) => s.title);
-
-  void refresh() {
-    // TODO(jimhug): http://b/issue?id=5351067
-  }
-
-  /**
-   * Find the Section object that has a given title.
-   * This is used to integrate well with [ConveyorView].
-   */
-  Section findSection(String name) {
-    return CollectionUtils.find(_sections, (sect) => sect.title == name);
-  }
-
-  // TODO(jimhug): Track down callers!
-  Iterator<Section> iterator() => _sections.iterator();
-
-  // TODO(jimhug): Better support for switching between local dev and server.
-  static bool get runningFromFile() {
-    return window.location.protocol.startsWith('file:');
-  }
-
-  static String get home() {
-    // TODO(jmesserly): window.location.origin not available on Safari 4.
-    // Move this workaround to the DOM code. See bug 5389503.
-    return window.location.protocol + '//' + window.location.host;
-  }
-
-  // This method is exposed for tests.
-  static void initializeFromData(String data, void callback(Sections sects)) {
-    final decoder = new Decoder(data);
-    int nSections = decoder.readInt();
-    final sections = new List<Section>();
-
-    for (int i=0; i < nSections; i++) {
-      sections.add(Section.decode(decoder));
-    }
-    callback(new Sections(sections));
-  }
-
-  static void initializeFromUrl(void callback(Sections sections)) {
-    if (Sections.runningFromFile) {
-      initializeFromData(CannedData.data['user.data'], callback);
-    } else {
-      // TODO(jmesserly): display an error if we fail here! Silent failure bad.
-      new XMLHttpRequest.getTEMPNAME('$home/data/user.data',
-          EventBatch.wrap((request) {
-        // TODO(jimhug): Nice response if get error back from server.
-        // TODO(jimhug): Might be more efficient to parse request in sections.
-        initializeFromData(request.responseText, callback);
-      }));
-    }
-  }
-
-  Section findSectionById(String id) {
-    return CollectionUtils.find(_sections, (section) => section.id == id);
-  }
-
-  /**
-   * Given the name of a section, find its index in the set.
-   */
-  int findSectionIndex(String name) {
-    for (int i = 0; i < _sections.length; i++) {
-      if (name == _sections[i].title) {
-        return i;
-      }
-    }
-    return -1;
-  }
-
-  List<Section> get sections() => _sections;
-
-  // Collection<Section> methods:
-  List map(f(Section element)) {
-    return Collections.map(this, new List(), f);
-  }
-
-  List<Section> filter(bool f(Section element)) {
-    return Collections.filter(this, new List<Section>(), f);
-  }
-  bool every(bool f(Section element)) => Collections.every(this, f);
-  bool some(bool f(Section element)) => Collections.some(this, f);
-  void forEach(void f(Section element)) { Collections.forEach(this, f); }
-
-  // TODO(jmesserly): this should be a property
-  bool isEmpty() => length == 0;
-}
-
-
-/** A collection of data sources representing a page in the UI. */
-class Section {
-  final String id;
-  final String title;
-  ObservableList<Feed> feeds;
-
-  // Public for testing. TODO(jacobr): find a cleaner solution.
-  Section(this.id, this.title, this.feeds);
-
-  void refresh() {
-    for (final feed in feeds) {
-      // TODO(jimhug): http://b/issue?id=5351067
-    }
-  }
-
-  static Section decode(Decoder decoder) {
-    final sectionId = decoder.readString();
-    final sectionTitle = decoder.readString();
-
-    final nSources = decoder.readInt();
-    final feeds = new ObservableList<Feed>();
-    for (int j=0; j < nSources; j++) {
-      feeds.add(Feed.decode(decoder));
-    }
-    return new Section(sectionId, sectionTitle, feeds);
-  }
-
-  Feed findFeed(String id_) {
-    return CollectionUtils.find(feeds, (feed) => feed.id == id_);
-  }
-}
-
-/** Provider of a news feed. */
-class Feed {
-  String id;
-  final String title;
-  final String iconUrl;
-  final String description;
-  ObservableList<Article> articles;
-  ObservableValue<bool> error; // TODO(jimhug): Check if dead code.
-
-  Feed(this.id, this.title, this.iconUrl, [this.description = ''])
-    : articles = new ObservableList<Article>(),
-      error = new ObservableValue<bool>(false);
-
-  static Feed decode(Decoder decoder) {
-    final sourceId = decoder.readString();
-    final sourceTitle = decoder.readString();
-    final sourceIcon = decoder.readString();
-    final feed = new Feed(sourceId, sourceTitle, sourceIcon);
-    final nItems = decoder.readInt();
-
-    for (int i=0; i < nItems; i++) {
-      feed.articles.add(Article.decodeHeader(feed, decoder));
-    }
-    return feed;
-  }
-
-  Article findArticle(String id_) {
-    return CollectionUtils.find(articles, (article) => article.id == id_);
-  }
-
-  void refresh() {}
-}
-
-
-/** A single article or posting to display. */
-class Article {
-  final String id;
-  Date date;
-  final String title;
-  final String author;
-  final bool hasThumbnail;
-  String textBody; // TODO(jimhug): rename to snipppet.
-  final Feed dataSource; // TODO(jimhug): rename to feed.
-  String _htmlBody;
-  String srcUrl;
-  final ObservableValue<bool> unread; // TODO(jimhug): persist to server.
-
-  bool error; // TODO(jimhug): Check if this is dead and remove.
-
-  Article(this.dataSource, this.id, this.date, this.title, this.author,
-      this.srcUrl, this.hasThumbnail, this.textBody,
-      [this._htmlBody = null, bool unread = true, this.error = false])
-    : unread = new ObservableValue<bool>(unread);
-
-  String get htmlBody() {
-    _ensureLoaded();
-    return _htmlBody;
-  }
-
-  String get dataUri() {
-    return Uri.encodeComponent(id).replaceAll(
-          ',', '%2C').replaceAll('%2F', '/');
-  }
-
-  String get thumbUrl() {
-    if (!hasThumbnail) return null;
-
-    var home;
-    if (Sections.runningFromFile) {
-      home = 'http://dart.googleplex.com';
-    } else {
-      home = Sections.home;
-    }
-    // By default images from the real server are cached.
-    // Bump the version flag if you change the thumbnail size, and you want to
-    // get the new images. Our server ignores the query params but it gets
-    // around appengine server side caching and the client side cache.
-    return '$home/data/$dataUri.jpg?v=0';
-  }
-
-  // TODO(jimhug): need to return a lazy Observable<String> and also
-  //   add support for preloading.
-  void _ensureLoaded() {
-    if (_htmlBody !== null) return;
-
-    var name = '$dataUri.html';
-    if (Sections.runningFromFile) {
-      _htmlBody = CannedData.data[name];
-    } else {
-      // TODO(jimhug): Remove this truly evil synchronoush xhr.
-      final req = new XMLHttpRequest();
-      req.open('GET', '${Sections.home}/data/$name', false);
-      req.send();
-      _htmlBody = req.responseText;
-    }
-  }
-
-  static Article decodeHeader(Feed source, Decoder decoder) {
-    final id = decoder.readString();
-    final title = decoder.readString();
-    final srcUrl = decoder.readString();
-    final hasThumbnail = decoder.readBool();
-    final author = decoder.readString();
-    final dateInSeconds = decoder.readInt();
-    final snippet = decoder.readString();
-    final date = new Date.fromEpoch(dateInSeconds*1000, new TimeZone.utc());
-    return new Article(source, id, date, title, author, srcUrl, hasThumbnail,
-        snippet);
-  }
-}