sdk/tools/dom/templates/html/impl/impl_Storage.darttemplate

// 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.

part of $LIBRARYNAME;

/**
 * The type used by the
 * [Window.localStorage] and [Window.sessionStorage] properties.
 * Storage is implemented as a Map<String, String>.
 *
 * To store and get values, use Dart's built-in map syntax:
 *
 *     window.localStorage['key1'] = 'val1';
 *     window.localStorage['key2'] = 'val2';
 *     window.localStorage['key3'] = 'val3';
 *     assert(window.localStorage['key3'] == 'val3');
 *
 * You can use [Map](http://api.dartlang.org/dart_core/Map.html) APIs
 * such as containsValue(), clear(), and length:
 *
 *     assert(window.localStorage.containsValue('does not exist') == false);
 *     window.localStorage.clear();
 *     assert(window.localStorage.length == 0);
 *
 * For more examples of using this API, see
 * [localstorage_test.dart](http://code.google.com/p/dart/source/browse/branches/bleeding_edge/dart/tests/html/localstorage_test.dart).
 * For details on using the Map API, see the
 * [Maps](http://www.dartlang.org/docs/library-tour/#maps-aka-dictionaries-or-hashes)
 * section of the library tour.
 */
$(ANNOTATIONS)class $CLASSNAME$EXTENDS implements Map<String, String>
    $NATIVESPEC {

  // TODO(nweiz): update this when maps support lazy iteration
  bool containsValue(String value) => values.any((e) => e == value);

  bool containsKey(String key) => $dom_getItem(key) != null;

  String operator [](String key) => $dom_getItem(key);

  void operator []=(String key, String value) { $dom_setItem(key, value); }

  String putIfAbsent(String key, String ifAbsent()) {
    if (!containsKey(key)) this[key] = ifAbsent();
    return this[key];
  }

  String remove(String key) {
    final value = this[key];
    $dom_removeItem(key);
    return value;
  }

  void clear() => $dom_clear();

  void forEach(void f(String key, String value)) {
    for (var i = 0; true; i++) {
      final key = $dom_key(i);
      if (key == null) return;

      f(key, this[key]);
    }
  }

  Collection<String> get keys {
    final keys = [];
    forEach((k, v) => keys.add(k));
    return keys;
  }

  Collection<String> get values {
    final values = [];
    forEach((k, v) => values.add(v));
    return values;
  }

  int get length => $dom_length;

  bool get isEmpty => $dom_key(0) == null;
$!MEMBERS
}