Create associated packages for the dart:collection and dart:async libs.

pkg/collection_helpers/lib/unmodifiable_wrappers.dart

-// Copyright (c) 2013, 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.
-
-/**
- * Wrappers that prevent a List, Set, or Map object from being modified.
- *
- * The [Set] and [Map] wrappers allow reading from the wrapped collection,
- * but prohibit writing.
- *
- * The [List] wrapper prevents changes to the length of the wrapped list,
- * but allows changes to the contents.
- */
-part of dart.collection_helpers.wrappers;
-
-/**
- * A fixed-length list.
- *
- * A `NonGrowableListView` contains a [List] object and ensures that
- * its length does not change.
- * Methods that would change the length of the list,
- * such as [add] and [remove], throw an [UnsupportedError].
- * All other methods work directly on the underlying list.
- *
- * This class _does_ allow changes to the contents of the wrapped list.
- * You can, for example, [sort] the list.
- * Permitted operations defer to the wrapped list.
- */
-class NonGrowableListView<E> extends DelegatingList<E>
-                             with NonGrowableListMixin<E> {
-  NonGrowableListView(List<E> listBase) : super(listBase);
-}
-
-/**
- * Mixin class that implements a throwing version of all list operations that
- * change the List's length.
- */
-abstract class NonGrowableListMixin<E> implements List<E> {
-  static void _throw() {
-    throw new UnsupportedError(
-        "Cannot change the length of a fixed-length list");
-  }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void set length(int newLength) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  bool add(E value) {
-    _throw();
-  }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void addAll(Iterable<E> iterable) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void insert(int index, E element) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void insertAll(int index, Iterable<E> iterable) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  bool remove(Object value) { _throw(); }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  E removeAt(int index) { _throw(); }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  E removeLast() { _throw(); }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void removeWhere(bool test(E element)) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void retainWhere(bool test(E element)) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void removeRange(int start, int end) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void replaceRange(int start, int end, Iterable<E> iterable) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the length of the list are disallowed.
-   */
-  void clear() => _throw();
-}
-
-/**
- * An unmodifiable set.
- *
- * An UnmodifiableSetView contains a [Set] object and ensures
- * that it does not change.
- * Methods that would change the set,
- * such as [add] and [remove], throw an [UnsupportedError].
- * Permitted operations defer to the wrapped set.
- */
-class UnmodifiableSetView<E> extends DelegatingSet<E>
-                             with UnmodifiableSetMixin<E> {
-  UnmodifiableSetView(Set<E> setBase) : super(setBase);
-}
-
-/**
- * Mixin class that implements a throwing version of all set operations that
- * change the Set.
- */
-abstract class UnmodifiableSetMixin<E> implements Set<E> {
-  void _throw() {
-    throw new UnsupportedError("Cannot modify an unmodifiable Set");
-  }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the set are disallowed.
-   */
-  bool add(E value) {
-    _throw();
-  }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the set are disallowed.
-   */
-  void addAll(Iterable<E> elements) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the set are disallowed.
-   */
-  bool remove(Object value) { _throw(); }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the set are disallowed.
-   */
-  void removeAll(Iterable elements) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the set are disallowed.
-   */
-  void retainAll(Iterable elements) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the set are disallowed.
-   */
-  void removeWhere(bool test(E element)) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the set are disallowed.
-   */
-  void retainWhere(bool test(E element)) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the set are disallowed.
-   */
-  void clear() => _throw();
-}
-
-/**
- * An unmodifiable map.
- *
- * An UnmodifiableMapView contains a [Map] object and ensures
- * that it does not change.
- * Methods that would change the map,
- * such as [addAll] and [remove], throw an [UnsupportedError].
- * Permitted operations defer to the wrapped map.
- */
-class UnmodifiableMapView<K, V> extends DelegatingMap<K, V>
-                                with UnmodifiableMapMixin<K, V> {
-  UnmodifiableMapView(Map<K, V> baseMap) : super(baseMap);
-}
-
-/**
- * Mixin class that implements a throwing version of all map operations that
- * change the Map.
- */
-abstract class UnmodifiableMapMixin<K, V> implements Map<K, V> {
-  static void _throw() {
-    throw new UnsupportedError("Cannot modify an unmodifiable Map");
-  }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the map are disallowed.
-   */
-  void operator []=(K key, V value) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the map are disallowed.
-   */
-  V putIfAbsent(K key, V ifAbsent()) { _throw(); }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the map are disallowed.
-   */
-  void addAll(Map<K, V> other) => _throw();
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the map are disallowed.
-   */
-  V remove(K key) { _throw(); }
-
-  /**
-   * Throws an [UnsupportedError];
-   * operations that change the map are disallowed.
-   */
-  void clear() => _throw();
-}