Revert "New implementation of {,Linked}Hash{Set,Map}."

sdk/lib/collection/linked_hash_set.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.
-
-part of dart.collection;
-
-class LinkedHashSet<E> extends Collection<E> implements Set<E> {
-  static const int _INITIAL_CAPACITY = 8;
-  _LinkedHashTable<E> _table;
-
-  LinkedHashSet() : _table = new _LinkedHashTable(_INITIAL_CAPACITY);
-
-  factory LinkedHashSet.from(Iterable<E> iterable) {
-    return new LinkedHashSet<E>()..addAll(iterable);
-  }
-
-  // Iterable.
-  Iterator<E> get iterator => new _LinkedHashTableKeyIterator<E>(_table);
-
-  void forEach(void action(E element)) {
-    int offset = _table._next(_LinkedHashTable._HEAD_OFFSET);
-    int modificationCount = _table._modificationCount;
-    while (offset != _LinkedHashTable._HEAD_OFFSET) {
-      E key = _table._key(offset);
-      action(key);
-      _table._checkModification(modificationCount);
-      offset = _table._next(offset);
-    }
-  }
-
-  bool get isEmpty => _table._elementCount == 0;
-
-  bool contains(Object object) => _table._get(object) >= 0;
-
-  E get first {
-    int firstOffset = _table._next(_LinkedHashTable._HEAD_OFFSET);
-    if (firstOffset == _LinkedHashTable._HEAD_OFFSET) {
-      throw new StateError("No elements");
-    }
-    return _table._key(firstOffset);
-  }
-
-  E get last {
-    int lastOffset = _table._prev(_LinkedHashTable._HEAD_OFFSET);
-    if (lastOffset == _LinkedHashTable._HEAD_OFFSET) {
-      throw new StateError("No elements");
-    }
-    return _table._key(lastOffset);
-  }
-
-  E get single {
-    int firstOffset = _table._next(_LinkedHashTable._HEAD_OFFSET);
-    if (firstOffset == _LinkedHashTable._HEAD_OFFSET) {
-      throw new StateError("No elements");
-    }
-    int lastOffset = _table._prev(_LinkedHashTable._HEAD_OFFSET);
-    if (lastOffset != firstOffset) {
-      throw new StateError("Too many elements");
-    }
-    return _table._key(firstOffset);
-  }
-
-  // Collection.
-  void add(E element) {
-    _table._put(element);
-    _table._checkCapacity();
-  }
-
-  void addAll(Iterable<E> objects) {
-    for (E object in objects) {
-      _table._put(object);
-      _table._checkCapacity();
-    }
-  }
-
-  bool remove(Object object) {
-    int offset = _table._remove(object);
-    if (offset >= 0) {
-      _table._checkCapacity();
-      return true;
-    }
-    return false;
-  }
-
-  void removeAll(Iterable objectsToRemove) {
-    for (Object object in objectsToRemove) {
-      _table._remove(object);
-      _table._checkCapacity();
-    }
-  }
-
-  void retainAll(Iterable objectsToRemove) {
-    IterableMixinWorkaround.retainAll(this, objectsToRemove);
-  }
-
-  void _filterMatching(bool test(E element), bool removeMatching) {
-    int entrySize = _table._entrySize;
-    int length = _table._table.length;
-    int offset = _table._next(_LinkedHashTable._HEAD_OFFSET);
-    while (offset != _LinkedHashTable._HEAD_OFFSET) {
-      E key = _table._key(offset);
-      int nextOffset = _table._next(offset);
-      int modificationCount = _table._modificationCount;
-      bool remove = (removeMatching == test(key));
-      _table._checkModification(modificationCount);
-      if (remove) {
-        _table._deleteEntry(offset);
-      }
-      offset = nextOffset;
-    }
-    _table._checkCapacity();
-  }
-
-  void removeMatching(bool test(E element)) {
-    _filterMatching(test, true);
-  }
-
-  void retainMatching(bool test(E element)) {
-    _filterMatching(test, false);
-  }
-
-  void clear() {
-    _table._clear();
-  }
-
-  // Set.
-  bool isSubsetOf(Collection<E> collection) {
-    Set otherSet;
-    if (collection is Set) {
-      otherSet = collection;
-    } else {
-      otherSet = collection.toSet();
-    }
-    return otherSet.containsAll(this);
-  }
-
-  bool containsAll(Collection<E> collection) {
-    for (E element in collection) {
-      if (!this.contains(element)) return false;
-    }
-    return true;
-  }
-
-  Set<E> intersection(Collection<E> other) {
-    Set<E> result = new LinkedHashSet<E>();
-    for (E element in other) {
-      if (this.contains(element)) {
-        result.add(element);
-      }
-    }
-    return result;
-  }
-
-  String toString() => Collections.collectionToString(this);
-}