Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / Utils / Set.cs / 1305376 / Set.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.Text; using System.Diagnostics; using System.Linq; namespace System.Data.Common.Utils { // An interface for a set abstraction internal class Set: InternalBase, IEnumerable { #region Fields /// /// Instance of set value comparer. /// internal static readonly IEqualityComparer> ValueComparer = new SetValueComparer(); /// /// Instance of empty set with default comparer. /// internal static readonly SetEmpty = new Set ().MakeReadOnly(); private readonly HashSet _values; private bool _isReadOnly; #endregion #region Constructors /// /// Initialize set with the same values and comparer as other set. /// internal Set(Setother) : this(other._values, other.Comparer) { } /// /// Initialize empty set with default comparer. /// internal Set() : this(null, null) { } ////// Initialize a set with the given elements and using default comparer. /// internal Set(IEnumerableelements) : this(elements, null) { } /// /// Initializes an empty set with the given comparer. /// internal Set(IEqualityComparercomparer) : this(null, comparer) { } /// /// Initialize a set with the given elements and comparer. /// internal Set(IEnumerableelements, IEqualityComparer comparer) { _values = new HashSet ( elements ?? Enumerable.Empty (), comparer ?? EqualityComparer .Default); } #endregion #region Properties /// /// Gets the number of elements in this set. /// internal int Count { get { return _values.Count; } } ////// Gets the comparer used to determine equality and hash codes for elements of the set. /// internal IEqualityComparerComparer { get { return _values.Comparer; } } #endregion #region Methods /// /// Determines whether the given element exists in the set. /// internal bool Contains(TElement element) { return _values.Contains(element); } ////// Requires: !IsReadOnly /// Adds given element to the set. If the set already contains /// the element, does nothing. /// internal void Add(TElement element) { AssertReadWrite(); _values.Add(element); } ////// Requires: !IsReadOnly /// Adds given elements to the set. If the set already contains /// one of the elements, does nothing. /// internal void AddRange(IEnumerableelements) { AssertReadWrite(); foreach (TElement element in elements) { Add(element); } } /// /// Requires: !IsReadOnly /// Removes given element from the set. If the set does not contain /// the element, does nothing. /// internal void Remove(TElement element) { AssertReadWrite(); _values.Remove(element); } ////// Requires: !IsReadOnly /// Removes all elements from the set. /// internal void Clear() { AssertReadWrite(); _values.Clear(); } ////// Returns an array containing all elements of the set. Order is arbitrary. /// internal TElement[] ToArray() { return _values.ToArray(); } ////// Requires: other set must not be null and must have the same comparer. /// Returns true if this set contains the same elements as the other set. /// internal bool SetEquals(Setother) { AssertSetCompatible(other); return _values.Count == other._values.Count && _values.IsSubsetOf(other._values); } /// /// Requires: other set must not be null and must have the same comparer. /// Returns true if all elements in this set are contained in the other set. /// internal bool IsSubsetOf(Setother) { AssertSetCompatible(other); return _values.IsSubsetOf(other._values); } /// /// Requires: other set must not be null and must have the same comparer. /// Returns true if this set and other set have some elements in common. /// internal bool Overlaps(Setother) { AssertSetCompatible(other); return _values.Overlaps(other._values); } /// /// Requires: !IsReadOnly /// Requires: other collection must not be null. /// Subtracts other set from this set, leaving the result in this. /// internal void Subtract(IEnumerableother) { AssertReadWrite(); _values.ExceptWith(other); } /// /// Requires: other collection must not be null. /// Subtracts other set from this set, returning result. /// internal SetDifference(IEnumerable other) { Set copy = new Set (this); copy.Subtract(other); return copy; } /// /// Requires: !IsReadOnly /// Requires: other collection must not be null. /// Unions other set with this set, leaving the result in this set. /// internal void Unite(IEnumerableother) { AssertReadWrite(); _values.UnionWith(other); } /// /// Requires: other collection must not be null. /// Unions other set with this set, returning the result. /// internal SetUnion(IEnumerable other) { Set copy = new Set (this); copy.Unite(other); return copy; } /// /// Requires: !IsReadOnly /// Requires: other set must not be null and must have the same comparer. /// Intersects this set and other set, leaving the result in this set. /// internal void Intersect(Setother) { AssertReadWrite(); AssertSetCompatible(other); _values.IntersectWith(other._values); } /// /// Returns a readonly version of this set. /// internal SetAsReadOnly() { if (_isReadOnly) { // once it's readonly, it's always readonly return this; } Set copy = new Set (this); copy._isReadOnly = true; return copy; } /// /// Makes this set readonly and returns this set. /// internal SetMakeReadOnly() { _isReadOnly = true; return this; } /// /// Returns aggregate hash code of all elements in this set. /// internal int GetElementsHashCode() { int hashCode = 0; foreach (TElement element in this) { hashCode ^= Comparer.GetHashCode(element); } return hashCode; } ////// Returns typed enumerator over elements of the set. /// Uses HashSet<TElement>.Enumerator to avoid boxing struct. /// public HashSet.Enumerator GetEnumerator() { return _values.GetEnumerator(); } [Conditional("DEBUG")] private void AssertReadWrite() { Debug.Assert(!_isReadOnly, "attempting to modify readonly collection"); } [Conditional("DEBUG")] private void AssertSetCompatible(Set other) { Debug.Assert(other != null, "other set null"); Debug.Assert(other.Comparer.GetType().Equals(this.Comparer.GetType())); } #endregion #region IEnumerable Members public struct Enumerator : IEnumerator { private Dictionary .KeyCollection.Enumerator keys; internal Enumerator(Dictionary .KeyCollection.Enumerator keys) { this.keys = keys; } public TElement Current { get { return keys.Current; } } public void Dispose() { keys.Dispose(); } object IEnumerator.Current { get { return ((IEnumerator)keys).Current; } } public bool MoveNext() { return keys.MoveNext(); } void System.Collections.IEnumerator.Reset() { ((System.Collections.IEnumerator)keys).Reset(); } } IEnumerator IEnumerable .GetEnumerator() { return this.GetEnumerator(); } #endregion #region IEnumerable Members /// /// Returns an untyped enumeration of elements in the set. /// ///Enumeration of set members. IEnumerator IEnumerable.GetEnumerator() { return this.GetEnumerator(); } #endregion #region InternalBase internal override void ToCompactString(StringBuilder builder) { StringUtil.ToCommaSeparatedStringSorted(builder, this); } #endregion #region Nested types private class SetValueComparer : IEqualityComparer> { bool IEqualityComparer >.Equals(Set x, Set y) { Debug.Assert(null != x && null != y, "comparer must be used only in context of Dictionary/HashSet"); return x.SetEquals(y); } int IEqualityComparer >.GetHashCode(Set obj) { Debug.Assert(null != obj, "comparer must be used only in context of Dictionary/HashSet"); return obj.GetElementsHashCode(); } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WorkflowServiceNamespace.cs
- BitmapEffect.cs
- TypographyProperties.cs
- EventItfInfo.cs
- SystemIcmpV6Statistics.cs
- FamilyCollection.cs
- PasswordRecovery.cs
- DataTrigger.cs
- TypeRefElement.cs
- SafeRegistryKey.cs
- AssertUtility.cs
- PostBackOptions.cs
- Metafile.cs
- ConfigUtil.cs
- NotCondition.cs
- safex509handles.cs
- ListViewCancelEventArgs.cs
- SQLMembershipProvider.cs
- ReadWriteSpinLock.cs
- FontStretches.cs
- KeyGesture.cs
- SqlMethodCallConverter.cs
- TransformPatternIdentifiers.cs
- ColumnTypeConverter.cs
- ErrorWebPart.cs
- GetPageCompletedEventArgs.cs
- RootNamespaceAttribute.cs
- InvalidProgramException.cs
- DataObject.cs
- WebPartActionVerb.cs
- ConnectionConsumerAttribute.cs
- _ReceiveMessageOverlappedAsyncResult.cs
- MessageQueueAccessControlEntry.cs
- TransformedBitmap.cs
- CodeDOMUtility.cs
- TextEditorThreadLocalStore.cs
- ChineseLunisolarCalendar.cs
- WriteFileContext.cs
- SliderAutomationPeer.cs
- NullRuntimeConfig.cs
- Geometry3D.cs
- XmlSerializerOperationFormatter.cs
- AspProxy.cs
- PartialCachingControl.cs
- ManagedWndProcTracker.cs
- IDictionary.cs
- BinaryMethodMessage.cs
- ResourceManager.cs
- RestHandler.cs
- Array.cs
- SimpleApplicationHost.cs
- _ConnectionGroup.cs
- SortableBindingList.cs
- ReadOnlyDictionary.cs
- ExpressionList.cs
- TypeUnloadedException.cs
- Error.cs
- VisualTarget.cs
- RSAPKCS1SignatureDeformatter.cs
- ToolStripProgressBar.cs
- SerializationObjectManager.cs
- StructuredTypeInfo.cs
- JsonReaderWriterFactory.cs
- VectorConverter.cs
- NativeMethods.cs
- PartitionedDataSource.cs
- TextModifier.cs
- WebPart.cs
- ObjectComplexPropertyMapping.cs
- UnsafeNativeMethods.cs
- TextFindEngine.cs
- FormatterServices.cs
- PasswordRecovery.cs
- HttpsChannelFactory.cs
- Rect3DConverter.cs
- CompiledQueryCacheKey.cs
- ACL.cs
- HtmlElementErrorEventArgs.cs
- BookmarkCallbackWrapper.cs
- AsymmetricKeyExchangeDeformatter.cs
- XmlSchemas.cs
- DateTimeStorage.cs
- TypeLoadException.cs
- GenericIdentity.cs
- DataGridParentRows.cs
- PrivilegeNotHeldException.cs
- NullExtension.cs
- EditorBrowsableAttribute.cs
- XmlNodeReader.cs
- TypedColumnHandler.cs
- DesignerOptionService.cs
- MethodResolver.cs
- EncodingNLS.cs
- SafeFileMappingHandle.cs
- FrameworkElementFactory.cs
- PublisherIdentityPermission.cs
- DateTimePicker.cs
- PolyBezierSegment.cs
- EncoderBestFitFallback.cs
- InvalidProgramException.cs