Browse Source
git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3622 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61shortcuts
Daniel Grunwald
18 years ago
6 changed files with 104 additions and 218 deletions
@ -1,194 +0,0 @@
@@ -1,194 +0,0 @@
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// <file>
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// <copyright see="prj:///doc/copyright.txt"/>
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// <license see="prj:///doc/license.txt"/>
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// <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
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// <version>$Revision$</version>
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// </file>
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using System; |
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using System.Collections; |
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using System.Collections.Generic; |
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using System.Collections.Specialized; |
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namespace ICSharpCode.SharpDevelop |
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{ |
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/// <summary>
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/// Represents a set of items. The set does not preserve the order of items and does not allow items to
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/// be added twice.
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/// It is cloned by sharing the underlying data structure and delaying the actual copy until the next change.
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/// </summary>
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix")] |
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public sealed class HashSet<T> : ICollection<T>, ICollection, ICloneable |
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where T : class |
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{ |
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Dictionary<T, object> _dict; |
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bool _copyOnWrite; |
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/// <summary>
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/// Creates a new, empty set.
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/// </summary>
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public HashSet() |
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{ |
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_dict = new Dictionary<T, object>(); |
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} |
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/// <summary>
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/// Creates a copy of the existing set.
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/// </summary>
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public HashSet(HashSet<T> existingSet) |
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{ |
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existingSet._copyOnWrite = true; |
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this._copyOnWrite = true; |
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_dict = existingSet._dict; |
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} |
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/// <summary>
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/// Adds the item to the set.
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/// Trying to add <c>null</c> will return false without changing the collection.
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/// </summary>
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/// <returns>True when the item was added, false when it was not added because it already is in the set</returns>
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public bool Add(T item) |
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{ |
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if (item == null) |
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return false; |
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if (_dict.ContainsKey(item)) { |
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return false; |
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} else { |
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CopyIfRequired(); |
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_dict.Add(item, null); |
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return true; |
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} |
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} |
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/// <summary>
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/// Adds a list of items to the set. This is equivalent to calling <see cref="Add"/> for each item in <paramref name="items"/>.
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/// </summary>
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public void AddRange(IEnumerable<T> items) |
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{ |
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foreach (T item in items) { |
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Add(item); |
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} |
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} |
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private void CopyIfRequired() |
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{ |
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if (_copyOnWrite) { |
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_copyOnWrite = false; |
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_dict = new Dictionary<T, object>(_dict); |
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} |
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} |
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/// <summary>
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/// Removes all items from the set.
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/// </summary>
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public void Clear() |
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{ |
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_dict.Clear(); |
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} |
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/// <summary>
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/// Tests if this set contains the specified item.
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/// Checking for <c>null</c> always returns false.
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/// </summary>
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public bool Contains(T item) |
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{ |
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if (item == null) |
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return false; |
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else |
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return _dict.ContainsKey(item); |
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} |
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/// <summary>
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/// Gets the number of items in the collection.
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/// </summary>
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public int Count |
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{ |
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get { return _dict.Count; } |
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} |
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/// <summary>
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/// Removes an item from the set.
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/// Trying to remove <c>null</c> will return false without changing the collection.
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/// </summary>
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public bool Remove(T item) |
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{ |
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if (item == null) |
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return false; |
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CopyIfRequired(); |
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if (_dict.Remove(item)) { |
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return true; |
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} else { |
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return false; |
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} |
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} |
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/// <summary>
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/// Copy all items to the specified array.
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/// </summary>
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void ICollection<T>.CopyTo(T[] array, int arrayIndex) |
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{ |
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_dict.Keys.CopyTo(array, arrayIndex); |
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} |
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void ICollection<T>.Add(T item) |
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{ |
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this.Add(item); |
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} |
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bool ICollection<T>.IsReadOnly |
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{ |
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get { return false; } |
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} |
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#region IEnumerable Members
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/// <summary>
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/// Gets an enumerator to enumerate the items in the set.
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/// </summary>
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public IEnumerator<T> GetEnumerator() |
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{ |
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return _dict.Keys.GetEnumerator(); |
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} |
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IEnumerator IEnumerable.GetEnumerator() |
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{ |
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return _dict.Keys.GetEnumerator(); |
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} |
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#endregion
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#region ICollection Members
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void ICollection.CopyTo(Array array, int index) |
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{ |
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((ICollection)_dict).CopyTo(array, index); |
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} |
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bool ICollection.IsSynchronized |
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{ |
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get { return false; } |
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} |
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object ICollection.SyncRoot |
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{ |
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get { return null; } |
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} |
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#endregion
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#region ICloneable Members
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/// <summary>
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/// Create a copy of this set.
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/// </summary>
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public HashSet<T> Clone() |
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{ |
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return new HashSet<T>(this); |
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} |
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object ICloneable.Clone() |
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{ |
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return this.Clone(); |
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} |
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#endregion
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} |
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} |
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