123 lines
3.1 KiB
C#
123 lines
3.1 KiB
C#
// ----------------------------------------------------------------------------
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ----------------------------------------------------------------------------
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using System;
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using System.Collections;
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using System.Text;
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namespace Microsoft.Singularity.Applications
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{
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class HashSet : ISet
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{
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Hashtable table;
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ArrayList list;
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public HashSet()
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{
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table = new Hashtable();
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list = new ArrayList();
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}
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public HashSet(ICollection i)
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: this()
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{
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AddAll(i);
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}
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public bool Contains(Object elem)
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{
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return table.ContainsKey(elem);
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}
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public void Add(Object elem)
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{
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if (Contains(elem)) return;
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int index = list.Add(elem);
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table[elem] = index;
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}
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public void AddAll(ICollection coll)
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{
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if (coll == null) return;
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foreach (Object obj in coll) {
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Add(obj);
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}
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}
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public void Remove(Object obj)
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{
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Object index = table[obj];
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if (index == null) return;
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list.RemoveAt((int)index);
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table.Remove(obj);
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}
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public int Count
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{
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get
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{
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return table.Count;
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}
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}
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public void CopyTo(System.Array arr, int n)
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{
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int i = n;
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foreach (Object key in table.Keys) {
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arr.SetValue(key, n++);
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}
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}
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public Object SyncRoot
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{
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get { throw new InvalidOperationException("operation not supported"); }
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}
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public bool IsSynchronized
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{
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get { return false; }
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}
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public override bool Equals(object obj)
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{
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if (!(obj is ISet)) return false;
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return this.ContainsAll(((ISet)obj)) && ((ISet)obj).ContainsAll(this); ; //sort maybe?
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}
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public bool ContainsAll(ISet thatCol)
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{
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foreach (DictionaryEntry entry in table) {
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Object key = entry.Key;
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ISet that = thatCol as ISet;
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if (!that.Contains(key)) return false;
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}
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return true;
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}
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public IEnumerator GetEnumerator()
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{
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return list.GetEnumerator();
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}
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public override int GetHashCode()
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{
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int hash = 0;
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foreach (DictionaryEntry entry in table) {
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hash ^= entry.Key.GetHashCode();
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}
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return hash;
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}
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public override string ToString()
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{
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StringBuilder sb = new StringBuilder();
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bool first = true;
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foreach (Object elem in table.Keys) {
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sb.Append(elem.ToString() + (first ? "" : " , "));
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}
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return sb.ToString();
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}
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}
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}
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