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/// <summary>
/// Copyright (C) 2004-2016 Free Software Foundation, Inc.
///
/// Author: Alexander Gnauck AG-Software, mailto:gnauck@ag-software.de
///
/// This file is part of GNU Libidn.
///
/// GNU Libidn is free software: you can redistribute it and/or
/// modify it under the terms of either:
///
/// * the GNU Lesser General Public License as published by the Free
/// Software Foundation; either version 3 of the License, or (at
/// your option) any later version.
///
/// or
///
/// * the GNU General Public License as published by the Free
/// Software Foundation; either version 2 of the License, or (at
/// your option) any later version.
///
/// or both in parallel, as here.
///
/// GNU Libidn is distributed in the hope that it will be useful,
/// but WITHOUT ANY WARRANTY; without even the implied warranty of
/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
/// General Public License for more details.
///
/// You should have received copies of the GNU General Public License and
/// the GNU Lesser General Public License along with this program. If
/// not, see <http://www.gnu.org/licenses/>.
/// </summary>
using System;
using System.Collections;
namespace gnu.inet.encoding.misc
{
/// <summary>
/// HashSet class.
/// </summary>
public class HashSet : ArrayList
{
public HashSet() : base()
{
}
public HashSet(System.Collections.ICollection c)
{
this.AddAll(c);
}
public HashSet(int capacity) : base(capacity)
{
}
/// <summary>
/// Adds a new element to the ArrayList if it is not already present.
/// </summary>
/// <param name="obj">Element to insert to the ArrayList.</param>
/// <returns>Returns true if the new element was inserted, false otherwise.</returns>
new public virtual bool Add(System.Object obj)
{
bool inserted;
if ((inserted = this.Contains(obj)) == false)
{
base.Add(obj);
}
return !inserted;
}
/// <summary>
/// Adds all the elements of the specified collection that are not present to the list.
/// </summary>
/// <param name="c">Collection where the new elements will be added</param>
/// <returns>Returns true if at least one element was added, false otherwise.</returns>
public bool AddAll(System.Collections.ICollection c)
{
System.Collections.IEnumerator e = new System.Collections.ArrayList(c).GetEnumerator();
bool added = false;
while (e.MoveNext() == true)
{
if (this.Add(e.Current) == true)
added = true;
}
return added;
}
/// <summary>
/// Returns a copy of the HashSet instance.
/// </summary>
/// <returns>Returns a shallow copy of the current HashSet.</returns>
public override System.Object Clone()
{
return base.MemberwiseClone();
}
}
}
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