Mega Code Archive
Retains the elements in the target collection that are contained in the specified collection
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#region License and Copyright
/*
* Dotnet Commons Collections
*
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place,
* Suite 330,
* Boston,
* MA 02111-1307
* USA
*
*/
#endregion
using System;
using System.Collections;
namespace Dotnet.Commons.Lang {
class MainClass{
/// <summary>
/// Retains the elements in the target collection that are contained in the specified collection
/// </summary>
/// <param name="target">Collection where the elements will be removed.</param>
/// <param name="c">Elements to be retained in the target collection.</param>
/// <returns>true</returns>
public static bool RetainAll(System.Collections.ICollection target, System.Collections.ICollection c)
{
System.Collections.IEnumerator e = new System.Collections.ArrayList(target).GetEnumerator();
System.Collections.ArrayList al = new System.Collections.ArrayList(c);
//Reflection. Invoke "retainAll" method for proprietary classes or "Remove" for each element in the collection
System.Reflection.MethodInfo method;
try
{
method = c.GetType().GetMethod("retainAll");
if (method != null)
method.Invoke(target, new System.Object[] { c });
else
{
method = c.GetType().GetMethod("Remove");
while (e.MoveNext() == true)
{
if (al.Contains(e.Current) == false)
method.Invoke(target, new System.Object[] { e.Current });
}
}
}
catch (System.Exception ex)
{
throw ex;
}
return true;
}
}
}
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