/**
* Remove from this collection all of its elements except those that are
* contained in the specified collection.
*
* @param collection Collection containing elements to be retained
*
* @exception UnsupportedOperationException if this optional operation
* is not supported by this list
*/
public override bool retainAll(java.util.Collection <Object> collection)
{
if (fast)
{
lock (this)
{
java.util.ArrayList <Object> temp = (java.util.ArrayList <Object>)list.clone();
bool result = temp.retainAll(collection);
list = temp;
return(result);
}
}
else
{
lock (list)
{
return(list.retainAll(collection));
}
}
}