namespace pop
{
    using Hashtable   = System.Collections.Hashtable;
    using ICollection = System.Collections.ICollection;
    using IEnumerator = System.Collections.IEnumerator;
    using Object      = System.Object;
    using String      = System.String;
    public class PopImpl: Pop
    {
        private Hashtable   iPop;
        private IEnumerator iIEnumerator;
        public PopImpl()
        {
            iPop = new Hashtable();
            iIEnumerator = null;
        }
        public bool Add(Person pPerson)
        {
            String tName = pPerson.Name;
            if (iPop.Contains(tName))
            {
                return false;
            }
            iPop.Add(tName, pPerson);
            return true;
        }
        public bool Remove(String pName)
        {
            if (iPop.Contains(pName))
            {
                iPop.Remove(pName);
                return true;
            }
            return false;
        }
        public Person Get(String pName)
        {
            return (Person)iPop[pName];
        }
        public Person GetFirst()
        {
            ICollection tICollection = iPop.Values;
            iIEnumerator = tICollection.GetEnumerator();
            return Next();
        }
        public Person Next()
        {
            if (iIEnumerator.MoveNext())
            {
                return (Person)iIEnumerator.Current;
            }
            return null;
        }
        public int Size
        {
            get
            {
                return iPop.Count;
            }
        }
        public override bool Equals(Object pObject)
        {
            PopImpl tPopImpl = (PopImpl)pObject;
            return iPop.Equals(tPopImpl.iPop);
        }
        public override int GetHashCode()
        {
            return iPop.GetHashCode();
        }
        public override String ToString()
        {
            return iPop.ToString();
        }
    }
}