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Iterator.cs
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Iterator.cs
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using System;
using System.Collections.Generic;
namespace Iterator
{
public abstract class Array
{
public abstract object this[int index] { get; set; }
public abstract Iterator CreateIterator();
public abstract int Count { get; protected set; }
}
public class ConcreteArray: Array
{
private readonly List<int> _arraylist = new List<int>();
public override Iterator CreateIterator()
{
return new ConcreteIterator(this);
}
public override int Count
{
get { return _arraylist.Count; }
protected set { }
}
public override object this[int index]
{
get { return this._arraylist[index]; }
set
{
this._arraylist.Insert(index, (int)value);
}
}
}
public abstract class Iterator
{
public abstract object First();
public abstract object Next();
public abstract bool IsDone();
public abstract object CurrentItem();
}
public class ConcreteIterator: Iterator
{
private Array _array;
private int _current;
public ConcreteIterator(Array array)
{
this._array = array;
this._current = 0;
}
public override object First()
{
if (_array.Count > 0)
{
return (int)_array[0];
}
return null;
}
public override object Next()
{
_current++;
if (_current < _array.Count)
{
return (int)_array[_current];
}
return null;
}
public override bool IsDone()
{
return _current >= _array.Count;
}
public override object CurrentItem()
{
return (int)_array[_current];
}
}
}