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323
iTechSharp/System/util/collections/Iterator.cs
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323
iTechSharp/System/util/collections/Iterator.cs
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using System;
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using System.Collections;
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namespace System.util.collections
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{
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public abstract class k_Iterator : IComparable, ICloneable
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{
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public static k_Iterator operator ++(k_Iterator ak_Iter)
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{
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return ak_Iter + 1;
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}
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public static k_Iterator operator --(k_Iterator ak_Iter)
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{
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return ak_Iter - 1;
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}
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public static k_Iterator operator +(k_Iterator ak_Iter, int ai_Distance)
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{
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k_Iterator lk_Clone = ak_Iter.Clone();
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lk_Clone.Move(ai_Distance);
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return lk_Clone;
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}
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public static k_Iterator operator -(k_Iterator ak_Iter, int ai_Distance)
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{
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k_Iterator lk_Clone = ak_Iter.Clone();
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lk_Clone.Move(-ai_Distance);
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return lk_Clone;
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}
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public static int operator -(k_Iterator ak_Left, k_Iterator ak_Right)
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{
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return ak_Left.Distance(ak_Right);
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}
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public static bool operator ==(k_Iterator ak_Left, k_Iterator ak_Right)
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{
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return object.Equals(ak_Left, ak_Right);
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}
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public static bool operator !=(k_Iterator ak_Left, k_Iterator ak_Right)
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{
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return !object.Equals(ak_Left, ak_Right);
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}
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public override bool Equals(object ak_Obj)
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{
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return base.Equals(ak_Obj); // implemented to avoid warning
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}
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public override int GetHashCode()
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{
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return base.GetHashCode(); // implemented to avoid warning
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}
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public int CompareTo(object ak_Obj)
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{
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k_Iterator lk_Iter = ak_Obj as k_Iterator;
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if (lk_Iter == null || !object.ReferenceEquals(lk_Iter.Collection, this.Collection))
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throw new ArgumentException("Cannot compare iterators of different origin.");
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return Distance(lk_Iter);
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}
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object ICloneable.Clone()
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{
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return this.Clone();
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}
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public void Next()
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{
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Move(1);
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}
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public void Prev()
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{
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Move(-1);
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}
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public abstract object Current { get; set; }
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public abstract object Collection { get; }
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public abstract k_Iterator Clone();
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public abstract void Move(int ai_Count);
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public abstract int Distance(k_Iterator ak_Iter);
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}
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public class k_IteratorEnumerator : IEnumerator
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{
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protected k_Iterator mk_Current;
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protected k_Iterator mk_Begin, mk_End;
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protected bool mb_Fresh;
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public k_IteratorEnumerator(k_Iterator ak_Begin, k_Iterator ak_End)
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{
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mk_Begin = ak_Begin;
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mk_End = ak_End;
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mb_Fresh = true;
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}
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#region IEnumerator Members
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public bool MoveNext()
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{
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if (mb_Fresh)
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{
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mk_Current = mk_Begin.Clone();
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mb_Fresh = false;
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}
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else if (mk_Current != mk_End)
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mk_Current.Next();
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return (mk_Current != mk_End);
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}
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public void Reset()
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{
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mb_Fresh = true;
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mk_Current = null;
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}
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public object Current
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{
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get
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{
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if (mb_Fresh || mk_Current == mk_End)
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throw new InvalidOperationException("The enumerator is positioned before the first element of the collection or after the last element.");
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return mk_Current.Current;
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}
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}
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#endregion
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}
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public class k_IteratorDictEnumerator : k_IteratorEnumerator, IDictionaryEnumerator
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{
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public k_IteratorDictEnumerator(k_Iterator ak_Begin, k_Iterator ak_End)
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: base(ak_Begin, ak_End)
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{
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}
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#region IDictionaryEnumerator Members
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public object Key
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{
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get { return this.Entry.Key; }
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}
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public object Value
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{
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get { return this.Entry.Value; }
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}
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public DictionaryEntry Entry
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{
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get { return (DictionaryEntry)this.Current; }
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}
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#endregion
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}
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public class k_IListIterator : k_Iterator
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{
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private readonly IList mk_List;
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private int mi_Index;
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public static k_IListIterator CreateBegin(IList ak_List)
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{
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return new k_PinnedIListIterator(ak_List, 0);
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}
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public static k_IListIterator CreateEnd(IList ak_List)
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{
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return new k_PinnedIListIterator(ak_List, ak_List.Count);
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}
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public k_IListIterator(IList ak_List, int ai_Index)
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{
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mk_List = ak_List;
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mi_Index = ai_Index;
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}
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public override void Move(int ai_Count)
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{
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int li_Index = mi_Index + ai_Count;
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if (li_Index < 0)
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throw new InvalidOperationException("Tried to move before first element.");
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else if (li_Index > mk_List.Count)
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throw new InvalidOperationException("Tried to moved beyond end element.");
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mi_Index = li_Index;
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}
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public override int Distance(k_Iterator ak_Iter)
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{
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return mi_Index - ((k_IListIterator)ak_Iter).mi_Index;
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}
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public override object Collection
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{
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get { return mk_List; }
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}
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public override object Current
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{
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get
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{
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if (mi_Index < 0 || mi_Index >= mk_List.Count)
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throw new k_InvalidPositionException();
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return mk_List[mi_Index];
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}
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set
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{
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if (mi_Index < 0 || mi_Index >= mk_List.Count)
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throw new k_InvalidPositionException();
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mk_List[mi_Index] = value;
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}
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}
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public override bool Equals(object ak_Obj)
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{
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k_IListIterator lk_Iter = ak_Obj as k_IListIterator;
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if (lk_Iter == null)
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return false;
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return (mi_Index == lk_Iter.mi_Index) && object.ReferenceEquals(this.Collection, lk_Iter.Collection);
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}
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public override int GetHashCode()
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{
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return mk_List.GetHashCode() ^ mi_Index;
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}
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public override k_Iterator Clone()
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{
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return new k_IListIterator(mk_List, mi_Index);
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}
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internal int Index
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{
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get { return mi_Index; }
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}
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}
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internal class k_PinnedIListIterator : k_IListIterator
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{
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public k_PinnedIListIterator(IList ak_List, int ai_Index)
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: base(ak_List, ai_Index)
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{
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}
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public override void Move(int ai_Count)
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{
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throw new k_IteratorPinnedException();
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}
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}
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public class k_CollectionOnIterators : ICollection
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{
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private k_Iterator mk_Begin, mk_End;
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private int mi_Count;
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public k_CollectionOnIterators(k_Iterator ak_Begin, k_Iterator ak_End)
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{
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mk_Begin = ak_Begin;
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mk_End = ak_End;
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mi_Count = mk_End - mk_Begin;
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}
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#region ICollection Members
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public int Count
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{
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get { return mi_Count; }
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}
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public bool IsSynchronized
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{
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get { return false; }
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}
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public object SyncRoot
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{
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get { return mk_Begin.Collection; }
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}
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public void CopyTo(Array ak_Array, int ai_Index)
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{
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foreach (object lk_Obj in this)
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ak_Array.SetValue(lk_Obj, ai_Index++);
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}
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#endregion
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#region IEnumerable Members
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public IEnumerator GetEnumerator()
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{
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return new k_IteratorEnumerator(mk_Begin, mk_End);
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}
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#endregion
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}
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[Serializable]
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public class k_IteratorPinnedException : InvalidOperationException
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{
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public k_IteratorPinnedException()
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: base("Cannot move pinned iterator. Use Clone() to create a movable copy.")
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{
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}
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}
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[Serializable]
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public class k_InvalidPositionException : InvalidOperationException
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{
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public k_InvalidPositionException()
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: base("Iterator positioned on End or invalid element.")
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{
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}
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}
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}
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