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//
// System.Collections.CollectionBase.cs
//
// Author:
// Nick Drochak II (ndrochak@gol.com)
//
// (C) 2001 Nick Drochak II
//
using System;
namespace System.Collections {
[Serializable]
public abstract class CollectionBase : IList, ICollection, IEnumerable {
// private instance properties
private ArrayList myList;
// public instance properties
public int Count { get { return InnerList.Count; } }
// Public Instance Methods
public IEnumerator GetEnumerator() { return InnerList.GetEnumerator(); }
public void Clear() {
OnClear();
InnerList.Clear();
OnClearComplete();
}
public void RemoveAt (int index) {
object objectToRemove;
objectToRemove = InnerList[index];
OnValidate(objectToRemove);
OnRemove(index, objectToRemove);
InnerList.RemoveAt(index);
OnRemoveComplete(index, objectToRemove);
}
// Protected Instance Constructors
protected CollectionBase() {
this.myList = new ArrayList();
}
// Protected Instance Properties
protected ArrayList InnerList {get { return this.myList; } }
protected IList List {get { return this; } }
// Protected Instance Methods
protected virtual void OnClear() { }
protected virtual void OnClearComplete() { }
protected virtual void OnInsert(int index, object value) { }
protected virtual void OnInsertComplete(int index, object value) { }
protected virtual void OnRemove(int index, object value) { }
protected virtual void OnRemoveComplete(int index, object value) { }
protected virtual void OnSet(int index, object oldValue, object newValue) { }
protected virtual void OnSetComplete(int index, object oldValue, object newValue) { }
protected virtual void OnValidate(object value) {
if (null == value) {
throw new System.ArgumentNullException("CollectionBase.OnValidate: Invalid parameter value passed to method: null");
}
}
// ICollection methods
void ICollection.CopyTo(Array array, int index) {
InnerList.CopyTo(array, index);
}
object ICollection.SyncRoot {
get { return InnerList.SyncRoot; }
}
bool ICollection.IsSynchronized {
get { return InnerList.IsSynchronized; }
}
// IList methods
int IList.Add (object value) {
int newPosition;
OnValidate(value);
newPosition = InnerList.Count;
OnInsert(newPosition, value);
InnerList.Add(value);
OnInsertComplete(newPosition, value);
return newPosition;
}
bool IList.Contains (object value) {
return InnerList.Contains(value);
}
int IList.IndexOf (object value) {
return InnerList.IndexOf(value);
}
void IList.Insert (int index, object value) {
OnValidate(value);
OnInsert(index, value);
InnerList.Insert(index, value);
OnInsertComplete(index, value);
}
void IList.Remove (object value) {
int removeIndex;
OnValidate(value);
removeIndex = InnerList.IndexOf(value);
OnRemove(removeIndex, value);
InnerList.Remove(value);
OnRemoveComplete(removeIndex, value);
}
// IList properties
bool IList.IsFixedSize {
get { return InnerList.IsFixedSize; }
}
bool IList.IsReadOnly {
get { return InnerList.IsReadOnly; }
}
object IList.this[int index] {
get { return InnerList[index]; }
set {
object oldValue;
// make sure we have been given a valid value
OnValidate(value);
// save a reference to the object that is in the list now
oldValue = InnerList[index];
OnSet(index, oldValue, value);
InnerList[index] = value;
OnSetComplete(index, oldValue, value);
}
}
}
}
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