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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
//
namespace System.Collections {
using System;
using System.Diagnostics.Contracts;
// Useful base class for typed read/write collections where items derive from object
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class CollectionBase : IList {
ArrayList list;
protected CollectionBase() {
list = new ArrayList();
}
protected CollectionBase(int capacity) {
list = new ArrayList(capacity);
}
protected ArrayList InnerList {
get {
if (list == null)
list = new ArrayList();
return list;
}
}
protected IList List {
get { return (IList)this; }
}
[System.Runtime.InteropServices.ComVisible(false)]
public int Capacity {
get {
return InnerList.Capacity;
}
set {
InnerList.Capacity = value;
}
}
public int Count {
get {
return list == null ? 0 : list.Count;
}
}
public void Clear() {
OnClear();
InnerList.Clear();
OnClearComplete();
}
public void RemoveAt(int index) {
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index"));
Contract.EndContractBlock();
Object temp = InnerList[index];
OnValidate(temp);
OnRemove(index, temp);
InnerList.RemoveAt(index);
try {
OnRemoveComplete(index, temp);
}
catch {
InnerList.Insert(index, temp);
throw;
}
}
bool IList.IsReadOnly {
get { return InnerList.IsReadOnly; }
}
bool IList.IsFixedSize {
get { return InnerList.IsFixedSize; }
}
bool ICollection.IsSynchronized {
get { return InnerList.IsSynchronized; }
}
Object ICollection.SyncRoot {
get { return InnerList.SyncRoot; }
}
void ICollection.CopyTo(Array array, int index) {
InnerList.CopyTo(array, index);
}
Object IList.this[int index] {
get {
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index"));
Contract.EndContractBlock();
return InnerList[index];
}
set {
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index"));
Contract.EndContractBlock();
OnValidate(value);
Object temp = InnerList[index];
OnSet(index, temp, value);
InnerList[index] = value;
try {
OnSetComplete(index, temp, value);
}
catch {
InnerList[index] = temp;
throw;
}
}
}
bool IList.Contains(Object value) {
return InnerList.Contains(value);
}
int IList.Add(Object value) {
OnValidate(value);
OnInsert(InnerList.Count, value);
int index = InnerList.Add(value);
try {
OnInsertComplete(index, value);
}
catch {
InnerList.RemoveAt(index);
throw;
}
return index;
}
void IList.Remove(Object value) {
OnValidate(value);
int index = InnerList.IndexOf(value);
if (index < 0) throw new ArgumentException(Environment.GetResourceString("Arg_RemoveArgNotFound"));
OnRemove(index, value);
InnerList.RemoveAt(index);
try{
OnRemoveComplete(index, value);
}
catch {
InnerList.Insert(index, value);
throw;
}
}
int IList.IndexOf(Object value) {
return InnerList.IndexOf(value);
}
void IList.Insert(int index, Object value) {
if (index < 0 || index > Count)
throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index"));
Contract.EndContractBlock();
OnValidate(value);
OnInsert(index, value);
InnerList.Insert(index, value);
try {
OnInsertComplete(index, value);
}
catch {
InnerList.RemoveAt(index);
throw;
}
}
public IEnumerator GetEnumerator() {
return InnerList.GetEnumerator();
}
protected virtual void OnSet(int index, Object oldValue, Object newValue) {
}
protected virtual void OnInsert(int index, Object value) {
}
protected virtual void OnClear() {
}
protected virtual void OnRemove(int index, Object value) {
}
protected virtual void OnValidate(Object value) {
if (value == null) throw new ArgumentNullException("value");
Contract.EndContractBlock();
}
protected virtual void OnSetComplete(int index, Object oldValue, Object newValue) {
}
protected virtual void OnInsertComplete(int index, Object value) {
}
protected virtual void OnClearComplete() {
}
protected virtual void OnRemoveComplete(int index, Object value) {
}
}
}
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