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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// <OWNER>[....]</OWNER>
//
namespace System.Collections {
using System;
using System.Security.Permissions;
// Useful base class for typed read/write collections where items derive from object
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class DictionaryBase : IDictionary {
Hashtable hashtable;
protected Hashtable InnerHashtable {
get {
if (hashtable == null)
hashtable = new Hashtable();
return hashtable;
}
}
protected IDictionary Dictionary {
get { return (IDictionary) this; }
}
public int Count {
// to avoid newing inner list if no items are ever added
get { return hashtable == null ? 0 : hashtable.Count; }
}
bool IDictionary.IsReadOnly {
get { return InnerHashtable.IsReadOnly; }
}
bool IDictionary.IsFixedSize {
get { return InnerHashtable.IsFixedSize; }
}
bool ICollection.IsSynchronized {
get { return InnerHashtable.IsSynchronized; }
}
ICollection IDictionary.Keys {
get {
return InnerHashtable.Keys;
}
}
Object ICollection.SyncRoot {
get { return InnerHashtable.SyncRoot; }
}
ICollection IDictionary.Values {
get {
return InnerHashtable.Values;
}
}
public void CopyTo(Array array, int index) {
InnerHashtable.CopyTo(array, index);
}
object IDictionary.this[object key] {
get {
object currentValue = InnerHashtable[key];
OnGet(key, currentValue);
return currentValue;
}
set {
OnValidate(key, value);
bool keyExists = true;
Object temp = InnerHashtable[key];
if( temp == null) {
keyExists = InnerHashtable.Contains(key);
}
OnSet(key, temp, value);
InnerHashtable[key] = value;
try {
OnSetComplete(key, temp, value);
}
catch {
if( keyExists) {
InnerHashtable[key] = temp;
}
else {
InnerHashtable.Remove(key);
}
throw;
}
}
}
bool IDictionary.Contains(object key) {
return InnerHashtable.Contains(key);
}
void IDictionary.Add(object key, object value) {
OnValidate(key, value);
OnInsert(key, value);
InnerHashtable.Add(key, value);
try {
OnInsertComplete(key, value);
}
catch {
InnerHashtable.Remove(key);
throw;
}
}
public void Clear() {
OnClear();
InnerHashtable.Clear();
OnClearComplete();
}
void IDictionary.Remove(object key) {
if(InnerHashtable.Contains(key)) {
Object temp = InnerHashtable[key];
OnValidate(key, temp);
OnRemove(key, temp);
InnerHashtable.Remove(key);
try {
OnRemoveComplete(key, temp);
}
catch {
InnerHashtable.Add(key, temp);
throw;
}
}
}
public IDictionaryEnumerator GetEnumerator() {
return InnerHashtable.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator() {
return InnerHashtable.GetEnumerator();
}
protected virtual object OnGet(object key, object currentValue) {
return currentValue;
}
protected virtual void OnSet(object key, object oldValue, object newValue) {
}
protected virtual void OnInsert(object key, object value) {
}
protected virtual void OnClear() {
}
protected virtual void OnRemove(object key, object value) {
}
protected virtual void OnValidate(object key, object value) {
}
protected virtual void OnSetComplete(object key, object oldValue, object newValue) {
}
protected virtual void OnInsertComplete(object key, object value) {
}
protected virtual void OnClearComplete() {
}
protected virtual void OnRemoveComplete(object key, object value) {
}
}
}
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