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//------------------------------------------------------------------------------
// <copyright file="DataBindingCollection.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI {
using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Data;
using System.Web.Util;
using System.Security.Permissions;
/// <devdoc>
/// </devdoc>
public sealed class DataBindingCollection : ICollection {
private EventHandler changedEvent;
private Hashtable bindings;
private Hashtable removedBindings;
/// <devdoc>
/// </devdoc>
public DataBindingCollection() {
this.bindings = new Hashtable(StringComparer.OrdinalIgnoreCase);
}
/// <devdoc>
/// </devdoc>
public int Count {
get {
return bindings.Count;
}
}
/// <devdoc>
/// </devdoc>
public bool IsReadOnly {
get {
return false;
}
}
/// <devdoc>
/// </devdoc>
public bool IsSynchronized {
get {
return false;
}
}
/// <devdoc>
/// </devdoc>
public string[] RemovedBindings {
get {
int bindingCount = 0;
ICollection keys = null;
if (removedBindings != null) {
keys = removedBindings.Keys;
bindingCount = keys.Count;
string[] removedNames = new string[bindingCount];
int i = 0;
foreach (string s in keys) {
removedNames[i++] = s;
}
removedBindings.Clear();
return removedNames;
}
else {
return new string[0];
}
}
}
/// <devdoc>
/// </devdoc>
private Hashtable RemovedBindingsTable {
get {
if (removedBindings == null) {
removedBindings = new Hashtable(StringComparer.OrdinalIgnoreCase);
}
return removedBindings;
}
}
/// <devdoc>
/// </devdoc>
public object SyncRoot {
get {
return this;
}
}
/// <devdoc>
/// </devdoc>
public DataBinding this[string propertyName] {
get {
object o = bindings[propertyName];
if (o != null)
return(DataBinding)o;
return null;
}
}
public event EventHandler Changed {
add {
changedEvent = (EventHandler)Delegate.Combine(changedEvent, value);
}
remove {
changedEvent = (EventHandler)Delegate.Remove(changedEvent, value);
}
}
/// <devdoc>
/// </devdoc>
public void Add(DataBinding binding) {
bindings[binding.PropertyName] = binding;
RemovedBindingsTable.Remove(binding.PropertyName);
OnChanged();
}
/// <devdoc>
/// </devdoc>
public bool Contains(string propertyName) {
return bindings.Contains(propertyName);
}
/// <devdoc>
/// </devdoc>
public void Clear() {
ICollection keys = bindings.Keys;
if ((keys.Count != 0) && (removedBindings == null)) {
// ensure the removedBindings hashtable is created
Hashtable h = RemovedBindingsTable;
}
foreach (string s in keys) {
removedBindings[s] = String.Empty;
}
bindings.Clear();
OnChanged();
}
/// <devdoc>
/// </devdoc>
public void CopyTo(Array array, int index) {
for (IEnumerator e = this.GetEnumerator(); e.MoveNext();)
array.SetValue(e.Current, index++);
}
/// <devdoc>
/// </devdoc>
public IEnumerator GetEnumerator() {
return bindings.Values.GetEnumerator();
}
private void OnChanged() {
if (changedEvent != null) {
changedEvent(this, EventArgs.Empty);
}
}
/// <devdoc>
/// </devdoc>
public void Remove(string propertyName) {
Remove(propertyName, true);
}
/// <devdoc>
/// </devdoc>
public void Remove(DataBinding binding) {
Remove(binding.PropertyName, true);
}
/// <devdoc>
/// </devdoc>
public void Remove(string propertyName, bool addToRemovedList) {
if (Contains(propertyName)) {
bindings.Remove(propertyName);
if (addToRemovedList) {
RemovedBindingsTable[propertyName] = String.Empty;
}
OnChanged();
}
}
}
}
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