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//------------------------------------------------------------------------------
// <copyright file="ParseChildrenAsPropertiesAttribute.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI {
using System;
using System.Collections;
using System.ComponentModel;
using System.Security.Permissions;
using System.Web.Util;
/// <devdoc>
/// Define the metadata attribute that controls use to mark the fact
/// that their children are in fact properties.
/// Furthermore, if a string is passed in the constructor, it specifies
/// the name of the defaultproperty.
/// </devdoc>
[AttributeUsage(AttributeTargets.Class)]
public sealed class ParseChildrenAttribute : Attribute {
public static readonly ParseChildrenAttribute ParseAsChildren = new ParseChildrenAttribute(false, false);
public static readonly ParseChildrenAttribute ParseAsProperties = new ParseChildrenAttribute(true, false);
public static readonly ParseChildrenAttribute Default = ParseAsChildren;
private bool _childrenAsProps;
private string _defaultProperty;
private Type _childControlType;
private bool _allowChanges = true;
/// <devdoc>
/// Needed to use named parameters (ASURT 78869)
/// </devdoc>
public ParseChildrenAttribute() : this(false, null) {
}
/// <devdoc>
/// </devdoc>
public ParseChildrenAttribute(bool childrenAsProperties) : this(childrenAsProperties, null) {
}
public ParseChildrenAttribute(Type childControlType) : this(false, null) {
if (childControlType == null) {
throw new ArgumentNullException("childControlType");
}
_childControlType = childControlType;
}
/// <devdoc>
/// Needed to create immutable static readonly instances of this attribute
/// </devdoc>
private ParseChildrenAttribute(bool childrenAsProperties, bool allowChanges) : this(childrenAsProperties, null) {
_allowChanges = allowChanges;
}
/// <devdoc>
/// </devdoc>
public ParseChildrenAttribute(bool childrenAsProperties, string defaultProperty) {
_childrenAsProps = childrenAsProperties;
if (_childrenAsProps == true) {
_defaultProperty = defaultProperty;
}
}
/// <devdoc>
/// <para>Indicates the allowed child control type.
/// This property is read-only.</para>
/// </devdoc>
public Type ChildControlType {
get {
if (_childControlType == null) {
return typeof(System.Web.UI.Control);
}
return _childControlType;
}
}
/// <devdoc>
/// </devdoc>
public bool ChildrenAsProperties {
get {
return _childrenAsProps;
}
set {
if (_allowChanges == false) {
throw new NotSupportedException();
}
_childrenAsProps = value;
}
}
/// <devdoc>
/// </devdoc>
public string DefaultProperty {
get {
if (_defaultProperty == null) {
return String.Empty;
}
return _defaultProperty;
}
set {
if (_allowChanges == false) {
throw new NotSupportedException();
}
_defaultProperty = value;
}
}
/// <internalonly/>
/// <devdoc>
/// </devdoc>
public override int GetHashCode() {
if (_childrenAsProps == false) {
return HashCodeCombiner.CombineHashCodes(_childrenAsProps.GetHashCode(), _childControlType.GetHashCode());
}
else {
return HashCodeCombiner.CombineHashCodes(_childrenAsProps.GetHashCode(), DefaultProperty.GetHashCode());
}
}
/// <internalonly/>
/// <devdoc>
/// </devdoc>
public override bool Equals(object obj) {
if (obj == this) {
return true;
}
ParseChildrenAttribute pca = obj as ParseChildrenAttribute;
if (pca != null) {
if (_childrenAsProps == false) {
return pca.ChildrenAsProperties == false &&
pca._childControlType == _childControlType;
}
else {
return pca.ChildrenAsProperties && (DefaultProperty.Equals(pca.DefaultProperty));
}
}
return false;
}
/// <internalonly/>
/// <devdoc>
/// </devdoc>
public override bool IsDefaultAttribute() {
return this.Equals(Default);
}
}
}
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