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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.
//
// Description:
// ContentLocatorBase represents an object that identifies a piece of data. It
// can be an ordered list of ContentLocatorParts (in which case its a
// ContentLocator) or it can be a set of Locators (in which case its a
// ContentLocatorGroup).
//
// Spec: Simplifying Store Cache Model.doc
//
using System.ComponentModel;
using MS.Internal.Annotations;
namespace System.Windows.Annotations
{
/// <summary>
/// ContentLocatorBase represents an object that identifies a piece of data.
/// It can be an ordered list of ContentLocatorParts (in which case its a
/// ContentLocator) or it can be a set of Locators (in which case its a ContentLocatorGroup).
/// </summary>
public abstract class ContentLocatorBase : INotifyPropertyChanged2, IOwnedObject
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
/// <summary>
/// Internal constructor. This makes the abstract class
/// unsubclassable by third-parties, as desired.
/// </summary>
internal ContentLocatorBase()
{
}
#endregion Constructors
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
/// <summary>
/// Create a deep clone of this ContentLocatorBase.
/// </summary>
/// <returns>a deep clone of this ContentLocatorBase; never returns null</returns>
public abstract object Clone();
#endregion Public Methods
//------------------------------------------------------
//
// Public Operators
//
//------------------------------------------------------
//------------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
//------------------------------------------------------
//
// Internal Events
//
//------------------------------------------------------
#region Public Events
/// <summary>
///
/// </summary>
event PropertyChangedEventHandler INotifyPropertyChanged.PropertyChanged
{
add{ _propertyChanged += value; }
remove{ _propertyChanged -= value; }
}
#endregion Public Events
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
/// <summary>
/// Notify the owner this ContentLocatorBase has changed.
/// This method should be protected so only subclasses
/// could call it but that would expose it in the
/// public API space so we keep it internal.
/// </summary>
internal void FireLocatorChanged(string name)
{
if (_propertyChanged != null)
{
_propertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(name));
}
}
/// <summary>
/// </summary>
bool IOwnedObject.Owned
{
get
{
return _owned;
}
set
{
_owned = value;
}
}
/// <summary>
/// Internal Merge method used by the LocatorManager as it builds up
/// Locators. We don't expose these methods publicly because they
/// are of little use and are optimized for use by the LM (e.g., we
/// know the arguments aren't owned by anyone and can be modified in
/// place).
/// </summary>
/// <param name="other">the ContentLocatorBase to merge</param>
/// <returns>the resulting ContentLocatorBase (may be the same object the method
/// was called on for perf reasons)</returns>
internal abstract ContentLocatorBase Merge(ContentLocatorBase other);
#endregion Internal Methods
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
/// <summary>
/// </summary>
private bool _owned;
/// <summary>
///
/// </summary>
private event PropertyChangedEventHandler _propertyChanged;
#endregion Private Fields
}
}
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