LocatorBase.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Annotations / LocatorBase.cs / 1305600 / LocatorBase.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 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: http://team/sites/ag/Specifications/Simplifying%20Store%20Cache%20Model.doc
// 
// History:
//  10/04/2002: rruiz:    Added header comment to ObjectModel.cs 
//  07/03/2003: magedz:   Renamed Link, LinkSequence to LocatorPart and Locator 
//                        respectively.
//  05/31/2003: LGolding: Ported to WCP tree. 
//  07/15/2003: rruiz:    Rewrote implementations to extend abstract classes
//                        instead of implement interfaces; got rid of obsolete
//                        classes; put each class in separate file.
//  12/09/2003: ssimova:  Added Id property 
//  12/03/2003: ssimova:  Changed LocatorParts to Parts
//  06/20/2004: rruiz:    Stripped out most of the API and made this an abstract 
//                        class which supports notifying its owner of changes. 
//                        New concrete classes were introduced for sets and
//                        sequences. 
//-----------------------------------------------------------------------------
using System;
using System.Collections;
using System.ComponentModel; 
using System.Diagnostics;
using System.Xml; 
 
using MS.Internal.Annotations;
 
namespace System.Windows.Annotations
{
    /// 
    ///     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). 
    ///  
    public abstract class ContentLocatorBase : INotifyPropertyChanged2, IOwnedObject
    { 
        //-----------------------------------------------------
        //
        //  Constructors
        // 
        //-----------------------------------------------------
 
        #region Constructors 

        ///  
        ///     Internal constructor.  This makes the abstract class
        ///     unsubclassable by third-parties, as desired.
        /// 
        internal ContentLocatorBase() 
        {
        } 
 
        #endregion Constructors
 
        //------------------------------------------------------
        //
        //  Public Methods
        // 
        //-----------------------------------------------------
 
        #region Public Methods 

        ///  
        ///     Create a deep clone of this ContentLocatorBase.
        /// 
        /// a deep clone of this ContentLocatorBase; never returns null
        public abstract object Clone(); 

        #endregion Public Methods 
 
        //------------------------------------------------------
        // 
        //  Public Operators
        //
        //------------------------------------------------------
 
        //-----------------------------------------------------
        // 
        //  Public Events 
        //
        //------------------------------------------------------ 

        //-----------------------------------------------------
        //
        //  Public Properties 
        //
        //----------------------------------------------------- 
 
        //-----------------------------------------------------
        // 
        //  Internal Events
        //
        //------------------------------------------------------
 
        #region Public Events
 
        ///  
        ///
        ///  
        event PropertyChangedEventHandler INotifyPropertyChanged.PropertyChanged
        {
            add{ _propertyChanged += value; }
            remove{ _propertyChanged -= value; } 
        }
 
        #endregion Public Events 

        //----------------------------------------------------- 
        //
        //  Internal Methods
        //
        //------------------------------------------------------ 

        #region Internal Methods 
 
        /// 
        ///     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.
        ///  
        internal void FireLocatorChanged(string name)
        { 
            if (_propertyChanged != null) 
            {
                _propertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(name)); 
            }
        }

        ///  
        /// 
        bool IOwnedObject.Owned 
        { 
            get
            { 
                return _owned;
            }
            set
            { 
                _owned = value;
            } 
        } 

        ///  
        ///     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).
        ///  
        /// the ContentLocatorBase to merge 
        /// the resulting ContentLocatorBase (may be the same object the method
        /// was called on for perf reasons) 
        internal abstract ContentLocatorBase Merge(ContentLocatorBase other);

        #endregion Internal Methods
 
        //------------------------------------------------------
        // 
        //  Private Fields 
        //
        //----------------------------------------------------- 

        #region Private Fields

        ///  
        /// 
        private bool   _owned; 
 
        /// 
        /// 
        /// 
        private event PropertyChangedEventHandler _propertyChanged;

        #endregion Private Fields 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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LocatorBase.cs source code in C# .NET

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