XPathNavigatorKeyComparer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / XPath / XPathNavigatorKeyComparer.cs / 1305376 / XPathNavigatorKeyComparer.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
using System.IO; 
using System.Xml.Schema;
using System.Collections; 
using System.Diagnostics;
using MS.Internal.Xml.Cache;

namespace System.Xml.XPath { 
    internal class XPathNavigatorKeyComparer : IEqualityComparer {
        bool IEqualityComparer.Equals( Object obj1, Object obj2 ) { 
            XPathNavigator nav1 = obj1 as XPathNavigator; 
            XPathNavigator nav2 = obj2 as XPathNavigator;
            if( ( nav1 != null ) && ( nav2 != null ) ) { 
                if( nav1.IsSamePosition( nav2 ) )
                    return true;
            }
            return false; 
        }
 
        int IEqualityComparer.GetHashCode ( Object obj ) { 
            int hashCode;
            XPathNavigator nav; 
            XPathDocumentNavigator xpdocNav;

            if (obj == null) {
                throw new ArgumentNullException("obj"); 
            }
            else if ( null != (xpdocNav = obj as XPathDocumentNavigator) ) { 
                hashCode = xpdocNav.GetPositionHashCode(); 
            }
            else if( null != (nav = obj as XPathNavigator) ) { 
                Object underlyingObject = nav.UnderlyingObject;
                if (underlyingObject != null) {
                    hashCode = underlyingObject.GetHashCode();
                } 
                else {
                    hashCode = (int)nav.NodeType; 
                    hashCode ^= nav.LocalName.GetHashCode(); 
                    hashCode ^= nav.Prefix.GetHashCode();
                    hashCode ^= nav.NamespaceURI.GetHashCode(); 
                }
            }
            else {
                hashCode = obj.GetHashCode(); 
            }
            return hashCode; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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