XmlNamespaceMapping.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Data / XmlNamespaceMapping.cs / 1305600 / XmlNamespaceMapping.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: Implementation of XmlNamespaceMapping object. 
// 
// Specs:       http://avalon/connecteddata/M5%20Specs/XmlDataSource.mht
//              http://avalon/connecteddata/M5%20Specs/WCP%20DataSources.mht 
//
//---------------------------------------------------------------------------

using System; 
using System.ComponentModel;        // ISupportInitialize
 
namespace System.Windows.Data 
{
    ///  
    /// XmlNamespaceMapping Class
    /// used for declaring Xml Namespace Mappings
    /// 
    public class XmlNamespaceMapping : ISupportInitialize 
    {
        ///  
        /// Constructor for XmlNamespaceMapping 
        /// 
        public XmlNamespaceMapping() 
        {
        }

        ///  
        /// Constructor for XmlNamespaceMapping
        ///  
        public XmlNamespaceMapping(string prefix, Uri uri) 
        {
            _prefix = prefix; 
            _uri = uri;
        }

        ///  
        /// The prefix to be used for this Namespace
        ///  
        public string Prefix 
        {
            get { return _prefix; } 
            set
            {
                if (!_initializing)
                    throw new InvalidOperationException(SR.Get(SRID.PropertyIsInitializeOnly, "Prefix", this.GetType().Name)); 
                if (_prefix != null && _prefix != value)
                    throw new InvalidOperationException(SR.Get(SRID.PropertyIsImmutable, "Prefix", this.GetType().Name)); 
 
                _prefix = value;
            } 
        }

        /// 
        /// The Uri to be used for this Namespace, 
        /// can be declared as an attribute or as the
        /// TextContent of the XmlNamespaceMapping markup tag 
        ///  
        public Uri Uri
        { 
            get { return _uri; }
            set
            {
                if (!_initializing) 
                    throw new InvalidOperationException(SR.Get(SRID.PropertyIsInitializeOnly, "Uri", this.GetType().Name));
                if (_uri != null && _uri != value) 
                    throw new InvalidOperationException(SR.Get(SRID.PropertyIsImmutable, "Uri", this.GetType().Name)); 

                _uri = value; 
            }
        }

        ///  
        /// Equality comparison by value
        ///  
        public override bool Equals(object obj) 
        {
            return (this == (obj as XmlNamespaceMapping));  // call the == operator override 
        }

        /// 
        /// Equality comparison by value 
        /// 
        public static bool operator == (XmlNamespaceMapping mappingA, XmlNamespaceMapping mappingB) 
        { 
            // cannot just compare with (mappingX == null), it'll cause recursion and stack overflow!
            if (object.ReferenceEquals(mappingA, null)) 
                return object.ReferenceEquals(mappingB, null);
            if (object.ReferenceEquals(mappingB, null))
                return false;
 
#pragma warning disable 1634, 1691
 
            // presharp false positive for null-checking on mappings 
            #pragma warning suppress 56506
            return ((mappingA.Prefix == mappingB.Prefix) && (mappingA.Uri == mappingB.Uri)) ; 

#pragma warning restore 1634, 1691
        }
 
        /// 
        /// Inequality comparison by value 
        ///  
        public static bool operator != (XmlNamespaceMapping mappingA, XmlNamespaceMapping mappingB)
        { 
            return !(mappingA == mappingB);
        }

        ///  
        /// Hash function for this type
        ///  
        public override int GetHashCode() 
        {
            // note that the hash code can change, but only during intialization 
            // (_prefix and _uri can only be changed once, from null to
            // non-null, and only during [Begin/End]Init). Technically this is
            // still a violation of the "constant during lifetime" rule, however
            // in practice this is acceptable.   It is very unlikely that someone 
            // will put an XmlNamespaceMapping into a hashtable before it is initialized.
 
            int hash = 0; 
            if (_prefix != null)
                hash = _prefix.GetHashCode(); 
            if (_uri != null)
                return unchecked(hash + _uri.GetHashCode());
            else
                return hash; 
        }
 
#region ISupportInitialize 

        /// Begin Initialization 
        void ISupportInitialize.BeginInit()
        {
            _initializing = true;
        } 

        /// End Initialization, verify that internal state is consistent 
        void ISupportInitialize.EndInit() 
        {
            if (_prefix == null) 
            {
                throw new InvalidOperationException(SR.Get(SRID.PropertyMustHaveValue, "Prefix", this.GetType().Name));
            }
            if (_uri == null) 
            {
                throw new InvalidOperationException(SR.Get(SRID.PropertyMustHaveValue, "Uri", this.GetType().Name)); 
            } 

            _initializing = false; 
        }

#endregion ISupportInitialize
 
        private string _prefix;
        private Uri _uri; 
        private bool _initializing; 
    }
} 

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

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