SiteMapProvider.cs source code in C# .NET

                        Code:
                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / xsp / System / Web / SiteMapProvider.cs / 3 / SiteMapProvider.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * Copyright (c) 2002 Microsoft Corporation 
 */
namespace System.Web { 

    using System;
    using System.Collections;
    using System.Collections.Specialized; 
    using System.Configuration.Provider;
    using System.Web.Security; 
    using System.Web.UI; 
    using System.Web.Util;
    using System.Security.Permissions; 

    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public abstract class SiteMapProvider : ProviderBase { 

        private bool _securityTrimmingEnabled; 
        private bool _enableLocalization; 
        private String _resourceKey;
 
        internal const String _securityTrimmingEnabledAttrName = "securityTrimmingEnabled";
        private const string _allRoles = "*";

        private SiteMapProvider _rootProvider; 
        private SiteMapProvider _parentProvider;
        private object _resolutionTicket = new object(); 
 
        internal readonly object _lock = new Object();
 
        public virtual SiteMapNode CurrentNode {
            get {
                HttpContext context = HttpContext.Current;
                SiteMapNode result = null; 

                // First 
                result = ResolveSiteMapNode(context); 

                if (result == null) { 
                    result = FindSiteMapNode(context);
                }

                return ReturnNodeIfAccessible(result); 
            }
        } 
 
        public bool EnableLocalization {
            get { 
                return _enableLocalization;
            }
            set {
                _enableLocalization = value; 
            }
        } 
 
        // Parent provider
        public virtual SiteMapProvider ParentProvider { 
            get {
                return _parentProvider;
            }
            set { 
                _parentProvider = value;
            } 
        } 

        public string ResourceKey { 
            get {
                return _resourceKey;
            }
            set { 
                _resourceKey = value;
            } 
        } 

        public virtual SiteMapProvider RootProvider { 
            get {
                if (_rootProvider == null) {
                    lock (_lock) {
                        if (_rootProvider == null) { 
                            Hashtable providers = new Hashtable();
                            SiteMapProvider candidate = this; 
 
                            providers.Add(candidate, null);
                            while (candidate.ParentProvider != null) { 
                                if (providers.Contains(candidate.ParentProvider))
                                    throw new ProviderException(SR.GetString(SR.SiteMapProvider_Circular_Provider));

                                candidate = candidate.ParentProvider; 
                                providers.Add(candidate, null);
                            } 
 
                            _rootProvider = candidate;
                        } 
                    }
                }

                return _rootProvider; 
            }
        } 
 
        public virtual SiteMapNode RootNode {
            get { 
                SiteMapNode node = GetRootNodeCore();
                return ReturnNodeIfAccessible(node);
            }
        } 

        public bool SecurityTrimmingEnabled { 
            get { 
                return _securityTrimmingEnabled;
            } 
        }

        public event SiteMapResolveEventHandler SiteMapResolve;
 
        /// 
        ///    Add single node to provider. 
        ///  
        protected virtual void AddNode(SiteMapNode node) {
            AddNode(node, null); 
        }

        protected internal virtual void AddNode(SiteMapNode node, SiteMapNode parentNode) {
            throw new NotImplementedException(); 
        }
 
        public virtual SiteMapNode FindSiteMapNode(HttpContext context) { 
            if (context == null) {
                return null; 
            }

            string rawUrl = context.Request.RawUrl;
 
            SiteMapNode result = null;
 
            // First 
            result = FindSiteMapNode(rawUrl);
 
            if (result == null) {
                int queryStringIndex = rawUrl.IndexOf("?", StringComparison.Ordinal);
                if (queryStringIndex != -1) {
                    // 
                    result = FindSiteMapNode(rawUrl.Substring(0, queryStringIndex));
                } 
 
                if (result == null) {
                    Page page = context.CurrentHandler as Page; 
                    if (page != null) {
                        // Try without server side query strings
                        string qs = page.ClientQueryString;
                        if (qs.Length > 0) { 
                            result = FindSiteMapNode(context.Request.Path + "?" + qs);
                        } 
                    } 

                    if (result == null) { 
                        // Check the request path
                        result = FindSiteMapNode(context.Request.Path);
                    }
                } 
            }
 
            return result; 
        }
 
        public virtual SiteMapNode FindSiteMapNodeFromKey(string key) {
            return FindSiteMapNode(key);
        }
 
        public abstract SiteMapNode FindSiteMapNode(string rawUrl);
 
        public abstract SiteMapNodeCollection GetChildNodes(SiteMapNode node); 

        public virtual SiteMapNode GetCurrentNodeAndHintAncestorNodes(int upLevel) { 
            if (upLevel < -1) {
                throw new ArgumentOutOfRangeException("upLevel");
            }
 
            return CurrentNode;
        } 
 
        public virtual SiteMapNode GetCurrentNodeAndHintNeighborhoodNodes(int upLevel, int downLevel) {
            if (upLevel < -1) { 
                throw new ArgumentOutOfRangeException("upLevel");
            }

            if (downLevel < -1) { 
                throw new ArgumentOutOfRangeException("downLevel");
            } 
 
            return CurrentNode;
        } 

        public abstract SiteMapNode GetParentNode(SiteMapNode node);

        public virtual SiteMapNode GetParentNodeRelativeToCurrentNodeAndHintDownFromParent ( 
            int walkupLevels, int relativeDepthFromWalkup) {
 
            if (walkupLevels < 0) { 
                throw new ArgumentOutOfRangeException("walkupLevels");
            } 

            if (relativeDepthFromWalkup < 0) {
                throw new ArgumentOutOfRangeException("relativeDepthFromWalkup");
            } 

            // First get current nodes and hints about its ancestors. 
            SiteMapNode currentNode = GetCurrentNodeAndHintAncestorNodes(walkupLevels); 

            // Simply return if the currentNode is null. 
            if (currentNode == null) {
                return null;
            }
 
            // Find the target node by walk up the parent tree.
            SiteMapNode targetNode = GetParentNodesInternal(currentNode, walkupLevels); 
 
            if (targetNode == null) {
                return null; 
            }

            // Get hints about its lower neighborhood nodes.
            HintNeighborhoodNodes(targetNode, 0, relativeDepthFromWalkup); 

            return targetNode; 
        } 

        public virtual SiteMapNode GetParentNodeRelativeToNodeAndHintDownFromParent( 
            SiteMapNode node, int walkupLevels, int relativeDepthFromWalkup) {

            if (walkupLevels < 0) {
                throw new ArgumentOutOfRangeException("walkupLevels"); 
            }
 
            if (relativeDepthFromWalkup < 0) { 
                throw new ArgumentOutOfRangeException("relativeDepthFromWalkup");
            } 

            if (node == null) {
                throw new ArgumentNullException("node");
            } 

            // First get hints about ancestor nodes; 
            HintAncestorNodes(node, walkupLevels); 

            // walk up the parent node until the target node is found. 
            SiteMapNode ancestorNode = GetParentNodesInternal(node, walkupLevels);

            if (ancestorNode == null) {
                return null; 
            }
 
            // Get hints about its neighthood nodes 
            HintNeighborhoodNodes(ancestorNode, 0, relativeDepthFromWalkup);
 
            return ancestorNode;
        }

        private SiteMapNode GetParentNodesInternal(SiteMapNode node, int walkupLevels) { 
            Debug.Assert(node != null);
            if (walkupLevels <= 0) { 
                return node; 
            }
 
            do {
                node = node.ParentNode;
                walkupLevels--;
            } while (node != null && walkupLevels != 0); 

            return node; 
        } 

        /* 
         * A reference node that must be returned by all sitemap providers, this is
         * required for the parent provider to keep track of the relations between
         * two providers.
         * For example, the parent provider uses this method to keep track of the parent 
         * node of child provider's root node.
         */ 
        protected internal abstract SiteMapNode GetRootNodeCore(); 

        protected static SiteMapNode GetRootNodeCoreFromProvider(SiteMapProvider provider) { 
            return provider.GetRootNodeCore();
        }

        public virtual void HintAncestorNodes(SiteMapNode node, int upLevel) { 
            if (node == null) {
                throw new ArgumentNullException("node"); 
            } 

            if (upLevel < -1) { 
                throw new ArgumentOutOfRangeException("upLevel");
            }
        }
 
        public virtual void HintNeighborhoodNodes(SiteMapNode node, int upLevel, int downLevel) {
            if (node == null) { 
                throw new ArgumentNullException("node"); 
            }
 
            if (upLevel < -1) {
                throw new ArgumentOutOfRangeException("upLevel");
            }
 
            if (downLevel < -1) {
                throw new ArgumentOutOfRangeException("downLevel"); 
            } 
        }
 
        public override void Initialize(string name, NameValueCollection attributes) {
            if (attributes != null) {
                if (string.IsNullOrEmpty(attributes["description"])) {
                    attributes.Remove("description"); 
                    attributes.Add("description", this.GetType().Name);
                } 
 
                ProviderUtil.GetAndRemoveBooleanAttribute(attributes, _securityTrimmingEnabledAttrName, Name, ref _securityTrimmingEnabled);
            } 

            base.Initialize(name, attributes);
        }
 
        public virtual bool IsAccessibleToUser(HttpContext context, SiteMapNode node) {
            if (node == null) { 
                throw new ArgumentNullException("node"); 
            }
 
            if (context == null) {
                throw new ArgumentNullException("context");
            }
 
            if (!SecurityTrimmingEnabled) {
                return true; 
            } 

            if (node.Roles != null) { 
                foreach (string role in node.Roles) {
                    // Grant access if one of the roles is a "*".
                    if (role == _allRoles ||
                        context.User != null && context.User.IsInRole(role)) { 
                        return true;
                    } 
                } 
            }
 
            VirtualPath virtualPath = node.VirtualPath;
            if (virtualPath == null ||
                !virtualPath.IsWithinAppRoot) {
 
                return false;
            } 
 
            return System.Web.UI.Util.IsUserAllowedToPath(context, virtualPath);
        } 

        protected internal virtual void RemoveNode(SiteMapNode node) {
            throw new NotImplementedException();
        } 

        protected SiteMapNode ResolveSiteMapNode(HttpContext context) { 
            SiteMapResolveEventHandler eventHandler = SiteMapResolve; 
            if (eventHandler == null)
                return null; 

            if (!context.Items.Contains(_resolutionTicket)) {
                context.Items.Add(_resolutionTicket, true);
 
                try {
                    Delegate[] ds = eventHandler.GetInvocationList(); 
                    int len = ds.Length; 
                    for (int i = 0; i < len; i++) {
                        SiteMapNode ret = ((SiteMapResolveEventHandler)ds[i])(this, new SiteMapResolveEventArgs(context, this)); 
                        if (ret != null) {
                            return ret;
                        }
                    } 
                } finally {
                    context.Items.Remove(_resolutionTicket); 
                } 
            }
 

            return null;
        }
 
        internal SiteMapNode ReturnNodeIfAccessible(SiteMapNode node) {
            if (node != null && node.IsAccessibleToUser(HttpContext.Current)) { 
                return node; 
            }
 
            return null;
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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