Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / Utils / TreePrinter.cs / 1305376 / TreePrinter.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Diagnostics; using System.Globalization; using System.Text; namespace System.Data.Common.Utils { ////// Represents a node in a hierarchical collection of information strings. /// Intended as a common way mechanism to represent tree structures for debugging (using the TreePrinter class). /// A node consists of a string (represented as a StringBuilder), its collection of child nodes, and an optional Tag value. /// internal class TreeNode { private StringBuilder _text; private List_children = new List (); private int _position; // Default constructor internal TreeNode() { _text = new StringBuilder(); } /// /// Constructs a new TreeNode with the specified text, tag value and child nodes /// /// The initial value of the new node's text /// An optional list of initial child nodes internal TreeNode(string text, params TreeNode[] children) { if (string.IsNullOrEmpty(text)) { _text = new StringBuilder(); } else { _text = new StringBuilder(text); } if (children != null) { _children.AddRange(children); } } // IEnumerable convenience constructors internal TreeNode(string text, Listchildren) : this(text) { if (children != null) { _children.AddRange(children); } } // 'public' properties /// /// The current text of this node. /// internal StringBuilder Text { get { return _text; } } ////// The collection of child nodes for this node, which may be empty. /// internal IListChildren { get { return _children; } } // Used only by the TreePrinter when generating the output string internal int Position { get { return _position; } set { _position = value; } } } /// /// Generates a formatted string from a hierarchy of tree nodes. Derived types may override /// the PreProcess, Before/AfterAppend, Print, PrintNode and PrintChildren methods to add /// specific functionality at particular points in process of building the string. /// internal abstract class TreePrinter { #region Private Instance Members private List_scopes = new List (); private bool _showLines = true; private char _horizontals = '_'; private char _verticals = '|'; #endregion #region 'Public' API /// /// Entry point method for the TreePrinter /// /// The TreeNode instance that is the root of the tree to be printed ///A string representation of the specified tree internal virtual string Print(TreeNode node) { this.PreProcess(node); StringBuilder text = new StringBuilder(); PrintNode(text, node); return text.ToString(); } #endregion #region 'Protected' API // 'protected' constructor internal TreePrinter() { } // 'protected' API that may be overriden to customize printing ////// Called once on the root of the tree before printing begins /// /// The TreeNode that is the root of the tree internal virtual void PreProcess(TreeNode node) { } ////// Called once for every node after indentation, connecting lines and the node's text value /// have been added to the output but before the line suffix (if any) has been added. /// /// The current node /// The StringBuilder into which the tree is being printed internal virtual void AfterAppend(TreeNode node, StringBuilder text) { } ////// Called once for every node immediately after the line prefix (if any) and appropriate /// indentation and connecting lines have been added to the output but before the node's /// text value has been added. /// /// The current node /// The StringBuilder into which the tree is being printed internal virtual void BeforeAppend(TreeNode node, StringBuilder text) { } ////// The recursive step of the printing process, called once for each TreeNode in the tree /// /// The StringBuilder into which the tree is being printed /// The current node that should be printed to the StringBuilder internal virtual void PrintNode(StringBuilder text, TreeNode node) { IndentLine(text); this.BeforeAppend(node, text); text.Append(node.Text.ToString()); this.AfterAppend(node, text); PrintChildren(text, node); } ////// Called to recursively visit the child nodes of the current TreeNode. /// /// The StringBuilder into which the tree is being printed /// The current node internal virtual void PrintChildren(StringBuilder text, TreeNode node) { _scopes.Add(node); node.Position = 0; foreach (TreeNode childNode in node.Children) { text.AppendLine(); node.Position++; PrintNode(text, childNode); } _scopes.RemoveAt(_scopes.Count - 1); } #endregion #region Private Implementation private void IndentLine(StringBuilder text) { int idx = 0; for (int scopeIdx = 0; scopeIdx < _scopes.Count; scopeIdx++) { TreeNode parentScope = _scopes[scopeIdx]; if (!_showLines || (parentScope.Position == parentScope.Children.Count && scopeIdx != _scopes.Count - 1)) { text.Append(' '); } else { text.Append(_verticals); } idx++; if (_scopes.Count == idx && _showLines) { text.Append(_horizontals); } else { text.Append(' '); } } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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