Gets the common root path of the given path list. : Path « File Stream « C# / C Sharp






  1. C# / C Sharp
  2. File Stream
  3. Path

Gets the common root path of the given path list.

      
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace StyleCopContrib.Runner
{
  /// <summary>
  /// A path utility class.
  /// </summary>
  public static class PathUtility
  {
    #region Methods

    /// <summary>
    /// Gets the common root path of the given path list.
    /// </summary>
    /// <param name="paths">The list of path.</param>
    /// <returns>The common root path.</returns>
    public static string GetCommonRootPath(IEnumerable<string> paths)
    {
      string[] commonPathParts = null;
      int commonPartIndex = int.MaxValue;

      foreach (string path in paths)
      {
        if (!Path.IsPathRooted(path))
        {
          throw new InvalidOperationException("Only fully qualified path are supported");
        }

        string[] pathParts = path.Split(Path.DirectorySeparatorChar);

        if (commonPathParts == null)
        {
          commonPathParts = pathParts;
          commonPartIndex = commonPathParts.Length;
        }
        else
        {
          int partIndex = 0;
          while (partIndex < pathParts.Length && partIndex < commonPathParts.Length)
          {
            if (commonPathParts[partIndex].ToUpperInvariant() != pathParts[partIndex].ToUpperInvariant()) break;

            partIndex++;
          }

          commonPartIndex = Math.Min(commonPartIndex, partIndex);
        }
      }

      string commonPath;
      if (commonPartIndex == 0)
      {
        commonPath = string.Empty;
      }
      else if (commonPartIndex == 1)
      {
        commonPath = string.Concat(commonPathParts[0], Path.DirectorySeparatorChar);
      }
      else
      {
        commonPath = string.Join(Path.DirectorySeparatorChar.ToString(), commonPathParts, 0, commonPartIndex);
      }

      return commonPath;
    }


    #endregion
  }
}








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