Why Comments Are Stupid, a Real Example 4

why-comments-are-stupid-4.cs

public class DirectoryFileSplitter
{
    private readonly string validatedFullPath;
    private int length;
    private int rootLength;
    private bool pivotFound;
    public string Directory { get; set; }
    public string File { get; set; }

    public DirectoryFileSplitter(string validatedFullPath)
    {
        this.validatedFullPath = validatedFullPath;
        length = validatedFullPath.Length;
        rootLength = GetRootLength(validatedFullPath);
    }

    public void Split()
    {
        if (validatedFullPath != null)
        {
            IgnoreTrailingSlash();

            FindPivotIndexBetweenEndOfStringAndRoot();

            // no pivot, return just the trimmed directory
            if(!pivotFound)
                Directory = validatedFullPath.Substring(0, length);
        }

        return;
    }

    private void FindPivotIndexBetweenEndOfStringAndRoot()
    {
        for (int pivot = length - 1; pivot >= rootLength; pivot--)
        {
            if (IsDirectorySeparator(validatedFullPath[pivot]))
            {
                Directory = validatedFullPath.Substring(0, pivot);
                File = validatedFullPath.Substring(pivot + 1, length - pivot - 1);
                pivotFound = true;
            }
        }
    }

    private void IgnoreTrailingSlash()
    {
        if (length > rootLength && EndsInDirectorySeparator(validatedFullPath))
            length--;
    }
}