public void GetParentPathTests()
{
Assert.Null(ConfigurationPath.GetParentPath(null));
Assert.Null(ConfigurationPath.GetParentPath(""));
Assert.Equal("::", ConfigurationPath.GetParentPath(":::"));
Assert.Equal("a::b::", ConfigurationPath.GetParentPath("a::b:::c"));
Assert.Equal("a:::b", ConfigurationPath.GetParentPath("a:::b:"));
Assert.Null(ConfigurationPath.GetParentPath("key"));
Assert.Equal("", ConfigurationPath.GetParentPath(":key"));
Assert.Equal(":", ConfigurationPath.GetParentPath("::key"));
Assert.Equal("parent", ConfigurationPath.GetParentPath("parent:key"));
}
} /* End of Function - CreateXmlWriter */
/*----------------------- GetXmlItem ------------------------------------*/
/// <summary>
/// Gets an <see cref="XmlItem"/> for the specified configuraion path/value.
/// </summary>
/// <param name="root">
/// Required root item to search in
/// </param>
/// <param name="path">
/// Path as defined by <see cref="ConfigurationPath"/> syntax.
/// </param>
/// <param name="value">
/// Optional value for the item.
/// </param>
protected virtual XmlItem GetXmlItem(
ref XmlItem root,
string path,
string value)
{
XmlItem retval = null;
XmlItem parent = null;
if (string.IsNullOrEmpty(path))
{
throw new InvalidOperationException(
$"{nameof(path)} must be a valid configuraiton path.");
}
// Parse the parent path from the key, if any
var parentPath = ConfigurationPath.GetParentPath(path);
// And get the current key
var key = ConfigurationPath.GetSectionKey(path);
// If we do not have a parent, then we will assume the root item as our
// parent.
if (null == parentPath)
{
parent = root;
}
// Otherwise, fetch the parent XML node
else
{
parent = GetXmlItem(ref root, parentPath, null);
}
// At this point, we can look for a child in the parent that already
// matches our key
retval = parent.Children.Where(v => v.Name == key).SingleOrDefault();
// If we didn't find one, will create and add to the parent's
// children.
if (null == retval)
{
retval = new XmlItem(key, value, parent);
parent.Children.Add(retval);
} // end of if - child doesn't exist yet
// Otherwise, if we have a valid value, then we will update at this point
else if (null != value)
{
retval.Value = value;
}
return(retval);
} /* End of Function - GetXmlItem */