#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
# 
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license.  The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
# 
# Author: Enthought, Inc.
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------
""" A file system tree. """


# Standard library imports.
from os import listdir
from os.path import basename, isdir, isfile, join

# Enthought library imports.
from enthought.pyface.tree.api import NodeManager, NodeType


class FileNode(NodeType):
    """ Node type for files. """

    ###########################################################################
    # 'NodeType' interface.
    ###########################################################################

    def is_type_for(self, node):
        """ Returns True if this node type recognizes a node. """

        return isfile(node)

    def allows_children(self, node):
        """ Does the node allow children (ie. a folder vs a file). """

        return False
    
    def get_text(self, node):
        """ Returns the label text for a node. """

        return basename(node)


class FolderNode(NodeType):
    """ Node type for folders. """

    #########################################################################
    # 'NodeType' interface.
    #########################################################################

    def is_type_for(self, node):
        """ Returns True if this node type recognizes a node. """

        return isdir(node)

    def allows_children(self, node):
        """ Does the node allow children (ie. a folder vs a file). """

        return True

    def has_children(self, node):
        """ Returns True if a node has children, otherwise False. """

        return len(listdir(node)) > 0

    def get_children(self, node):
        """ Returns the children of a node. """

        return [join(node, filename) for filename in listdir(node)]

    def get_text(self, node):
        """ Returns the label text for a node. """

        return basename(node)

    
# Add all types to the node manager.
node_manager = NodeManager()
node_manager.add_node_type(FileNode())
node_manager.add_node_type(FolderNode())

##### EOF #####################################################################
