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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
module AWS
class S3
class Tree
# Represents a branch in an {S3::Tree}. From a branch node you
# can descend deeper into the tree using {Parent#children} or go
# back to the parent node using {#parent}.
#
# When enumerating nodes in an S3 tree keys grouped by a common
# prefix are represented as a branch node.
#
# Branch nodes are often treated like directories.
#
# @see Tree
# @note Generally you do not need to create branch nodes.
class BranchNode < Node
include Parent
# @api private
def initialize parent, collection, options = {}
@parent = parent
super(collection,
options.merge(:prefix => collection.prefix))
end
# @return [Tree, BranchNode] The parent node in the tree.
attr_reader :parent
# @return [true]
def branch?
true
end
# @return [false]
def leaf?
false
end
# Returns a new Tree object that starts at this branch node.
# The returned tree will have the same prefix, delimiter and
# append mode as the tree the branch belongs to.
#
# @return [Tree]
def as_tree
Tree.new(collection,
:prefix => prefix,
:delimiter => delimiter,
:append => append?)
end
end
end
end
end
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