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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
class ChildCollection
include Core::Model
include Enumerable
# @api private
def initialize parent, collection, options = {}
options = {
:prefix => nil,
:delimiter => '/',
:append => true,
}.merge(options)
@parent = parent
@collection = collection
@prefix = options[:prefix]
@delimiter = options[:delimiter]
@append = options[:append]
super
end
# @return [Tree, BranchNode] The parent node in the tree.
attr_reader :parent
# @return [ObjectCollection, ObjectVersionCollection,
# MultipartUploadCollection] Returns the collection this
# tree is based on.
attr_reader :collection
# A tree may have a prefix of where in the bucket to be based from.
# @return [String,nil]
attr_reader :prefix
# When looking at S3 keys as a tree, the delimiter defines what
# string pattern seperates each level of the tree. The delimiter
# defaults to '/' (like in a file system).
# @return [String]
attr_reader :delimiter
# @return [Boolean] Returns true if the tree is set to auto-append
# the delimiter to the prefix when the prefix does not end with
# the delimiter.
def append?
@append
end
# Yields up branches and leaves.
#
# A branch node represents a common prefix (like a directory)
# and a leaf node represents a key (S3 object).
#
# @yield [tree_node] Yields up a mixture of branches and leafs.
# @yieldparam [BranchNode,LeafNode] tree_node A branch or a leaf.
# @return [nil]
def each &block
collection = self.collection
if prefix = prefix_with_delim
collection = collection.with_prefix(prefix)
end
collection.each(:delimiter => delimiter) do |member|
case
when member.respond_to?(:key)
yield LeafNode.new(parent, member)
when member.respond_to?(:prefix)
yield BranchNode.new(parent, member,
:delimiter => delimiter,
:append => append?)
end
end
nil
end
protected
def prefix_with_delim
return prefix unless append?
return nil if prefix.nil?
prefix =~ /#{delimiter}$/ ? prefix : "#{prefix}#{delimiter}"
end
end
end
end
end
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