mongo-ruby-driver/lib/mongo/util/xml_to_ruby.rb

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# --
# Copyright (C) 2008-2009 10gen Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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.
# ++
require 'rexml/document'
require 'mongo'
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# Converts a .xson file (an XML file that describes a Mongo-type document) to
# an OrderedHash.
class XMLToRuby
include Mongo
def xml_to_ruby(io)
doc = REXML::Document.new(io)
doc_to_ruby(doc.root.elements['doc'])
end
protected
def element_to_ruby(e)
type = e.name
child = e.elements[1]
case type
when 'oid'
ObjectID.from_string(e.text)
when 'ref'
dbref_to_ruby(e.elements)
when 'int'
e.text.to_i
when 'number'
e.text.to_f
when 'string'
e.text.to_s
when 'code'
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Code.new(e.text.to_s)
when 'binary'
bin = Binary.new
decoded = Base64.decode64(e.text.to_s)
decoded.each_byte { |b| bin.put(b) }
bin
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when 'symbol'
e.text.to_s.intern
when 'boolean'
e.text.to_s == 'true'
when 'array'
array_to_ruby(e.elements)
when 'date'
Time.at(e.text.to_f / 1000.0)
when 'regex'
regex_to_ruby(e.elements)
when 'null'
nil
when 'doc'
doc_to_ruby(e)
else
raise "Unknown type #{type} in element with name #{e.attributes['name']}"
end
end
def doc_to_ruby(element)
oh = OrderedHash.new
element.elements.each { |e| oh[e.attributes['name']] = element_to_ruby(e) }
oh
end
def array_to_ruby(elements)
a = []
elements.each { |e|
index_str = e.attributes['name']
a[index_str.to_i] = element_to_ruby(e)
}
a
end
def regex_to_ruby(elements)
pattern = elements['pattern'].text
options_str = elements['options'].text || ''
options = 0
options |= Regexp::IGNORECASE if options_str.include?('i')
options |= Regexp::MULTILINE if options_str.include?('m')
options |= Regexp::EXTENDED if options_str.include?('x')
Regexp.new(pattern, options)
end
def dbref_to_ruby(elements)
ns = elements['ns'].text
oid_str = elements['oid'].text
DBRef.new(ns, ObjectID.from_string(oid_str))
end
end