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raise "JRuby is required to use the JDOM backend for XmlMini" unless RUBY_PLATFORM =~ /java/
require 'jruby'
include Java
require 'active_support/core_ext/object/blank'
java_import javax.xml.parsers.DocumentBuilder unless defined? DocumentBuilder
java_import javax.xml.parsers.DocumentBuilderFactory unless defined? DocumentBuilderFactory
java_import java.io.StringReader unless defined? StringReader
java_import org.xml.sax.InputSource unless defined? InputSource
java_import org.xml.sax.Attributes unless defined? Attributes
java_import org.w3c.dom.Node unless defined? Node
# = XmlMini JRuby JDOM implementation
module ActiveSupport
module XmlMini_JDOM #:nodoc:
extend self
CONTENT_KEY = '__content__'.freeze
NODE_TYPE_NAMES = %w{ATTRIBUTE_NODE CDATA_SECTION_NODE COMMENT_NODE DOCUMENT_FRAGMENT_NODE
DOCUMENT_NODE DOCUMENT_TYPE_NODE ELEMENT_NODE ENTITY_NODE ENTITY_REFERENCE_NODE NOTATION_NODE
PROCESSING_INSTRUCTION_NODE TEXT_NODE}
node_type_map = {}
NODE_TYPE_NAMES.each { |type| node_type_map[Node.send(type)] = type }
# Parse an XML Document string or IO into a simple hash using Java's jdom.
# data::
# XML Document string or IO to parse
def parse(data)
if data.respond_to?(:read)
data = data.read
end
if data.blank?
{}
else
@dbf = DocumentBuilderFactory.new_instance
xml_string_reader = StringReader.new(data)
xml_input_source = InputSource.new(xml_string_reader)
doc = @dbf.new_document_builder.parse(xml_input_source)
merge_element!({CONTENT_KEY => ''}, doc.document_element)
end
end
private
# Convert an XML element and merge into the hash
#
# hash::
# Hash to merge the converted element into.
# element::
# XML element to merge into hash
def merge_element!(hash, element)
delete_empty(hash)
merge!(hash, element.tag_name, collapse(element))
end
def delete_empty(hash)
hash.delete(CONTENT_KEY) if hash[CONTENT_KEY] == ''
end
# Actually converts an XML document element into a data structure.
#
# element::
# The document element to be collapsed.
def collapse(element)
hash = get_attributes(element)
child_nodes = element.child_nodes
if child_nodes.length > 0
(0...child_nodes.length).each do |i|
child = child_nodes.item(i)
merge_element!(hash, child) unless child.node_type == Node.TEXT_NODE
end
merge_texts!(hash, element) unless empty_content?(element)
hash
else
merge_texts!(hash, element)
end
end
# Merge all the texts of an element into the hash
#
# hash::
# Hash to add the converted element to.
# element::
# XML element whose texts are to me merged into the hash
def merge_texts!(hash, element)
delete_empty(hash)
text_children = texts(element)
if text_children.join.empty?
hash
else
# must use value to prevent double-escaping
merge!(hash, CONTENT_KEY, text_children.join)
end
end
# Adds a new key/value pair to an existing Hash. If the key to be added
# already exists and the existing value associated with key is not
# an Array, it will be wrapped in an Array. Then the new value is
# appended to that Array.
#
# hash::
# Hash to add key/value pair to.
# key::
# Key to be added.
# value::
# Value to be associated with key.
def merge!(hash, key, value)
if hash.has_key?(key)
if hash[key].instance_of?(Array)
hash[key] << value
else
hash[key] = [hash[key], value]
end
elsif value.instance_of?(Array)
hash[key] = [value]
else
hash[key] = value
end
hash
end
# Converts the attributes array of an XML element into a hash.
# Returns an empty Hash if node has no attributes.
#
# element::
# XML element to extract attributes from.
def get_attributes(element)
attribute_hash = {}
attributes = element.attributes
(0...attributes.length).each do |i|
attribute_hash[CONTENT_KEY] ||= ''
attribute_hash[attributes.item(i).name] = attributes.item(i).value
end
attribute_hash
end
# Determines if a document element has text content
#
# element::
# XML element to be checked.
def texts(element)
texts = []
child_nodes = element.child_nodes
(0...child_nodes.length).each do |i|
item = child_nodes.item(i)
if item.node_type == Node.TEXT_NODE
texts << item.get_data
end
end
texts
end
# Determines if a document element has text content
#
# element::
# XML element to be checked.
def empty_content?(element)
text = ''
child_nodes = element.child_nodes
(0...child_nodes.length).each do |i|
item = child_nodes.item(i)
if item.node_type == Node.TEXT_NODE
text << item.get_data.strip
end
end
text.strip.length == 0
end
end
end
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