--- /dev/null
+raise "JRuby is required to use the JDOM backend for XmlMini" unless RUBY_PLATFORM =~ /java/
+
+require 'jruby'
+include Java
+
+import javax.xml.parsers.DocumentBuilder unless defined? DocumentBuilder
+import javax.xml.parsers.DocumentBuilderFactory unless defined? DocumentBuilderFactory
+import java.io.StringReader unless defined? StringReader
+import org.xml.sax.InputSource unless defined? InputSource
+import org.xml.sax.Attributes unless defined? Attributes
+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 into a simple hash using Java's jdom.
+ # string::
+ # XML Document string to parse
+ def parse(string)
+ if string.blank?
+ {}
+ else
+ @dbf = DocumentBuilderFactory.new_instance
+ xml_string_reader = StringReader.new(string)
+ xml_input_source = InputSource.new(xml_string_reader)
+ doc = @dbf.new_document_builder.parse(xml_input_source)
+ merge_element!({}, 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)
+ merge!(hash, element.tag_name, collapse(element))
+ 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
+ for i in 0...child_nodes.length
+ 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 emement to.
+ # element::
+ # XML element whose texts are to me merged into the hash
+ def merge_texts!(hash, element)
+ 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
+ for i in 0...attributes.length
+ 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
+ for i in 0...child_nodes.length
+ 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
+ for i in 0...child_nodes.length
+ 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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