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require 'rgen/ecore/ecore'
require 'rgen/instantiator/abstract_xml_instantiator'
require 'rgen/array_extensions'
class ECoreXMLInstantiator < AbstractXMLInstantiator
include RGen::ECore
INFO = 0
WARN = 1
ERROR = 2
def initialize(env, loglevel=ERROR)
@env = env
@rolestack = []
@elementstack = []
@element_by_id = {}
@loglevel = loglevel
end
def start_tag(prefix, tag, namespaces, attributes)
eRef = nil
if @elementstack.last
eRef = eAllReferences(@elementstack.last).find{|r|r.name == tag}
if eRef
if attributes["xsi:type"] && attributes["xsi:type"] =~ /ecore:(\w+)/
class_name = $1
attributes.delete("xsi:type")
else
class_name = eRef.eType.name
end
else
raise "Reference not found: #{tag} on #{@elementstack.last}"
end
else
class_name = tag
end
eClass = RGen::ECore.ecore.eClassifiers.find{|c| c.name == class_name}
if eClass
obj = RGen::ECore.const_get(class_name).new
if attributes["xmi:id"]
@element_by_id[attributes["xmi:id"]] = obj
attributes.delete("xmi:id")
end
if eRef
if eRef.many
@elementstack.last.addGeneric(eRef.name, obj)
else
@elementstack.last.setGeneric(eRef.name, obj)
end
end
@env << obj
@elementstack.push obj
else
log WARN, "Class not found: #{class_name}"
@elementstack.push nil
end
attributes.each_pair do |attr, value|
set_attribute_internal(attr, value)
end
end
def end_tag(prefix, tag)
@elementstack.pop
end
ResolverDescription = Struct.new(:object, :attribute, :value)
def set_attribute(attr, value)
# do nothing, already handled by start_tag/set_attribute_internal
end
def set_attribute_internal(attr, value)
return unless @elementstack.last
eFeat = eAllStructuralFeatures(@elementstack.last).find{|a| a.name == attr}
if eFeat.is_a?(EReference)
rd = ResolverDescription.new
rd.object = @elementstack.last
rd.attribute = attr
rd.value = value
@resolver_descs << rd
elsif eFeat
value = true if value == "true" && eFeat.eType == EBoolean
value = false if value == "false" && eFeat.eType == EBoolean
value = value.to_i if eFeat.eType == EInt || eFeat.eType == ELong
@elementstack.last.setGeneric(attr, value)
else
log WARN, "Feature not found: #{attr} on #{@elementstack.last}"
end
end
def instantiate(str)
@resolver_descs = []
# puts "Instantiating ..."
super(str, 1000)
rootpackage = @env.find(:class => EPackage).first
# puts "Resolving ..."
@resolver_descs.each do |rd|
refed = find_referenced(rootpackage, rd.value)
feature = eAllStructuralFeatures(rd.object).find{|f| f.name == rd.attribute}
raise StandardError.new("StructuralFeature not found: #{rd.attribute}") unless feature
if feature.many
rd.object.setGeneric(feature.name, refed)
else
rd.object.setGeneric(feature.name, refed.first)
end
end
end
def eAllReferences(element)
@eAllReferences ||= {}
@eAllReferences[element.class] ||= element.class.ecore.eAllReferences
end
def eAllAttributes(element)
@eAllAttributes ||= {}
@eAllAttributes[element.class] ||= element.class.ecore.eAllAttributes
end
def eAllStructuralFeatures(element)
@eAllStructuralFeatures ||= {}
@eAllStructuralFeatures[element.class] ||= element.class.ecore.eAllStructuralFeatures
end
def find_referenced(context, desc)
desc.split(/\s+/).collect do |r|
if r =~ /^#([^\/]+)$/
@element_by_id[$1]
elsif r =~ /^#\/\d*\/([\w\/]+)/
find_in_context(context, $1.split('/'))
elsif r =~ /#\/\/(\w+)$/
case $1
when "EString"; RGen::ECore::EString
when "EInt"; RGen::ECore::EInt
when "ELong"; RGen::ECore::ELong
when "EBoolean"; RGen::ECore::EBoolean
when "EFloat"; RGen::ECore::EFloat
when "EJavaObject"; RGen::ECore::EJavaObject
when "EJavaClass"; RGen::ECore::EJavaClass
end
end
end.compact
end
def find_in_context(context, desc_elements)
if context.is_a?(EPackage)
r = (context.eClassifiers + context.eSubpackages).find{|c| c.name == desc_elements.first}
elsif context.is_a?(EClass)
r = context.eStructuralFeatures.find{|s| s.name == desc_elements.first}
else
raise StandardError.new("Don't know how to find #{desc_elements.join('/')} in context #{context}")
end
if r
if desc_elements.size > 1
find_in_context(r, desc_elements[1..-1])
else
r
end
else
log WARN, "Can not follow path, element #{desc_elements.first} not found within #{context}(#{context.name})"
end
end
def log(level, msg)
puts %w(INFO WARN ERROR)[level] + ": " + msg if level >= @loglevel
end
end
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