#
# Copyright (c) 2006, John Mettraux, OpenWFE.org
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without 
# modification, are permitted provided that the following conditions are met:
# 
# . Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.  
# 
# . Redistributions in binary form must reproduce the above copyright notice, 
#   this list of conditions and the following disclaimer in the documentation 
#   and/or other materials provided with the distribution.
# 
# . Neither the name of the "OpenWFE" nor the names of its contributors may be
#   used to endorse or promote products derived from this software without
#   specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
# POSSIBILITY OF SUCH DAMAGE.
#
# $Id: definitions.rb 2725 2006-06-02 13:26:32Z jmettraux $
#

#
# "made in Japan"
#
# John Mettraux at openwfe.org
#

require 'rexml/document'

require 'otime'
require 'workitem'
require 'ru/engine'
require 'ru/rudefinitions'
require 'ru/flowexpression'
require 'ru/fe_base'


module OpenWFEru

    class RawExpression < FlowExpression

        attr_accessor \
            :xml_element

        def initialize \
            (fei, parent_id, environment_id, application_context, xml_element)

            super(fei, parent_id, environment_id, application_context, nil)

            @xml_element = xml_element

            new_environment() if not @environment_id
        end

        def apply (workitem)
            #ldebug { "apply() parent is #{@parent_id}" }

            attributes = extract_attributes()

            #ldebug { "apply() expression_name  is '#{expression_name()}'" }
            #ldebug { "apply() expression_class is '#{expression_class()}'" }

            template = lookup_variable(expression_name())

            if template and template.kind_of? OpenWFE::FlowExpressionId
                get_expression_pool().launch_template(\
                    self, 
                    template, 
                    workitem, 
                    lookup_attributes(attributes, workitem))
                return
            end

            eclass = expression_class()
            raise "unknown expression '#{expression_name}'" if not eclass

            expression = eclass.new(@fei, @parent_id, @environment_id, @application_context, attributes)
            expression.children = extract_children()

            expression.store_itself()

            expression.apply(workitem)
        end

        #def reply (workitem)
        #end

        def is_expression? ()
            return false if not @xml_element.kind_of?(REXML::XMLElement)
            return expression_class() != nil
        end

        def is_definition? ()
            return get_expression_map.is_definition?(expression_name())
        end

        def expression_name ()
            return @xml_element.name
        end

        def expression_class ()
            return get_expression_map().get_class(expression_name())
        end
        
        def definition_name ()
            #return @xml_element.attributes['name'].to_str
            return @xml_element.attributes['name'].to_s
        end

        protected

            def extract_attributes ()
                result = {}
                @xml_element.attributes.each_attribute do |a|
                    result[a.name] = a.value
                end
                return result
            end

            def extract_children ()

                c = []
                i = 0

                @xml_element.each_child do |elt|

                    if elt.kind_of?(REXML::Element)

                        cfei = @fei.dup
                        pfei = @fei

                        efei = @environment_id

                        cfei.expressionName = elt.name
                        cfei.expressionId = "#{cfei.expressionId}.#{i}"

                        rawchild = RawExpression\
                            .new(cfei, pfei, efei, @application_context, elt)

                        get_expression_pool().update(rawchild)
                        c << rawchild.fei

                        i = i+1

                    elsif elt.kind_of?(REXML::Comment)

                        next

                    else

                        s = elt.to_s.strip
                        c << s if s.length > 0

                    end
                end

                return c
            end
    end
end