simplify grabbing of a xml base doc

[rails.git] / app / models / segment.rb

diff --git a/app/models/segment.rb b/app/models/segment.rb
index 6e52a73ab557aeafd01957e6db834592f9fec2b9..5c3c65e34ba190fd44769e9de1be211034515610 100644 (file)
--- a/app/models/segment.rb
+++ b/app/models/segment.rb
@@ -1,2 +1,107 @@
 class Segment < ActiveRecord::Base
+  require 'xml/libxml'
+  set_table_name 'current_segments'
+
+  validates_numericality_of :node_a
+  validates_numericality_of :node_b
+
+  has_many :old_segments, :foreign_key => :id
+  belongs_to :user
+
+  # using belongs_to :foreign_key = 'node_*', since if use has_one :foreign_key = 'id', segment preconditions? fails checking for segment id in node table
+  belongs_to :from_node, :class_name => 'Node', :foreign_key => 'node_a'
+  belongs_to :to_node, :class_name => 'Node', :foreign_key => 'node_b'
+
+  def self.from_xml(xml, create=false)
+    p = XML::Parser.new
+    p.string = xml
+    doc = p.parse
+
+    segment = Segment.new
+
+    doc.find('//osm/segment').each do |pt|
+
+      segment.node_a = pt['from'].to_i
+      segment.node_b = pt['to'].to_i
+
+      if pt['id'] != '0'
+        segment.id = pt['id'].to_i
+      end
+
+      segment.visible = true
+
+      if create
+        segment.timestamp = Time.now
+      else
+        if pt['timestamp']
+          segment.timestamp = Time.parse(pt['timestamp'])
+        end
+      end
+
+      tags = []
+
+      pt.find('tag').each do |tag|
+        tags << [tag['k'],tag['v']]
+      end
+
+      tags = tags.collect { |k,v| "#{k}=#{v}" }.join(';')
+      tags = '' if tags.nil?
+
+      segment.tags = tags
+
+    end
+    return segment
+  end
+
+  def save_with_history
+    begin
+      Segment.transaction do
+        self.save
+        old_segment = OldSegment.from_segment(self)
+        old_segment.save
+      end
+      return true
+    rescue Exception => ex
+      return nil
+    end
+  end
+
+  def to_xml
+    doc = OSM::API.new.get_xml_doc
+    doc.root << to_xml_node()
+    return doc
+  end
+
+  def to_xml_node
+    el1 = XML::Node.new 'segment'
+    el1['id'] = self.id.to_s
+    el1['from'] = self.node_a.to_s
+    el1['to'] = self.node_b.to_s
+    el1['user'] = self.user.display_name if self.user.data_public?
+    Segment.split_tags(el1, self.tags)
+    el1['visible'] = self.visible.to_s
+    el1['timestamp'] = self.timestamp.xmlschema
+    return el1
+  end
+
+  def self.split_tags(el, tags)
+    tags.split(';').each do |tag|
+      parts = tag.split('=')
+      key = ''
+      val = ''
+      key = parts[0].strip unless parts[0].nil?
+      val = parts[1].strip unless parts[1].nil?
+      if key != '' && val != ''
+        el2 = XML::Node.new('tag')
+        el2['k'] = key.to_s
+        el2['v'] = val.to_s
+        el << el2
+      end
+    end
+  end
+
+  def preconditions_ok?
+    from_node and from_node.visible and to_node and to_node.visible
+  end
+
 end