rails way bits

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

diff --git a/app/models/node.rb b/app/models/node.rb
index d1bedd03cdf5f8284227ecab0675513847f34de5..f184a6ae97d54d4ce00e40a51097345161a1b4ab 100644 (file)
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -1,6 +1,107 @@
 class Node < ActiveRecord::Base
+  require 'xml/libxml'
   set_table_name 'current_nodes'
 
+  validates_numericality_of :latitude
+  validates_numericality_of :longitude
+  # FIXME validate lat and lon within the world
+
+  has_many :old_nodes, :foreign_key => :id
   belongs_to :user
 
+
+  def self.from_xml(xml, create=false)
+    p = XML::Parser.new
+    p.string = xml
+    doc = p.parse
+
+    node = Node.new
+
+    doc.find('//osm/node').each do |pt|
+
+
+      node.latitude = pt['lat'].to_f
+      node.longitude = pt['lon'].to_f
+
+      if node.latitude > 90 or node.latitude < -90 or node.longitude > 180 or node.longitude < -180
+        return nil
+      end
+
+      unless create
+        if pt['id'] != '0'
+          node.id = pt['id'].to_i
+        end
+      end
+
+      node.visible = pt['visible'] and pt['visible'] == 'true'
+
+      if create
+        node.timestamp = Time.now
+      else
+        if pt['timestamp']
+          node.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?
+
+      node.tags = tags
+
+    end
+    return node
+  end
+
+  def save_with_history
+    begin
+      Node.transaction do
+        self.save
+        old_node = OldNode.from_node(self)
+        old_node.save
+      end
+      return true
+    rescue Exception => ex
+      return nil
+    end
+  end
+
+  def to_xml
+    doc = XML::Document.new
+    doc.encoding = 'UTF-8' 
+    root = XML::Node.new 'osm'
+    root['version'] = '0.4'
+    root['generator'] = 'OpenStreetMap server'
+    doc.root = root
+    el1 = XML::Node.new 'node'
+    el1['id'] = self.id.to_s
+    el1['lat'] = self.latitude.to_s
+    el1['lon'] = self.longitude.to_s
+    Node.split_tags(el1, self.tags)
+    el1['visible'] = self.visible.to_s
+    el1['timestamp'] = self.timestamp.xmlschema
+    root << el1
+    return doc
+  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 = Node.new('tag')
+        el2['k'] = key.to_s
+        el2['v'] = val.to_s
+        el << el2
+      end
+    end
+  end
 end