Class: Layer

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
app/models/layer.rb

Defined Under Namespace

Modules: Geo

Constant Summary collapse

@@default_selection_styles = 
{
  'POLYGON' =>
    '<PolygonSymbolizer>'+
      '<Fill>'+
        '<CssParameter name="fill">#ff0090</CssParameter>'+
        '<CssParameter name="fill-opacity">0.6</CssParameter>'+
      '</Fill>'+
      '<Stroke>'+
        '<CssParameter name="stroke">#ff0090</CssParameter>'+
        '<CssParameter name="stroke-width">2.00</CssParameter>'+
      '</Stroke>'+
    '</PolygonSymbolizer>',
  'LINESTRING' =>
    '<LineSymbolizer>'+
      '<Stroke>'+
        '<CssParameter name="stroke">#ff0090</CssParameter>'+
        '<CssParameter name="stroke-width">10.00</CssParameter>'+
      '</Stroke>'+
    '</LineSymbolizer>',
  'POINT' =>
    '<PointSymbolizer>'+
       '<Graphic>'+
         '<Mark>'+
           '<WellKnownName>circle</WellKnownName>'+
           '<Fill>'+
             '<CssParameter name="fill">#ff0090</CssParameter>'+
           '</Fill>'+
         '</Mark>'+
         '<Size>45.0</Size>'+
       '</Graphic>'+
     '</PointSymbolizer>'
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.default_selection_styles ⇒ Object 



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# File 'app/models/layer.rb', line 342

def self.default_selection_styles
  @@default_selection_styles
end

.list(ability, layer_type, topic_name) ⇒ Object

Structure for Topic selection



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# File 'app/models/layer.rb', line 27

def self.list(ability, layer_type, topic_name)
  ActiveRecord::Base.silence do
    topic = Topic.accessible_by(ability).includes(:layers).where(:name => topic_name).first
    layers = topic.nil? ? [] : topic.layers.accessible_by(ability).all
    topic_layers = topic.nil? ? [] : topic.topics_layers.select {|tl| layers.include?(tl.layer) }
    wms_layer_list(ability, topic, topic_layers)
  end
end

.set_default_selection_styles(styles) ⇒ Object 



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# File 'app/models/layer.rb', line 338

def self.set_default_selection_styles(styles)
  @@default_selection_styles = styles
end

.wms_layer_list(ability, topic, topic_layers) ⇒ Object 



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# File 'app/models/layer.rb', line 36

def self.wms_layer_list(ability, topic, topic_layers)
  wms_layers = topic_layers.collect do |topic_layer|
    layer = topic_layer.layer
    {
      "id" => topic_layer.id,
      "layername"=> layer.name,
      "topic"=> topic.name,
      "groupname" => layer.sublayer_group.try(:name),
      "toclayertitle"=> layer.title,
      "leglayertitle"=> layer.title,
      "showscale"=> "true",
      "minscale"=> layer.minscale,
      "maxscale"=> layer.maxscale,
      "wms_sort"=> topic_layer.wms_sort, # MapServer layer order
      #"leg_sort"=> topic_layer.leg_sort, # Not used client side (Legend sort is in defined in HTML). Query result order. 
      #"query_sort"=> topic_layer.leg_sort, # deprecated
      "toc_sort"=> topic_layer.toc_sort, # Layer tree order
      "wms"=> "false",
      "visini"=> topic_layer.visini,
      "visuser"=> topic_layer.visini, #User visibility is in request_state
      "showtoc"=> "true",
      "editeable"=> ability.can?(:edit, layer)
    }
  end
  {
    "success" => true,
    "messageProperty"=> {"topic"=> topic.name, "legendtitle"=> "Legende", "legendraster"=> "true"},
    "results"=> wms_layers.size,
    "wmslayers"=> wms_layers
  }
end

Instance Method Details

#attribute(name) ⇒ Object 



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# File 'app/models/layer.rb', line 92

def attribute(name)
  if feature_class.nil?
    ::Attribute.new(self, name)
  else
    @attrs ||= feature_class.columns.inject({}) do |h, c|
      #logger.info "************************* feature_class column c #{c.inspect}"
      h[c.name] = ::Attribute.new(self, c.name)
      h
    end
    @attrs[name] ||= ::Attribute.new(self, name) #Add ad-hoc Attr. for calculated columns (e.g. custom SQL in query fields)
  end
  #logger.info "************************* Attribute for name '#{name}': #{@attrs[name].inspect}"
end

#feature_class ⇒ Object 



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# File 'app/models/layer.rb', line 72

def feature_class
  fc = "Geo::#{feature_class_name}".constantize rescue nil #Geo.const_defined?(feature_class_name) seems not to work here
  fc ||= Geo.module_eval "    class \#{feature_class_name} < GeoModel\n      self.table_name = '\#{table}'\n      self.primary_key = '\#{pkey}'\n\n      self\n    end\n"
end

#feature_class_name ⇒ Object 



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# File 'app/models/layer.rb', line 84

def feature_class_name
  table.camelize.singularize
end

#full_name ⇒ Object 



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# File 'app/models/layer.rb', line 68

def full_name
  "#{topic_name}-#{name}".downcase
end

#geometry_column ⇒ Object 



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# File 'app/models/layer.rb', line 88

def geometry_column
  feature_class.try(:geometry_column)
end

#get_feature_info(searchgeo) ⇒ Object 



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# File 'app/models/layer.rb', line 173

def get_feature_info(searchgeo)
  logger.debug searchgeo.inspect
  x1, y1, x2, y2 = searchgeo.split(',').collect(&:to_f)
  #Since we get the query coordinates and not pixels, we have to assume a certain scale
  dist = (x1*0.01).abs
  params = [
    "FEATURE_COUNT=10",
    "INFO_FORMAT=application/vnd.ogc.gml", #text/xml
    "REQUEST=GetFeatureInfo",
    "SERVICE=WMS",
    "BBOX=#{x1},#{y1},#{x1+dist},#{y1+dist}",
    "WIDTH=100",
    "HEIGHT=100",
    "X=0", "I=0",
    "Y=99", "J=99"
  ]
  url = "#{table}&#{params.join('&')}"
  logger.debug "*** Cascaded GetFeatureInfo: #{url}"
  uri = URI.parse(url)
  http = Net::HTTP::new(uri.host, uri.port, CASCADED_PROXY_ADDR, CASCADED_PROXY_PORT, CASCADED_PROXY_USER, CASCADED_PROXY_PASS)
  response = http.request(Net::HTTP::Get.new(uri.request_uri))
  #logger.debug response.body
  info_features = parse_ogc_gml(response.body)
  features = info_features.collect {|f| f[:attributes] }
  logger.debug features.to_s
  logger.debug "Number of features: #{features.size}"
  features
end

#ident_fields_for(ability) ⇒ Object 



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# File 'app/models/layer.rb', line 111

def ident_fields_for(ability)
  #attributes.accessible_by(ability) & fields
  #logger.info "************************* fields layer #{name}: #{ident_fields}"
  #logger.info "************************* roles: #{ability.roles.collect(&:name).join(',')}"
  fields = (ident_fields || pkey).split(',')
  allowed_fields = fields.select { |f| ability.can?(:show, attribute(f)) }
  #logger.info "************************* ident_fields layer #{name}: #{allowed_fields.inspect}"
  allowed_fields
end

#info ⇒ Object 



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# File 'app/models/layer.rb', line 245

def info
  @info ||= begin
    if File.exist?(info_file)
      "layers/custom/#{topic_name.downcase}/#{info_fname[1..-10]}"
    elsif !File.exist?(info_file_empty) && File.exist?(info_file_auto)
      "layers/custom/#{topic_name.downcase}/auto/#{info_fname[1..-10]}"
    else
      nil
    end
  end
end

#info_file ⇒ Object 



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# File 'app/models/layer.rb', line 232

def info_file
  File.join(Rails.root, 'app', 'views', 'layers', 'custom', topic_name.downcase, info_fname)
end

#info_file_auto ⇒ Object 



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# File 'app/models/layer.rb', line 236

def info_file_auto
  File.join(Rails.root, 'app', 'views', 'layers', 'custom', topic_name.downcase, 'auto', info_fname)
end

#info_file_empty ⇒ Object

ignore auto file if empty file exists



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# File 'app/models/layer.rb', line 241

def info_file_empty
  File.join(Rails.root, 'app', 'views', 'layers', 'custom', topic_name.downcase, "_#{name}_info_leer.html.erb")
end

#info_fname ⇒ Object

Partial for identify result



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# File 'app/models/layer.rb', line 228

def info_fname
  "_#{name}_info.html.erb"
end

#infotab ⇒ Object 



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# File 'app/models/layer.rb', line 261

def infotab
  #  INFOLAYOUT=0^1^2^3^4^5^6^7  *** Wenn der Parameter = 1 ist, wird ein leerer String �bergeben.
  #                              *** Wenn der Parameter = 0 ist, wird der entsprechende Teil weggelassen wenn m�glich
  #
  #  LayoutString(0) = "Im Umkreis von <EM>xUmkreisx</EM> Meter(n) wurde <EM>xAnzahlx</EM> Datensatz gefunden.<br><br>"
  #  LayoutString(1) = "Im Umkreis von <EM>xUmkreisx</EM> Meter(n) wurden <EM>xAnzahlx</EM> Datens&aumltze gefunden.<br><br>"
  #  LayoutString(2) = "layer"
  #  LayoutString(3) = "infotext"
  #  LayoutString(4) = "infotab"
  #  LayoutString(5) = "tabtitle"
  #  LayoutString(6) = "tabcell"
  #  LayoutString(7) = "2"  ( If = "" Then 1 Tabellenzeile pro Record [z.B. "1" oder ""], else [z.B. "2"] 1 Zeile pro Feld)

  "infotable_horizontal"
end

#infotext(count) ⇒ Object 



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# File 'app/models/layer.rb', line 257

def infotext(count)
  count > 0 ? "resultcount_p" : "resultcount_s"
end

#legend ⇒ Object 



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# File 'app/models/layer.rb', line 289

def legend
  @legend ||= begin
    if File.exist?(legend_file)
      "layers/custom/#{topic_name.downcase}/#{legend_fname[1..-10]}"
    elsif File.exist?(legend_file_auto)
      "layers/custom/#{topic_name.downcase}/auto/#{legend_fname[1..-10]}"
    else
      nil
    end
  end
end

#legend_file ⇒ Object 



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# File 'app/models/layer.rb', line 281

def legend_file
  File.join(Rails.root, 'app', 'views', 'layers', 'custom', topic_name.downcase, legend_fname)
end

#legend_file_auto ⇒ Object 



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# File 'app/models/layer.rb', line 285

def legend_file_auto
  File.join(Rails.root, 'app', 'views', 'layers', 'custom', topic_name.downcase, 'auto', legend_fname)
end

#legend_fname ⇒ Object 



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# File 'app/models/layer.rb', line 277

def legend_fname
  "_#{name}_legend.html.erb"
end

#parse_ogc_gml(xml) ⇒ Object 



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# File 'app/models/layer.rb', line 202

def parse_ogc_gml(xml)
  info_features = []
  fields = ident_fields.split(',')
  doc = Hpricot::XML(xml)

  (doc/"//gml:featureMember").each do |fm|
    fm.children.each do |feature|
      info_feature = {}

      # attributes
      attributes = {}
      feature.containers.each do |c|
        if fields.include?(c.name)
          attributes[c.name] = c.inner_text
        end
      end
      info_feature[:attributes] = attributes

      info_features << info_feature
    end
  end

  info_features
end

#query(ability, query_topic, searchgeo, nearest = nil) ⇒ Object 



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# File 'app/models/layer.rb', line 121

def query(ability, query_topic, searchgeo, nearest=nil)
  # use layer setting by default
  nearest = search_nearest if nearest.nil?

  if table =~ /^https?:/
    features = get_feature_info(searchgeo)
    [self, features, searchgeo.split(',')]
  elsif feature_class
    begin
      #query_topic: {... customQueries: {<layername>: <query_method> }
      #e.g.
      #{"queryTopics":[{
      #   "level":"main","topic":"Lageklassen2011ZH","divCls":"legmain","layers":"seen,lageklassen-2011-flaechen,grenzen,gemeindegrenzen,bezirkslabels"
      #   customQueries: {'seen': 'tiefen_statistik'},
      #   customParams: {'tiefe': 25}
      #  }]}
      custom_query_method = query_topic['customQueries'][name] rescue nil
      logger.debug "******** feature_class: #{feature_class} ***************************************************"
      logger.debug "******** Layer: #{name} ***************************************************"
      logger.debug "******** custom_query_method: #{custom_query_method} ***************************************************"
      logger.debug "******** query_topic: #{query_topic} ***************************************************"
      features = if custom_query_method
        logger.debug "*** Custom query on layer #{name}: #{query_topic.inspect}"
        feature_class.send(custom_query_method, self, query_topic, searchgeo)
      elsif feature_class.respond_to?(:identify_query)
        logger.debug "*** Custom identify_query on layer #{name}"
        feature_class.identify_query(searchgeo, searchdistance)
      else
        logger.debug "*** Identify on layer #{name} with query fields #{query_fields(ability)} at #{searchgeo.inspect}"
        feature_class.identify_filter(searchgeo, searchdistance, nearest).where(where_filter).select(query_fields(ability)).all
      end
      logger.debug "Number of features: #{features.size}"
      # calculate bbox of all features
      unless features.empty?
        envelope = GeoRuby::SimpleFeatures::Geometry.from_hex_ewkb(features.first['extent']).envelope
        features.each do |feature|
          next if feature == features.first
          envelope.extend!(GeoRuby::SimpleFeatures::Geometry.from_hex_ewkb(feature['extent']).envelope)
        end
        bbox = [envelope.lower_corner.x, envelope.lower_corner.y, envelope.upper_corner.x, envelope.upper_corner.y]
      end
    rescue Exception => e
      features = "Table: <b>#{table}</b><br/>Exception: #{e}<br/>query fields: #{query_fields(ability)}<br/>db fields: #{feature_class.column_names.join(',')}<br/>missing: <font color='red'>#{(query_fields(ability).split(',') - feature_class.column_names).join(', ')}</font><br/><br/>"
      logger.info "Identify error on layer #{name} #{features}"
    end
    [self, features, bbox]
  else
    logger.warn "Table for layer #{name} not found. (Table name: '#{table}')"
    nil
  end
end

#query_fields(ability) ⇒ Object 



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# File 'app/models/layer.rb', line 106

def query_fields(ability)
  return '' if feature_class.nil?
  ([pkey]+ident_fields_for(ability)+[feature_class.extent_field, feature_class.area_field]).join(',')
end

#quoted_wms_layers ⇒ Object 



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# File 'app/models/layer.rb', line 301

def quoted_wms_layers
  wms_layers.split(',').collect {|l| %Q<"#{l}"> }.join(',')
end

#selection_symbolizer ⇒ Object 



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# File 'app/models/layer.rb', line 346

def selection_symbolizer
  if selection_style.blank?
    gtyp = feature_class.geometry_type.sub(/^MULTI/, '').sub(/M$/, '') #MULTIPOINTM -> POINT 
    logger.error "Unsupported selection geometry type #{feature_class.geometry_type}" unless self.class.default_selection_styles.has_key?(gtyp)
    self.class.default_selection_styles[gtyp] || ''
  else
    selection_style
  end
end