func setCommonOptions(_ layer: inout <%= layerType %>Layer) -> Bool {
    var changed = false
<% if (layerType !== 'Sky') { %>
    if let sourceLayerID = sourceLayerID {
      layer.sourceLayer = sourceLayerID
      changed = true
    }

    if let sourceID = sourceID {
      if !(existingLayer && sourceID == DEFAULT_SOURCE_ID) && hasSource() {
        layer.source = sourceID
        changed = true
      }
    }

    if let filter = filter, filter.count > 0 {
      do {
        let data = try JSONSerialization.data(withJSONObject: filter, options: .prettyPrinted)
        let decodedExpression = try JSONDecoder().decode(Expression.self, from: data)
        layer.filter = decodedExpression
        changed = true
      } catch {
        Logger.log(level: .error, message: "parsing filters failed for layer \(optional: id): \(error.localizedDescription)")
      }
    }
<% } %>
    return changed
  }

  override func setOptions(_ layer: inout Layer) {
    super.setOptions(&layer)
    if var actualLayer = layer as? LayerType {
      if self.setCommonOptions(&actualLayer) {
        layer = actualLayer
      }
    } else {
      Logger.log(level: .error, message: "Expected layer type to be <%= layerType %> but was \(type(of: layer))")
    }
  }

  override func apply(style : Style) throws {
    try style.updateLayer(withId: id, type: LayerType.self) { (layer : inout <%= layerType %>Layer) in
      if self.styleLayer != nil {
        self.setOptions(&self.styleLayer!)
      }
      if let styleLayer = self.styleLayer as? LayerType {
        layer = styleLayer
      }
    }
  }