go web sample - web presenter

WebPresenter.go

package interfaceadapter

type WebPresenter struct {
  mExternalDevice ExternalDevice
}

func NewWebPresenter(aExternalDevice ExternalDevice) *WebPresenter {
  return &WebPresenter{
    mExternalDevice:aExternalDevice,
  }
}

func (r WebPresenter) Output(aDataSource map[string]string){

  if aDataSource["result"] == "Failed" {
    r.mExternalDevice.Display("<b>Failed.</b>")
  }else{
    r.mExternalDevice.Display("<b>Successfully completed.</b>")
  }
  r.mExternalDevice.Display("<table>")
  r.displayIfDataSourceIsExists(aDataSource, "Process:", "process")
  r.displayIfDataSourceIsExists(aDataSource, "Amount:", "amount_of_money")
  r.displayIfDataSourceIsExists(aDataSource, "Balance:", "balance")
  r.mExternalDevice.Display("</table>")
}

func (r WebPresenter)displayIfDataSourceIsExists(aDataSource map[string]string, dataSourceDisplayName string, dataSourceKey string){
  if value, ok := aDataSource[dataSourceKey]; ok{
    r.mExternalDevice.Display("<tr><td>" + dataSourceDisplayName + "</td><td>" + value + "</td></tr>")
  }
}