Cargo tracking form

[paulrayner]

Implement cargo tracking form. User can enter tracking id and the cargo information will be displayed:

• tracking ID
• transport status
• next expected activity
• destination
• eta
• handling events sorted by completion time (icon to show whether each event is expected or not)

In .NET port Track.aspx form has:

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<CargoTrackingViewAdapter>" %>
<%@ Import Namespace="DDDSample.UI.BookingAndTracking.Models"%>

<asp:Content ID="trackCargoTitle" ContentPlaceHolderID="TitleContent" runat="server">
    Track your cargo
</asp:Content>
<asp:Content ID="trackCargoContent" ContentPlaceHolderID="MainContent" runat="server">
    <%= Html.ValidationSummary() %>
    <% using (Html.BeginForm())
       { %>
    <div id="TrackingId">
        <span>
            <label for="trackingId">
                Enter your tracking id:</label>
        </span><span>
            <%= Html.TextBox("trackingId") %>
            <%= Html.ValidationMessage("trackingId", "*")%>
        </span><span>        
            <input type="submit" value="Track!" />
        </span>
    </div>
    <% } %>
    <% if (Model != null) { %>
    <div id="TrackingDetails">
    <h2><%=Model.StatusText %></h2>
    <p>Estimated time of arrival in <%=Model.Destination %>: <%=Model.Eta %></p>
    <p><%=Model.NextExpectedActivity %></p>

      <h3>Handling History</h3>
        <ul style="list-style-type: none;">
            <% foreach (HandlingEventViewAdapter @event in Model.HandlingEvents)
               { %>
            <li>
                <p>
                <% if (@event.IsExpected)
                   {%>
                   <img style="vertical-align: top;" src="../../Content/images/tick.png" alt=""/>
                <%}
                   else
                   {%>
                   <img style="vertical-align: top;" src="../../Content/images/error.png" alt=""/>
                <%} %>                
                &nbsp;<%[email protected]%></p>
            </li>            
            <% } %>
        </ul>
        <p><%=Html.ActionLink("Register new handling event", "RegisterHandlingEvent", "Handling", new { trackingId = Model.TrackingId}, null)%></p>         
    </div>
    <% } %>
</asp:Content>

It uses CargoTrackingViewAdapter as a wrapper around the Cargo and (associated) Handling Event aggregate to keep the domain objects isolated from the UI concerns. Some code of interest is:

      public string StatusText
      {
         get
         {                       
            switch (_cargo.Delivery.TransportStatus)
            {
               case TransportStatus.InPort:
                  return Resources.Messages.cargo_status_IN_PORT.UIFormat(_cargo.Delivery.LastKnownLocation.Name);
               case TransportStatus.OnboardCarrier:
                  return Resources.Messages.cargo_status_ONBOARD_CARRIER.UIFormat("XXX");
               case TransportStatus.Claimed:
                  return Resources.Messages.cargo_status_CLAIMED.UIFormat();
               case TransportStatus.NotReceived:
                  return Resources.Messages.cargo_status_NOT_RECEIVED.UIFormat();
               case TransportStatus.Unknown:
                  return Resources.Messages.cargo_status_UNKNOWN.UIFormat();
            }
            throw new NotSupportedException();
         }
      }


      public String NextExpectedActivity
      {
         get
         {
            HandlingActivity activity = _cargo.Delivery.NextExpectedActivity;
            if (activity == null)
            {
               return "";
            }

            const string text = "Next expected activity is to ";
            HandlingEventType type = activity.EventType;
            if (type == HandlingEventType.Load)
            {
               return
                  text + type.ToString().ToLower() + " cargo onto voyage XXX" +
                  " in " + activity.Location.Name;
            }
            if (type == HandlingEventType.Unload)
            { 
               return
                  text + type.ToString().ToLower() + " cargo off of XXX" +
                  " in " + activity.Location.Name;
            }
            return text + type.ToString().ToLower() + " cargo in " + activity.Location.Name;
         }
      }

      public string Eta
      {
         get
         {
            DateTime? eta = _cargo.Delivery.EstimatedTimeOfArrival;
            return eta.HasValue ? eta.ToString() : "?";
         }
      }