CargoTracker.java

package net.java.cargotracker.interfaces.tracking.web;

import java.io.Serializable;
import java.util.List;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.view.ViewScoped;
import javax.inject.Inject;
import javax.inject.Named;
import net.java.cargotracker.domain.model.cargo.Cargo;
import net.java.cargotracker.domain.model.cargo.CargoRepository;
import net.java.cargotracker.domain.model.cargo.TrackingId;
import net.java.cargotracker.domain.model.handling.HandlingEvent;
import net.java.cargotracker.domain.model.handling.HandlingEventRepository;

/**
 * Controller for tracking cargo. This interface sits immediately on top of the
 * domain layer, unlike the booking interface which has a facade and supporting
 * DTOs in between.
 * <p/>
 * An adapter class, designed for the tracking use case, is used to wrap the
 * domain model to make it easier to work with in a web page rendering context.
 * We do not want to apply view rendering constraints to the design of our
 * domain model, and the adapter helps us shield the domain model classes.
 */
@Named
@ViewScoped
public class CargoTracker implements Serializable {

    private static final long serialVersionUID = 1L;
    private String trackingId;
    private CargoTrackingViewAdapter cargo;
    @Inject
    private CargoRepository cargoRepository;
    @Inject
    private HandlingEventRepository handlingEventRepository;

    public String getTrackingId() {
        return trackingId;
    }

    public void setTrackingId(String trackingId) {
        this.trackingId = trackingId;
    }

    public CargoTrackingViewAdapter getCargo() {
        return cargo;
    }

    public void setCargo(CargoTrackingViewAdapter cargo) {
        this.cargo = cargo;
    }

    public void trackCargo() {
        Cargo cargo = cargoRepository.find(new TrackingId(trackingId));

        if (cargo != null) {
            List<HandlingEvent> handlingEvents = handlingEventRepository
                    .lookupHandlingHistoryOfCargo(new TrackingId(trackingId))
                    .getDistinctEventsByCompletionTime();
            this.cargo = new CargoTrackingViewAdapter(cargo, handlingEvents);
        } else {
            // TODO Generate a Faces error messsage.	
            FacesContext context = FacesContext.getCurrentInstance();
            FacesMessage message = new FacesMessage(
                    "Cargo with tracking ID: " + trackingId + " not found.");
            message.setSeverity(FacesMessage.SEVERITY_ERROR);
            context.addMessage(null, message);
        }
    }
}