ProjectManager.java

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package jsf2.demo.scrum.web.controller;

import jsf2.demo.scrum.model.entities.Project;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.faces.application.FacesMessage;
import javax.inject.Named;
import javax.enterprise.context.SessionScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.ValidatorException;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import java.io.Serializable;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.context.ExternalContext;

/**
 * @author Dr. Spock (spock at dev.java.net)
 */
@Named("projectManager")
@SessionScoped
public class ProjectManager extends AbstractManager implements Serializable {

    private static final long serialVersionUID = 1L;
    private Project currentProject;

    @PostConstruct
    public void construct() {
        Project project = new Project();
        setCurrentProject(project);
    }

    @PreDestroy
    public void destroy() {
        currentProject = null;
        FacesContext context = FacesContext.getCurrentInstance();
        if (null != context) {
            ExternalContext extContext = context.getExternalContext();
            if (null != extContext) {
                Map sessionMap = extContext.getSessionMap();
                if (null != sessionMap) {
                    sessionMap.remove("projectManager");
                }
            }
        }
    }

    public String create() {
        Project project = new Project();
        setCurrentProject(project);
        return "create";
    }

    public String save() {
        if (getCurrentProject() != null) {
            try {
                Project merged = doInTransaction(new PersistenceAction<Project>() {

                    public Project execute(EntityManager em) {
                        Project toSave = getCurrentProject();
                        if (toSave.isNew()) {
                            em.persist(toSave);
                        } else if (!em.contains(currentProject)) {
                            return em.merge(toSave);
                        }
                        return toSave;
                    }
                });
                if (!currentProject.equals(merged)) {
                    setCurrentProject(merged);
                }
            } catch (Exception e) {
                getLogger(getClass()).log(Level.SEVERE, "Error on try to save Project: " + getCurrentProject(), e);
                addMessage("Error on try to save Project", FacesMessage.SEVERITY_ERROR);
                return null;
            }
        }
        return "show";
    }

    public String edit(Project project) {
        setCurrentProject(project);
        // Using implicity navigation, this request come from /projects/show.xhtml and directs to /project/edit.xhtml
        return "edit";
    }

    public String remove(final Project project) {
        if (project != null) {
            try {
                doInTransaction(new PersistenceActionWithoutResult() {

                    public void execute(EntityManager em) {
                        Query query = em.createNamedQuery("task.remove.ByProject");
                        query.setParameter("project", project);
                        query.executeUpdate();

                        query = em.createNamedQuery("story.remove.ByProject");
                        query.setParameter("project", project);
                        query.executeUpdate();

                        query = em.createNamedQuery("sprint.remove.ByProject");
                        query.setParameter("project", project);
                        query.executeUpdate();
                        
                        Object toRemove = em.find(Project.class, project.getId());
                        assert(null != toRemove);

                        em.remove(toRemove);
                    }
                });
            } catch (Exception e) {
                getLogger(getClass()).log(Level.SEVERE, "Error on try to remove Project: " + getCurrentProject(), e);
                addMessage("Error on try to remove Project", FacesMessage.SEVERITY_ERROR);
                return null;
            }
        }
        // Using implicity navigation, this request come from /projects/show.xhtml and directs to /project/show.xhtml
        // could be null instead
        return "show";
    }

    public void checkUniqueProjectName(FacesContext context, UIComponent component, Object newValue) {
        final String newName = (String) newValue;
        try {
            Long count = doInTransaction(new PersistenceAction<Long>() {

                public Long execute(EntityManager em) {
                    Query query = em.createNamedQuery((getCurrentProject().isNew()) ? "project.new.countByName" : "project.countByName");
                    query.setParameter("name", newName);
                    if (!currentProject.isNew()) {
                        query.setParameter("currentProject", getCurrentProject());
                    }
                    return (Long) query.getSingleResult();
                }
            });
            if (count != null && count > 0) {
                throw new ValidatorException(getFacesMessageForKey("project.form.label.name.unique"));
            }
        } catch (ManagerException ex) {
            Logger.getLogger(ProjectManager.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public String cancelEdit() {
        // Implicity navigation, this request come from /projects/edit.xhtml and directs to /project/show.xhtml
        return "show";
    }

    public String showSprints(Project project) {
        setCurrentProject(project);
        // Implicity navigation, this request come from /projects/show.xhtml and directs to /project/showSprints.xhtml
        return "showSprints";
    }

    public Project getCurrentProject() {
        return currentProject;
    }

    public void setCurrentProject(Project currentProject) {
        this.currentProject = currentProject;
    }

    public String viewSprints() {
        return "/sprint/show";
    }


}