UserSelectionForGroup.java

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/*
 * Project: Server for annotations sharing
 * Author: Ing. Jaroslav Dytrych idytrych@fit.vutbr.cz
 * File: UserSelectionForGroup.java
 * Description: Backbean for page with selection of user
 */

/**
 * @file UserSelectionForGroup.java
 *
 * @brief Backbean for page with selection of user
 */

package cz.vutbr.fit.knot.annotations.web;

import cz.vutbr.fit.knot.annotations.app.AppBean;
import cz.vutbr.fit.knot.annotations.app.Constants;
import cz.vutbr.fit.knot.annotations.entity.User;
import cz.vutbr.fit.knot.annotations.entity.UserGroup;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.component.html.HtmlDataTable;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;

/**
 * Backbean for page with selection of user
 *
 * @brief Backbean for page with selection of user
 * @author idytrych
 */
@ManagedBean
@ViewScoped
public class UserSelectionForGroup implements Serializable {
  /**
   * Table with users
   */
  private HtmlDataTable listTable;
  /**
   * User selected in the table
   */
  private User user;
  /**
   * Error message to display
   */
  private String errorMessage = "";
  /**
   * Edited user group (for selection variant)
   */
  private UserGroup editedUG = null;
  /**
   * Backup of form data
   */
  private Object formBackup = null;

  /**
   * Constructor
   */
  public UserSelectionForGroup() {
    this.user = new User();
  }

  /**
   * Gets user selected in the table
   *
   * @return Returns user selected in the table
   */
  public User getUser() {
    return user;
  }

  /**
   * Sets user selected in the table
   *
   * @param user
   */
  public void setUser(User user) {
    this.user = user;
  }

  /**
   * Gets table with user
   *
   * @return Returns table with user
   */
  public HtmlDataTable getListTable() {
    return listTable;
  }

  /**
   * Sets table with user
   *
   * @param listTable Table with user
   */
  public void setListTable(HtmlDataTable listTable) {
    this.listTable = listTable;
  }

  /**
   * Gets list of all existing users which aren't in given group
   *
   * @return Returns list of users
   */
  public List<User> getUsersList() {
    if (editedUG == null) {
      editedUG = SessionManager.getSession().getEditedUG();
      formBackup = SessionManager.getSession().getFormBackup();
    }
    @SuppressWarnings("unchecked")
    List<User> retList = AppBean.getPersistenceManager().getEntitiesByName("User");
    // remove users already in group
    for (Iterator<User> it = retList.iterator(); it.hasNext();) {
      User u = it.next();
      if (editedUG.getUsers().contains(u)) {
        it.remove();
      }
    }
    return retList;
  }

  /**
   * Action listener for select links in table
   *
   * @returns Returns page outcome (identificator of next page or null to stay here)
   */
  public String btnSelectAction(Integer id) {
    // gets row data of selected row
    User refU = new User(id);
    int index = getUsersList().indexOf(refU);
    user = getUsersList().get(index);
    try {
      EntityManager em = AppBean.getPersistenceManager().getEM();
      EntityTransaction transaction = em.getTransaction();
      transaction.begin();
      user = em.merge(user);
      editedUG = em.merge(editedUG);
      editedUG.getUsers().add(user);  // remove user from group
      user.addGroup(editedUG);
      em.flush();
      transaction.commit();
    } catch (Exception e) {
      errorMessage = MessageProvider.getMessage("ucerCantBeAddedDBFailure");
      if (Constants.LOG_LEVEL >= Constants.LOG_LEVEL_SERVER_ERRORS) {
        String msg = "Adding of user to user group failed.";
        Logger.getLogger(UserSelectionForGroup.class.getName()).log(Level.SEVERE, msg, e);
      }
      return null;
    }
    
    AppBean.refreshUsersInSessions(user);  // refreshes data in sessions
    
    SessionManager.getSession().setEditedUG(editedUG);
    SessionManager.getSession().setFormBackup(formBackup);
    return "editUG";
  }

  /**
   * Action listener for cancel button
   *
   * @return Returns page outcome (identificator of next page)
   */
  public String btnCancelAction() {
    SessionManager.getSession().setEditedUG(editedUG);
    SessionManager.getSession().setFormBackup(formBackup);
    return "editUG";
  }

  /**
   * Gets error message to display
   *
   * @return Returns error message to display
   */
  public String getErrorMessage() {
    return errorMessage;
  }

  /**
   * Sets error message to display
   *
   * @param errorMessage Error message to display
   */
  public void setErrorMessage(String errorMessage) {
    this.errorMessage = errorMessage;
  }

}  // public class UserSelectionForGroup