UserGroupSelectionForUser.java

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

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

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

  /**
   * Constructor
   */
  public UserGroupSelectionForUser() {
    this.userGroup = new UserGroup();
  }

  /**
   * Gets user group selected in the table
   *
   * @return Returns user group selected in the table
   */
  public UserGroup getUserGroup() {
    return userGroup;
  }

  /**
   * Sets user group selected in the table
   *
   * @param userGroup
   */
  public void setUserGroup(UserGroup userGroup) {
    this.userGroup = userGroup;
  }

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

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

  /**
   * Gets list of all existing user groups in which aren't given user
   *
   * @return Returns list of user groups
   */
  public List<UserGroup> getUserGroupsList() {
    if (editedUser == null) {
      editedUser = SessionManager.getSession().getEditedUser();
      formBackup = SessionManager.getSession().getFormBackup();
    }
    @SuppressWarnings("unchecked")
    List<UserGroup> retList = AppBean.getPersistenceManager().getEntitiesByName("UserGroup");
    // remove user groups in which user already is
    for (Iterator<UserGroup> it = retList.iterator(); it.hasNext();) {
      UserGroup ug = it.next();
      if (editedUser.getGroups().contains(ug)) {
        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) {
    // get row data of selected row
    UserGroup refUG = new UserGroup(id);
    int index = getUserGroupsList().indexOf(refUG);
    userGroup = getUserGroupsList().get(index);
    try {
      EntityManager em = AppBean.getPersistenceManager().getEM();
      EntityTransaction transaction = em.getTransaction();
      transaction.begin();
      editedUser = em.merge(editedUser);
      userGroup = em.merge(userGroup);
      if (!userGroup.getUsers().contains(editedUser)) {
        userGroup.getUsers().add(editedUser);
      }
      editedUser.addGroup(userGroup);
      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(UserGroupSelectionForUser.class.getName()).log(Level.SEVERE, msg, e);
      }
      return null;
    }
    
    AppBean.refreshUsersInSessions(editedUser);  // refreshes data in sessions
    
    SessionManager.getSession().setEditedUser(editedUser);
    SessionManager.getSession().setFormBackup(formBackup);
    return "editUser";
  }

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

  /**
   * 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 UserGroupSelectionForUser