SessionManager.java

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/*
 * Project: Server for annotations sharing
 * Author: Ing. Jaroslav Dytrych idytrych@fit.vutbr.cz
 * File: SessionManager.java
 * Description: Class for manipulating with session
 */

/**
 * @file SessionManager.java
 *
 * @brief Class for manipulating with session
 */

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

import javax.el.ExpressionFactory;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;

/**
 * Class for manipulating with session
 *
 * @brief Class for manipulating with session
 * @author idytrych
 */
public class SessionManager {

  /**
   * Constructor
   */
  public SessionManager() {
  }

  /**
   * Gets instance of object for handling custom session variables
   *
   * @return Returns instance of object for handling custom session variables
   */
  public static WebSession getSession() {
    FacesContext facesContext = FacesContext.getCurrentInstance();
    HttpSession session = (HttpSession) facesContext.getExternalContext().getSession(false);
    WebSession webSession = (WebSession) session.getAttribute("WebSession");
    if (webSession == null) {
      webSession = new WebSession();
      session.setAttribute("WebSession", webSession);
    }
    return webSession;
  }

  /**
   * Gets instance of other session scoped bean
   *
   * @param name Name of bean
   * @return Instance of session scoped bean
   */
  public static Object getBeanByName(String name) {
    FacesContext context = FacesContext.getCurrentInstance();
    ExpressionFactory ef = context.getApplication().getExpressionFactory();
    ValueExpression ve = ef.createValueExpression(context.getELContext(), "#{" + name + "}", Object.class);
    return ve.getValue(context.getELContext());
  }

}  // public class SessionManager