package com.oreilly.jent.struts.library.ui;

/**
 * In general, you may use the code in this book in your programs and 
 * documentation. You do not need to contact us for permission unless 
 * you're reproducing a significant portion of the code. For example, 
 * writing a program that uses several chunks of code from this book does 
 * not require permission. Selling or distributing a CD-ROM of examples 
 * from O'Reilly books does require permission. Answering a question by 
 * citing this book and quoting example code does not require permission. 
 * Incorporating a significant amount of example code from this book into 
 * your product's documentation does require permission.
 * 
 * We appreciate, but do not require, attribution. An attribution usually 
 * includes the title, author, publisher, and ISBN. For example: 
 * 
 *   "Java Enterprise in a Nutshell, Third Edition, 
 *    by Jim Farley and William Crawford 
 *    with Prakash Malani, John G. Norman, and Justin Gehtland. 
 *    Copyright 2006 O'Reilly Media, Inc., 0-596-10142-2."
 *  
 *  If you feel your use of code examples falls outside fair use or the 
 *  permission given above, feel free to contact us at 
 *  permissions@oreilly.com.
 */

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;

import com.oreilly.jent.struts.library.model.Library;
import com.oreilly.jent.struts.library.session.UserSession;

public abstract class LibraryBaseAction extends Action {

  protected Library getLibrary() {
    return (Library) servlet.getServletContext().getAttribute(
        WebGlobals.LIBRARY_KEY);
  }

  /**
   * Return the UserSession from the session.
   * 
   * @param request
   * @return the UserSession
   * @throws RuntimeException
   */
  protected UserSession getUserSession(HttpServletRequest request) {
    HttpSession session = (HttpSession) request.getSession();
    if (session == null) {
      throw new RuntimeException("Couldn't get a reference to the Session");
    }
    UserSession userSession = (UserSession) session.getAttribute(WebGlobals.USER_SESSION_KEY);
    if (userSession == null) {
      throw new RuntimeException("Couldn't retrieve UserSession attribute from Session");
    }
    return userSession;
  }
}