/**
    * This file Copyright (c) 2011 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.jcr.util;
  
  import info.magnolia.context.MgnlContext;
  import info.magnolia.jcr.wrapper.DelegateSessionWrapper;
  
  import javax.jcr.LoginException;
  import javax.jcr.Node;
  import javax.jcr.PathNotFoundException;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Session-related utility methods.
   *
   * @version $Id$
   */
  public class SessionUtil {
  
      private final static Logger log = LoggerFactory.getLogger(SessionUtil.class);
  
      public static boolean hasSameUnderlyingSession(Session first, Session second) {
          return unwrap(first).equals(unwrap(second));
      }
  
      public static Session unwrap(Session session) {
          return session instanceof DelegateSessionWrapper ? ((DelegateSessionWrapper) session).unwrap() : session;
      }
  
      /**
       * Return the Node for the Given Path from the given repository. In case of Exception, return null.
       */
      public static Node getNode(String repository, String path) {
          Node res = null;
          Session session;
          if (StringUtils.isBlank(repository) || StringUtils.isBlank(path)) {
              log.debug("getNode returns null because either nodePath: '" + path + "' or repository: '" + repository
                      + "' is empty");
              return res;
          }
          try {
              session = MgnlContext.getJCRSession(repository);
              if (session != null) {
                  res = session.getNode(path);
              }
          } catch (LoginException e) {
              log.error("Exeption during node Search for nodePath: '" + path + "' in repository: '" + repository + "'", e);
          } catch (PathNotFoundException e) {
              log.error("Exeption during node Search for nodePath: '" + path + "' in repository: '" + repository + "'", e);
          } catch (RepositoryException e) {
              log.error("Exeption during node Search for nodePath: '" + path + "' in repository: '" + repository + "'", e);
          } catch (IllegalArgumentException e) {
              log.error("Exeption during node Search for nodePath: '" + path + "' in repository: '" + repository + "'", e);
          }
          return res;
      }
  }