/**
    * This file Copyright (c) 2003-2011 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.cms.security;
  
  import java.util.ArrayList;
  import java.util.Collection;
  
  import info.magnolia.cms.beans.config.ContentRepository;
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.ItemType;
  import info.magnolia.cms.core.HierarchyManager;
  import info.magnolia.context.MgnlContext;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.jcr.PathNotFoundException;
  
  
  /**
   * Manages groups stored in the {@link ContentRepository#USER_GROUPS} workspace.
   * @author Sameer Charles $Id: MgnlGroupManager.java 41137 2011-01-06 18:19:25Z gjoseph $
   */
  public class MgnlGroupManager implements GroupManager {
      private static final Logger log = LoggerFactory.getLogger(MgnlGroupManager.class);
  
      public Group createGroup(String name) throws UnsupportedOperationException, AccessDeniedException {
          try {
              Content node = getHierarchyManager().createContent("/", name, ItemType.GROUP.getSystemName());
              getHierarchyManager().save();
              return newGroupInstance(node);
          }
          catch (Exception e) {
              log.error("can't create group [" + name + "]", e);
              return null;
          }
      }
  
      public Group getGroup(String name) throws UnsupportedOperationException, AccessDeniedException {
          try {
              return newGroupInstance(getHierarchyManager().getContent(name));
          } catch (PathNotFoundException e) {
              // this is not an error, once we have MAGNOLIA-1757 implemented we can change this.
              log.warn("can't find group [" + name + "] in magnolia");
              log.debug("can't find group [" + name + "] in magnolia", e);
          } catch (AccessDeniedException e) {
              throw e;
          } catch (Throwable e) {
              log.error("Exception while retrieving group", e);
          }
          return null;
      }
  
      public Collection<Group> getAllGroups() {
          Collection<Group> groups = new ArrayList<Group>();
          try {
              Collection<Content> nodes = getHierarchyManager().getRoot().getChildren(ItemType.GROUP);
              for (Content node : nodes) {
                  groups.add(newGroupInstance(node));
              }
          }
          catch (Exception e) {
              log.error("can't find user");
          }
          return groups;
      }
  
      protected Group newGroupInstance(Content node) {
         return new MgnlGroup(node);
     }
 
     /**
      * Returns the HierarchyManager (through the system context).
      */
     protected HierarchyManager getHierarchyManager() {
         return MgnlContext.getSystemContext().getHierarchyManager(ContentRepository.USER_GROUPS);
     }
 }