/*
    * Copyright 2000-2004 The Apache Software Foundation.
    * 
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    * 
    *      http://www.apache.org/licenses/LICENSE-2.0
    * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.jetspeed.services.security;
  
  import java.util.Iterator;
  
  import org.apache.jetspeed.om.security.Group;
  import org.apache.turbine.services.TurbineServices;
  
  /***
   * <p> The <code>GroupManagement</code> interface describes contract between
   * the portal and security provider required for Jetspeed Group Management.
   * This interface enables an application to be independent of the underlying
   * group management technology.
   *
   * @author <a href="mailto:david@bluesunrise.com">David Sean Taylor</a>
   * @version $Id: JetspeedGroupManagement.java,v 1.5 2004/02/23 03:58:11 jford Exp $
   */
  
  public abstract class JetspeedGroupManagement
  {
      public String SERVICE_NAME = "GroupManagement";
  
      /*
       * Utility method for accessing the service
       * implementation
       *
       * @return a GroupManagement implementation instance
       */
      protected static GroupManagement getService()
      {
          return (GroupManagement)TurbineServices
          .getInstance().getService(GroupManagement.SERVICE_NAME);
      }
  
      /***
       * Retrieves all <code>Group</code>s for a given username principal.
       *
       * The security service may optionally check the current user context
       * to determine if the requestor has permission to perform this action.
       *
       * @param username a user principal identity to be retrieved.
       * @return Iterator over all groups associated to the user principal.
       * @exception GroupException when the security provider has a general failure.
       * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
       */
      public static Iterator getGroups(String username)
          throws JetspeedSecurityException
      {
          return getService().getGroups(username);
      }
  
      /***
       * Retrieves all <code>Group</code>s.
       *
       * The security service may optionally check the current user context
       * to determine if the requestor has permission to perform this action.
       *
       * @return Iterator over all groups.
       * @exception GroupException when the security provider has a general failure.
       * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
       */
      public static Iterator getGroups()
          throws JetspeedSecurityException
      {
          return getService().getGroups();
      }
  
      /***
       * Adds a <code>Group</code> into permanent storage.
       *
       *
       * @exception GroupException when the security provider has a general failure.
       * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
       */
      public static void addGroup(Group group)
          throws JetspeedSecurityException
      {
          getService().addGroup(group);
      }
  
      /***
       * Saves a <code>Group</code> into permanent storage.
       *
       *
      * @exception GroupException when the security provider has a general failure.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
      */
     public static void saveGroup(Group group)
         throws JetspeedSecurityException
     {
         getService().saveGroup(group);
     }
 
     /***
      * Removes a <code>Group</code> from the permanent store.
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @param groupname the principal identity of the group to be retrieved.
      * @exception GroupException when the security provider has a general failure.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
      */
     public static void removeGroup(String groupname)
         throws JetspeedSecurityException
     {
         getService().removeGroup(groupname);
     }
 
     /***
      * Join a user to a group.
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @exception GroupException when the security provider has a general failure retrieving users.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
      */
     public static void joinGroup(String username, String groupname)
         throws JetspeedSecurityException
     {
         getService().joinGroup(username,groupname);
     }
 
     /***
      * Join a user to a group - specific role.
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @exception GroupException when the security provider has a general failure retrieving groups.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
      */
     public static void joinGroup(String username, String groupname, String rolename)
         throws JetspeedSecurityException
     {
         getService().joinGroup(username,groupname, rolename);
     }
 
 
     /***
      * Unjoin a user from a group.
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @exception GroupException when the security provider has a general failure retrieving users.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
      */
     public static void unjoinGroup(String username, String groupname)
         throws JetspeedSecurityException
     {
         getService().unjoinGroup(username,groupname);
     }
 
     /***
      * Unjoin a user from a group - specific role.
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @exception GroupException when the security provider has a general failure retrieving users.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
      */
     public static void unjoinGroup(String username, String groupname, String rolename)
         throws JetspeedSecurityException
     {
         getService().unjoinGroup(username,groupname,rolename);
     }
 
 
     /***
      * Checks for the relationship of user has a group. Returns true when the user has the given group.
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @exception GroupException when the security provider has a general failure retrieving users.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
      */
     public static boolean inGroup(String username, String groupname)
         throws JetspeedSecurityException
     {
         return getService().inGroup(username,groupname);
     }
 
     /***
      * Retrieves a single <code>Group</code> for a given groupname principal.
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @param groupname a group principal identity to be retrieved.
      * @return Group the group record retrieved.
      * @exception GroupException when the security provider has a general failure.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege
      */
     public static Group getGroup(String groupname)
         throws JetspeedSecurityException
     {
         return getService().getGroup(groupname);
     }
 }