/*
    * Copyright 2000-2001,2004 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;
  
  
  // Turbine
  import org.apache.turbine.services.TurbineServices;
  
  
  import org.apache.jetspeed.om.security.Permission;
  
  /***
   * <p> The <code>PermissionManagement</code> interface describes contract between 
   * the portal and security provider required for Jetspeed Permission Management.
   * This interface enables an application to be independent of the underlying 
   * permission management technology.
   *
   * @author <a href="mailto:david@bluesunrise.com">David Sean Taylor</a>
   * @version $Id: JetspeedPermissionManagement.java,v 1.4 2004/02/23 03:58:11 jford Exp $
   */
  
  public abstract class JetspeedPermissionManagement
  {
      public String SERVICE_NAME = "PermissionManagement";
  
      /*
       * Utility method for accessing the service
       * implementation
       *
       * @return a PermissionManagement implementation instance
       */
      protected static PermissionManagement getService()
      {
          return (PermissionManagement)TurbineServices
          .getInstance().getService(PermissionManagement.SERVICE_NAME);
      }
  
      /***
       * Retrieves all <code>Permission</code>s for a given rolename principal.
       *   
       * The security service may optionally check the current user context
       * to determine if the requestor has permission to perform this action.
       *
       * @param rolename a role name identity to be retrieved.
       * @return Iterator over all permissions associated to the role principal.
       * @exception PermissionException when the security provider has a general failure.
       * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
       */
      public static Iterator getPermissions(String rolename)
          throws JetspeedSecurityException
      {
          return getService().getPermissions(rolename);
      }
  
      /***
       * Retrieves all <code>Permission</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 permissions.
       * @exception PermissionException when the security provider has a general failure.
       * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
       */
      public static Iterator getPermissions()
          throws JetspeedSecurityException
      {
          return getService().getPermissions();
      }
  
      /***
       * Adds a <code>Permission</code> into permanent storage. 
       *
       * The security service may optionally check the current user context
       * to determine if the requestor has permission to perform this action.
       *
       * @exception PermissionException when the security provider has a general failure.
       * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
       */
      public static void addPermission(Permission permission)
          throws JetspeedSecurityException
      {
          getService().addPermission(permission);
     }
 
     /***
      * Saves a <code>Permission</code> into permanent storage. 
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @exception PermissionException when the security provider has a general failure.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
      */
     public static void savePermission(Permission permission)
         throws JetspeedSecurityException
     {
         getService().savePermission(permission);
     }
 
     /***
      * Removes a <code>Permission</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 permissionName the principal identity of the permission to be retrieved.
      * @exception PermissionException when the security provider has a general failure.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
      */
     public static void removePermission(String permissionName)
         throws JetspeedSecurityException
     {
         getService().removePermission(permissionName);
     }
 
     /***
      * Grants a permission to a role. 
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @param roleName grant a permission to this role.
      * @param permissionName the permission to grant to the role.
      * @exception PermissionException when the security provider has a general failure retrieving permissions.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
      */
     public static void grantPermission(String roleName, String permissionName)
         throws JetspeedSecurityException
     {
         getService().grantPermission(roleName, permissionName);
     }
 
     /***
      * Revokes a permission from a role. 
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @param roleName grant a permission to this role.
      * @param permissionName the permission to grant to the role.     
      * @exception PermissionException when the security provider has a general failure retrieving permissions.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
      */
     public static void revokePermission(String roleName, String permissionName)
         throws JetspeedSecurityException
     {
         getService().revokePermission(roleName,permissionName);
     }
 
     /***
      * Checks for the relationship of role has a permission. Returns true when the role has the given permission.
      *
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @param roleName grant a permission to this role.
      * @param permissionName the permission to grant to the role.    
      * @exception PermissionException when the security provider has a general failure retrieving permissions.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
      */
     public static boolean hasPermission(String roleName, String permissionName)
         throws JetspeedSecurityException
     {
         return getService().hasPermission(roleName,permissionName);
     }
 
     /***
      * Retrieves a single <code>Permission</code> for a given permissionName principal.
      *   
      * The security service may optionally check the current user context
      * to determine if the requestor has permission to perform this action.
      *
      * @param permissionName a permission principal identity to be retrieved.
      * @return Permission the permission record retrieved.
      * @exception PermissionException when the security provider has a general failure.
      * @exception InsufficientPrivilegeException when the requestor is denied due to insufficient privilege 
      */
     public static Permission getPermission(String permissionName)
         throws JetspeedSecurityException
     {
         return getService().getPermission(permissionName);
     }
 
 }