/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *     "Apache Jetspeed" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache" or
 *    "Apache Jetspeed", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.jetspeed.services.security;

import java.util.Iterator;

import org.apache.turbine.services.Service;


// Turbine
import org.apache.turbine.services.TurbineServices;
import org.apache.turbine.services.Service;

// Jetspeed
import org.apache.jetspeed.om.security.Group;
import org.apache.jetspeed.services.security.JetspeedSecurityException;

/**
 * <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 1.2 2002/06/28 05:37:33 taylor 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);
    }

    /**
     * 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);
    }

    /**
     * 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);
    }

}











