/*
 * Copyright 1999,2004 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.catalina.startup;


import java.util.Enumeration;


/**
 * Abstraction of the set of users defined by the operating system on the
 * current server platform.
 *
 * @author Craig R. McClanahan
 * @version $Revision$ $Date$
 */

public interface UserDatabase {


    // ----------------------------------------------------------- Properties


    /**
     * Return the UserConfig listener with which we are associated.
     */
    public UserConfig getUserConfig();


    /**
     * Set the UserConfig listener with which we are associated.
     *
     * @param userConfig The new UserConfig listener
     */
    public void setUserConfig(UserConfig userConfig);


    // ------------------------------------------------------- Public Methods


    /**
     * Return an absolute pathname to the home directory for the specified user.
     *
     * @param user User for which a home directory should be retrieved
     */
    public String getHome(String user);


    /**
     * Return an enumeration of the usernames defined on this server.
     */
    public Enumeration getUsers();


}