/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You 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.io.File;

import java.util.Hashtable;

import java.util.Enumeration;

/**

 * Concrete implementation of the <strong>UserDatabase</code> interface

 * considers all directories in a directory whose pathname is specified

 * to our constructor to be "home" directories for those users.

 *

 * @author Craig R. McClanahan

 */

public final class HomesUserDatabase

    implements UserDatabase {

    // --------------------------------------------------------- Constructors

    /**

     * Initialize a new instance of this user database component.

     */

    public HomesUserDatabase() {

        super();

    }

    // --------------------------------------------------- Instance Variables

    /**

     * The set of home directories for all defined users, keyed by username.

     */

    private Hashtable homes = new Hashtable();

    /**

     * The UserConfig listener with which we are associated.

     */

    private UserConfig userConfig = null;

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

    /**

     * Return the UserConfig listener with which we are associated.

     */

    public UserConfig getUserConfig() {

        return (this.userConfig);

    }

    /**

     * Set the UserConfig listener with which we are associated.

     *

     * @param userConfig The new UserConfig listener

     */

    public void setUserConfig(UserConfig userConfig) {

        this.userConfig = userConfig;

        init();

    }

    // ------------------------------------------------------- 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 ((String) homes.get(user));

    }

    /**

     * Return an enumeration of the usernames defined on this server.

     */

    public Enumeration getUsers() {

        return (homes.keys());

    }

    // ------------------------------------------------------ Private Methods

    /**

     * Initialize our set of users and home directories.

     */

    private void init() {

        String homeBase = userConfig.getHomeBase();

        File homeBaseDir = new File(homeBase);

        if (!homeBaseDir.exists() || !homeBaseDir.isDirectory())

            return;

        String homeBaseFiles[] = homeBaseDir.list();

        for (int i = 0; i < homeBaseFiles.length; i++) {

            File homeDir = new File(homeBaseDir, homeBaseFiles[i]);

            if (!homeDir.isDirectory() || !homeDir.canRead())

                continue;

            homes.put(homeBaseFiles[i], homeDir.toString());

        }

    }

}