Source Code Cross Referenced for UserDatabase.java in  » Web-Framework » struts-1.3.8 » org » apache » struts » apps » mailreader » dao » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » struts 1.3.8 » org.apache.struts.apps.mailreader.dao 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: UserDatabase.java 471754 2006-11-06 14:55:09Z husted $
003:         *
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *  http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:        package org.apache.struts.apps.mailreader.dao;
022:
023:        /**
024:         * <p>A <strong>Data Access Object</strong> (DAO) interface describing
025:         * the available operations for retrieving and storing {@link User}s
026:         * (and their associated {@link Subscription}s) in some persistence layer
027:         * whose characteristics are not specified here.  One or more implementations
028:         * will be created to perform the actual I/O that is required.</p>
029:         *
030:         * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
031:         * @since Struts 1.1
032:         */
033:        public interface UserDatabase {
034:
035:            // --------------------------------------------------------- Public Methods
036:
037:            /**
038:             * <p>Create and return a new {@link User} defined in this user database.
039:             * </p>
040:             *
041:             * @param username Username of the new user
042:             *
043:             * @exception IllegalArgumentException if the specified username
044:             *  is not unique
045:             */
046:            public User createUser(String username);
047:
048:            /**
049:             * <p>Finalize access to the underlying persistence layer.</p>
050:             *
051:             * @exception Exception if a database access error occurs
052:             */
053:            public void close() throws Exception;
054:
055:            /**
056:             * <p>Return the existing {@link User} with the specified username,
057:             * if any; otherwise return <code>null</code>.</p>
058:             *
059:             * @param username Username of the user to retrieve
060:             * @throws ExpiredPasswordException if user password has expired
061:             * and must be changed
062:             */
063:            public User findUser(String username)
064:                    throws ExpiredPasswordException;
065:
066:            /**
067:             * <p>Return the set of {@link User}s defined in this user database.</p>
068:             */
069:            public User[] findUsers();
070:
071:            /**
072:             * <p>Return true if open() has been called.</p>
073:             *
074:             * @exception Exception if a database access error occurs
075:             */
076:            public boolean isOpen();
077:
078:            /**
079:             * <p>Initiate access to the underlying persistence layer.</p>
080:             *
081:             * @exception Exception if a database access error occurs
082:             */
083:            public void open() throws Exception;
084:
085:            /**
086:             * Remove the specified {@link User} from this database.
087:             *
088:             * @param user User to be removed
089:             *
090:             * @exception IllegalArgumentException if the specified user is not
091:             *  associated with this database
092:             */
093:            public void removeUser(User user);
094:
095:            /**
096:             * <p>Save any pending changes to the underlying persistence layer.</p>
097:             *
098:             * @exception Exception if a database access error occurs
099:             */
100:            public void save() throws Exception;
101:
102:        }
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