saif(struts1 interceptor)

/* * $Header: /cvsroot/struts/saif/src/struts-example/java/org/apache/struts/webapp/example/memory/MemoryUserDatabase.java,v 1.1.1.1 2003/08/05 20:00:40 mrdon Exp $ * $Revision: 1.1.1.1 $ * $Date: 2003/08/05 20:00:40 $ * * ==================================================================== * * The Apache Software License, Version 1.1 * * Copyright (c) 1999-2002 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. 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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.struts.webapp.example.memory; import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.util.HashMap; import org.apache.commons.digester.Digester; import org.apache.commons.digester.ObjectCreationFactory; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.struts.webapp.example.Subscription; import org.apache.struts.webapp.example.User; import org.apache.struts.webapp.example.UserDatabase; import org.xml.sax.Attributes; /** * <p>Concrete implementation of {@link UserDatabase} for an in-memory * database backed by an XML data file.</p> * * @author Craig R. McClanahan * @version $Revision: 1.1.1.1 $ $Date: 2003/08/05 20:00:40 $ * @since Struts 1.1 */ public final class MemoryUserDatabase implements UserDatabase { // ----------------------------------------------------------- Constructors // ----------------------------------------------------- Instance Variables /** * Logging output for this user database instance. */ private Log log = LogFactory.getLog(this.getClass()); /** * The {@link User}s associated with this UserDatabase, keyed by username. */ private HashMap users = new HashMap(); // ------------------------------------------------------------- Properties /** * Absolute pathname to the persistent file we use for loading and storing * persistent data. */ private String pathname = null; private String pathnameOld = null; private String pathnameNew = null; public String getPathname() { return (this.pathname); } public void setPathname(String pathname) { this.pathname = pathname; pathnameOld = pathname + ".old"; pathnameNew = pathname + ".new"; } // --------------------------------------------------------- Public Methods /** * <p>Finalize access to the underlying persistence layer.</p> * * @exception Exception if a database access error occurs */ public void close() throws Exception { save(); } /** * <p>Create and return a new {@link User} defined in this user database. * </p> * * @param username Username of the new user * * @exception IllegalArgumentExceptionif the specified username * is not unique */ public User createUser(String username) { synchronized (users) { if (users.get(username) != null) { throw new IllegalArgumentException("Duplicate user '" + username + "'"); } if (log.isTraceEnabled()) { log.trace("Creating user '" + username + "'"); } MemoryUser user = new MemoryUser(this, username); synchronized (users) { users.put(username, user); } return (user); } } /** * <p>Return the existing {@link User} with the specified username, * if any; otherwise return <code>null</code>.</p> * * @param username Username of the user to retrieve */ public User findUser(String username) { synchronized (users) { return ((User) users.get(username)); } } /** * <p>Return the set of {@link User}s defined in this user database.</p> */ public User[] findUsers() { synchronized (users) { User results[] = new User[users.size()]; return ((User[]) users.values().toArray(results)); } } /** * <p>Initiate access to the underlying persistence layer.</p> * * @exception Exception if a database access error occurs */ public void open() throws Exception { FileInputStream fis = null; BufferedInputStream bis = null; try { // Acquire an input stream to our database file if (log.isDebugEnabled()) { log.debug("Loading database from '" + pathname + "'"); } fis = new FileInputStream(pathname); bis = new BufferedInputStream(fis); // Construct a digester to use for parsing Digester digester = new Digester(); digester.push(this); digester.setValidating(false); digester.addFactoryCreate ("database/user", new MemoryUserCreationFactory(this)); digester.addFactoryCreate ("database/user/subscription", new MemorySubscriptionCreationFactory(this)); // Parse the input stream to initialize our database digester.pa