/* * Copyright (c) 1999, 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.security.auth.callback; /** * <p> Underlying security services instantiate and pass a * <code>PasswordCallback</code> to the <code>handle</code> * method of a <code>CallbackHandler</code> to retrieve password information. * * @see javax.security.auth.callback.CallbackHandler */public class PasswordCallback implements Callback, java.io.Serializable {     private static final long serialVersionUID = 2267422647454909926L;     /**     * @serial     * @since 1.4     */    private String prompt;    /**     * @serial     * @since 1.4     */    private boolean echoOn;    /**     * @serial     * @since 1.4     */    private char[] inputPassword;     /**     * Construct a <code>PasswordCallback</code> with a prompt     * and a boolean specifying whether the password should be displayed     * as it is being typed.     *     * <p>     *     * @param prompt the prompt used to request the password. <p>     *     * @param echoOn true if the password should be displayed     *                  as it is being typed.     *     * @exception IllegalArgumentException if <code>prompt</code> is null or     *                  if <code>prompt</code> has a length of 0.     */    public PasswordCallback(String prompt, boolean echoOn) {        if (prompt == null || prompt.length() == 0)            throw new IllegalArgumentException();         this.prompt = prompt;        this.echoOn = echoOn;    }     /**     * Get the prompt.     *     * <p>     *     * @return the prompt.     */    public String getPrompt() {        return prompt;    }     /**     * Return whether the password     * should be displayed as it is being typed.     *     * <p>     *     * @return the whether the password     *          should be displayed as it is being typed.     */    public boolean isEchoOn() {        return echoOn;    }     /**     * Set the retrieved password.     *     * <p> This method makes a copy of the input <i>password</i>     * before storing it.     *     * <p>     *     * @param password the retrieved password, which may be null.     *     * @see #getPassword     */    public void setPassword(char[] password) {        this.inputPassword = (password == null ? null : password.clone());    }     /**     * Get the retrieved password.     *     * <p> This method returns a copy of the retrieved password.     *     * <p>     *     * @return the retrieved password, which may be null.     *     * @see #setPassword     */    public char[] getPassword() {        return (inputPassword == null ? null : inputPassword.clone());    }     /**     * Clear the retrieved password.     */    public void clearPassword() {        if (inputPassword != null) {            for (int i = 0; i < inputPassword.length; i++)                inputPassword[i] = ' ';        }    }}