/*
 * Copyright 1999-2003 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package javax.security.auth.callback;

/**
 * <p> Underlying security services instantiate and pass a
 * <code>NameCallback</code> to the <code>handle</code>
 * method of a <code>CallbackHandler</code> to retrieve name information.
 *
 * @see javax.security.auth.callback.CallbackHandler
 */
public class NameCallback implements Callback, java.io.Serializable {

    private static final long serialVersionUID = 3770938795909392253L;

    /**
     * @serial
     * @since 1.4
     */
    private String prompt;
    /**
     * @serial
     * @since 1.4
     */
    private String defaultName;
    /**
     * @serial
     * @since 1.4
     */
    private String inputName;

    /**
     * Construct a <code>NameCallback</code> with a prompt.
     *
     * <p>
     *
     * @param prompt the prompt used to request the name.
     *
     * @exception IllegalArgumentException if <code>prompt</code> is null
     *                  or if <code>prompt</code> has a length of 0.
     */
    public NameCallback(String prompt) {
        if (prompt == null || prompt.length() == 0)
            throw new IllegalArgumentException();
        this.prompt = prompt;
    }

    /**
     * Construct a <code>NameCallback</code> with a prompt
     * and default name.
     *
     * <p>
     *
     * @param prompt the prompt used to request the information. <p>
     *
     * @param defaultName the name to be used as the default name displayed
     *                  with the prompt.
     *
     * @exception IllegalArgumentException if <code>prompt</code> is null,
     *                  if <code>prompt</code> has a length of 0,
     *                  if <code>defaultName</code> is null,
     *                  or if <code>defaultName</code> has a length of 0.
     */
    public NameCallback(String prompt, String defaultName) {
        if (prompt == null || prompt.length() == 0 ||
            defaultName == null || defaultName.length() == 0)
            throw new IllegalArgumentException();

        this.prompt = prompt;
        this.defaultName = defaultName;
    }

    /**
     * Get the prompt.
     *
     * <p>
     *
     * @return the prompt.
     */
    public String getPrompt() {
        return prompt;
    }

    /**
     * Get the default name.
     *
     * <p>
     *
     * @return the default name, or null if this <code>NameCallback</code>
     *          was not instantiated with a <code>defaultName</code>.
     */
    public String getDefaultName() {
        return defaultName;
    }

    /**
     * Set the retrieved name.
     *
     * <p>
     *
     * @param name the retrieved name (which may be null).
     *
     * @see #getName
     */
    public void setName(String name) {
        this.inputName = name;
    }

    /**
     * Get the retrieved name.
     *
     * <p>
     *
     * @return the retrieved name (which may be null)
     *
     * @see #setName
     */
    public String getName() {
        return inputName;
    }
}