/*
 * 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>TextOutputCallback</code> to the <code>handle</code>
 * method of a <code>CallbackHandler</code> to display information messages,
 * warning messages and error messages.
 *
 * @see javax.security.auth.callback.CallbackHandler
 */
public class TextOutputCallback implements Callback, java.io.Serializable {

    private static final long serialVersionUID = 1689502495511663102L;

    /** Information message. */
    public static final int INFORMATION         = 0;
    /** Warning message. */
    public static final int WARNING             = 1;
    /** Error message. */
    public static final int ERROR               = 2;

    /**
     * @serial
     * @since 1.4
     */
    private int messageType;
    /**
     * @serial
     * @since 1.4
     */
    private String message;

    /**
     * Construct a TextOutputCallback with a message type and message
     * to be displayed.
     *
     * <p>
     *
     * @param messageType the message type (<code>INFORMATION</code>,
     *                  <code>WARNING</code> or <code>ERROR</code>). <p>
     *
     * @param message the message to be displayed. <p>
     *
     * @exception IllegalArgumentException if <code>messageType</code>
     *                  is not either <code>INFORMATION</code>,
     *                  <code>WARNING</code> or <code>ERROR</code>,
     *                  if <code>message</code> is null,
     *                  or if <code>message</code> has a length of 0.
     */
    public TextOutputCallback(int messageType, String message) {
        if ((messageType != INFORMATION &&
                messageType != WARNING && messageType != ERROR) ||
            message == null || message.length() == 0)
            throw new IllegalArgumentException();

        this.messageType = messageType;
        this.message = message;
    }

    /**
     * Get the message type.
     *
     * <p>
     *
     * @return the message type (<code>INFORMATION</code>,
     *                  <code>WARNING</code> or <code>ERROR</code>).
     */
    public int getMessageType() {
        return messageType;
    }

    /**
     * Get the message to be displayed.
     *
     * <p>
     *
     * @return the message to be displayed.
     */
    public String getMessage() {
        return message;
    }
}