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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.

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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * ---------------
 * PadMessage.java
 * ---------------
 * (C) Copyright 2004, by Object Refinery Limited.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: PadMessage.java,v 1.4 2005/10/18 13:14:33 mungady Exp $
 *
 * Changes
 * -------
 * 15-Jul-2004 : Added JCommon header (DG);
 *
 */

package org.jfree.base.log;

import java.util.Arrays;

/**
 * A message object that pads the output if the text is shorter than
 * the given length. This is usefull when concating multiple messages,
 * which should appear in a table like style.
 *
 * @author Thomas Morgner
 */
public class PadMessage {

    /**
     * The message.
     */
    private final Object text;
  
    /**
     * The padding size.
     */
    private final int length;

    /**
     * Creates a new message.
     *
     * @param message the message.
     * @param length  the padding size.
     */
    public PadMessage(final Object message, final int length) {
        this.text = message;
        this.length = length;
    }

    /**
     * Returns a string representation of the message.
     *
     * @return the string.
     */
    public String toString() {
        final StringBuffer b = new StringBuffer();
        b.append(this.text);
        if (b.length() < this.length) {
            final char[] pad = new char[this.length - b.length()];
            Arrays.fill(pad, ' ');
            b.append(pad);
        }
        return b.toString();
    }
    
}