001/*
002 * $Id: StringValue.java 3297 2009-03-11 13:45:10Z kleopatra $
003 *
004 * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
005 * Santa Clara, California 95054, U.S.A. All rights reserved.
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 * 
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015 * Lesser General Public License for more details.
016 * 
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
020 */
021package org.jdesktop.swingx.renderer;
022
023import java.io.Serializable;
024
025
026/**
027 * A simple converter to return a String representation of an object.
028 * 
029 * This class is intended to be the "small coin" to configure/format textual
030 * cell content of concrete subclasses of <code>ComponentProvider</code>.
031 * <p>
032 * 
033 * F.i. to show a Contributor cell object as "Busywoman, Herta" implement a
034 * custom StringValue and use it in a text rendering provider.
035 * 
036 * <pre><code>
037 * StringValue stringValue = new StringValue() {
038 * 
039 *     public String getString(Object value) {
040 *         if (!(value instanceof Contributor))
041 *             return TO_STRING.getString(value);
042 *         Contributor contributor = (Contributor) value;
043 *         return contributor.lastName + &quot;, &quot; + contributor.firstName;
044 *     }
045 * 
046 * };
047 * 
048 * ComponentProvider provider = new LabelProvider(stringValue);
049 * table.setDefaultRenderer(Contributor.class, 
050 *   new DefaultTableRenderer(provider));
051 * </code></pre>
052 * 
053 * <p>
054 * 
055 * PENDING: use a full-fledged Format instead?
056 * Would impose a higher burden onto implementors but could be re-used in
057 * editors.
058 * 
059 * @author Jeanette Winzenburg
060 * 
061 * @see ComponentProvider
062 * @see LabelProvider
063 * @see DefaultTableRenderer
064 * @see DefaultListRenderer
065 * @see DefaultTreeRenderer
066 */
067public interface StringValue extends Serializable {
068
069    /**
070     * Returns a string representation of the given value. <p>
071     * 
072     * PENDING JW: forgot - why not null return guaranteed?
073     * 
074     * @param value the object to present as a string
075     * @return a string representation of the given value, 
076     *  guaranteed to be not null
077     */
078    String getString(Object value);
079}