org.jdesktop.swingx.renderer.StringValue Maven / Gradle / Ivy
/*
* Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jdesktop.swingx.renderer;
import java.io.Serializable;
/**
* A simple converter to return a String representation of an object.
*
* This class is intended to be the "small coin" to configure/format textual
* cell content of concrete subclasses of ComponentProvider.
*
*
* F.i. to show a Contributor cell object as "Busywoman, Herta" implement a
* custom StringValue and use it in a text rendering provider.
*
*
* StringValue stringValue = (Object value) -> {
* if(value instanceof Contributor c) {
* return c.lastName + ", " + contributor.firstName;
* }
* return TO_STRING.getString(value);
* };
*
* ComponentProvider provider = new LabelProvider(stringValue);
* table.setDefaultRenderer(Contributor.class, new DefaultTableRenderer(provider));
*
*
*
*
* PENDING: use a full-fledged Format instead?
* Would impose a higher burden onto implementors but could be re-used in editors.
*
* @author Jeanette Winzenburg
*
* @see ComponentProvider
* @see LabelProvider
* @see DefaultTableRenderer
* @see DefaultListRenderer
* @see DefaultTreeRenderer
*/
/*
Interfaces mit einer einzigen abstrakten Methode heißen neuerdings "Functional Interface Types"
oder auch "SAM Types". "SAM" steht für "Single Abstract Method".
Solche Interfaces können mit der Annotation @FunctionalInterface versehen werden
und haben für Lambdas eine besondere Bedeutung,
da sie die einzigen Typen sind, die als "Target-Typing-Zieltypen" in Frage kommen.
siehe: https://www.torsten-horn.de/techdocs/java-lambdas.htm#SAM
interface StringValue ist "SAM" !!!
*/
@FunctionalInterface
public interface StringValue extends Serializable {
/**
* Returns a string representation of the given value.
*
* PENDING JW: forgot - why not null return guaranteed?
*
* @param value the object to present as a string
* @return a string representation of the given value,
* guaranteed to be not null
*/
String getString(Object value);
}