001/* ===========================================================
002 * Orson Charts : a 3D chart library for the Java(tm) platform
003 * ===========================================================
004 * 
005 * (C)opyright 2013-2022, by David Gilbert.  All rights reserved.
006 * 
007 * https://github.com/jfree/orson-charts
008 * 
009 * This program is free software: you can redistribute it and/or modify
010 * it under the terms of the GNU General Public License as published by
011 * the Free Software Foundation, either version 3 of the License, or
012 * (at your option) any later version.
013 *
014 * This program is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017 * GNU General Public License for more details.
018 *
019 * You should have received a copy of the GNU General Public License
020 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
021 * 
022 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
023 * Other names may be trademarks of their respective owners.]
024 * 
025 * If you do not wish to be bound by the terms of the GPL, an alternative
026 * commercial license can be purchased.  For details, please see visit the
027 * Orson Charts home page:
028 * 
029 * http://www.object-refinery.com/orsoncharts/index.html
030 * 
031 */
032
033package org.jfree.chart3d.plot;
034
035import java.awt.Font;
036
037/**
038 * An object that supplies {@code Font} instances associated with
039 * keys.  This is used by the {@link PiePlot3D} class to obtain section label
040 * fonts for each data item(segment) in the chart.  A default implementation
041 * ({@link StandardFontSource}) is provided.
042 */
043public interface FontSource<K> {
044
045    /**
046     * Returns a font based on the supplied key.
047     * 
048     * @param key  the key ({@code null} not permitted).
049     * 
050     * @return A font (never {@code null}). 
051     */
052    Font getFont(K key);
053    
054    /**
055     * Sets the font associated with a key.
056     * 
057     * @param key  the key ({@code null} not permitted).
058     * @param font  the font ({@code null} not permitted).
059     */
060    void setFont(K key, Font font);
061    
062    /**
063     * Restyles the source using the specified font.  Refer to the implementing
064     * class to confirm the precise behaviour (typically all existing font
065     * settings are cleared and this font is installed as the new default
066     * section label font).
067     * 
068     * @param font  the font ({@code null} not permitted). 
069     * 
070     * @since 1.2
071     */
072    void style(Font font);
073 
074}