mirror of https://github.com/octoleo/plantuml.git
83 lines
3.1 KiB
Java
83 lines
3.1 KiB
Java
/*
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* Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details
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* (http://www.gnu.org/copyleft/lesser.html).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package jcckit.graphic;
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import java.util.Hashtable;
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import jcckit.util.ConfigParameters;
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import jcckit.util.FactoryException;
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/**
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* Font style constants.
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* This class is based on the typesafe enumeration pattern.
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*
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* @author Franz-Josef Elmer
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*/
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public class FontStyle {
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private static final Hashtable REPOSITORY = new Hashtable();
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static final String NORMAL_TXT = "normal",
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BOLD_TXT = "bold",
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ITALIC_TXT = "italic",
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BOLD_ITALIC_TXT = "bold italic";
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/** Font style constant. */
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public static final FontStyle NORMAL = new FontStyle(NORMAL_TXT),
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BOLD = new FontStyle(BOLD_TXT),
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ITALIC = new FontStyle(ITALIC_TXT),
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BOLD_ITALIC = new FontStyle(BOLD_ITALIC_TXT);
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private final String _description;
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/** Non-public constructor to control the number of instances. */
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private FontStyle(String description) {
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_description = description;
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REPOSITORY.put(description, this);
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}
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/**
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* Returns from the specified configuration parameters the font style
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* defined by the specified key or the specified default value.
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* @param config Configuration parameters.
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* @param key The key of the font style.
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* @param defaultValue The default value.
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* @return one of the four instances of <tt>FontStyle</tt>.
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* @throws FactoryException if the value of the key-value pair denoted
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* by <tt>key</tt> is neither <tt>normal</tt>, <tt>bold</tt>,
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* <tt>italic</tt>, nor <tt>bold italic</tt>,
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* Note, that {@link FactoryException#getClassName()}
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* returns the invalid value.
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*/
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public static FontStyle getFontStyle(ConfigParameters config, String key,
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FontStyle defaultValue) {
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FontStyle result = defaultValue;
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String value = config.get(key, null);
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if (value != null) {
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result = (FontStyle) REPOSITORY.get(value);
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if (result == null) {
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throw new FactoryException(config, key, "Invalid font style.");
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}
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}
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return result;
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}
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/** Returns a human readable description for pretty printing. */
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public String toString() {
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return _description;
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}
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}
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