jcckit.graphic.FontStyle Maven / Gradle / Ivy
/*
* Copyright 2003-2004, Franz-Josef Elmer, 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 program 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
* (http://www.gnu.org/copyleft/lesser.html).
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package jcckit.graphic;
import java.util.Hashtable;
import jcckit.util.ConfigParameters;
import jcckit.util.FactoryException;
/**
* Font style constants.
* This class is based on the typesafe enumeration pattern.
*
* @author Franz-Josef Elmer
*/
public class FontStyle {
private static final Hashtable REPOSITORY = new Hashtable();
static final String NORMAL_TXT = "normal",
BOLD_TXT = "bold",
ITALIC_TXT = "italic",
BOLD_ITALIC_TXT = "bold italic";
/** Font style constant. */
public static final FontStyle NORMAL = new FontStyle(NORMAL_TXT),
BOLD = new FontStyle(BOLD_TXT),
ITALIC = new FontStyle(ITALIC_TXT),
BOLD_ITALIC = new FontStyle(BOLD_ITALIC_TXT);
private final String _description;
/** Non-public constructor to control the number of instances. */
private FontStyle(String description) {
_description = description;
REPOSITORY.put(description, this);
}
/**
* Returns from the specified configuration parameters the font style
* defined by the specified key or the specified default value.
* @param config Configuration parameters.
* @param key The key of the font style.
* @param defaultValue The default value.
* @return one of the four instances of FontStyle.
* @throws FactoryException if the value of the key-value pair denoted
* by key is neither normal, bold,
* italic, nor bold italic,
* Note, that {@link FactoryException#getClassName()}
* returns the invalid value.
*/
public static FontStyle getFontStyle(ConfigParameters config, String key,
FontStyle defaultValue) {
FontStyle result = defaultValue;
String value = config.get(key, null);
if (value != null) {
result = (FontStyle) REPOSITORY.get(value);
if (result == null) {
throw new FactoryException(config, key, "Invalid font style.");
}
}
return result;
}
/** Returns a human readable description for pretty printing. */
public String toString() {
return _description;
}
}