org.eclipse.osbp.preferences/src/org/eclipse/osbp/preferences/LocaleUtils.java

/**
 *                                                                            
 * Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 *                                                                            
 * All rights reserved. This program and the accompanying materials           
 * are made available under the terms of the Eclipse Public License v1.0       
 * which accompanies this distribution, and is available at                  
 * http://www.eclipse.org/legal/epl-v10.html                                 
 *                                                                            
 * Contributors:   
 * Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation 
 */
package org.eclipse.osbp.preferences;

import java.util.Arrays;
import java.util.Comparator;
import java.util.Locale;

public class LocaleUtils {
	
	private LocaleUtils() {	
	}
	
	/**
	 * @param locale
	 * @param displayByRespectiveLocale true, if the locale itself should be used to get the display name
	 * @return the display name for the given locale
	 */
	public static String getDisplayName(Locale locale, boolean displayByRespectiveLocale) {

		String displayName = displayByRespectiveLocale ?
				locale.getDisplayLanguage(locale) :
				locale.getDisplayLanguage();

		if (locale.getLanguage().length()>0 && locale.getCountry().length()>0){
			
			displayName = displayName + " " + ( displayByRespectiveLocale ? 
				locale.getDisplayCountry(locale) :
				locale.getDisplayCountry() );
			
			if (locale.getVariant().length()>0) {
				
				displayName = displayName + " " + ( displayByRespectiveLocale ? 
					locale.getDisplayVariant(locale):
					locale.getDisplayVariant() );
			} 
		}

		return displayName;
	}
	
	/**
	 * @param locales the array of locales, that should be sorted
	 * @param displayByRespectiveLocale true, if the locale itself should be used to get the display name for sorting
	 */
	public static void sortLocalesOnDisplayName(Locale[] locales, final boolean displayByRespectiveLocale) {
		Comparator<Locale> localeComparator = (locale1, locale2) -> {
				String locale1Name = displayByRespectiveLocale ? locale1.getDisplayName(locale1) : locale1.getDisplayName();
				String locale2Name = displayByRespectiveLocale ? locale2.getDisplayName(locale2) : locale2.getDisplayName();
				return locale1Name.compareTo(locale2Name);
		};
		Arrays.sort(locales, localeComparator);
	}	

}