MessageExtractor.java

/*******************************************************************************
 * Copyright (c) 2012 IBM Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompanies this distribution.
 *
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *
 *     Russell Boykin       - initial API and implementation
 *     Alberto Giammaria    - initial API and implementation
 *     Chris Peters         - initial API and implementation
 *     Gianluca Bernardini  - initial API and implementation
 *******************************************************************************/
package org.eclipse.lyo.client.exception.exception;

import java.text.MessageFormat;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;

public class MessageExtractor {

    private static final String CLASS = MessageExtractor.class.getName();
    private static final Logger logger = Logger.getLogger(CLASS);
    private static final String BUNDLE_NAME = "oslc4jclient";
    private static ResourceBundle bundle = null;

    private MessageExtractor(){
    }

    private static synchronized ResourceBundle getMessageBundle(final Locale locale){
        if(bundle == null) {
            bundle = ResourceBundle.getBundle(BUNDLE_NAME, locale);
        }
        return bundle;
    }

    private static String getString(final Locale locale, final String key, final Object[] args ) {
        final ResourceBundle messages = getMessageBundle(locale);

        if (messages != null) {
            try {
                final String message = messages.getString( key );
                return formatMessage(locale, message, args);
            } catch ( final MissingResourceException missingResourceException ) {
                logger.log(Level.SEVERE, missingResourceException.getMessage(), missingResourceException );
                return "???" + key + "???";
            }
        }

        logger.log(Level.SEVERE, "missing resource: " + key);
        return "???" + key + "???";
    }

    private static String formatMessage(final Locale locale, final String message, final Object[] args) {
        final String fixedMessage = FixMessageFormat.fixPattern(message);
        return new MessageFormat(fixedMessage, locale).format(args);
    }

    public static String getMessage(final Locale locale, final String key, final Object[] params){
        return getString(locale, key, params);
    }

    public static String getMessage(final Locale locale, final String key){
        return getMessage(locale, key, null);
    }

    public static String getMessage(final String key){
        return getMessage(key, null);
    }

    public static String getMessage(final String key, final Object[] params){
        return getMessage(Locale.getDefault(), key, params);
    }
}