com.github.haixing_hu.swt.utils.Messages.java Source code

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/******************************************************************************
 *
 * Copyright (c) 2014  Haixing Hu
 *
 * 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:
 *     Haixing Hu (https://github.com/Haixing-Hu/) - Initial implementation and API.
 *
 ******************************************************************************/

package com.github.haixing_hu.swt.utils;

import java.util.Locale;

import org.springframework.context.support.ReloadableResourceBundleMessageSource;

/**
 * A class used to provide localized messages for the widgets.
 *
 * @author Haixing Hu
 */
public final class Messages {

    /**
     * The default encoding of the messages properties files. The value of this
     * constant is {@value}.
     */
    public static final String DEFAULT_ENCODING = "UTF-8";

    private static volatile Messages instance = null;

    /**
     * Gets the singleton instance of the {@link Message} class.
     * <p>
     * <b>NOTE:</b> This implementation use the "double checked locking" trick,
     * and it is only worked for the JDK >= 5.0.
     *
     * @return the singleton instance of the {@link Message} class.
     */
    public static Messages getInstance() {
        if (instance == null) {
            synchronized (Messages.class) {
                if (instance == null) {
                    instance = new Messages();
                }
            }
        }
        return instance;
    }

    private final Locale locale;
    private final ReloadableResourceBundleMessageSource source;

    private Messages() {
        locale = Locale.getDefault();
        source = new ReloadableResourceBundleMessageSource();
        source.setDefaultEncoding(DEFAULT_ENCODING);
        source.setBasename("classpath:messages");
    }

    /**
     * Gets the localized message for a specified key.
     *
     * @param key
     *          the key of the message.
     * @return the localized message for the specified key.
     */
    public String get(String key) {
        return source.getMessage(key, null, locale);
    }

    /**
     * Gets the localized message for a specified key formatted with specified
     * arguments.
     *
     * @param key
     *          the key of the message.
     * @param args
     *          the arguments used to format the message.
     * @return the localized message formatted with the specified arguments.
     */
    public String get(String key, Object... args) {
        return source.getMessage(key, args, locale);
    }
}