/* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.rowset; import java.io.*;import java.util.*; /** * This class is used to help in localization of resources, * especially the exception strings. * * @author Amit Handa */ public class JdbcRowSetResourceBundle implements Serializable {     /**     * This <code>String</code> variable stores the location     * of the resource bundle location.     */    private static String fileName;     /**     * This variable will hold the <code>PropertyResourceBundle</code>     * of the text to be internationalized.     */    private transient PropertyResourceBundle propResBundle;     /**     * The constructor initializes to this object     *     */    private static volatile JdbcRowSetResourceBundle jpResBundle;     /**     * The variable which will represent the properties     * the suffix or extension of the resource bundle.     **/    private static final String PROPERTIES = "properties";     /**     * The variable to represent underscore     **/    private static final String UNDERSCORE = "_";     /**     * The variable which will represent dot     **/    private static final String DOT = ".";     /**     * The variable which will represent the slash.     **/    private static final String SLASH = "/";     /**     * The variable where the default resource bundle will     * be placed.     **/    private static final String PATH = "com/sun/rowset/RowSetResourceBundle";     /**     * The constructor which initializes the resource bundle.     * Note this is a private constructor and follows Singleton     * Design Pattern.     *     * @throws IOException if unable to load the ResourceBundle     * according to locale or the default one.     */    private JdbcRowSetResourceBundle () throws IOException {        // Try to load the resource bundle according        // to the locale. Else if no bundle found according        // to the locale load the default.         // In default case the default locale resource bundle        // should always be loaded else it        // will be difficult to throw appropriate        // exception string messages.        Locale locale = Locale.getDefault();         // Load appropriate bundle according to locale         propResBundle = (PropertyResourceBundle) ResourceBundle.getBundle(PATH,                           locale, Thread.currentThread().getContextClassLoader());    }     /**     * This method is used to get a handle to the     * initialized instance of this class. Note that     * at any time there is only one instance of this     * class initialized which will be returned.     *     * @throws IOException if unable to find the RowSetResourceBundle.properties     */    public static JdbcRowSetResourceBundle getJdbcRowSetResourceBundle()    throws IOException {          if(jpResBundle == null){             synchronized(JdbcRowSetResourceBundle.class) {                if(jpResBundle == null){                    jpResBundle = new JdbcRowSetResourceBundle();                } //end if             } //end synchronized block         } //end if         return jpResBundle;    }     /**     * This method returns an enumerated handle of the keys     * which correspond to values translated to various locales.     *     * @return an enumeration of keys which have messages tranlated to     * corresponding locales.     */    public Enumeration getKeys() {       return propResBundle.getKeys();    }      /**     * This method takes the key as an argument and     * returns the corresponding value reading it     * from the Resource Bundle loaded earlier.     *     * @return value in locale specific language     * according to the key passed.     */    public Object handleGetObject(String key) {       return propResBundle.handleGetObject(key);    }     static final long serialVersionUID = 436199386225359954L;}