/*

 * Copyright (c) 2005, 2011, 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, JdbcRowSetResourceBundle.class.getModule());

   }

    /**

     * 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.

     */

    @SuppressWarnings("rawtypes")

    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;

}