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Glassfish example source code file (LocalStringsImpl.java)

This example Glassfish source code file (LocalStringsImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Glassfish tags/keywords

exception, exception, localstrings, localstringsimpl, localstringsimpl, messageformat, object, resourcebundle, resourcebundle, stacktraceelement, string, string, text, util

The Glassfish LocalStringsImpl.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

/*
 * LocalStringsImpl.java
 *
 * Created on December 3, 2005, 5:26 PM
 *
 */
package com.sun.enterprise.universal.i18n;

import java.util.*;
import java.util.ResourceBundle;
import java.text.MessageFormat;

/**
 * This class makes getting localized strings super-simple.  This is the companion 
 * class to Strings.  Use this class when performance may be an issue.  I.e. Strings
 * is all-static and creates a ResourceBundle on every call.  This class is instantiated
 * once and can be used over and over from the same package.
 * <p>Specifics:
 * <ul>
 *    <li>Your calling code should have a file named LocalStrings.properties in its 
 * package directory.
 *    <li>If your localized string has no arguments call get(String) to get the localized
 *    String value.
 *    <li>If you have a parameterized string, call get(String, Object...)
 * </ul>
 * <p>Note: You can not get an Exception out of calling this code!  If the String
 * or the properties file does not exist, it will return the String that you gave 
 * in the first place as the argument.
 * <p>Example:
 * <ul>
 * <li> LocalStringsImpl sh = new LocalStringsImpl();
 * <li>String s = sh.get("xyz");
 * <li>String s = sh.get("xyz", new Date(), 500, "something", 2.00003);
 * <li>String s = sh.get("xyz", "something", "foo", "whatever");
 * </ul>
 * 
 * @author bnevins
 */
public class LocalStringsImpl {

    /**
     * Create a LocalStringsImpl instance.  
     * Automatically discover the caller's LocalStrings.properties file
     */
    public LocalStringsImpl() {
        setBundle();
    }

    /**
     * Create a LocalStringsImpl instance.  
     * use the proffered class object to find LocalStrings.properties.
     * This is the constructor to use if you are concerned about getting
     * the fastest performance.
     */
    public LocalStringsImpl(Class clazz) {
        setBundle(clazz);
    }

    /**
     * Create a LocalStringsImpl instance.  
     * use the proffered String.  The String is the FQN of the properties file,
     * without the '.properties'.  E.g. 'com.elf.something.LogStrings' 
     */
    public LocalStringsImpl(String packageName, String propsName) {
        this.propsName = propsName;
        int len = packageName.length();

        // side-effect -- make sure it ends in '.'
        if (packageName.charAt(len - 1) != '.') {
            packageName += '.';
        }

        setBundle(packageName);
    }

    /**
     * Get a String from the caller's package's LocalStrings.properties
     * @param indexString The string index into the localized string file
     * @return the String from LocalStrings or the supplied String if it doesn't exist
     */
    public String get(String indexString) {
        try {
            return getBundle().getString(indexString);
        }
        catch (Exception e) {
            // it is not an error to have no key...
            return indexString;
        }
    }

    /**
     * Get and format a String from the caller's package's LocalStrings.properties
     * @param indexString The string index into the localized string file
     * @param objects The arguments to give to MessageFormat
     * @return the String from LocalStrings or the supplied String if it doesn't exist --
     * using the array of supplied Object arguments
     */
    public String get(String indexString, Object... objects) {
        indexString = get(indexString);

        try {
            MessageFormat mf = new MessageFormat(indexString);
            return mf.format(objects);
        }
        catch (Exception e) {
            return indexString;
        }
    }

    /**
     * Get a String from the caller's package's LocalStrings.properties
     * @param indexString The string index into the localized string file
     * @return the String from LocalStrings or the supplied default value if it doesn't exist
     */
    public String getString(String indexString, String defaultValue) {
        try {
            return getBundle().getString(indexString);
        }
        catch (Exception e) {
            // it is not an error to have no key...
            return defaultValue;
        }
    }

    /**
     * Get an integer from the caller's package's LocalStrings.properties
     * @param indexString The string index into the localized string file
     * @return the integer value from LocalStrings or the supplied default if 
     * it doesn't exist or is bad.
     */
    public int getInt(String indexString, int defaultValue) {
        try {
            String s = getBundle().getString(indexString);
            return Integer.parseInt(s);
        }
        catch (Exception e) {
            // it is not an error to have no key...
            return defaultValue;
        }
    }

    /**
     * Get a boolean from the caller's package's LocalStrings.properties
     * @param indexString The string index into the localized string file
     * @return the integer value from LocalStrings or the supplied default if 
     * it doesn't exist or is bad.
     */
    public boolean getBoolean(String indexString, boolean defaultValue) {
        try {
            return new Boolean(getBundle().getString(indexString));
        }
        catch (Exception e) {
            // it is not an error to have no key...
            return defaultValue;
        }
    }

    ///////////////////////////////////////////////////////////////////////////
    ///////////////////////////////////////////////////////////////////////////
    private ResourceBundle getBundle() {
        return bundle;
    }

    ///////////////////////////////////////////////////////////////////////////
    private void setBundle() {
        // go through the stack, top to bottom.  The item that is below the LAST
        // method that is in the util framework is where the logfile is.
        // note that there may be more than one method from util in the stack
        // because they may be calling us indirectly from LoggerHelper.  Also
        // note that this class won't work from any class in the util hierarchy itself.

        try {
            StackTraceElement[] items = Thread.currentThread().getStackTrace();
            int lastMeOnStack = -1;

            for (int i = 0; i < items.length; i++) {
                StackTraceElement item = items[i];
                if (item.getClassName().startsWith(thisPackage)) {
                    lastMeOnStack = i;
                }
            }

            String className = items[lastMeOnStack + 1].getClassName();
            setBundle(className);
        }
        catch (Exception e) {
            bundle = null;
        }
    }

    ///////////////////////////////////////////////////////////////////////////

    private void setBundle(Class clazz) {

        try {
            String className = clazz.getName();
            setBundle(className);

            // April 25, 2009 -- if OSGi is in charge then we might not have got the
            // bundle!  Fix: send in the class's Classloader...
            if(bundle == null) {
                String props = className.substring(0, className.lastIndexOf('.')) + "." + propsName;
                bundle = ResourceBundle.getBundle(props, Locale.getDefault(), clazz.getClassLoader(),
                        rbcontrol);
            }
        }
        catch (Exception e) {
            bundle = null;
        }
    }

    ///////////////////////////////////////////////////////////////////////////

    private void setBundle(String className) {
        try {
            String props = className.substring(0, className.lastIndexOf('.')) + "." + propsName;
            bundle = ResourceBundle.getBundle(props, rbcontrol);
        }
        catch (Exception e) {
            bundle = null;
        }
    }

    ///////////////////////////////////////////////////////////////////////////
    private ResourceBundle bundle;
    private String propsName = "LocalStrings";
    private static final String thisPackage = "com.elf.util";
    private static final ResourceBundle.Control rbcontrol =
            ResourceBundle.Control.getControl(ResourceBundle.Control.FORMAT_PROPERTIES);
}

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