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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.xml.security.utils;

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

/**
 * The Internationalization (I18N) pack.
 *
 * @author Christian Geuer-Pollmann
 */
public class I18n {

    /** Field NOT_INITIALIZED_MSG */
    public static final String NOT_INITIALIZED_MSG =
        "You must initialize the xml-security library correctly before you use it. "
        + "Call the static method \"org.apache.xml.security.Init.init();\" to do that "
        + "before you use any functionality from that library.";

    /** Field resourceBundle */
    private static ResourceBundle resourceBundle;

    /** Field alreadyInitialized */
    private static boolean alreadyInitialized = false;

    /**
     * Constructor I18n
     *
     */
    private I18n() {
        // we don't allow instantiation
    }

    /**
     * Method translate
     *
     * translates a message ID into an internationalized String, see alse
     * XMLSecurityException.getExceptionMEssage(). The strings are
     * stored in the ResourceBundle, which is identified in
     * exceptionMessagesResourceBundleBase
     *
     * @param message
     * @param args is an Object[] array of strings which are inserted into 
     * the String which is retrieved from the ResouceBundle
     * @return message translated
     */
    public static String translate(String message, Object[] args) {
        return getExceptionMessage(message, args);
    }

    /**
     * Method translate
     *
     * translates a message ID into an internationalized String, see also
     * XMLSecurityException.getExceptionMessage()
     *
     * @param message
     * @return message translated
     */
    public static String translate(String message) {
        return getExceptionMessage(message);
    }

    /**
     * Method getExceptionMessage
     *
     * @param msgID
     * @return message translated
     *
     */
    public static String getExceptionMessage(String msgID) {
        try {
            return resourceBundle.getString(msgID);
        } catch (Throwable t) {
            if (org.apache.xml.security.Init.isInitialized()) {
                return "No message with ID \"" + msgID
                + "\" found in resource bundle \""
                + Constants.exceptionMessagesResourceBundleBase + "\"";
            } 
            return I18n.NOT_INITIALIZED_MSG;
        }
    }

    /**
     * Method getExceptionMessage
     *
     * @param msgID
     * @param originalException
     * @return message translated
     */
    public static String getExceptionMessage(String msgID, Exception originalException) {
        try {
            Object exArgs[] = { originalException.getMessage() };
            return MessageFormat.format(resourceBundle.getString(msgID), exArgs);
        } catch (Throwable t) {
            if (org.apache.xml.security.Init.isInitialized()) {
                return "No message with ID \"" + msgID
                + "\" found in resource bundle \""
                + Constants.exceptionMessagesResourceBundleBase
                + "\". Original Exception was a "
                + originalException.getClass().getName() + " and message "
                + originalException.getMessage();
            } 
            return I18n.NOT_INITIALIZED_MSG;
        }
    }

    /**
     * Method getExceptionMessage
     *
     * @param msgID
     * @param exArgs
     * @return message translated
     */
    public static String getExceptionMessage(String msgID, Object exArgs[]) {
        try {
            return MessageFormat.format(resourceBundle.getString(msgID), exArgs);
        } catch (Throwable t) {
            if (org.apache.xml.security.Init.isInitialized()) {
                return "No message with ID \"" + msgID
                + "\" found in resource bundle \""
                + Constants.exceptionMessagesResourceBundleBase + "\"";
            } 
            return I18n.NOT_INITIALIZED_MSG;
        }
    }
    
    /**
     * Method init
     *
     * @param languageCode
     * @param countryCode
     */
    public synchronized static void init(String languageCode, String countryCode) {
        if (alreadyInitialized) {
            return;
        }

        I18n.resourceBundle =
            ResourceBundle.getBundle(
                Constants.exceptionMessagesResourceBundleBase,
                new Locale(languageCode, countryCode)
            );
        alreadyInitialized = true;
    }
}