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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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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.xerces.impl.msg;

import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.apache.xerces.util.MessageFormatter;

/**
 * XMLMessageFormatter provides error messages for the XML 1.0 Recommendation and for 
 * the Namespaces Recommendation
 * 
 * @xerces.internal
 *
 * @author Eric Ye, IBM
 * @version $Id: XMLMessageFormatter.java 813087 2009-09-09 19:35:27Z mrglavas $
 *
 */
public class XMLMessageFormatter implements MessageFormatter {
    /**
     * The domain of messages concerning the XML 1.0 specification.
     */
    public static final String XML_DOMAIN = "http://www.w3.org/TR/1998/REC-xml-19980210";
    public static final String XMLNS_DOMAIN = "http://www.w3.org/TR/1999/REC-xml-names-19990114";

    // private objects to cache the locale and resource bundle
    private Locale fLocale = null;
    private ResourceBundle fResourceBundle = null;
    
    //
    // MessageFormatter methods
    //

    /**
     * Formats a message with the specified arguments using the given
     * locale information.
     * 
     * @param locale    The locale of the message.
     * @param key       The message key.
     * @param arguments The message replacement text arguments. The order
     *                  of the arguments must match that of the placeholders
     *                  in the actual message.
     * 
     * @return Returns the formatted message.
     *
     * @throws MissingResourceException Thrown if the message with the
     *                                  specified key cannot be found.
     */
    public String formatMessage(Locale locale, String key, Object[] arguments) 
        throws MissingResourceException {
        
        if (locale == null) {
            locale = Locale.getDefault();
        }
        if (locale != fLocale) {
            fResourceBundle = ResourceBundle.getBundle("org.apache.xerces.impl.msg.XMLMessages", locale);
            // memorize the most-recent locale
            fLocale = locale;
        }
        
        // format message
        String msg;
        try {
            msg = fResourceBundle.getString(key);
            if (arguments != null) {
                try {
                    msg = java.text.MessageFormat.format(msg, arguments);
                } 
                catch (Exception e) {
                    msg = fResourceBundle.getString("FormatFailed");
                    msg += " " + fResourceBundle.getString(key);
                }
            } 
        }

        // error
        catch (MissingResourceException e) {
            msg = fResourceBundle.getString("BadMessageKey");
            throw new MissingResourceException(key, msg, key);
        }

        // no message
        if (msg == null) {
            msg = key;
            if (arguments.length > 0) {
                StringBuffer str = new StringBuffer(msg);
                str.append('?');
                for (int i = 0; i < arguments.length; i++) {
                    if (i > 0) {
                        str.append('&');
                    }
                    str.append(String.valueOf(arguments[i]));
                }
            }
        }

        return msg;
    }

}