001// Copyright 2006 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.ioc.internal.util;
016
017import org.apache.tapestry5.ioc.Messages;
018import org.apache.tapestry5.ioc.util.AbstractMessages;
019
020import java.util.Enumeration;
021import java.util.Locale;
022import java.util.Map;
023import java.util.ResourceBundle;
024
025/**
026 * Implementation of {@link org.apache.tapestry5.ioc.Messages} based around a {@link java.util.ResourceBundle}.
027 */
028public class MessagesImpl extends AbstractMessages
029{
030    private final Map<String, String> properties = CollectionFactory.newCaseInsensitiveMap();
031
032    /**
033     * Finds the messages for a given Messages utility class. Strings the trailing "Messages" and replaces it with
034     * "Strings" to form the base path. Loads the bundle using the default locale, and the class' class loader.
035     *
036     * @param forClass
037     * @return Messages for the class
038     */
039    public static Messages forClass(Class forClass)
040    {
041        String className = forClass.getName();
042        String stringsClassName = className.replaceAll("Messages$", "Strings");
043
044        Locale locale = Locale.getDefault();
045
046        ResourceBundle bundle = ResourceBundle.getBundle(stringsClassName, locale, forClass.getClassLoader());
047
048        return new MessagesImpl(locale, bundle);
049    }
050
051    public MessagesImpl(Locale locale, ResourceBundle bundle)
052    {
053        super(locale);
054
055        // Our best (threadsafe) chance to determine all the available keys.
056        Enumeration<String> e = bundle.getKeys();
057        while (e.hasMoreElements())
058        {
059            String key = e.nextElement();
060            String value = bundle.getString(key);
061
062            properties.put(key, value);
063        }
064    }
065
066    @Override
067    protected String valueForKey(String key)
068    {
069        return properties.get(key);
070    }
071
072}