    001// Copyright 2006, 2012 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.*;
    021
    022/**
    023 * Implementation of {@link org.apache.tapestry5.ioc.Messages} based around a {@link java.util.ResourceBundle}.
    024 */
    025public class MessagesImpl extends AbstractMessages
    026{
    027    private final Map<String, String> properties = CollectionFactory.newCaseInsensitiveMap();
    028
    029    /**
    030     * Finds the messages for a given Messages utility class. Strings the trailing "Messages" and replaces it with
    031     * "Strings" to form the base path. Loads the bundle using the default locale, and the class' class loader.
    032     *
    033     * @param forClass
    034     * @return Messages for the class
    035     */
    036    public static Messages forClass(Class forClass)
    037    {
    038        String className = forClass.getName();
    039        String stringsClassName = className.replaceAll("Messages$", "Strings");
    040
    041        Locale locale = Locale.getDefault();
    042
    043        ResourceBundle bundle = ResourceBundle.getBundle(stringsClassName, locale, forClass.getClassLoader());
    044
    045        return new MessagesImpl(locale, bundle);
    046    }
    047
    048    public MessagesImpl(Locale locale, ResourceBundle bundle)
    049    {
    050        super(locale);
    051
    052        // Our best (threadsafe) chance to determine all the available keys.
    053        Enumeration<String> e = bundle.getKeys();
    054        while (e.hasMoreElements())
    055        {
    056            String key = e.nextElement();
    057            String value = bundle.getString(key);
    058
    059            properties.put(key, value);
    060        }
    061    }
    062
    063    @Override
    064    protected String valueForKey(String key)
    065    {
    066        return properties.get(key);
    067    }
    068
    069    @Override
    070    public Set<String> getKeys()
    071    {
    072        return properties.keySet();
    073    }
    074}