    001    // Copyright 2006, 2007, 2008, 2011 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
    015    package org.apache.tapestry5.internal.services;
    016
    017    import org.apache.tapestry5.ioc.Messages;
    018    import org.apache.tapestry5.services.InvalidationEventHub;
    019    import org.apache.tapestry5.services.UpdateListener;
    020    import org.apache.tapestry5.services.pageload.ComponentResourceSelector;
    021
    022    public interface MessagesSource extends InvalidationEventHub, UpdateListener
    023    {
    024        /**
    025         * Used to obtain a {@link Messages} instance for a particular component, within a particular locale. If the
    026         * component extends from another component, then its localized properties will merge with its parent's properties
    027         * (with the subclass overriding the super class on any conflicts).
    028         *
    029         * @param bundle
    030         *            defines the set of properties files to read, as well as a series of parent bundles to extend and
    031         *            override
    032         * @param selector
    033         *            defines the locale and other axes used to locate the necessary resources
    034         * @return the message catalog for the bundle, for the indicated selector
    035         */
    036        Messages getMessages(MessagesBundle bundle, ComponentResourceSelector selector);
    037    }