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.internal.services;
016
017import org.apache.tapestry5.ioc.Messages;
018import org.apache.tapestry5.ioc.Resource;
019
020/**
021 * Represents a bundle of properties files that can be used to collect properties that are eventually used to form a
022 * {@link Messages}.
023 */
024public interface MessagesBundle
025{
026
027    /**
028     * Returns an object used to identify this particular bundle; this should be a simple immutable value such as a
029     * String.
030     */
031    Object getId();
032
033    /**
034     * Returns the base resource for this bundle of properties files.
035     */
036    Resource getBaseResource();
037
038    /**
039     * Returns a parent bundle for this bundle, or null if this bundle has no parent. Parent bundle provide properties
040     * that are overridden by child bundles.
041     */
042    MessagesBundle getParent();
043}