001/*
002 * Copyright 2002-2012 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.context;
018
019/**
020 * Sub-interface of MessageSource to be implemented by objects that
021 * can resolve messages hierarchically.
022 *
023 * @author Rod Johnson
024 * @author Juergen Hoeller
025 */
026public interface HierarchicalMessageSource extends MessageSource {
027
028        /**
029         * Set the parent that will be used to try to resolve messages
030         * that this object can't resolve.
031         * @param parent the parent MessageSource that will be used to
032         * resolve messages that this object can't resolve.
033         * May be {@code null}, in which case no further resolution is possible.
034         */
035        void setParentMessageSource(MessageSource parent);
036
037        /**
038         * Return the parent of this MessageSource, or {@code null} if none.
039         */
040        MessageSource getParentMessageSource();
041
042}