Java tutorial
/* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * https://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.context; import org.springframework.lang.Nullable; /** * Sub-interface of MessageSource to be implemented by objects that * can resolve messages hierarchically. * * @author Rod Johnson * @author Juergen Hoeller */ public interface HierarchicalMessageSource extends MessageSource { /** * Set the parent that will be used to try to resolve messages * that this object can't resolve. * @param parent the parent MessageSource that will be used to * resolve messages that this object can't resolve. * May be {@code null}, in which case no further resolution is possible. */ void setParentMessageSource(@Nullable MessageSource parent); /** * Return the parent of this MessageSource, or {@code null} if none. */ @Nullable MessageSource getParentMessageSource(); }