1. /*

  2.  * Copyright 2002-2004 the original author or authors.

  3.  * 

  4.  * Licensed under the Apache License, Version 2.0 (the "License");

  5.  * you may not use this file except in compliance with the License.

  6.  * You may obtain a copy of the License at

  7.  * 

  8.  *      http://www.apache.org/licenses/LICENSE-2.0

  9.  * 

  10.  * Unless required by applicable law or agreed to in writing, software

  11.  * distributed under the License is distributed on an "AS IS" BASIS,

  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  13.  * See the License for the specific language governing permissions and

  14.  * limitations under the License.

  15.  */ 

  16. 

  17. package org.springframework.context;

  18. 

  19. /**

  20.  * Sub-interface of MessageSource to be implemented by objects that

  21.  * can resolve messages hierarchically.

  22.  * @author Rod Johnson

  23.  * @author Juergen Hoeller

  24.  */

  25. public interface HierarchicalMessageSource extends MessageSource {

  26. 	

  27. 	/** 

  28. 	 * Set the parent that will be used to try to resolve messages

  29. 	 * that this object can't resolve.

  30. 	 * @param parent parent MessageSource that will be used to

  31. 	 * resolve messages that this object can't resolve.

  32. 	 * May be null, in which case no further resolution is possible.

  33. 	 */

  34. 	void setParentMessageSource(MessageSource parent);

  35. 

  36. 	/**

  37. 	 * Return the parent of this MessageSource, or null if none.

  38. 	 */

  39. 	MessageSource getParentMessageSource();

  40. 

  41. }