/*
 *  Copyright 2008 biaoping.yin
 *
 *  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
 *
 *      http://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.frameworkset.spi.support;

import java.util.Locale;




/**
 * <p>Title: MessageSource.java</p> 
 * <p>Description: </p>
 * <p>bboss workgroup</p>
 * <p>Copyright (c) 2007</p>
 * @Date 2010-9-24 下午04:52:43
 * @author biaoping.yin
 * @version 1.0
 */
public interface MessageSource {
	/**
	 * Try to resolve the message. Return default message if no message was found.
	 * @param code the code to lookup up, such as 'calculator.noRateSet'. Users of
	 * this class are encouraged to base message names on the relevant fully
	 * qualified class name, thus avoiding conflict and ensuring maximum clarity.
	 * @param args array of arguments that will be filled in for params within
	 * the message (params look like "{0}", "{1,date}", "{2,time}" within a message),
	 * or <code>null</code> if none.
	 * @param defaultMessage String to return if the lookup fails
	 * @param locale the Locale in which to do the lookup
	 * @return the resolved message if the lookup was successful;
	 * otherwise the default message passed as a parameter
	 * @see java.text.MessageFormat
	 */
	String getMessage(String code, Object[] args, String defaultMessage, Locale locale);

	/**
	 * Try to resolve the message. Treat as an error if the message can't be found.
	 * @param code the code to lookup up, such as 'calculator.noRateSet'
	 * @param args Array of arguments that will be filled in for params within
	 * the message (params look like "{0}", "{1,date}", "{2,time}" within a message),
	 * or <code>null</code> if none.
	 * @param locale the Locale in which to do the lookup
	 * @return the resolved message
	 * @throws NoSuchMessageException if the message wasn't found
	 * @see java.text.MessageFormat
	 */
	String getMessage(String code, Object[] args, Locale locale) throws NoSuchMessageException;
	String getMessage(String code) throws NoSuchMessageException;
	String getMessage(String code,Locale locale) throws NoSuchMessageException;

	/**
	 * Try to resolve the message using all the attributes contained within the
	 * <code>MessageSourceResolvable</code> argument that was passed in.
	 * <p>NOTE: We must throw a <code>NoSuchMessageException</code> on this method
	 * since at the time of calling this method we aren't able to determine if the
	 * <code>defaultMessage</code> property of the resolvable is null or not.
	 * @param resolvable value object storing attributes required to properly resolve a message
	 * @param locale the Locale in which to do the lookup
	 * @return the resolved message
	 * @throws NoSuchMessageException if the message wasn't found
	 * @see java.text.MessageFormat
	 */
	String getMessage(MessageSourceResolvable resolvable, Locale locale) throws NoSuchMessageException;

}