/*
 * Copyright 2002-2004 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
 * 
 *      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.springframework.web.servlet.i18n;

import java.util.Locale;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.LocaleResolver;

/**
 * Implementation of LocaleResolver that simply uses the primary locale
 * specified in the "accept-language" header of the HTTP request
 * (i.e., the locale sent by the client browser, normally that of the client's OS).
 *
 * <p>Note: Does not support setLocale, because the accept header cannot be changed.
 *
 * @author Juergen Hoeller
 * @since 27.02.2003
 */
public class AcceptHeaderLocaleResolver implements LocaleResolver {

	public Locale resolveLocale(HttpServletRequest request) {
		return request.getLocale();
	}

	public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
		throw new IllegalArgumentException("Cannot change HTTP accept header - use a different locale resolution strategy");
	}
	
}
