content: /*
   *
   *  Licensed to the Apache Software Foundation (ASF) under one or more
   *  contributor license agreements.  See the NOTICE file distributed with
   *  this work for additional information regarding copyright ownership.
   *  The ASF licenses this file to You 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.dinky.interceptor;
  
  import org.dinky.assertion.Asserts;
  import org.dinky.data.constant.BaseConstant;
  import org.dinky.utils.I18n;
  
  import java.util.Locale;
  
  import javax.servlet.http.Cookie;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.springframework.context.i18n.LocaleContextHolder;
  import org.springframework.lang.Nullable;
  import org.springframework.util.StringUtils;
  import org.springframework.web.servlet.AsyncHandlerInterceptor;
  import org.springframework.web.util.WebUtils;
  
  public class LocaleChangeInterceptor implements AsyncHandlerInterceptor {
  
      @Override
      public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
          Cookie cookie = WebUtils.getCookie(request, BaseConstant.LOCALE_LANGUAGE_COOKIE);
          if (Asserts.isNotNull(cookie)) {
              // Proceed in cookie
              LocaleContextHolder.setLocale(parseLocaleValue(cookie.getValue()));
              I18n.setLocale(LocaleContextHolder.getLocale());
          }
          // Proceed in header
          String newLocale = request.getHeader(BaseConstant.LOCALE_LANGUAGE_COOKIE);
          if (Asserts.isNotNull(newLocale)) {
              LocaleContextHolder.setLocale(parseLocaleValue(newLocale));
              I18n.setLocale(LocaleContextHolder.getLocale());
          }
          return true;
      }
  
      @Nullable
      protected Locale parseLocaleValue(String localeValue) {
          return StringUtils.parseLocale(localeValue);
      }
  }
  