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 com.alipay.api.config.filter;
  
  
  import com.alipay.api.config.MessageConfig;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  import org.springframework.context.i18n.LocaleContextHolder;
  import org.springframework.stereotype.Component;
  import org.springframework.web.servlet.HandlerInterceptor;
  
  import java.util.Enumeration;
  import java.util.Locale;
  
  /*
   *@title LangContextInterceptor
   *@description
   *@author jietian
   *@version 1.0
   *@create 2025/3/4 11:37
   */
  @Component
  public class LangContextInterceptor implements HandlerInterceptor {
  
      @Override
      public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
          Enumeration<String> headerNames = request.getHeaderNames();
          String language = null;
          Locale locale= Locale.getDefault();
          while (headerNames.hasMoreElements()) {
              String headerName = headerNames.nextElement();
              if (MessageConfig.lang.equalsIgnoreCase(headerName)) {
                  language = request.getHeader(headerName);
                  locale = Locale.forLanguageTag(language);
                  break;
              }
          }
  
          LocaleContextHolder.setLocale(locale);
          return true;
      }
  }
  