content: /*
   * Copyright 2022-2023 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
   *
   *      https://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.alibaba.initializer.protocol.resolver;
  
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.util.List;
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  
  import com.alibaba.initializer.core.ProjectGenerationRequest;
  import com.google.common.base.Joiner;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.context.ApplicationContext;
  import org.springframework.core.annotation.AnnotationAwareOrderComparator;
  
  /**
   * @author <a href="mailto:chenxilzx1@gmail.com">theonefx</a>
   */
  public class RequestConverter {
  
      @Autowired
      private ApplicationContext applicationContext;
  
      private List<IRequestPathValve> converters;
  
      public ProjectGenerationRequest convert(HttpServletRequest request) {
          ProjectGenerationRequest projReq = new ProjectGenerationRequest();
  
          parseParameterFromParameterAndHeader(projReq, request);
  
          List<IRequestPathValve> converters = getConvertors();
  
          Path paths = Paths.get(request.getRequestURI());
  
          for (IRequestPathValve converter : converters) {
              converter.invoke(paths, projReq);
          }
  
          return projReq;
      }
  
      private List<IRequestPathValve> getConvertors() {
          if (converters == null) {
              synchronized (this) {
                  if (converters == null) {
                      Map<String, IRequestPathValve> map = applicationContext.getBeansOfType(IRequestPathValve.class);
                      List<IRequestPathValve> tmp = new ArrayList<>(map.values());
                      AnnotationAwareOrderComparator.sort(tmp);
                      converters = tmp;
                  }
              }
          }
  
          return converters;
      }
  
      private void parseParameterFromParameterAndHeader(ProjectGenerationRequest projReq, HttpServletRequest httpRequest) {
          // param from header
          Enumeration<String> iter = httpRequest.getHeaderNames();
          while (iter.hasMoreElements()) {
              String key = iter.nextElement();
              String value = httpRequest.getHeader(key);
              projReq.setParam(key, value);
          }
  
          // param from request param
          iter = httpRequest.getParameterNames();
          while (iter.hasMoreElements()) {
              String key = iter.nextElement();
              String[] values = httpRequest.getParameterValues(key);
              if (values == null || values.length == 0) {
                  continue;
              }
              String value = Joiner.on(',').join(values);
              projReq.setParam(key, value);
          }
      }
  }
  