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.core.template.loader;
  
  import com.alibaba.initializer.core.constants.ErrorCodeEnum;
  import com.alibaba.initializer.core.exception.BizRuntimeException;
  import com.alibaba.initializer.core.template.CodeTemplate;
  import com.alibaba.initializer.core.template.CodeTemplateRepo;
  import com.alibaba.initializer.core.template.CodeTemplateRepoLoader;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.context.ApplicationContext;
  import org.springframework.core.io.Resource;
  import static org.springframework.util.ResourceUtils.JAR_URL_SEPARATOR;
  
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.Reader;
  import java.net.URI;
  import java.net.URL;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import java.util.stream.Collectors;
  
  /**
   * load template file from classpath
   *
   * @author <a href="mailto:chenxilzx1@gmail.com">theonefx</a>
   */
  public class ClasspathTemplateLoader implements CodeTemplateRepoLoader {
  
      private static final String CLASSPAHT_PREFIX = "classpath:";
  
      @Autowired
      private ApplicationContext resourceLoader;
  
      @Override
      public CodeTemplateRepo load(String uriStr) {
          try {
              URI uri = new URI(uriStr);
  
              Path rootPath = Paths.get(uri.getPath());
  
              Resource rootResource = resourceLoader.getResource(CLASSPAHT_PREFIX + rootPath);
              if (!rootResource.exists()) {
                  return new CodeTemplateRepo(uri, Collections.emptyList());
              }
  
              Resource[] resources = resourceLoader.getResources(CLASSPAHT_PREFIX + rootPath + "/**");
  
              List<CodeTemplate> templates = Arrays.stream(resources)
                      .filter(Resource::isReadable)
                      .map(item -> toTemplate(item, rootPath))
                      .collect(Collectors.toList());
  
              return new CodeTemplateRepo(uri, templates);
          } catch (Exception e) {
              throw new BizRuntimeException(ErrorCodeEnum.SYSTEM_ERROR, "load template error", e);
          }
      }
  
      private CodeTemplate toTemplate(Resource resource, Path scanRootPath) {
  
          try {
              URL url = resource.getURL();
  
              String urlFile = url.getFile();
  
              int separatorIndex = urlFile.lastIndexOf(JAR_URL_SEPARATOR);
  
              if (separatorIndex > -1) {
                  urlFile = urlFile.substring(separatorIndex + 1);
              } else {
                  String classpathPath = ClasspathTemplateLoader.class.getProtectionDomain().getCodeSource().getLocation().getPath();
                  urlFile = urlFile.startsWith(classpathPath) ? urlFile.replace(classpathPath, "/") : urlFile;
              }
  
              Path entryPath = Paths.get(urlFile);
              String fileName = entryPath.getFileName().toString();
  
              Path relativePath = entryPath.subpath(scanRootPath.getNameCount(), entryPath.getNameCount());
              Path relativeFolderPath = relativePath.getNameCount() == 1
                      ? null
                      : relativePath.subpath(0,
                      relativePath.getNameCount() - 1);
  
              return new CodeTemplate(relativeFolderPath, fileName) {
                  @Override
                  public Reader getReader() throws IOException {
                      return new InputStreamReader(resource.getInputStream());
                  }
              };
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      @Override
      public String getProtocol() {
          return "classpath";
      }
  }
  