content: /*
   * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
   * 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 me.ahoo.cosid.accessor.scanner;
  
  import me.ahoo.cosid.CosIdException;
  import me.ahoo.cosid.accessor.CosIdAccessor;
  import me.ahoo.cosid.accessor.parser.CosIdAccessorParser;
  import me.ahoo.cosid.accessor.parser.DefaultAccessorParser;
  import me.ahoo.cosid.accessor.parser.FieldDefinitionParser;
  import me.ahoo.cosid.accessor.registry.CosIdAccessorRegistry;
  
  import com.google.common.collect.ImmutableSet;
  import com.google.common.reflect.ClassPath;
  import lombok.extern.slf4j.Slf4j;
  
  import java.io.IOException;
  import java.util.Arrays;
  
  /**
   * Default {@link CosIdScanner} implementation.
   *
   * @author ahoo wang
   */
  @Slf4j
  public class DefaultCosIdScanner implements CosIdScanner {
  
      private final String[] basePackages;
      private final CosIdAccessorParser cosIdAccessorParser;
      private final CosIdAccessorRegistry cosIdAccessorRegistry;
  
      public DefaultCosIdScanner(String[] basePackages, FieldDefinitionParser fieldDefinitionParser, CosIdAccessorRegistry cosIdAccessorRegistry) {
          this(basePackages, new DefaultAccessorParser(fieldDefinitionParser), cosIdAccessorRegistry);
      }
  
      public DefaultCosIdScanner(String[] basePackages, CosIdAccessorParser cosIdAccessorParser, CosIdAccessorRegistry cosIdAccessorRegistry) {
          this.basePackages = basePackages;
          this.cosIdAccessorRegistry = cosIdAccessorRegistry;
          this.cosIdAccessorParser = cosIdAccessorParser;
      }
  
      @Override
      public void scan() {
          if (log.isInfoEnabled()) {
              log.info("Scan basePackages:{}.", Arrays.toString(basePackages));
          }
          try {
              ClassLoader classLoader = getClass().getClassLoader();
              ClassPath classPath = ClassPath.from(classLoader);
              for (String basePackage : basePackages) {
  
                  ImmutableSet<ClassPath.ClassInfo> classInfos = classPath.getTopLevelClassesRecursive(basePackage);
                  for (ClassPath.ClassInfo classInfo : classInfos) {
                      Class<?> clazz = classLoader.loadClass(classInfo.getName());
                      if (clazz.isInterface()) {
                          continue;
                      }
                      CosIdAccessor cosIdAccessor = cosIdAccessorParser.parse(clazz);
                      cosIdAccessorRegistry.register(clazz, cosIdAccessor);
                  }
              }
          } catch (IOException | ClassNotFoundException e) {
              throw new CosIdException(e.getMessage(), e);
          }
      }
  }
  