content: /*
   * Copyright 1999-2023 Alibaba Group Holding Ltd.
   *
   * 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 com.alibaba.nacos.sys.filter;
  
  import com.alibaba.nacos.common.spi.NacosServiceLoader;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.core.type.classreading.MetadataReader;
  import org.springframework.core.type.classreading.MetadataReaderFactory;
  import org.springframework.core.type.filter.TypeFilter;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Nacos server execute filter. To exclude some beans or features by config
   *
   * @author xiweng.yy
   */
  public class NacosTypeExcludeFilter implements TypeFilter {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(NacosTypeExcludeFilter.class);
      
      private final Map<String, NacosPackageExcludeFilter> packageExcludeFilters;
      
      public NacosTypeExcludeFilter() {
          this.packageExcludeFilters = new HashMap<>(2);
          for (NacosPackageExcludeFilter each : NacosServiceLoader.load(NacosPackageExcludeFilter.class)) {
              packageExcludeFilters.put(each.getResponsiblePackagePrefix(), each);
              LOGGER.info("Load Nacos package exclude filter success, package prefix {}, filter {}",
                      each.getResponsiblePackagePrefix(), each.getClass().getCanonicalName());
          }
      }
      
      @Override
      public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory)
              throws IOException {
          // If no exclude filters, all classes should be load.
          if (packageExcludeFilters.isEmpty()) {
              return false;
          }
          boolean isSpringBootApplication = metadataReader.getAnnotationMetadata()
                  .hasAnnotation(SpringBootApplication.class.getCanonicalName());
          String className = metadataReader.getClassMetadata().getClassName();
          if (isSpringBootApplication) {
              LOGGER.info("Skip @SpringBootApplication annotation for class {} to avoid duplicate scan", className);
              return true;
          }
          for (Map.Entry<String, NacosPackageExcludeFilter> entry : packageExcludeFilters.entrySet()) {
              // If match the package exclude filter, judged by filter.
              if (className.startsWith(entry.getKey())) {
                  Set<String> annotations = metadataReader.getAnnotationMetadata().getAnnotationTypes();
                  return entry.getValue().isExcluded(className, annotations);
              }
          }
          // No match filter, load class
          return false;
      }
  }
  