code: /*
   * 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 org.apache.skywalking.oap.server.receiver.zabbix.provider.config;
  
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.library.module.ModuleStartException;
  import org.apache.skywalking.oap.server.library.util.CollectionUtils;
  import org.apache.skywalking.oap.server.library.util.ResourceUtils;
  import org.yaml.snakeyaml.Yaml;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  import java.io.IOException;
  import java.io.Reader;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import java.util.Objects;
  import java.util.stream.Collectors;
  
  @Slf4j
  public class ZabbixConfigs {
  
      public static List<ZabbixConfig> loadConfigs(String path, List<String> fileNames) throws ModuleStartException {
          if (CollectionUtils.isEmpty(fileNames)) {
              return Collections.emptyList();
          }
  
          File[] configs;
          try {
              configs = ResourceUtils.getPathFiles(path);
          } catch (FileNotFoundException e) {
              throw new ModuleStartException("Load zabbix configs failed", e);
          }
  
          return Arrays.stream(configs).filter(File::isFile)
              .map(f -> {
                  String fileName = f.getName();
                  int dotIndex = fileName.lastIndexOf('.');
                  fileName = (dotIndex == -1) ? fileName : fileName.substring(0, dotIndex);
                  if (!fileNames.contains(fileName)) {
                      return null;
                  }
                  try (Reader r = new FileReader(f)) {
                      return new Yaml().<ZabbixConfig>loadAs(r, ZabbixConfig.class);
                  } catch (IOException e) {
                      log.warn("Reading file {} failed", f, e);
                  }
                  return null;
              })
              .filter(Objects::nonNull)
              .collect(Collectors.toList());
      }
  }
  