content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.cli.hdfs;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Parser for configuration files.
   */
  public class HadoopConfigurationFileParser {
    /**
     * Constructs a {@link HadoopConfigurationFileParser} object.
     */
    public HadoopConfigurationFileParser() {}
  
    /**
     * Parse an xml configuration file into a map.
     *
     * Referred to https://www.mkyong.com/java/how-to-read-xml-file-in-java-dom-parser/
     *
     * @param path path to the xml file
     * @return Map from property names to values
     */
    public Map<String, String> parseXmlConfiguration(final String path) throws IOException {
      File xmlFile;
      xmlFile = new File(path);
      if (!xmlFile.exists()) {
        throw new IOException(String.format("File %s does not exist.", path));
      }
      org.apache.hadoop.conf.Configuration c = new org.apache.hadoop.conf.Configuration(false);
      c.addResource(Files.newInputStream(Paths.get(path)));
      Map<String, String> properties = new HashMap<>();
      c.iterator().forEachRemaining(e -> properties.put(e.getKey(), e.getValue()));
      return properties;
    }
  }
  