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;
  
  import alluxio.ProjectConstants;
  import alluxio.RuntimeConstants;
  import alluxio.annotation.PublicApi;
  
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.CommandLineParser;
  import org.apache.commons.cli.DefaultParser;
  import org.apache.commons.cli.HelpFormatter;
  import org.apache.commons.cli.Option;
  import org.apache.commons.cli.Options;
  import org.apache.commons.cli.ParseException;
  
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * The version of the current build.
   */
  @ThreadSafe
  @PublicApi
  public final class Version {
  
    private static final Option REVISION_OPT = Option.builder("r")
        .longOpt("revision")
        .desc("Prints the git revision along with the Alluxio version. Optionally specify the "
            + "revision length")
        .optionalArg(true)
        .argName("revision_length")
        .hasArg(true)
        .build();
  
    private Version() {} // prevent instantiation
  
    /**
     * Prints the version of the current build.
     *
     * @param args the arguments
     */
    public static void main(String[] args) {
      CommandLineParser parser = new DefaultParser();
      Options opts = new Options().addOption(REVISION_OPT);
      try {
        CommandLine cl = parser.parse(opts, args);
        String revision = "";
        if (cl.hasOption(REVISION_OPT.getOpt())) {
          String r = cl.getOptionValue(REVISION_OPT.getOpt());
          int revisionLen = r == null ? ProjectConstants.REVISION.length() :
              Integer.parseInt(r);
          revision = String.format("-%s", ProjectConstants.REVISION.substring(0,
              Math.min(revisionLen, ProjectConstants.REVISION.length())));
        }
        System.out.printf("%s%s%n", RuntimeConstants.VERSION, revision);
        System.exit(0);
      } catch (ParseException e) {
        printUsage(opts);
      } catch (NumberFormatException e) {
        System.out.println(String.format("Couldn't parse <%s> as an integer",
            REVISION_OPT.getValue()));
        printUsage(opts);
      }
      System.exit(1);
    }
  
    /**
     * Prints the usage of the version command.
     *
     * @param options the set of command line options to put in the help text
     */
    public static void printUsage(Options options) {
      new HelpFormatter().printHelp("version", options);
    }
  }
  