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.fs.command;
  
  import alluxio.AlluxioURI;
  import alluxio.cli.CommandUtils;
  import alluxio.client.file.FileSystemContext;
  import alluxio.client.file.URIStatus;
  import alluxio.exception.AlluxioException;
  import alluxio.exception.status.InvalidArgumentException;
  
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.Option;
  import org.apache.commons.cli.Options;
  
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Tests properties of the path specified in args.
   */
  @ThreadSafe
  public final class TestCommand extends AbstractFileSystemCommand {
  
    private static final Option DIR_OPTION =
        Option.builder("d")
            .required(false)
            .hasArg(false)
            .desc("test whether path is a directory.")
            .build();
    private static final Option FILE_OPTION =
        Option.builder("f")
            .required(false)
            .hasArg(false)
            .desc("test whether path is a file.")
            .build();
    private static final Option PATH_EXIST_OPTION =
        Option.builder("e")
            .required(false)
            .hasArg(false)
            .desc("test whether path exists.")
            .build();
    private static final Option DIR_NOT_EMPTY_OPTION =
        Option.builder("s")
            .required(false)
            .hasArg(false)
            .desc("test whether path is not empty.")
            .build();
    private static final Option FILE_ZERO_LENGTH_OPTION =
        Option.builder("z")
            .required(false)
            .hasArg(false)
            .desc("test whether file is zero length.")
            .build();
  
    /**
     * @param fsContext the filesystem of Alluxio
     */
    public TestCommand(FileSystemContext fsContext) {
      super(fsContext);
    }
  
    @Override
    public String getCommandName() {
      return "test";
    }
  
    @Override
    public void validateArgs(CommandLine cl) throws InvalidArgumentException {
      CommandUtils.checkNumOfArgsEquals(this, cl, 1);
    }
  
    @Override
    public Options getOptions() {
      return new Options()
          .addOption(DIR_OPTION)
          .addOption(FILE_OPTION)
          .addOption(PATH_EXIST_OPTION)
          .addOption(DIR_NOT_EMPTY_OPTION)
          .addOption(FILE_ZERO_LENGTH_OPTION);
    }
  
    /**
     * Tests whether the path is a directory.
     *
     * @param status the {@link URIStatus} status as the input of the command
     * @return true if the path is a directory or false if it is not a directory
     */
    private boolean isDir(URIStatus status) {
      return status.isFolder();
    }
  
    /**
     * Tests whether the path is a file.
     *
     * @param status the {@link URIStatus} status as the input of the command
     * @return true if the path is a file or false if it is not a file
     */
    private boolean isFile(URIStatus status) {
      return !status.isFolder();
    }
  
    /**
     * Tests whether the directory is not empty.
     *
     * @param status the {@link URIStatus} status as the input of the command
     * @return true if the directory is not empty or false if it is empty
     */
    private boolean isNonEmptyDir(URIStatus status) {
      return status.isFolder() && status.getLength() > 0;
    }
  
    /**
     * Tests whether the file is zero length.
     *
     * @param status the {@link URIStatus} status as the input of the command
     * @return true if the file is zero length or false if it is not zero length
     */
    private boolean isZeroLengthFile(URIStatus status) {
      return !status.isFolder() && status.getLength() == 0;
    }
  
    @Override
    public int run(CommandLine cl) throws AlluxioException, IOException {
      if (cl.getOptions().length > 1) {
        return -1;
      }
      String[] args = cl.getArgs();
      AlluxioURI path = new AlluxioURI(args[0]);
      try {
        URIStatus status = mFileSystem.getStatus(path);
        boolean testResult = false;
        if (cl.hasOption("d")) {
          if (isDir(status)) {
            testResult = true;
          }
        } else if (cl.hasOption("f")) {
          if (isFile(status)) {
            testResult = true;
          }
        } else if (cl.hasOption("e")) {
          testResult = true;
        } else if (cl.hasOption("s")) {
          if (isNonEmptyDir(status)) {
            testResult = true;
          }
        } else if (cl.hasOption("z")) {
          if (isZeroLengthFile(status)) {
            testResult = true;
          }
        } else {
          return -1;
        }
        return testResult ? 0 : 1;
      } catch (FileNotFoundException e) {
        return 1;
      } catch (IOException e) {
        return 2;
      } catch (AlluxioException e) {
        return 3;
      }
    }
  
    @Override
    public String getUsage() {
      return "test [-d|-f|-e|-s|-z] <path>";
    }
  
    @Override
    public String getDescription() {
      return "Test a property of a path, returning 0 if the property is true, or 1 otherwise.";
    }
  }
  