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.fsadmin.pathconf;
  
  import alluxio.AlluxioURI;
  import alluxio.cli.CommandUtils;
  import alluxio.cli.fsadmin.command.AbstractFsAdminCommand;
  import alluxio.cli.fsadmin.command.Context;
  import alluxio.conf.AlluxioConfiguration;
  import alluxio.conf.AlluxioProperties;
  import alluxio.conf.InstancedConfiguration;
  import alluxio.conf.PropertyKey;
  import alluxio.conf.path.PathConfiguration;
  import alluxio.exception.status.InvalidArgumentException;
  import alluxio.grpc.GetConfigurationPOptions;
  import alluxio.wire.Configuration;
  import alluxio.wire.Property;
  
  import com.google.common.annotations.VisibleForTesting;
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.Option;
  import org.apache.commons.cli.Options;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Show path level configurations.
   *
   * <p>
   * It has two modes:
   * 1. without option "--all", only show configurations for the specific path;
   * 2. with option "--all", show all configurations applicable to the path.
   * <p>
   * For example, suppose there are two path level configurations:
   * /a: property1=value1
   * /a/b: property2=value2
   * Then in mode 1, only property2=value2 will be shown for /a/b,
   * but in mode 2, since /a is the prefix of /a/b, both properties will be shown for /a/b.
   */
  public final class ShowCommand extends AbstractFsAdminCommand {
    public static final String ALL_OPTION_NAME = "all";
  
    private static final Option ALL_OPTION =
        Option.builder()
            .longOpt(ALL_OPTION_NAME)
            .required(false)
            .hasArg(false)
            .desc("Whether to show all path level configurations applicable to the path, including"
                + " those set on ancestor paths")
            .build();
  
    /**
     * @param context fsadmin command context
     * @param alluxioConf Alluxio configuration
     */
    public ShowCommand(Context context, AlluxioConfiguration alluxioConf) {
      super(context);
    }
  
    @Override
    public String getCommandName() {
      return "show";
    }
  
    @Override
    public Options getOptions() {
      return new Options().addOption(ALL_OPTION);
    }
  
    @Override
    public void validateArgs(CommandLine cl) throws InvalidArgumentException {
      CommandUtils.checkNumOfArgsEquals(this, cl, 1);
    }
  
    private String format(String key, Object value) {
      return key + "=" + value;
    }
  
    @Override
    public int run(CommandLine cl) throws IOException {
      String targetPath = cl.getArgs()[0];
      Configuration configuration = mMetaConfigClient.getConfiguration(
          GetConfigurationPOptions.getDefaultInstance());
  
      if (cl.hasOption(ALL_OPTION_NAME)) {
        Map<String, AlluxioConfiguration> pathConfMap = new HashMap<>();
  
        configuration.getPathConf().forEach((path, conf) -> {
          AlluxioProperties properties = new AlluxioProperties();
          conf.forEach(property -> {
            PropertyKey key = PropertyKey.fromString(property.getName());
            properties.set(key, property.getValue());
          });
          pathConfMap.put(path, new InstancedConfiguration(properties));
        });
        PathConfiguration pathConf = PathConfiguration.create(pathConfMap);
  
        AlluxioURI targetUri = new AlluxioURI(targetPath);
        List<PropertyKey> propertyKeys = new ArrayList<>(pathConf.getPropertyKeys(targetUri));
        propertyKeys.sort(Comparator.comparing(PropertyKey::getName));
        propertyKeys.forEach(key -> {
          pathConf.getConfiguration(targetUri, key).ifPresent(conf -> {
            mPrintStream.println(format(key.getName(), conf.get(key)));
          });
        });
      } else if (configuration.getPathConf().containsKey(targetPath)) {
        List<Property> properties = configuration.getPathConf().get(targetPath);
        properties.sort(Comparator.comparing(Property::getName));
        properties.forEach(property -> {
          mPrintStream.println(format(property.getName(), property.getValue()));
        });
      }
      return 0;
    }
  
    @Override
    public String getUsage() {
      return String.format("show [--%s] <path>%n"
          + "\t--%s: %s",
          ALL_OPTION_NAME,
          ALL_OPTION_NAME, ALL_OPTION.getDescription());
    }
  
    /**
     * @return command's description
     */
    @VisibleForTesting
    public static String description() {
      return "Shows path level configurations.";
    }
  
    @Override
    public String getDescription() {
      return description();
    }
  }
  