content: /*
   * 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.bookkeeper.tools.framework;
  
  import com.google.common.base.Strings;
  
  /**
   * A command group that group commands together. They share same global flags.
   */
  public abstract class CliCommandGroup<GlobalFlagsT extends CliFlags>
          extends CliCommand<GlobalFlagsT, GlobalFlagsT> implements CommandGroup<GlobalFlagsT> {
  
      @SuppressWarnings("unchecked")
      private static <GlobalFlagsT extends CliFlags> CliSpec<GlobalFlagsT> updateSpec(CliSpec<GlobalFlagsT> spec) {
          CliSpec<GlobalFlagsT> newSpec;
          if (Strings.isNullOrEmpty(spec.usage())) {
              newSpec = CliSpec.newBuilder(spec)
                  .withUsage(String.format("%s %s [command] [command options]",
                      spec.parent(), spec.name()
                  ))
                  .withFlags(null)
                  .build();
          } else {
              newSpec = CliSpec.newBuilder(spec)
                  .withFlags(null)
                  .build();
          }
  
          String path = newSpec.parent() + " " + newSpec.name();
  
          for (Command<GlobalFlagsT> cmd : newSpec.commands()) {
              if (cmd instanceof CliCommand) {
                  CliCommand<GlobalFlagsT, GlobalFlagsT> cliCmd = (CliCommand<GlobalFlagsT, GlobalFlagsT>) cmd;
                  cliCmd.setParent(path);
              }
          }
  
          return newSpec;
      }
  
      protected CliCommandGroup(CliSpec<GlobalFlagsT> spec) {
          super(updateSpec(spec));
      }
  
      @Override
      public Boolean apply(GlobalFlagsT globalFlags, String[] args) {
          CliSpec<GlobalFlagsT> newSpec = CliSpec.newBuilder(spec)
              .withFlags(globalFlags)
              .setCommandGroup(true)
              .build();
  
          return 0 == Cli.runCli(newSpec, args);
      }
  
      @Override
      public void usage() {
          CliSpec<GlobalFlagsT> newSpec = CliSpec.newBuilder(spec)
              .setCommandGroup(true)
              .build();
  
          // run with "empty args", which will print the usage for this command group.
          Cli.printUsage(newSpec);
      }
  }
  