content: /*
   * Copyright (C) 2010 the original author or authors.
   * See the notice.md file distributed with this work for additional
   * information regarding copyright ownership.
   *
   * Licensed 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 io.airlift.airline;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.ImmutableMap;
  import io.airlift.airline.model.ArgumentsMetadata;
  import io.airlift.airline.model.CommandMetadata;
  import io.airlift.airline.model.MetadataLoader;
  import io.airlift.airline.model.OptionMetadata;
  
  import java.util.List;
  
  import static io.airlift.airline.ParserUtil.createInstance;
  import static java.util.Objects.requireNonNull;
  
  public class SingleCommand<C>
  {
      public static <C> SingleCommand<C> singleCommand(Class<C> command)
      {
          return new SingleCommand<C>(command);
      }
  
      private final CommandMetadata commandMetadata;
  
      private SingleCommand(Class<C> command)
      {
          requireNonNull(command, "command is null");
  
          commandMetadata = MetadataLoader.loadCommand(command);
      }
  
      public CommandMetadata getCommandMetadata()
      {
          return commandMetadata;
      }
  
      public C parse(String... args)
      {
          return parse(ImmutableList.copyOf(args));
      }
  
      public C parse(Iterable<String> args)
      {
          requireNonNull(args, "args is null");
  
          Parser parser = new Parser();
          ParseState state = parser.parseCommand(commandMetadata, args);
          validate(state);
  
          CommandMetadata command = state.getCommand();
  
          return createInstance(command.getType(),
                  command.getAllOptions(),
                  state.getParsedOptions(),
                  command.getArguments(),
                  state.getParsedArguments(),
                  command.getMetadataInjections(),
                  ImmutableMap.<Class<?>, Object>of(CommandMetadata.class, commandMetadata),
                  new DefaultCommandFactory<C>());
      }
  
      private void validate(ParseState state)
      {
          CommandMetadata command = state.getCommand();
          if (command == null) {
              List<String> unparsedInput = state.getUnparsedInput();
              if (unparsedInput.isEmpty()) {
                  throw new ParseCommandMissingException();
              }
              else {
                  throw new ParseCommandUnrecognizedException(unparsedInput);
              }
          }
  
          ArgumentsMetadata arguments = command.getArguments();
          if (state.getParsedArguments().isEmpty() && arguments != null && arguments.isRequired()) {
              throw new ParseArgumentsMissingException(arguments.getTitle());
          }
  
          if (!state.getUnparsedInput().isEmpty()) {
              throw new ParseArgumentsUnexpectedException(state.getUnparsedInput());
          }
  
          if (state.getLocation() == Context.OPTION) {
              throw new ParseOptionMissingValueException(state.getCurrentOption().getTitle());
          }
  
          for (OptionMetadata option : command.getAllOptions()) {
              if (option.isRequired() && !state.getParsedOptions().containsKey(option)) {
                  throw new ParseOptionMissingException(option.getOptions().iterator().next());
              }
          }
      }
  }
  