br.com.objectos.args.Command Maven / Gradle / Ivy

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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.args;

import java.util.Objects;
import java.util.stream.Stream;

/**
 * @author [email protected] (Marcio Endo)
 */
public class Command extends Part {

  private static final Command EMPTY = new Empty();

  private final String name;

  Command(Part next, String name) {
    super(next);
    this.name = name;
  }

  public static Command empty() {
    return EMPTY;
  }

  @Override
  public String toString() {
    return name;
  }

  @Override
  void acceptOptionMap(OptionMap.Builder optionMap) {
    // noop
  }

  boolean hasName(String name) {
    Objects.requireNonNull(name);
    return this.name.equals(name);
  }

   CommandBuilder matchedSubcommand(Args args, ArgsParser parser) {
    Objects.requireNonNull(parser);
    next.visited();
    return CommandBuilder.matched(parser.parse(args));
  }

  boolean nextSubCommand(String subCommand) {
    Objects.requireNonNull(subCommand);
    return next.subCommand(subCommand);
  }

   CommandBuilder onCommand(Args args, String name, ArgsParser parser) {
    Objects.requireNonNull(parser);
    return hasName(name)
        ? CommandBuilder.matched(parser.parse(args))
        : CommandBuilder.chain(args, this);
  }

   CommandBuilder onCommand(Args args, String name, String subCommand, ArgsParser parser) {
    return hasName(name)
        ? nextSubCommand(subCommand)
            ? matchedSubcommand(args, parser)
            : CommandBuilder.chain(args, this)
        : CommandBuilder.chain(args, this);
  }

  @Override
  Command toCommand() {
    return this;
  }

  @Override
  Stream upgradeIfPossible(Box box) {
    throw new UnsupportedOperationException();
  }

  private static class Empty extends Command {

    public Empty() {
      super(null, null);
    }

    @Override
     CommandBuilder onCommand(Args args, String name, ArgsParser parser) {
      return CommandBuilder.empty(args);
    }

  }

}