java/dagger/example/atm/SingleArgCommand.java

/*
 * Copyright (C) 2019 The Dagger Authors.
 *
 * 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 dagger.example.atm;

import java.util.List;

/** Abstract command that accepts a single argument. */
abstract class SingleArgCommand implements Command {

  @Override
  public final Result handleInput(List<String> input) {
    return input.size() == 1 ? handleArg(input.get(0)) : Result.invalid();
  }

  /** Handles the single argument to the command. */
  protected abstract Result handleArg(String arg);
}