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Java commandline interface based on Apache commons-cli
There is a newer version: 11.1.8
/*
 * Original copyright by Apache Software Foundation
 * Copyright (C) 2017-2024 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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 com.helger.cli;

import java.util.Iterator;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.helger.commons.ValueEnforcer;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.impl.CommonsArrayList;
import com.helger.commons.collection.impl.ICommonsIterable;
import com.helger.commons.collection.impl.ICommonsList;

/**
 * Manager for {@link IOptionBase} objects which may be {@link Option} or
 * {@link OptionGroup}.
 *
 * @author Philip Helger
 */
public class Options implements ICommonsIterable 
{
  private final ICommonsList  m_aOptions = new CommonsArrayList <> ();

  public Options ()
  {}

  @Nullable
  public Option _getFromName (final String s)
  {
    for (final IOptionBase aOB : m_aOptions)
    {
      if (aOB instanceof Option)
      {
        if (((Option) aOB).matches (s))
          return (Option) aOB;
      }
      else
      {
        for (final Option aOption : (OptionGroup) aOB)
          if (aOption.matches (s))
            return aOption;
      }
    }
    return null;
  }

  @Nonnull
  public Options addOption (@Nonnull final Option.Builder aBuilder)
  {
    return addOption (aBuilder.build ());
  }

  private void _validateOption (@Nonnull final Option aOption)
  {
    ValueEnforcer.notNull (aOption, "Option");
    if (aOption.hasShortOpt ())
      ValueEnforcer.isNull (_getFromName (aOption.getShortOpt ()),
                            () -> "Another option with the short name '" + aOption.getShortOpt () + "' is already contained!");
    if (aOption.hasLongOpt ())
      ValueEnforcer.isNull (_getFromName (aOption.getLongOpt ()),
                            () -> "Another option with the longs name '" + aOption.getLongOpt () + "' is already contained!");
  }

  @Nonnull
  public Options addOption (@Nonnull final Option aOption)
  {
    _validateOption (aOption);
    m_aOptions.add (aOption);
    return this;
  }

  @Nonnull
  public Options addOptionGroup (@Nonnull final OptionGroup aOptionGroup)
  {
    ValueEnforcer.notNull (aOptionGroup, "OptionGroup");
    for (final Option aOption : aOptionGroup)
      _validateOption (aOption);
    m_aOptions.add (aOptionGroup);
    return this;
  }

  @Nonnull
  @ReturnsMutableCopy
  public ICommonsList