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Command-line argument parser (Example)

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/*
 * Copyright © 2023 Mark Raynsford  https://www.io7m.com
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */


package com.io7m.quarrel.example;

import com.io7m.quarrel.core.QCommandContextType;
import com.io7m.quarrel.core.QCommandMetadata;
import com.io7m.quarrel.core.QCommandStatus;
import com.io7m.quarrel.core.QCommandType;
import com.io7m.quarrel.core.QParameterNamedType;
import com.io7m.quarrel.core.QParametersPositionalAny;
import com.io7m.quarrel.core.QParametersPositionalType;
import com.io7m.quarrel.core.QStringType.QConstant;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;

import static com.io7m.quarrel.core.QCommandStatus.SUCCESS;

/**
 * The meta command.
 */

public final class ExMeta implements QCommandType
{
  /**
   * The meta command.
   */

  public ExMeta()
  {

  }

  @Override
  public List> onListNamedParameters()
  {
    return List.of();
  }

  @Override
  public QParametersPositionalType onListPositionalParameters()
  {
    return new QParametersPositionalAny();
  }

  @Override
  public QCommandStatus onExecute(
    final QCommandContextType context)
    throws Exception
  {
    final var args = context.parametersPositionalRaw();
    if (!args.isEmpty()) {
      switch (args.get(0)) {
        case "converters" -> {
          showConverters(context);
        }
        default -> {

        }
      }
    }

    return SUCCESS;
  }

  private static void showConverters(
    final QCommandContextType context)
  {
    final var w = context.output();
    final var cs = new ArrayList<>(context.valueConverters().converters());
    cs.sort(Comparator.comparing(o -> o.convertedClass().getCanonicalName()));

    for (final var c : cs) {
      w.println(c.convertedClass().getCanonicalName());
    }

    w.flush();
  }

  @Override
  public QCommandMetadata metadata()
  {
    return new QCommandMetadata(
      "meta",
      new QConstant("Display hidden application metadata."),
      Optional.empty()
    );
  }
}