content: /*******************************************************************************
   * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *    Marc R. Hoffmann - initial API and implementation
   *
   *******************************************************************************/
  package org.jacoco.cli.internal;
  
  import java.util.AbstractList;
  
  import org.jacoco.cli.internal.commands.AllCommands;
  import org.kohsuke.args4j.CmdLineException;
  import org.kohsuke.args4j.CmdLineParser;
  import org.kohsuke.args4j.OptionDef;
  import org.kohsuke.args4j.spi.Messages;
  import org.kohsuke.args4j.spi.OptionHandler;
  import org.kohsuke.args4j.spi.Parameters;
  import org.kohsuke.args4j.spi.Setter;
  
  /**
   * {@link OptionHandler} which uses {@link CommandParser} internally to provide
   * help context also for sub-commands.
   */
  public class CommandHandler extends OptionHandler<Command> {
  
  	/**
  	 * This constructor is required by the args4j framework.
  	 * 
  	 * @param parser
  	 * @param option
  	 * @param setter
  	 */
  	public CommandHandler(final CmdLineParser parser, final OptionDef option,
  			final Setter<Object> setter) {
  		super(parser,
  				new OptionDef(AllCommands.names(), "<command>",
  						option.required(), option.help(), option.hidden(),
  						CommandHandler.class, option.isMultiValued()) {
  				}, setter);
  	}
  
  	@Override
  	public int parseArguments(final Parameters params) throws CmdLineException {
  		final String subCmd = params.getParameter(0);
  
  		for (final Command c : AllCommands.get()) {
  			if (c.name().equals(subCmd)) {
  				parseSubArguments(c, params);
  				setter.addValue(c);
  				return params.size(); // consume all the remaining tokens
  			}
  		}
  
  		throw new CmdLineException(owner,
  				Messages.ILLEGAL_OPERAND.format(option.toString(), subCmd));
  	}
  
  	private void parseSubArguments(final Command c, final Parameters params)
  			throws CmdLineException {
  		final CmdLineParser p = new CommandParser(c);
  		p.parseArgument(new AbstractList<String>() {
  			@Override
  			public String get(final int index) {
  				try {
  					return params.getParameter(index + 1);
  				} catch (final CmdLineException e) {
  					// invalid index was accessed.
  					throw new IndexOutOfBoundsException();
  				}
  			}
  
  			@Override
  			public int size() {
  				return params.size() - 1;
  			}
  		});
  	}
  
  	@Override
  	public String getDefaultMetaVariable() {
  		return "<command>";
  	}
  
  }
  