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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * The MIT License
 *
 * Copyright (c) 2004-2014 Paul R. Holser, Jr.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
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 *
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 * included in all copies or substantial portions of the Software.
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 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package jdk.internal.joptsimple;

import java.util.Collection;
import java.util.List;

Describes options that an option parser recognizes, in ways that might be useful to 
help screens. 
Author:
Paul Holser/**
 * Describes options that an option parser recognizes, in ways that might be useful to {@linkplain HelpFormatter
 * help screens}.
 *
 * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>
 */
public interface OptionDescriptor {
    
A set of options that are mutually synonymous.
Returns:
synonymous options/**
     * A set of options that are mutually synonymous.
     *
     * @return synonymous options
     */
    Collection<String> options();

    
Description of this option's purpose.
Returns:
a description for the option/**
     * Description of this option's purpose.
     *
     * @return a description for the option
     */
    String description();

    
What values will the option take if none are specified on the command line?
Returns:
any default values for the option/**
     * What values will the option take if none are specified on the command line?
     *
     * @return any default values for the option
     */
    List<?> defaultValues();

    
Is this option required on a command line? 
Returns:
whether the option is required/**
     * Is this option {@linkplain ArgumentAcceptingOptionSpec#required() required} on a command line?
     *
     * @return whether the option is required
     */
    boolean isRequired();

    
Does this option accept arguments? 
Returns:
whether the option accepts arguments/**
     * Does this option {@linkplain ArgumentAcceptingOptionSpec accept arguments}?
     *
     * @return whether the option accepts arguments
     */
    boolean acceptsArguments();

    
Does this option require an argument? 
Returns:
whether the option requires an argument/**
     * Does this option {@linkplain OptionSpecBuilder#withRequiredArg() require an argument}?
     *
     * @return whether the option requires an argument
     */
    boolean requiresArgument();

    
Gives a short description of the option's argument. 
Returns:
a description for the option's argument/**
     * Gives a short {@linkplain ArgumentAcceptingOptionSpec#describedAs(String) description} of the option's argument.
     *
     * @return a description for the option's argument
     */
    String argumentDescription();

    
Gives an indication of the expected type of the option's argument. 
Returns:
a description for the option's argument type/**
     * Gives an indication of the {@linkplain ArgumentAcceptingOptionSpec#ofType(Class) expected type} of the option's
     * argument.
     *
     * @return a description for the option's argument type
     */
    String argumentTypeIndicator();

    
Tells whether this object represents the non-option arguments of a command line.
Returns:
true if this represents non-option arguments/**
     * Tells whether this object represents the non-option arguments of a command line.
     *
     * @return {@code true} if this represents non-option arguments
     */
    boolean representsNonOptions();
}