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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) 2004-2015 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
 * "Software"), to deal in the Software without restriction, including
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 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package jdk.internal.joptsimple;

import java.util.List;

Describes options that an option parser recognizes.
Instances of this interface are returned by the "fluent interface" methods to allow retrieval of option arguments
in a type-safe manner.  Here's an example:

    OptionParser parser = new OptionParser();
    OptionSpec<Integer> count =
        parser.accepts( "count" ).withRequiredArg().ofType( Integer.class );
    OptionSet options = parser.parse( "--count", "2" );
    assert options.has( count );
    int countValue = options.valueOf( count );
    assert countValue == count.value( options );
    List<Integer> countValues = options.valuesOf( count );
    assert countValues.equals( count.values( options ) );

Author:
Paul Holser
Type parameters:
<V> – represents the type of the arguments this option accepts/**
 * Describes options that an option parser recognizes.
 *
 * <p>Instances of this interface are returned by the "fluent interface" methods to allow retrieval of option arguments
 * in a type-safe manner.  Here's an example:</p>
 *
 * <pre><code>
 *     OptionParser parser = new OptionParser();
 *     <strong>OptionSpec&lt;Integer&gt;</strong> count =
 *         parser.accepts( "count" ).withRequiredArg().ofType( Integer.class );
 *     OptionSet options = parser.parse( "--count", "2" );
 *     assert options.has( count );
 *     int countValue = options.valueOf( count );
 *     assert countValue == count.value( options );
 *     List&lt;Integer&gt; countValues = options.valuesOf( count );
 *     assert countValues.equals( count.values( options ) );
 * </code></pre>
 *
 * @param <V> represents the type of the arguments this option accepts
 * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>
 */
public interface OptionSpec<V> {
    
Gives any arguments associated with the given option in the given set of detected options.
Specifying a default argument value for this option will cause this method to return that default value even if this option was not detected on the command line, or if this option can take an optional argument but did not have one on the command line.
Params:
detectedOptions – the detected options to search in
Throws:
OptionException – if there is a problem converting this option's arguments to the desired type; for
example, if the type does not implement a correct conversion constructor or method
NullPointerException – if detectedOptions is null
See Also:
OptionSet.valuesOf(OptionSpec<Object>)
Returns:
the arguments associated with this option; an empty list if no such arguments are present, or if this
option was not detected/**
     * Gives any arguments associated with the given option in the given set of detected options.
     *
     * <p>Specifying a {@linkplain ArgumentAcceptingOptionSpec#defaultsTo(Object, Object[]) default argument value}
     * for this option will cause this method to return that default value even if this option was not detected on the
     * command line, or if this option can take an optional argument but did not have one on the command line.</p>
     *
     * @param detectedOptions the detected options to search in
     * @return the arguments associated with this option; an empty list if no such arguments are present, or if this
     * option was not detected
     * @throws OptionException if there is a problem converting this option's arguments to the desired type; for
     * example, if the type does not implement a correct conversion constructor or method
     * @throws NullPointerException if {@code detectedOptions} is {@code null}
     * @see OptionSet#valuesOf(OptionSpec)
     */
    List<V> values( OptionSet detectedOptions );

    
Gives the argument associated with the given option in the given set of detected options.
Specifying a default argument value for this option will cause this method to return that default value even if this option was not detected on the command line, or if this option can take an optional argument but did not have one on the command line.
Params:
detectedOptions – the detected options to search in
Throws:
OptionException – if more than one argument was detected for the option
NullPointerException – if detectedOptions is null
ClassCastException – if the arguments of this option are not of the expected type
See Also:
OptionSet.valueOf(OptionSpec<Object>)
Returns:
the argument of the this option; null if no argument is present, or that option was not detected/**
     * Gives the argument associated with the given option in the given set of detected options.
     *
     * <p>Specifying a {@linkplain ArgumentAcceptingOptionSpec#defaultsTo(Object, Object[]) default argument value}
     * for this option will cause this method to return that default value even if this option was not detected on the
     * command line, or if this option can take an optional argument but did not have one on the command line.</p>
     *
     * @param detectedOptions the detected options to search in
     * @return the argument of the this option; {@code null} if no argument is present, or that option was not detected
     * @throws OptionException if more than one argument was detected for the option
     * @throws NullPointerException if {@code detectedOptions} is {@code null}
     * @throws ClassCastException if the arguments of this option are not of the expected type
     * @see OptionSet#valueOf(OptionSpec)
     */
    V value( OptionSet detectedOptions );

    
Returns:
the string representations of this option/**
     * @return the string representations of this option
     */
    List<String> options();

    
Tells whether this option is designated as a "help" option. The presence of a "help" option on a command line
means that missing "required" options will not cause parsing to fail.
Returns:
whether this option is designated as a "help" option/**
     * Tells whether this option is designated as a "help" option. The presence of a "help" option on a command line
     * means that missing "required" options will not cause parsing to fail.
     *
     * @return whether this option is designated as a "help" option
     */
    boolean isForHelp();
}