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A Java library for parsing command line options
There is a newer version: 6.0-alpha-3
package joptsimple;

import java.util.List;

/**
 * Trains the option parser. This interface aids integration that disposes declaration of options but not actual
 * command-line parsing.
 *
 * Typical use is for another class to implement {@code OptionDeclarer} as a facade, forwarding calls to an
 * {@code OptionParser} instance.
 *
 * Note that although this is an interface, the returned values of calls are concrete jopt-simple classes.
 *
 * @author Paul Holser
 * @see OptionParser
 * @since 4.6
 */
public interface OptionDeclarer {
    /**
     * Tells the parser to recognize the given option.
     *
     * This method returns an instance of {@link OptionSpecBuilder} to allow the formation of parser directives
     * as sentences in a fluent interface language. For example:
     *
     * 
     *   OptionDeclarer parser = new OptionParser();
     *   parser.accepts( "c" ).withRequiredArg().ofType( Integer.class );
     * 
     *
     * If no methods are invoked on the returned {@link OptionSpecBuilder}, then the parser treats the option as
     * accepting no argument.
     *
     * @param option the option to recognize
     * @return an object that can be used to flesh out more detail about the option
     * @throws OptionException if the option contains illegal characters
     * @throws NullPointerException if the option is {@code null}
     */
    OptionSpecBuilder accepts( String option );

    /**
     * Tells the parser to recognize the given option.
     *
     * @see #accepts(String)
     * @param option the option to recognize
     * @param description a string that describes the purpose of the option. This is used when generating help
     * information about the parser.
     * @return an object that can be used to flesh out more detail about the option
     * @throws OptionException if the option contains illegal characters
     * @throws NullPointerException if the option is {@code null}
     */
    OptionSpecBuilder accepts( String option, String description );

    /**
     * Tells the parser to recognize the given options, and treat them as synonymous.
     *
     * @see #accepts(String)
     * @param options the options to recognize and treat as synonymous
     * @return an object that can be used to flesh out more detail about the options
     * @throws OptionException if any of the options contain illegal characters
     * @throws NullPointerException if the option list or any of its elements are {@code null}
     */
    OptionSpecBuilder acceptsAll( List options );

    /**
     * Tells the parser to recognize the given options, and treat them as synonymous.
     *
     * @see #acceptsAll(List)
     * @param options the options to recognize and treat as synonymous
     * @param description a string that describes the purpose of the option.  This is used when generating help
     * information about the parser.
     * @return an object that can be used to flesh out more detail about the options
     * @throws OptionException if any of the options contain illegal characters
     * @throws NullPointerException if the option list or any of its elements are {@code null}
     * @throws IllegalArgumentException if the option list is empty
     */
    OptionSpecBuilder acceptsAll( List options, String description );

    /**
     * Gives an object that represents an access point for non-option arguments on a command line.
     *
     * @return an object that can be used to flesh out more detail about the non-option arguments
     */
    NonOptionArgumentSpec nonOptions();

    /**
     * Gives an object that represents an access point for non-option arguments on a command line.
     *
     * @see #nonOptions()
     * @param description a string that describes the purpose of the non-option arguments. This is used when generating
     * help information about the parser.
     * @return an object that can be used to flesh out more detail about the non-option arguments
     */
    NonOptionArgumentSpec nonOptions( String description );

    /**
     * Tells the parser whether or not to behave "POSIX-ly correct"-ly.
     *
     * @param setting {@code true} if the parser should behave "POSIX-ly correct"-ly
     */
    void posixlyCorrect( boolean setting );

    /**
     * Tells the parser to treat unrecognized options as non-option arguments.
     *
     * If not called, then the parser raises an {@link OptionException} when it encounters an unrecognized
     * option.
     */
    void allowsUnrecognizedOptions();

    /**
     * Tells the parser either to recognize or ignore {@code -W}-style long options.
     *
     * @param recognize {@code true} if the parser is to recognize the special style of long options
     */
    void recognizeAlternativeLongOptions( boolean recognize );
}