joptsimple.OptionSpec Maven / Gradle / Ivy
/*
The MIT License
Copyright (c) 2004-2015 Paul R. Holser, Jr.
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"Software"), to deal in the Software without restriction, including
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*/
package 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 ) );
*
*
* @param represents the type of the arguments this option accepts
* @author Paul Holser
*/
public interface OptionSpec {
/**
* Gives any arguments associated with the given option in the given set of detected options.
*
* 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.
*
* @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 values( OptionSet detectedOptions );
/**
* Gives the argument associated with the given option in the given set of detected options.
*
* 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.
*
* @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 );
/**
* @return the string representations of this option
*/
List 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.
*
* @return whether this option is designated as a "help" option
*/
boolean isForHelp();
}